Question

到我的listview活动我在adapterView中收到错误unsupportedOperationException现在我对如何修改数组和适配器一无所知，阅读this说我必须修改数组列表但我的活动完全不同结构请提供一些适用于listview的deletind项目或代码解决方案的代码

public class DirMusic extends Activity {
    ListView listSongs;
    ArrayList<Song> songs;
    File musicFolder;
    LinearLayout songsView;
    SimpleAdapter adapter;

    @Override
    public void onCreate(Bundle state) {
        super.onCreate(state);
        setContentView(R.layout.activity_dir_music);

        // get the list of files and place them in ListView
        listSongs = (ListView) this.findViewById(R.id.listSongs);
        songsView = (LinearLayout) this.findViewById(R.id.songsView);   
        final AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
        alertDialog.setTitle("Confirm Delete...");
        alertDialog.setMessage("Are you sure you want delete this?");

        musicFolder = new File("/storage/extSdCard/MUSIC");
//      musicFolder = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
        listSongs.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> view, View item,
                    final int position, long id) {

                // Your method to play here

            }
        });
        bindSongsToListView(musicFolder);
        songsView.setVisibility(View.VISIBLE);  



    listSongs.setOnItemLongClickListener(new OnItemLongClickListener() {

        public boolean onItemLongClick( final AdapterView<?> arg0, View v,
                final int position, long id) {
            // TODO Auto-generated method stub


             AlertDialog.Builder adb=new AlertDialog.Builder(DirMusic.this);
             adb.setTitle("Delete?");
             adb.setMessage("Are you sure you want to delete " + position);
             adb.setNegativeButton("Cancel", null);
             adb.setPositiveButton("Ok", new AlertDialog.OnClickListener() {
                 public void onClick(DialogInterface dialog, int which) {            

                     listSongs.removeViewAt(position);//you can delete your item here

                     adapter.notifyDataSetChanged();

                 }});
             adb.show();

             return true;

             }
         });

}


and logCat 03-04 10:30:43.652: E/AndroidRuntime(14787): FATAL EXCEPTION: main
03-04 10:30:43.652: E/AndroidRuntime(14787): java.lang.UnsupportedOperationException: removeViewAt(int) is not supported in AdapterView
03-04 10:30:43.652: E/AndroidRuntime(14787):    at android.widget.AdapterView.removeViewAt(AdapterView.java:520)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at com.gimi.dirmusic.DirMusic$2$1.onClick(DirMusic.java:136)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:185)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at android.os.Handler.dispatchMessage(Handler.java:99)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at android.os.Looper.loop(Looper.java:137)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at android.app.ActivityThread.main(ActivityThread.java:5419)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at java.lang.reflect.Method.invokeNative(Native Method)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at java.lang.reflect.Method.invoke(Method.java:525)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
03-04 10:30:43.652: E/AndroidRuntime(14787):    at dalvik.system.NativeStart.main(Native Method)
03-04 10:30:44.913: I/Process(14787): Sending signal. PID: 14787 SIG: 9

Answer 1

要删除列表视图的任何元素，您应该删除适配器中数组列表的元素。为此你可以创建一个方法removeItem（position）并从适配器数组中删除item，然后调用notifyDatasetChanged（）。

我希望它会对你有所帮助。

Answer 2

ImageAdapter mImageAdapter;
//...
int pos;
// set pos in range 0 to mImageAdapter.getCount()-1
mImageAdapter.itemList.remove(pos);
mImageAdapter.notifyDataSetChanged();

Answer 3

对于最后一个项目没有被删除的问题，请更换

recyclerView.removeViewAt(position)

与

linearLayoutAdapter.removeViewAt(position)

从listview中删除ViewAt（位置）导致Android中的错误

3 个答案: