ListView Items 的点击问题

Question

• 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();
          // }
          //
          // };
          //
          // });
      }

• 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>

  


Answer 1

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。&nbsp;SimpleCursorAdapter&nbsp;notes&nbsp;=&nbsp;new&nbsp;SimpleCursorAdapter(this,&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;R.layout.notes_row,&nbsp;c,&nbsp;from,&nbsp;to);&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;notes.setViewBinder(new&nbsp;SimpleCursorAdapter.ViewBinder()&nbsp;{&nbsp; public&nbsp;boolean&nbsp;setViewValue(View&nbsp;view,&nbsp;Cursor&nbsp;cursor,&nbsp;int&nbsp;column)&nbsp; {&nbsp; TextView&nbsp;tv&nbsp;=&nbsp;(TextView)&nbsp;view;&nbsp; view.setTag=cursor.getInt(cursor.getColumnIndex&nbsp;("_id"));&nbsp;//&nbsp;You&nbsp;need&nbsp;to&nbsp;include&nbsp;the&nbsp;_id&nbsp;in&nbsp;the&nbsp;query tv.setText(String.Valueof(cursor.getInt(cursor.getColumnIndex&nbsp;(NotesDbAdapter.KEY_TITLE&nbsp;)))); return&nbsp;true;&nbsp; }&nbsp; }); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lv.setOnItemClickListener(new&nbsp;OnItemClickListener()&nbsp;{&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;void&nbsp;onItemClick(AdapterView<?>&nbsp;parent,&nbsp;View&nbsp;view,&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;position,&nbsp;long&nbsp;id)&nbsp;{&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TextView&nbsp;tv=(TextView)&nbsp;view; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String&nbsp;ID=view.getTag(); &nbsp;&nbsp;&nbsp;&nbsp;//&nbsp;Delete&nbsp;ID&nbsp;from&nbsp;the&nbsp;DB &nbsp;&nbsp;&nbsp;&nbsp;notes.notifyDataSetChanged();&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;});&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;setListAdapter(notes);&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;}&nbsp; }

Answer 2

点击listview的items时，长按事件，出来一个对话框，里面有删除操作。这样可以删除。也可以在每一行里面有个复选框，做删除功能。

Answer 3

做一个按钮然后指向lvwName.Items.Remove(lvwName.SelectedItems[0]);