这是activity中的代码：
public class News extends AppCompatActivity implements View.OnClickListener {
private ListView listView;
private List<Map<String, Object>> listitem = new ArrayList<Map<String, Object>>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_news);
ImageButton sendRequest = (ImageButton) findViewById(R.id.buttonwddt);
//创建一个simpleAdapter
SimpleAdapter myAdapter = new SimpleAdapter(this, listitem, R.layout.new2, new String[]{"uname", "content"}, new int[]{R.id.item_name, R.id.item_content});
listView = (ListView) findViewById(R.id.list_wddy);
listView.setAdapter(myAdapter);
sendRequest.setOnClickListener(this);
}
//@Override
public void onClick(View v) {
if(v.getId() == R.id.buttonwddt) {
sendRequestWithOkHttp();
}
}
private void sendRequestWithOkHttp() {
//开启线程来发起网络请求
new Thread(new Runnable() {
@Override
public void run() {
//String uid = "1001";
try {
OkHttpClient client = new OkHttpClient();
RequestBody requestBody = new FormBody.Builder()
.add("action","dt")
.add("uid","1001")
.build();
Request request = new Request.Builder()
.url("http://192.168.102.186:8080/ateeth/newsServlet")
.post(requestBody)
.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
String responseData = response.body().string();
System.out.println("1");
System.out.println(responseData);
showResponse(responseData);
/*Gson gson = new Gson();
List<Dynamic> dynamicList = gson.fromJson(responseData, new TypeToken<List<Dynamic>>(){}.getType());
System.out.println(dynamicList);
showResponse(dynamicList);*/
}
});
} catch (Exception e){
e.printStackTrace();
}
}
}).start();
}
private void showResponse(final String response) {
//private void showResponse(final List<Dynamic> dynamicList) {
runOnUiThread(new Runnable() {
@Override
public void run() {
//在这里进行UI操作
Gson gson = new Gson();
List<Dynamic> dynamicList = gson.fromJson(response, new TypeToken<List<Dynamic>>(){}.getType());
System.out.println(dynamicList);
for (int i = 0; i < dynamicList.size(); i++){
HashMap<String, Object> showitem = new HashMap<String, Object>();
showitem.put("uname", dynamicList.get(i).getUname());
showitem.put("content", dynamicList.get(i).getContent());
listitem.add(showitem);
}
System.out.println(listitem);
//创建一个simpleAdapter
SimpleAdapter myAdapter = new SimpleAdapter(getApplicationContext(), listitem, R.layout.new2, new String[]{"uname", "content"}, new int[]{R.id.item_name, R.id.item_content});
listView.setAdapter(myAdapter);
Log.d("刷新","刷新成功");
}
});
}
}
相关的xml文件：
activity_news.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".News">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="#49B0EE">
<ImageButton
android:id="@+id/buttonfh"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_marginTop="50dp"
android:layout_marginLeft="20dp"
android:background="@drawable/fanhui" />
<TextView
android:id="@+id/woxx"
android:textColor="#333333"
android:textStyle="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="115dp"
android:layout_marginTop="50dp"
android:text="我的消息"
android:textSize="20sp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="125dp"
android:background="#ffffff"
android:orientation="horizontal">
<ImageButton
android:id="@+id/buttonwddt"
android:layout_width="60dp"
android:layout_height="80dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="15dp"
android:background="@drawable/wddt" />
<ImageButton
android:id="@+id/buttongz"
android:layout_width="60dp"
android:layout_height="80dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="15dp"
android:background="@drawable/guanzhu" />
<ImageButton
android:id="@+id/buttonz"
android:layout_width="60dp"
android:layout_height="80dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="15dp"
android:background="@drawable/zan" />
<ImageButton
android:id="@+id/buttonpl"
android:layout_width="60dp"
android:layout_height="80dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="15dp"
android:background="@drawable/pinglun" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#E6E6E6"
android:orientation="vertical">
<LinearLayout
android:layout_width="380dp"
android:layout_height="match_parent"
android:background="#ffffff"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
android:orientation="vertical">
<ListView
android:id="@+id/list_wddy"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
news2.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<!--用于显示每一条自己的动态消息-->
<TextView
android:id="@+id/item_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/item_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
这是android studio运行的截图：
在代码中把相关数据打印了，感觉数据没啥问题。
但是列表就是一点都显示不出来。
纠结了一天，不知道该怎样改。
