android listview setAdapter（)方法导致闪退-CSDN问答

android listview setAdapter（)方法导致闪退

代码如下，想要实现点击一个checkBox之后，弹出一个dialog，其中用listview来显示带有图标和应用信息的列表，但是运行之后会闪退，提示
listview.setAdapter(browseAppAdapter);
这行代码空指针错误，求解

            checkBox.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (checkBox.isChecked()) {
                    final Dialog dialog = new Dialog(getActivity());
                    dialog.setContentView(R.layout.browse_app_list);
                    dialog.setTitle("应用列表");

                    mlistAppInfo = new ArrayList<AppInfo>();
                    queryAppInfo(); // 查询所有应用程序信息
                    BrowseApplicationInfoAdapter browseAppAdapter = new BrowseApplicationInfoAdapter(
                            getActivity(), mlistAppInfo);   
                    listview.setAdapter(browseAppAdapter);
                    listview.setOnItemClickListener(new OnItemClickListener(){
                        @Override
                        public void onItemClick(AdapterView<?> arg0, View arg1,
                                int position, long arg3) {
                            // TODO Auto-generated method stub
                            intent = mlistAppInfo.get(position).getIntent();
                        }

                    });
                    dialog.show();
                }
            }
        });

编辑于：2016.02.10 08:26 发布于：2016.02.08 10:25

android

| 评论0 | 收藏 | 浏览3602 |

: _Endless_

声望： 4

5个回答

按赞数排序

listview实例化了吗？

发布于：2016.02.10 00:50

评论 5 |

| 已采纳

: leobert_lan

声望： 141

: leobert_lan 回复_Endless_: 实在抱歉啊，前一阵子一直没上网。。解决了就好啦; 4 年多之前回复

: _Endless_ 你好，具体代码发在下面了，你可以看看，谢谢帮助！; 4 年多之前回复

: _Endless_ listview = (ListView) view.findViewById(R.id.listviewApp);; 4 年多之前回复

: _Endless_ 实例化了啊; 4 年多之前回复

: _Endless_ 实例化了啊; 4 年多之前回复

http://blog.csdn.net/superjunjin/article/details/7675724

发布于：2016.02.08 22:50

评论 0 |

: 见了你女王大人喵姐还不跪下

声望： 110397

listview之前的代码那？

发布于：2016.02.09 15:59

评论 2 |

: 東尼傑倫

声望： 0

: _Endless_ 就是做了一个在viewpager中的fragment，里面有一个checkbox，在选择之后会弹出一个dialog，里面显示了所有的应用信息; 4 年多之前回复

: _Endless_ 我发在下面你可以看看; 4 年多之前回复



 package com.example.gesture;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import com.example.gesture.R;
import com.example.gesture.ShakeDetector.OnShakeListener;

import android.app.Dialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ListView;
import android.widget.CompoundButton.OnCheckedChangeListener;

public class MainTab01 extends Fragment {
    ShakeDetector mShakeDetector1;
    private CheckBox checkBox;
    private ListView listview = null;
    private List<AppInfo> mlistAppInfo = null;
    private Intent intent;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.main_tab_01, container, false);
        checkBox = (CheckBox) view.findViewById(R.id.checkBox1);
        listview = (ListView) view.findViewById(R.id.listviewApp);
        final ShakeDetector mShakeDetector = new ShakeDetector(
                this.getActivity());
        OnShakeListener shake = new OnShakeListener() {
            @Override
            public void onShake() {
                startActivity(intent);
            }

        };
        mShakeDetector.registerOnShakeListener(shake);
        checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton arg0, boolean ischecked) {
                // TODO Auto-generated method stub
                if (ischecked) {
                    mShakeDetector.start();

                } else {
                    mShakeDetector.stop();
                }
            }
        });
        checkBox.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (checkBox.isChecked()) {
                    createDialog();
                }
            }
        });
        return view;
    }

    public void createDialog() {
        final Dialog dialog = new Dialog(this.getActivity());
        dialog.setContentView(R.layout.browse_app_list);
        dialog.setTitle("应用列表");
        mlistAppInfo = new ArrayList<AppInfo>();
        queryAppInfo(); // 查询所有应用程序信息
        BrowseApplicationInfoAdapter browseAppAdapter = new BrowseApplicationInfoAdapter(
                this.getActivity(), mlistAppInfo);
        listview.setAdapter(browseAppAdapter);
        listview.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1,
                    int position, long arg3) {
                // TODO Auto-generated method stub
                intent = mlistAppInfo.get(position).getIntent();
            }

        });
        dialog.show();
    }

    public void queryAppInfo() {
        PackageManager pm = this.getActivity().getPackageManager(); // 获得PackageManager对象
        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> resolveInfos = pm.queryIntentActivities(mainIntent,
                PackageManager.MATCH_DEFAULT_ONLY);
        Collections.sort(resolveInfos,
                new ResolveInfo.DisplayNameComparator(pm));
        if (mlistAppInfo != null) {
            mlistAppInfo.clear();
            for (ResolveInfo reInfo : resolveInfos) {
                String activityName = reInfo.activityInfo.name; // 获得该应用程序的启动Activity的name
                String pkgName = reInfo.activityInfo.packageName; // 获得应用程序的包名
                String appLabel = (String) reInfo.loadLabel(pm); // 获得应用程序的Label
                Drawable icon = reInfo.loadIcon(pm); // 获得应用程序图标
                // 为应用程序的启动Activity 准备Intent
                Intent launchIntent = new Intent();
                launchIntent.setComponent(new ComponentName(pkgName,
                        activityName));
                // 创建一个AppInfo对象，并赋值
                AppInfo appInfo = new AppInfo();
                appInfo.setAppLabel(appLabel);
                appInfo.setPkgName(pkgName);
                appInfo.setAppIcon(icon);
                appInfo.setIntent(launchIntent);
                mlistAppInfo.add(appInfo); // 添加至列表中
                System.out.println(appLabel + " activityName---" + activityName
                        + " pkgName---" + pkgName);
            }
        }
    }
}

发布于：2016.02.10 06:16

评论 0 |

: _Endless_

声望： 4

不好意思，解决了，确实是空指针的问题

发布于：2016.02.10 08:25

评论 0 |

: _Endless_

声望： 4

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androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869) at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824) at androidx.fragment.app.FragmentManagerImpl.execSingleAction(FragmentManagerImpl.java:1696) at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:299) at androidx.fragment.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:235) at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1244) at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1092) at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1622) at android.view.View.measure(View.java:22002) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6580) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514) at android.widget.LinearLayout.measureVertical(LinearLayout.java:806) at android.widget.LinearLayout.onMeasure(LinearLayout.java:685) at android.view.View.measure(View.java:22002) at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715) at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) at android.view.View.measure(View.java:22002) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6580) at android.widget.FrameLayout.onMeasure(FrameLayout.java:185) at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143) at android.view.View.measure(View.java:22002) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6580) at androidx.appcompat.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:403) at android.view.View.measure(View.java:22002) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6580) at android.widget.FrameLayout.onMeasure(FrameLayout.java:185) at android.view.View.measure(View.java:22002) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6580) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514) at android.widget.LinearLayout.measureVertical(LinearLayout.java:806) at android.widget.LinearLayout.onMeasure(LinearLayout.java:685) at android.view.View.measure(View.java:22002) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6580) at android.widget.FrameLayout.onMeasure(FrameLayout.java:185) at com.android.internal.policy.DecorView.onMeasure(DecorView.java:721) at android.view.View.measure(View.java:22002) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2410) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1498) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1751) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1386) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6733) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911) at android.view.Choreographer.doCallbacks(Choreographer.java:723) at android.view.Choreographer.doFrame(Choreographer.java:658) <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/textView5" android:layout_width="358dp" android:layout_height="wrap_content" android:text="状态详情" android:textColor="#000000" android:textSize="20sp" android:textStyle="bold" /> <TextView android:id="@+id/textView2" android:layout_width="match_parent" android:layout_height="176dp" android:text="TextView" /> <TextView android:id="@+id/textView3" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="部件信息" android:textColor="#000000" android:textSize="20sp" android:textStyle="bold" /> <TextView android:id="@+id/textView6" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="温度传感器" android:textColor="#2196F3" android:textSize="18sp" android:textStyle="bold" /> <ListView android:id="@+id/lv" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> public class Fragment_Device extends Fragment { private List<Info> infos = new ArrayList<>(); private ListView device_info=null; public Fragment_Device(){ } public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.activity_device, container, false); initInfo(); return view; } public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); initInfo(); } private void initInfo() { Info dev_1 = new Info("室内环境监控", "20摄氏度", "100小时", "2019-05-01 09:00:00"); infos.add(dev_1); Info dev_2 = new Info("室内环境监控", "25摄氏度", "100小时", "2019-05-01 09:08:00"); infos.add(dev_2); Info dev_3 = new Info("室内环境监控", "23摄氏度", "100小时", "2019-05-01 10:00:00"); infos.add(dev_3); Info dev_4 = new Info("室内环境监控", "28摄氏度", "100小时", "2019-05-01 10:30:00"); infos.add(dev_4); InfoAdapter infoAdapter = new InfoAdapter(infos,getContext()); View view = LayoutInflater.from(getContext()).inflate(R.layout.list_item,null); infos=view.findViewById(R.id.lv); device_info = view.findViewById(R.id.lv); device_info.setAdapter(infoAdapter); } }

fragment中自定义listFragment不显示，程序闪退: fragment中自定义listFragment不显示，程序闪退这是fragment的代码： package com.example.date4_23; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.zip.Inflater; import android.support.v4.app.ListFragment; import android.content.Context; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class fragment1 extends ListFragment { private List<Map<String, Object>> data; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.fragment1, container, false); Log.v("huahua", "fragment1-->onCreateView()"); // ViewGroup p = (ViewGroup) mMainView.getParent(); // if (p != null) { // p.removeAllViewsInLayout(); // Log.v("huahua", "fragment1-->移除已存在的View"); // } return v; } @Override public void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); data = getDate(); Myadapter adapter = new Myadapter(getActivity()); setListAdapter(adapter); Log.v("huahua", "fragment1-->onCreate()"); } private List<Map<String, Object>> getDate() { List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(); Map<String, Object> map = new HashMap<String, Object>(); map.put("img", "img1"); map.put("title", "No.1"); map.put("info", "This is raw No.1"); list.add(map); map = new HashMap<String, Object>(); map.put("img", "img2"); map.put("title", "No.2"); map.put("info", "This is raw No.2"); list.add(map); return list; } static class ViewHolder{ public ImageView img; public TextView title; public TextView info; } public class Myadapter extends BaseAdapter{ private LayoutInflater mInflater = null; private Myadapter(Context context){ this.mInflater = LayoutInflater.from(context); } @Override public int getCount() { // TODO Auto-generated method stub return data.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return data.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { Log.v("getView", "===========================getView================="); ViewHolder holder = null; holder = new ViewHolder(); if(convertView == null) { convertView = mInflater.inflate(R.layout.list_item, null); holder.img = (ImageView)convertView.findViewById(R.id.img); holder.title = (TextView)convertView.findViewById(R.id.title); holder.info = (TextView)convertView.findViewById(R.id.info); convertView.setTag(holder); }else { holder = (ViewHolder)convertView.getTag(); } holder.title.setText((String)data.get(position).get("title")); holder.info.setText((String)data.get(position).get("info")); holder.img.setBackgroundResource((Integer)data.get(position).get("img")); return convertView; } } } 这是布局文件： fragment1.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ffffff" android:orientation="vertical" > <ListView android:id="@+id/android:list" android:layout_width="fill_parent" android:layout_height="wrap_content" > </ListView> </LinearLayout> item的布局： list_item.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <ImageView android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="5dp" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" /> <TextView android:id="@+id/info" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="14sp" /> </LinearLayout> </LinearLayout> Logcat报错： ![图片说明](https://img-ask.csdn.net/upload/201504/26/1429979468_880634.png) ``` ``` ``` ``` ``` ```

android listview添加出现问题: 我是一枚新手，在写添加listview并对数据库进行增删改查时遇到了问题，添加listview时我想添加一个item可是一添加就添加了好多行，还有插入数据后不能listview没有显示之前插入的值，求大神给看看！这是我的代码： ``` public class DLXMainActivity extends AppCompatActivity { private Toolbar mToolbar; public static EditText mDlxInput1, mDlxInput2;//输入框 public TextView mTitle, mContent, mTime;//显示内容 DatabaseHelper mDatabaseHelper = new DatabaseHelper(this); static List<Comment> mList = new ArrayList<>(); static Comment mComment = new Comment(); MyAdapter mAdapter; ListView mListView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.dlx_task3_dlxmain); initViewValue(); } public void initViewValue() { findViews(); setSupportActionBar(mToolbar); setOnclicklistener(); } //数据库的初始化和按下删除的监听事件 public void setOnclicklistener() { mDatabaseHelper = new DatabaseHelper(this); mAdapter = new MyAdapter(this, mList); mListView.setAdapter(mAdapter); mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { mComment = mList.get(position); int positioncurrent = mComment.getId(); mDatabaseHelper.databaseDelete(positioncurrent); mList.remove(mComment); mAdapter.notifyDataSetChanged(); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.dlx_task3_menu, menu); return super.onCreateOptionsMenu(menu); } public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_add: showDialog_Layout(DLXMainActivity.this); break; } return super.onOptionsItemSelected(item); } //对话框 private void showDialog_Layout(final Context context) { LayoutInflater inflater = LayoutInflater.from(this); final View textEntryView = inflater.inflate(R.layout.dlx_task3_dialoglayout, null); final AlertDialog.Builder builder = new AlertDialog.Builder(context); mDlxInput1 = (EditText) textEntryView.findViewById(R.id.dlx_Input1); mDlxInput2 = (EditText) textEntryView.findViewById(R.id.dlx_Input2); builder.setCancelable(false); builder.setTitle(R.string.dlx_add); builder.setView(textEntryView); builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { setTitle(""); } }); builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { mDatabaseHelper.databaseInsert(); mDatabaseHelper.databaseFind(context); mAdapter.notifyDataSetChanged(); } }); builder.show(); } public void findViews() { mToolbar = (Toolbar) findViewById(R.id.toolbar); mTitle = (TextView) findViewById(R.id.dlx_maintitle); mContent = (TextView) findViewById(R.id.dlx_maincontent); mTime = (TextView) findViewById(R.id.dlx_maintime); mListView = (ListView) findViewById(R.id.dlx_lv); } } public class MyAdapter extends BaseAdapter { public List<Comment> list; public LayoutInflater mInflater = null; Context context; DatabaseHelper mDatabaseHelper = new DatabaseHelper(context); public MyAdapter(Context context, List<Comment> list) { this.mInflater = LayoutInflater.from(context); this.context = context; this.list = list; } //ViewHolder静态类 static class ViewHolder { public TextView title; public TextView content; public TextView time; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } //获取一个在数据集中指定索引的视图来显示数据 public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder = null; //如果缓存convertView为空，则需要创建View if (convertView == null) { holder = new ViewHolder(); //根据自定义的Item布局加载布局 convertView = mInflater.inflate(R.layout.dlx_task3_commentlayout, null); holder.title = (TextView) convertView.findViewById(R.id.dlx_maintitle); holder.content = (TextView) convertView.findViewById(R.id.dlx_maincontent); holder.time = (TextView) convertView.findViewById(R.id.dlx_maintime); //将设置好的布局保存到缓存中，并将其设置在Tag里，以便后面方便取出Tag convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.title.setText(list.get(position).getTitle()); holder.content.setText(list.get(position).getContent()); holder.time.setText(mDatabaseHelper.getTimeShow(context, (list.get(position).getTime()))); return convertView; } } public class DatabaseHelper extends SQLiteOpenHelper { public static final int DATABASE_VERSION = 1; public static final String DATABASE_NAME = "Comment.db"; public static final String TABLE_NAME = " comment"; public long mDatetimecurrent; Context context; public long mDatetime; // TODO: 2016/5/18 public DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL("CREATE TABLE" + TABLE_NAME + "(" + Comment.Commentinter.EVENT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + Comment.Commentinter.EVENT_TITLE + " TEXT NOT NULL, " + Comment.Commentinter.EVENT_CONTENT + " TEXT NOT NULL, " + Comment.Commentinter.EVENT_TIME + " INTEGER NOT NULL);"); } public void databaseInsert() { SQLiteDatabase db = getWritableDatabase(); ContentValues values = new ContentValues(); mDatetime = System.currentTimeMillis(); //开始组装第一条数据 values.put("title", String.valueOf(DLXMainActivity.mDlxInput1.getText())); values.put("content", String.valueOf(DLXMainActivity.mDlxInput2.getText())); values.put("time", mDatetime); db.insert(TABLE_NAME, null, values);//插入第一条数据 db.close(); } /** * 删除数据库元素 * * @param */ public void databaseDelete(int positioncurrent) { SQLiteDatabase db = getWritableDatabase(); String[] args = {String.valueOf(positioncurrent)}; db.delete("comment", Comment.Commentinter.EVENT_ID + "=?", args); db.close(); } /** * 从数据库中取值并放到listview中 * @param context */ public void databaseFind(Context context) { this.context = context; SQLiteDatabase db = getReadableDatabase(); Cursor cursor = db.query(DatabaseHelper.TABLE_NAME,new String[] {Comment.Commentinter.EVENT_ID, Comment.Commentinter.EVENT_TITLE, Comment.Commentinter.EVENT_CONTENT,Comment.Commentinter.EVENT_TIME}, null, null, null, null, null, null); //DLXMainActivity.mList.clear(); while (cursor.moveToNext()) { String title = cursor.getString(cursor.getColumnIndex(Comment.Commentinter.EVENT_TITLE)); String content = cursor.getString(cursor.getColumnIndex(Comment.Commentinter.EVENT_CONTENT)); long time = cursor.getLong(cursor.getColumnIndex(Comment.Commentinter.EVENT_TIME)); int id = cursor.getInt(cursor.getColumnIndex(Comment.Commentinter.EVENT_ID)); DLXMainActivity.mComment.setTitle(title); DLXMainActivity.mComment.setContent(content); DLXMainActivity.mComment.setTime(time); DLXMainActivity.mComment.setId(id); DLXMainActivity.mList.add(DLXMainActivity.mComment); } cursor.close(); db.close(); } public String getTimeShow(Context context, long datetime) { mDatetimecurrent = System.currentTimeMillis(); long time = mDatetimecurrent - datetime; if (time / 1000 != 0) { if (time / 60000 != 0) { if (time / 3600000 != 0) { if (time / 86400000 != 0) { return time / 86400000 + context.getString(R.string.dlx_day1); } else { return time / 3600000 + context.getString(R.string.dlx_hour); } } else { return time / 60000 + context.getString(R.string.dlx_minute); } } else { return time / 1000 + context.getString(R.string.dlx_second); } } else { return context.getString(R.string.dlx_gang); } } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { onCreate(db); } @Override public void onOpen(SQLiteDatabase db) { super.onOpen(db); } ```

Android Studio中listview与viewpager之间的问题: 如何在viewpager中添加listview同时listview的数据是通过网络接口API获取的

在fragment中的listView问题: 在fragment中显示一个自定义listView，但是运行后什么也没显示。 public class Tab1 extends Fragment implements ListView.OnItemClickListener{ private ArrayList<Custom> fetch = new ArrayList<Custom>(); private ContactsAdapter adapter; private ListView lv; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saveInstanceState){ View v = inflater.inflate(R.layout.tab_layout, container, false); Custom one = new Custom("Hoang Ha", "01672286349"); Custom two = new Custom("Ha Link", "03203590176"); fetch.add(one); fetch.add(two); lv =(ListView)v.findViewById(R.id.list); adapter = new ContactsAdapter(getActivity(), fetch); lv.setAdapter(adapter); lv.setOnItemClickListener(this); return v; } public class Custom{ private String contactName; private String contactPhone; public Custom(String st1, String st2){ contactName = st1; contactPhone = st2; } public String getName(){ return contactName; } public String getPhone(){ return contactPhone; } public void setName(String st1){ contactName = st1; } public void setPhone(String st2){ contactPhone = st2; } } @Override public void onItemClick(AdapterView<?> ad, View v, int position, long id) { // TODO Auto-generated method stub } private class ContactsAdapter extends BaseAdapter{ private FragmentActivity activity; private LayoutInflater inflater; private ArrayList<Custom> data; public ContactsAdapter (FragmentActivity a, ArrayList<Custom> d){ activity = a; data = d; inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public int getCount() { // TODO Auto-generated method stub data.size(); return 0; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub View v = convertView; v = inflater.inflate(R.layout.list_row, null); TextView contact_name = (TextView)v.findViewById(R.id.contact_name); TextView phone_number = (TextView)v.findViewById(R.id.phone_number); //final Custom custom = entries.get(position); final Custom custom = data.get(position); contact_name.setText(custom.getName()); phone_number.setText(custom.getPhone()); return v; } } } 这是列表xml代码： <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:background="@color/light_dark" android:padding="5dip" > <TextView android:id="@+id/contact_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/name" android:textColor="@color/white" android:typeface="sans" android:textSize="@dimen/font_medium" android:textStyle="bold"/> <TextView android:id="@+id/phone_number" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/name" android:textColor="@color/white" android:typeface="sans" android:textSize="@dimen/font_small" /> </LinearLayout>

Android socket通讯客户端连不上服务器问题，以及发送消息程序就闪退: 原本以为是线程问题但是好像又不是，实在找不到怎么弄了这是客户端： package com.chiaki.mysocketobject; import android.content.Intent; import android.os.Handler; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.ImageButton; import android.widget.ListView; import android.widget.TextView; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.Socket; import java.util.ArrayList; import java.util.List; public class ChatActivity extends AppCompatActivity implements Runnable{ private static final String HOST = "172.16.2.54"; private static final int PORT = 12345; private MsgAdapter adapter; private ListView msgListView; private List<Msg> msgList=new ArrayList<Msg>(); private ImageButton send; private ImageButton connect; private EditText edit; private TextView ctext; private Socket socket; private BufferedReader in = null; private PrintWriter out = null; private String content = ""; private StringBuilder sb = null; public Handler handler = new Handler() { public void handleMessage(Message msg) { if (msg.what == 0x123) { sb.append(content); ctext.setText(sb.toString()); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_chat); adapter=new MsgAdapter(ChatActivity.this,R.layout.chat_list_view,msgList); ImageButton back = (ImageButton)findViewById(R.id.back); ImageButton voiceButton = (ImageButton)findViewById(R.id.voiceButton); connect = (ImageButton)findViewById(R.id.connectButton); send = (ImageButton)findViewById(R.id.send); edit = (EditText)findViewById(R.id.edit); ctext = (TextView)findViewById(R.id.chattext); msgListView=(ListView)findViewById(R.id.msg_list_view); sb = new StringBuilder(); msgListView.setAdapter(adapter); // 点击按钮实例化Socket对象,与服务端进行连接,获取输入输出流 // 连接服务器,要在子线程中 connect.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { new Thread() { @Override public void run() { super.run(); try { // 创建socket，连接服务器 socket = new Socket(HOST, PORT);//连接服务器 in = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));//接收消息的流对象 out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);//发送消息的流对象 } catch (Exception e) { e.printStackTrace(); } } }.start(); } }); back.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(ChatActivity.this,SocketActivity.class); startActivity(intent); } }); send.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String con=edit.getText().toString(); edit.setText(""); if (socket.isConnected()) { if (!socket.isOutputShutdown()) { out.println(con);//点击按钮发送消息 } } } }); //启动线程，连接服务器，并用死循环守候，接收服务器发送过来的数据 new Thread(ChatActivity.this).start(); } // 重写run方法,在该方法中输入流的读取 public void run() { try { while (true) { //死循环守护，监控服务器发来的消息 if (socket.isConnected()) { //如果服务器没有关闭 if (!socket.isInputShutdown()) { //连接正常 if ((content = in.readLine()) != null) { //如果输入流没有断开 content += "\n"; //读取接收的信息 handler.sendEmptyMessage(0x123); //会发送一个空消息，但是指定了Message的what属性 } } } } } catch (Exception e) { e.printStackTrace(); } } } 这是layout文件主要的控件： <ImageButton //建立连接按钮 android:layout_width="wrap_content" android:layout_height="wrap_content" app:srcCompat="@android:drawable/checkbox_on_background" android:id="@+id/connectButton" android:layout_alignParentStart="true" android:layout_below="@+id/edit" /> <TextView //显示消息 android:text="TextView" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/chattext" /> <ImageButton //编辑消息 android:layout_width="wrap_content" android:layout_height="wrap_content" app:srcCompat="@android:drawable/ic_btn_speak_now" android:id="@+id/voiceButton" android:layout_below="@+id/edit" android:layout_centerHorizontal="true" /> <ImageButton //发送消息 android:layout_width="wrap_content" android:layout_height="40dp" app:srcCompat="@android:drawable/ic_menu_send" android:id="@+id/send" android:backgroundTint="?attr/colorButtonNormal" android:layout_alignParentBottom="true" android:layout_alignParentEnd="true" /> 这是服务端： import java.io.DataInputStream; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; import java.util.ArrayList; import java.util.List; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.io.IOException; import java.net.ServerSocket; import java.net.Socket; public class Server { // 定义相关的参数,端口,存储Socket连接的集合,ServerSocket对象 // 以及线程池 private static final int PORT = 12345; private List<Socket> mList = new ArrayList<Socket>(); private ServerSocket server = null; private ExecutorService myExecutorService = null; public static void main(String[] args) { new Server(); } public Server() { try { server = new ServerSocket(PORT); // 创建线程池 myExecutorService = Executors.newCachedThreadPool(); System.out.println("服务端运行中...\n"); Socket client = null; while (true) { client = server.accept(); mList.add(client); myExecutorService.execute(new Service(client)); } } catch (Exception e) { e.printStackTrace(); } } class Service implements Runnable { private Socket socket; private BufferedReader in = null; private String msg = ""; public Service(Socket socket) { this.socket = socket; try { in = new BufferedReader(new InputStreamReader(socket.getInputStream())); System.out.println("用户:" + this.socket.getInetAddress() + "~加入了聊天室" + "当前在线人数:" + mList.size()); } catch (IOException e) { e.printStackTrace(); } } @Override public void run() { try { while (true) { if ((msg = in.readLine()) != null) { if (msg.equals("bye")) { System.out.println("~~~~~~~~~~~~~"); mList.remove(socket); in.close(); System.out.println("用户:" + socket.getInetAddress() + "退出:" + "当前在线人数:" + mList.size()); socket.close(); break; } else { System.out.println(socket.getInetAddress() + " 说: " + msg); this.sendmsg(); } } } } catch (Exception e) { e.printStackTrace(); } } // 为连接上服务端的每个客户端发送信息 public void sendmsg() { int num = mList.size(); for (int index = 0; index < num; index++) { Socket mSocket = mList.get(index); PrintWriter pout = null; try { pout = new PrintWriter( new BufferedWriter(new OutputStreamWriter(mSocket.getOutputStream(), "UTF-8")), true); pout.println(msg); } catch (IOException e) { e.printStackTrace(); } } } } }

运行到setContentView这里崩溃了: 这是第一行代码里面的一个项目，运行后崩溃: ![图片说明](https://img-ask.csdn.net/upload/201702/12/1486848687_748230.jpg) MainActivity.java ``` package com.example.newsapp; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.Window; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } ``` News.java ``` package com.example.newsapp; public class News { private String title; private String content; public String getTitle() { return title; } public void setTitle(String title) { this.title=title; } public String getContent() { return content; } public void setContent(String content) { this.content=content; } } ``` NewsAdapter.java ``` package com.example.newsapp; import java.util.List; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.TextView; public class NewsAdapter extends ArrayAdapter<News> { private int resourceId; public NewsAdapter(Context context,int textViewResourceId,List<News> objects) { super(context,textViewResourceId,objects); resourceId=textViewResourceId; } @Override public View getView(int position,View convertView,ViewGroup parent) { News news=getItem(position); View view; if (convertView==null) { view=LayoutInflater.from(getContext()).inflate(resourceId,null); } else { view=convertView; } TextView newsTitleText=(TextView)view.findViewById(R.id.news_title); newsTitleText.setText(news.getTitle()); return view; } } ``` NewsContentActivity.java ``` package com.example.newsapp; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.view.Window; public class NewsContentActivity extends FragmentActivity { public static void actionStart(Context context,String newsTitle,String newsContent) { Intent intent=new Intent(context,NewsContentActivity.class ); intent.putExtra("news_title",newsTitle); intent.putExtra("news_content",newsContent); context.startActivity(intent); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.news_content); FragmentManager fragmentManager=getSupportFragmentManager(); String newsTitle=getIntent().getStringExtra("news_title"); String newsContent=getIntent().getStringExtra("news_content"); NewsContentFragment newsContentFragment=(NewsContentFragment)fragmentManager.findFragmentById(R.id.news_content_fragment); newsContentFragment.refresh(newsTitle,newsContent); } } ``` NewsContentFragment.java ``` package com.example.newsapp; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class NewsContentFragment extends Fragment { private View view; @Override public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) { view=inflater.inflate(R.layout.news_content_frag,container,false ); return view; } public void refresh(String newsTitle,String newsContent) { View visibilityLayout=view.findViewById(R.id.visibility_layout); visibilityLayout.setVisibility(View.VISIBLE); TextView newsTitleText=(TextView)view.findViewById(R.id.news_title); TextView newsContentText=(TextView)view.findViewById(R.id.news_content); newsTitleText.setText(newsTitle); newsContentText.setText(newsContent); } } ``` NewsTitleFragment.java ``` package com.example.newsapp; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; public class NewsTitleFragment extends Fragment implements OnItemClickListener { private ListView newsTitleListView; private List<News> newsList; private NewsAdapter adapter; private boolean isTwoPane; @Override public void onAttach(Activity activity) { super.onAttach(activity); newsList=getNews(); adapter=new NewsAdapter(activity,R.layout.news_item,newsList); } @Override public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) { View view=inflater.inflate(R.layout.news_title_frag,container,false ); newsTitleListView=(ListView)view.findViewById(R.id.news_title_list_view); newsTitleListView.setAdapter(adapter); newsTitleListView.setOnItemClickListener(this ); return view; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); if (getActivity().findViewById(R.id.news_content_layout)!=null ) isTwoPane=true; else isTwoPane=false; } @Override public void onItemClick(AdapterView<?> parent,View view,int position,long id) { News news=newsList.get(position); if (isTwoPane) { NewsContentFragment newsContentFragment=(NewsContentFragment)getFragmentManager().findFragmentById(R.id.news_content_fragment); newsContentFragment.refresh(news.getTitle(),news.getContent()); } else { NewsContentActivity.actionStart(getActivity(),news.getTitle(),news.getContent()); } } private List<News> getNews() { List<News> newsList=new ArrayList<News>(); News news1=new News(); news1.setTitle("标题"); news1.setContent("内容"); newsList.add(news1); News news2=new News(); news2.setTitle("日记"); news2.setContent("去旅游"); newsList.add(news2); return newsList; } } ```

为什么我一调用mAdapter.notifyDataSetChanged();就崩溃: public class MyAdapter extends BaseAdapter { private ArrayList<Item> list; //记录和控制选中状态 private static HashMap<Integer,Boolean> isSelected; //上下文 private Context context; //为子项导入布局 private LayoutInflater inflater; public MyAdapter(ArrayList<Item> list,Context context) { this.list = list; this.context = context; inflater = LayoutInflater.from(context); isSelected = new HashMap<Integer, Boolean>(); //初始化状态 initDate(); } private void initDate() { for(int i=0; i<list.size();i++) { getIsSelected().put(i,false); } } @Override public int getCount() { // TODO Auto-generated method stub return list.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return list.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(final int position, View convertview,ViewGroup parent) { ViewHolder holder ; if(convertview == null) { // 获得ViewHolder对象 holder = new ViewHolder(); // 导入布局并赋值给convertview convertview = inflater.inflate(R.layout.item_layout, null); holder.project_name = (TextView) convertview.findViewById(R.id.project_name); holder.project_result = (TextView) convertview.findViewById(R.id.project_result); holder.project_resultval = (TextView) convertview.findViewById(R.id.project_resultval); holder.cbox = (CheckBox) convertview.findViewById(R.id.box); holder.cbox.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { if (isSelected.get(position)) { isSelected.put(position, false); setIsSelected(isSelected); } else { isSelected.put(position, true); setIsSelected(isSelected); } } }); // 为view设置标签 convertview.setTag(holder); } else { holder = (ViewHolder) convertview.getTag(); } holder.project_name.setText(list.get(position).getproject_name()); holder.project_result.setText(list.get(position).getproject_result()); holder.project_resultval.setText(list.get(position).getproject_resultval()); // 根据isSelected来设置checkbox的选中状况 holder.cbox.setChecked(getIsSelected().get(position)); return convertview; } public static HashMap<Integer,Boolean> getIsSelected() { return isSelected; } public static void setIsSelected(HashMap<Integer,Boolean> isSelected) { MyAdapter.isSelected = isSelected; } public final class ViewHolder { public TextView project_name; public TextView project_result; public TextView project_resultval; public CheckBox cbox; } }

android popupwindow dismiss()关闭窗体前的处理事件: pop.setTouchable(true); pop.setBackgroundDrawable(new BitmapDrawable()); // 上面两句代码当点击窗体外部popupwindow自动消失我想让popupwindow消失前执行一段代码，比如改变字体等，那么如何重写dismiss()方法啊？贴出部分源码 public void popup() {// inflater = (LayoutInflater)popupTest.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View listLayout = inflater.inflate(R.layout.listview, null); listView= (ListView) listLayout.findViewById(android.R.id.list); lvButtonAdapter listItemAdapter = new lvButtonAdapter(this,list1, R.layout.item, new String[]{"text1","text2","ItemImage,RelativeLayout"}, new int[]{R.id.text1,R.id.text2,R.id.pup,R.id.re}); listView.setAdapter(listItemAdapter); listView.setFocusable(true); listView.setItemsCanFocus(true); listView.setOnItemClickListener(new OnItemClickListener(){public void onItemClick(AdapterView<?> arg0, View arg1,int arg2, long arg3) { edit1.getText().insert (edit1.getSelectionStart(),list1.get(arg2).get("text1").toString()); pop.dismiss(); }});//光标处插入文字 pop = new PopupWindow(listLayout, LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT); pop.setTouchable(true); pop.setBackgroundDrawable(new BitmapDrawable()); // pop.setFocusable(true); }

android 当在主线程里开启一个新线程程序就崩溃: 我要实现的功能是检索SDcard里的所有txt文件我尝试过很多办法 1 不用线程直接在主线程里检索文件由于有循环且检索时间会超过5秒导致黑屏然后提示未响应 2 我建立一个线程让线程去检索文件当检索完毕后把检索到的文件传递给主类主类再把检索到的文件显示在list上但是当线程一启动程序就崩溃了 3 最后我在主类里添加handler 当子线程检索完毕就sendmessage给主类然后主类把子线程检索到的文件显示在list上但程序还是崩溃我没在子线程里操作UI 好像只要子线程里有循环程序就会崩溃下面我把代码贴出来希望大家能帮帮我解决下这个问题主类的主要代码 enter code here int jishuqi = 0; ProgressDialog progress; jiansuothread thread; Intent intent; int[] leixing_xuanzhe; FileReader file; File fuwenjian; File fuwenjianxia[]; String[] leixing = new String[] {"doc","pdf","xls","txt","jpg","ppt"}; int i = 0; ArrayList<File[]>root = new ArrayList<File[]>(); String xuanxiang [] = new String [] {"向上","编辑","添加","删除"}; int ico [] = new int[] {R.drawable.xinjian,R.drawable.xinjian,R.drawable.xinjian,R.drawable.xinjian}; ListView list; Button xiangshang; Button bianji; Button tianjia; Button shanchu; View v; static ArrayList<File[]>jiansuoroot = new ArrayList<File[]>(); static List<File>jiansuowenjian = new ArrayList<File>(); static File fi; static ArrayList<File>wenjianjia = new ArrayList<File>(); static ArrayList<File>ziwenjian = new ArrayList<File>(); static ArrayList<File[]>ziwenjian1 = new ArrayList<File[]>(); static ArrayList<File[]>rootwenjianjia = new ArrayList<File[]>(); //jiansuowen js = new jiansuowen(); //zixiancheng xiancheng = null; Handler hanlder; Handler handler = null; Handler childhandler = null; boolean jiansuowanbi = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_text); xiancheng = new zixiancheng(); xiancheng.start(); v = (View)findViewById(R.id.view1); intent = this.getIntent(); leixing_xuanzhe = intent.getIntArrayExtra("leixing_xuanzhe"); list = (ListView)findViewById(R.id.fileslist); parse(leixing_xuanzhe); list.setOnItemClickListener(new mylistitemclick()); xiangshang = (Button)findViewById(R.id.wj_xiangshang); bianji = (Button)findViewById(R.id.wj_bianji); tianjia = (Button)findViewById(R.id.wj_tianjia); shanchu = (Button)findViewById(R.id.wj_shanchu); xiangshang.setOnClickListener(new myClick()); bianji.setOnClickListener(new myClick()); tianjia.setOnClickListener(new myClick()); shanchu.setOnClickListener(new myClick()); //thread = new jiansuothread(this); handler = new Handler() { @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub if(msg.what == 111) { progress.cancel(); List<Map<String,Object>>listitems = new ArrayList<Map<String,Object>>(); for(int i= 0;i<jiansuowenjian.size();i++) { Map<String,Object>item = new HashMap<String,Object>(); item.put("icon",R.drawable.file ); item.put("name", jiansuowenjian.get(i).getName()); listitems.add(item); } SimpleAdapter adpter = new SimpleAdapter(TexlisttActivity.this,listitems , R.layout.list, new String[] {"icon","name"}, new int[] {R.id.icon,R.id.listitem}); list.setAdapter(adpter); } } }; }` 子线程的代码 enter code here` class zixiancheng extends Thread { Message msg = null; public void run() { Looper.prepare(); childhandler = new Handler() { @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub if(msg.what == 222) { try { for(int i =0; i<wenjianjia.size();i++) { jinasuo1(wenjianjia.get(i)); } jiansuowanbi = true; msg = handler.obtainMessage(); msg.what = 111; handler.sendMessage(msg); } catch (Exception e) { // TODO: handle exception } } } }; Looper.loop(); } }

《第一行代码》的酷欧天气，点开省列表以后显示的还是省，而不是城市，这是再点一下省就直接闪退: Logcat如下 FATAL EXCEPTION: main Process: com.coolweather.android, PID: 11807 java.lang.IndexOutOfBoundsException: Index: 6, Size: 0 at java.util.ArrayList.get(ArrayList.java:411) at com.coolweather.android.ChooseAreaFragment$1.onItemClick(ChooseAreaFragment.java:76) at android.widget.AdapterView.performItemClick(AdapterView.java:310) at android.widget.AbsListView.performItemClick(AbsListView.java:1165) at android.widget.AbsListView$PerformClick.run(AbsListView.java:3137) at android.widget.AbsListView$3.run(AbsListView.java:4052) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6290) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 代码如下 package com.coolweather.android; import android.app.ProgressDialog; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.coolweather.android.db.City; import com.coolweather.android.db.County; import com.coolweather.android.db.Province; import com.coolweather.android.util.HttpUtil; import com.coolweather.android.util.Utility; import org.litepal.crud.DataSupport; import java.io.IOException; import java.util.ArrayList; import java.util.List; import okhttp3.Call; import okhttp3.Callback; import okhttp3.Response; /** * Created by 王耀祖 on 2017/7/20. */ public class ChooseAreaFragment extends Fragment { public static final int LEVEL_PROVINCE = 0; public static final int LEVEL_CITY = 1; public static final int LEVEL_COUNTY = 2; private ProgressDialog progressDialog; private TextView titleText; private Button backButton; private ListView listView; private ArrayAdapter<String> adapter; private List<String> dataList = new ArrayList<>(); private List<Province> provinceList; private List<City> cityList; private List<County> countyList; private Province selectedProvince; private City selectedCity; private int currentLevel; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.choose_area, container, false); titleText = (TextView) view.findViewById(R.id.title_text); backButton = (Button) view.findViewById(R.id.back_button); listView = (ListView) view.findViewById(R.id.list_view); adapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_list_item_1, dataList); listView.setAdapter(adapter); return view; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if (currentLevel == LEVEL_PROVINCE) { selectedProvince = provinceList.get(position); queryCities(); } else if (currentLevel == LEVEL_CITY) { selectedCity = cityList.get(position); queryCounties(); } } }); backButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if(currentLevel==LEVEL_COUNTY){ queryCities(); } else if(currentLevel==LEVEL_CITY){ queryProvinces(); } } }); queryProvinces(); } private void queryProvinces(){ titleText.setText("中国"); backButton.setVisibility(View.GONE); provinceList= DataSupport.findAll(Province.class); if(provinceList.size()>0){ dataList.clear(); for(Province province:provinceList) dataList.add(province.getProvinceName()); adapter.notifyDataSetChanged(); listView.setSelection(0); currentLevel=LEVEL_PROVINCE; } else{ String address="http://guolin.tech/api/china"; queryFromServer(address,"province"); } } private void queryCities(){ titleText.setText(selectedProvince.getProvinceName()); backButton.setVisibility(View.VISIBLE); cityList=DataSupport.where("provinceid = ?",String.valueOf(selectedProvince .getId())).find(City.class); if(cityList.size()>0) { cityList.clear(); for(City city:cityList) dataList.add(city.getCityName()); adapter.notifyDataSetChanged(); listView.setSelection(0); currentLevel=LEVEL_CITY; } else{ int provinceCode=selectedProvince.getProvinceCode(); String address="http://guolin.tech/api/china/"+provinceCode; queryFromServer(address,"city"); } } private void queryCounties(){ titleText.setText(selectedCity.getCityName()); backButton.setVisibility(View.VISIBLE); countyList=DataSupport.where("cityid = ?",String.valueOf(selectedCity .getId())).find(County.class); if(countyList.size()>0) { countyList.clear(); for(County county:countyList) dataList.add(county.getCountyName()); adapter.notifyDataSetChanged(); listView.setSelection(0); currentLevel=LEVEL_COUNTY; } else{ int provinceCode=selectedProvince.getProvinceCode(); int cityCode=selectedCity.getCityCode(); String address="http://guolin.tech/api/china/"+provinceCode+"/"+cityCode; queryFromServer(address,"county"); } } private void queryFromServer(String address,final String type){ showProgressDialog(); HttpUtil.sendOkHttpRequest(address, new Callback() { @Override public void onFailure(Call call, IOException e) { getActivity().runOnUiThread(new Runnable() { @Override public void run() { closeProgressDialog(); Toast.makeText(getContext(), "加载失败", Toast.LENGTH_SHORT).show(); } }); } @Override public void onResponse(Call call, Response response) throws IOException { String responseText=response.body().string(); boolean result=false; if("province".equals(type)) result= Utility.handleProvinceResponse(responseText); else if("city".equals(type)) result=Utility.handleCityResponse(responseText,selectedProvince.getId()); else if("county".equals(type)) result=Utility.handleCountyResponse(responseText,selectedCity.getId()); if(result){ getActivity().runOnUiThread(new Runnable() { @Override public void run() { closeProgressDialog(); if("province".equals(type)) queryProvinces(); else if("city".equals(type)) queryCities(); else if("county".equals(type)) queryCounties(); } }); } } }); } private void showProgressDialog(){ if(progressDialog==null){ progressDialog=new ProgressDialog(getActivity()); progressDialog.setMessage("正在加载。。。"); progressDialog.setCanceledOnTouchOutside(false); } progressDialog.show(); } private void closeProgressDialog(){ if(progressDialog!=null) progressDialog.dismiss(); } }

当旋转Android屏幕时App自动加载数据: 我打开我的应用时数据会自动加载，我的问题是：当屏幕是垂直的时候应用会从服务器上加载下数据，但当屏幕旋转的时候，它又重新加载数据，在垂直状态又重新加载，旋转也是，一直如此。我应该怎么做才能让它不重新加载数据，希望大家能帮我看看，应该如何处理。程序代码如下： public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.nhabep); new LoadData().execute(); } // Class load data private class LoadData extends AsyncTask<Void, Void, Void> { private ProgressDialog progressDialog; private JSONArray jArray; private String result = null; private InputStream is = null; private StringBuilder sb = null; @Override protected void onPreExecute() { this.progressDialog = ProgressDialog.show(Nhabep.this, "", " Loading..."); } @Override protected void onPostExecute(final Void unused) { this.progressDialog.dismiss(); try { if (flag == false) { Toast.makeText(Nhabep.this, "欢迎使用!!", Toast.LENGTH_SHORT).show(); } else { // listview listview = (ListView) findViewById(R.id.listView1); this.progressDialog.dismiss(); listview.setAdapter(new DataAdapter(Nhabep.this, soban .toArray(new String[soban.size()]), thoigian .toArray(new String[thoigian.size()]))); listview.setOnItemClickListener(new OnItemClickListener() { // listview @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub String soban2 = soban.get(position); String cafesua2 = cafesua.get(position); String cafeda2 = cafeda.get(position); String cafeden2 = cafeden.get(position); String duatuoi2 = duatuoi.get(position); String nuocngot2 = nuocngot.get(position); String cavienchien2 = cavienchien.get(position); String goiga2 = goiga.get(position); String bokho2 = bokho.get(position); String bunbo2 = bunbo.get(position); Intent i = new Intent(Nhabep.this, Show.class); i.putExtra("soban", soban2); i.putExtra("cafesua", cafesua2); i.putExtra("cafeda", cafeda2); i.putExtra("cafeden", cafeden2); i.putExtra("duatuoi", duatuoi2); i.putExtra("nuocngot", nuocngot2); i.putExtra("cavienchien", cavienchien2); i.putExtra("goiga", goiga2); i.putExtra("bokho", bokho2); i.putExtra("bunbo", bunbo2); startActivity(i); } }); Toast.makeText(Nhabep.this, "欢迎使用!!", Toast.LENGTH_SHORT).show(); } } catch (Exception e) { Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show(); } } // server @Override protected Void doInBackground(Void... params) { try { ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost( "http://longvansolution.tk/loadthongtin.php"); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); HttpResponse response = httpclient.execute(httppost); HttpEntity entity = response.getEntity(); is = entity.getContent(); BufferedReader reader = new BufferedReader( new InputStreamReader(is, "iso-8859-1"), 80); sb = new StringBuilder(); sb.append(reader.readLine() + "\n"); String line = "0"; while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } is.close(); result = sb.toString(); if (result.toString().equalsIgnoreCase("null\n")) { flag = false; soban.clear(); thoigian.clear(); cafesua.clear(); cafeda.clear(); cafeden.clear(); duatuoi.clear(); nuocngot.clear(); cavienchien.clear(); goiga.clear(); bokho.clear(); bunbo.clear(); } else { // tin theo Json jArray = new JSONArray(result); if (jArray != null && jArray.length() > 0) { JSONObject json_data = null; soban.clear(); thoigian.clear(); cafesua.clear(); cafeda.clear(); cafeden.clear(); duatuoi.clear(); nuocngot.clear(); cavienchien.clear(); goiga.clear(); bokho.clear(); bunbo.clear(); for (int i = 0; i < jArray.length(); i++) { json_data = jArray.getJSONObject(i); thoigian1 = json_data.getString("date"); soban1 = json_data.getString("ban"); cafesua1 = json_data.getString("cafesua"); cafeda1 = json_data.getString("cafeda"); cafeden1 = json_data.getString("cafeden"); duatuoi1 = json_data.getString("duatuoi"); nuocngot1 = json_data.getString("nuocngot"); cavienchien1 = json_data.getString("cavienchien"); goiga1 = json_data.getString("goiga"); bokho1 = json_data.getString("bokho"); bunbo1 = json_data.getString("bunbo"); thoigian.add(thoigian1); soban.add(soban1); cafesua.add(cafesua1); cafeden.add(cafeden1); cafeda.add(cafeda1); duatuoi.add(duatuoi1); nuocngot.add(nuocngot1); cavienchien.add(cavienchien1); goiga.add(goiga1); bokho.add(bokho1); bunbo.add(bunbo1); } } flag = true; } } catch (Exception e) { // Log.e("log_tag", "Error in http connection" + e.toString()); Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show(); } return null; } }

技术大佬：我去，你写的 switch 语句也太老土了吧: 昨天早上通过远程的方式 review 了两名新来同事的代码，大部分代码都写得很漂亮，严谨的同时注释也很到位，这令我非常满意。但当我看到他们当中有一个人写的 switch 语句时，还是忍不住破口大骂：“我擦，小王，你丫写的 switch 语句也太老土了吧！” 来看看小王写的代码吧，看完不要骂我装逼啊。 private static String createPlayer(PlayerTypes p...

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我说我不会算法，阿里把我挂了。: 不说了，字节跳动也反手把我挂了。

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大三实习生，字节跳动面经分享，已拿Offer: 说实话，自己的算法，我一个不会，太难了吧

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相关热词 c# 局部截图页面 c#实现简单的文件管理器 c# where c# 取文件夹路径 c# 对比当天 c# fir 滤波器 c# 和站队列 c# txt 去空格 c#移除其他类事件 c# 自动截屏

我要提问

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leobert_lan

见了你女王大人喵姐还不跪下

東尼傑倫

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