O_Casper_ne 2013-04-19 05:37 采纳率: 7.7%
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ListView Items 的点击问题

ListView获取信息保存在本地数据库然后再显示信息。我想点击listview的items时删除它们,如何实现?

public class Notepad extends ListActivity {
    public static final int INSERT_ID = Menu.FIRST;
    EditText notes;
    Button add;
    ListView lv;
    String currentDateTimeString = DateFormat.getDateInstance().format(
            new Date());
    private NotesDbAdapter mDbHelper;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.notepad_list);
        mDbHelper = new NotesDbAdapter(this);
        mDbHelper.open();
        fillData();
        Button add = (Button) findViewById(R.id.addNote);
        // ListView lv = (ListView) findViewById(R.id.list);
        add.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                createNote();
            }
        });
        // lv.setOnItemClickListener(new OnItemClickListener() {
        //
        // public void onItemClick(AdapterView<?> parent, View view,
        // int position, long id) {
        // // When clicked, show a toast with the TextView text
        //
        // try {
        // Toast.makeText(getApplicationContext(),
        // ((TextView) view).getText(), Toast.LENGTH_SHORT)
        // .show();
        //
        // } catch (ClassCastException e) {
        // Toast.makeText(getApplicationContext(), "Error",
        // Toast.LENGTH_SHORT).show();
        // }
        //
        // };
        //
        // });
    }
    private void createNote() {
        EditText notes = (EditText) findViewById(R.id.note);
        String noteName = notes.getText().toString();
        Calendar c = Calendar.getInstance();
        int seconds = c.get(Calendar.SECOND);
        int minutes = c.get(Calendar.MINUTE);
        int hour = c.get(Calendar.HOUR);
        mDbHelper.createNote(noteName + " Entered at " + hour + ":" + minutes
                + ":" + seconds, "");
        fillData();
    }
    private void fillData() {
        // Get all of the notes from the database and create the item list
        Cursor c = mDbHelper.fetchAllNotes();
        startManagingCursor(c);
        String[] from = new String[] { NotesDbAdapter.KEY_TITLE };
        int[] to = new int[] { R.id.text1 };
        // Now create an array adapter and set it to display using our row
        SimpleCursorAdapter notes = new SimpleCursorAdapter(this,
                R.layout.notes_row, c, from, to);
        setListAdapter(notes);
    }
}

ListView:

<ListView
        android:id="@id/android:list"
        android:layout_width="wrap_content"
        android:layout_height="402dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/note" >
    </ListView>
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3条回答 默认 最新

  • Baby_Bonnie 2013-04-23 03:00
    关注

    在程序中重写SimpleCursorAdapter.setViewBinder(),使用数据库中的 ID 来设置 ListView 里 Views 的 Tag,删除 setOnItemClickListener() 中数据库的 ID, 并刷新 Adapter。

     SimpleCursorAdapter notes = new SimpleCursorAdapter(this, 
                    R.layout.notes_row, c, from, to); 
        notes.setViewBinder(new SimpleCursorAdapter.ViewBinder() { 
    public boolean setViewValue(View view, Cursor cursor, int column) 
    { 
    TextView tv = (TextView) view; 
    view.setTag=cursor.getInt(cursor.getColumnIndex ("_id")); // You need to include the _id in the query
    tv.setText(String.Valueof(cursor.getInt(cursor.getColumnIndex (NotesDbAdapter.KEY_TITLE ))));
    return true; 
    } 
    });
             lv.setOnItemClickListener(new OnItemClickListener() { 
             public void onItemClick(AdapterView<?> parent, View view, 
             int position, long id) { 
             TextView tv=(TextView) view;
         String ID=view.getTag();
        // Delete ID from the DB
        notes.notifyDataSetChanged(); 
             }; 
             });    
        setListAdapter(notes); 
        } 
    } 
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
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