Question

我正在尝试从列表视图中删除特定行，但我的应用仍在崩溃。

首先，我尝试仅删除项目表单listAdapter，但它崩溃了：

listAdapter.remove(listAdapter.getItem(toDelete));
listAdapter.notifyDataSetChanged();

然后我也尝试直接从listView中删除它，但它也崩溃了：

listView.removeViewAt(toDelete);
listAdapter.notifyDataSetChanged();

toDelete是一个整数变量，其中包含我要点击的行的数字ID。

那我怎么能从listview中删除一个特定的行？

这是完整的代码，如果有人想要的话：

listView.setOnItemLongClickListener(new OnItemLongClickListener(){

        @Override
        public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            deleteAlert.setTitle("Warning");
            deleteAlert.setMessage("Are you sure you want to delete this?");
            toDelete = arg2;
            deleteAlert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    File directory = new File (externalStoragePath + File.separator + "Android/data/com.whizzappseasyvoicenotepad/");
                    File deleteFile = new File (directory, fileNames.get(toDelete) + ".mp3");
                    deleteFile.delete();
                    dialog.dismiss();

                    listView.removeViewAt(toDelete);
                    listAdapter.notifyDataSetChanged();
                    Log.i("TAG", "Deleting file: " + directory + fileNames.get(toDelete) + ".mp3");
                }
            });

扩展“崩溃”部分真的很难。这很简单：只要点击“是”按钮，应用程序就会崩溃。如果它有帮助，这是logcat文件：

08-06 19:05:07.437: E/AndroidRuntime(16257): FATAL EXCEPTION: main
08-06 19:05:07.437: E/AndroidRuntime(16257): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
08-06 19:05:07.437: E/AndroidRuntime(16257):    at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at java.util.ArrayList.get(ArrayList.java:308)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at com.whizzappseasyvoicenotepad.RecordedLibrary$2$1.onClick(RecordedLibrary.java:113)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at android.os.Looper.loop(Looper.java:137)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at android.app.ActivityThread.main(ActivityThread.java:5103)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at java.lang.reflect.Method.invokeNative(Native Method)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at java.lang.reflect.Method.invoke(Method.java:525)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-06 19:05:07.437: E/AndroidRuntime(16257):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

我认为崩溃不是因为删除，而是因为更新。

关键是

listAdapter.notifyDataSetChanged();

你不能在

内完成

public void onClick(DialogInterface dialog, int which)
{
}

因为它在UIThread之外（有些人称之为主线程），所以你只能修改UI线程内的UI。 notifyDataSetChanged()将修改用户界面。

要解决此问题，您可以使用Handler。这样做：

**Handler myHandler = new Handler()
{
   public void handleMessage(android.os.Message msg)
   {
      listAdapter.notifyDataSetChanged();
   }
};**
listView.setOnItemLongClickListener(new OnItemLongClickListener(){

        @Override
        public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            deleteAlert.setTitle("Warning");
            deleteAlert.setMessage("Are you sure you want to delete this?");
            toDelete = arg2;
            deleteAlert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    File directory = new File (externalStoragePath + File.separator + "Android/data/com.whizzappseasyvoicenotepad/");
                    File deleteFile = new File (directory, fileNames.get(toDelete) + ".mp3");
                    deleteFile.delete();
                    dialog.dismiss();

                    listView.removeViewAt(toDelete);
                    **myHandler.sendMessage();**
                    Log.i("TAG", "Deleting file: " + directory + fileNames.get(toDelete) + ".mp3");
                }
            });

Answer 2

我发现了这个问题！这完全是我的错，我是一个浅薄的人。

问题是我在删除行之前调用了dialog.dismiss（）。我只是在onclick的末尾移动了dialog.dismiss（），现在它可以正常工作：）

这是现在的代码：

deleteAlert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    File directory = new File (externalStoragePath + File.separator + "Android/data/com.whizzappseasyvoicenotepad/");
                    File deleteFile = new File (directory, fileNames.get(toDelete) + ".mp3");
                    deleteFile.delete();
                    Log.i("TAG", "Deleting file: " + directory + fileNames.get(toDelete) + ".mp3");

                    listAdapter.remove(listAdapter.getItem(toDelete));
                    listAdapter.notifyDataSetChanged();

                    dialog.dismiss();
                }
            });

从listview中删除特定行？

2 个答案: