android.view.WindowLeaked 警告对话框的错误原因

Question

我是 android 的新手，我对警报对话框有疑问。有这样一种方法：

private void deletSelected(){
    AlertDialog.Builder dialog = new AlertDialog.Builder(this);
    dialog.setTitle("are you sure?");
    dialog.setPositiveButton("Yes" , new DialogInterface.OnClickListener(){
        @Override
        public void onClick(DialogInterface dialog, int which) {
            int deletedRow = getContentResolver().delete(
                    ContentUris.withAppendedId(CONTENT_URI , selectedRow) , null , null);

            if (deletedRow == -1){
                Toast.makeText(EditorActivity.this , "not deleted!" , Toast.LENGTH_SHORT).show();
            }else {
                Toast.makeText(EditorActivity.this , "deleted successfully" , Toast.LENGTH_SHORT).show();
            }
            if (dialog != null){
                dialog.dismiss();
            }    
        }
    });
    dialog.setNegativeButton("no" , new DialogInterface.OnClickListener(){
        @Override
        public void onClick(DialogInterface dialog, int which) {
            if (dialog != null){
                dialog.dismiss();
            }
        }
    });
    // Create and show the AlertDialog
    AlertDialog alertDialog = dialog.create();
    alertDialog.show();
}

还有这样的第二种方法：

 @Override
public boolean onOptionsItemSelected(MenuItem item) {
    // User clicked on a menu option in the app bar overflow menu
    switch (item.getItemId()) {
        // Respond to a click on the "Save" menu option
        case R.id.action_save:
            save();
            finish();
            return true;
        // Respond to a click on the "Delete" menu option
        case R.id.action_delete:
            deletSelected();
            finish(); // if i remove this line app will work correctly
            return true;
    }
    return super.onOptionsItemSelected(item);
}

我的问题是，如果我在 onOptionsItemSelected 方法中删除 finish()，我的应用程序将运行正确，但它仍处于当前 activity，这是我不想要的。我希望用户在确认对话框中按是后删除数据库中的选定行并返回主 activity 但如果没有此行，选定行将删除但应用程序不会返回到 mainActivity 。

如果我添加 finish()，确认对话框会在单击删除后立即消失，应用程序将返回主 activity 而不会删除任何内容。逻辑上显示以下错误：

08-04 21:57:02.630 28064-28064/com.example.android.pets E/WindowManager: android.view.WindowLeaked: Activity com.example.android.pets.EditorActivity has leaked window android.widget.PopupWindow$PopupDecorView{652e345 V.E...... ......ID 0,0-588,144} that was originally added here
                                                                         at android.view.ViewRootImpl.<init>(ViewRootImpl.java:394)
                                                                         at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:330)
                                                                         at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)
                                                                         at android.widget.PopupWindow.invokePopup(PopupWindow.java:1279)
                                                                         at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:1118)
                                                                         at android.support.v7.widget.AppCompatPopupWindow.showAsDropDown(AppCompatPopupWindow.java:105)
                                                                         at android.support.v4.widget.PopupWindowCompatKitKat.showAsDropDown(PopupWindowCompatKitKat.java:33)
                                                                         at android.support.v4.widget.PopupWindowCompat$KitKatPopupWindowImpl.showAsDropDown(PopupWindowCompat.java:129)
                                                                         at android.support.v4.widget.PopupWindowCompat.showAsDropDown(PopupWindowCompat.java:206)
                                                                         at android.support.v7.widget.ListPopupWindow.show(ListPopupWindow.java:721)
                                                                         at android.support.v7.view.menu.StandardMenuPopup.tryShow(StandardMenuPopup.java:160)
                                                                         at android.support.v7.view.menu.StandardMenuPopup.show(StandardMenuPopup.java:187)
                                                                         at android.support.v7.view.menu.MenuPopupHelper.showPopup(MenuPopupHelper.java:290)
                                                                         at android.support.v7.view.menu.MenuPopupHelper.tryShow(MenuPopupHelper.java:175)
                                                                         at android.support.v7.widget.ActionMenuPresenter$OpenOverflowRunnable.run(ActionMenuPresenter.java:803)
                                                                         at android.os.Handler.handleCallback(Handler.java:743)
                                                                         at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                         at android.os.Looper.loop(Looper.java:150)
                                                                         at android.app.ActivityThread.main(ActivityThread.java:5546)
                                                                         at java.lang.reflect.Method.invoke(Native Method)
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
                                                                         at     com.android.internal.os.ZygoteInit.main(ZygoteInit.java:682)
 08-04 21:57:02.631 28064-28064/com.example.android.pets E/WindowManager:      android.view.WindowLeaked: Activity com.example.android.pets.EditorAc

有什么想法吗？

编辑：删除 finish() 并将其放入 onClick 方法后。现在一切都正确了。但是我不明白这两种方式有什么区别？

Answer 1

尝试将要完成的 activity 传递给 deletSelected() 方法，然后从 onClick() 调用 activity.finish()，而不是从 finish() 调用你目前在哪里。

Answer 2

用
替换new AlertDialog.Builder(this) new AlertDialog.Builder(EditorActivity.this); 或使用 getApplicationContext()

Answer 3

发生这种情况是因为当您单击 optionmenuitemselected 时对话框出现后，您正在终止 activity 而没有关闭 AlertDialog。因此，用户无法按他的意愿 select 或按 "yes" 或 "no"。

您需要做的就是将 onBackPressed() 放在警报对话框的肯定按钮或否定按钮中。

private void deletSelected(){
    AlertDialog.Builder dialog = new AlertDialog.Builder(this);
    dialog.setTitle("are you sure?");
    dialog.setPositiveButton("Yes" , new DialogInterface.OnClickListener(){
        @Override
        public void onClick(DialogInterface dialog, int which) {
            int deletedRow = getContentResolver().delete(
                    ContentUris.withAppendedId(CONTENT_URI , selectedRow) , null , null);

            if (deletedRow == -1){
                Toast.makeText(EditorActivity.this , "not deleted!" , Toast.LENGTH_SHORT).show();
            }else {
                Toast.makeText(EditorActivity.this , "deleted successfully" , Toast.LENGTH_SHORT).show();
            }
            if (dialog != null){
                dialog.dismiss();
            }

            **// after performing all you task put this
            onBackPressed();

           // or if you wish to pass some data to previous activity try onActivityResult way.**
        }
    });
    dialog.setNegativeButton("no" , new DialogInterface.OnClickListener(){
        @Override
        public void onClick(DialogInterface dialog, int which) {
            if (dialog != null){
                dialog.dismiss();
            }
        }
    });
    // Create and show the AlertDialog
    AlertDialog alertDialog = dialog.create();
    alertDialog.show();
}

Answer 4

就我而言，使用此解决方案成功完成：使用 dialog.dismiss().

将 "your_activity.this.finish()" 放入空闲时间处理程序中

Handler handler = new Handler();
handler.postDelayed(new Runnable() {
      @Override
      public void run() {
          your_activity.this.finish();
      }
},500);

android.view.WindowLeaked 警告对话框的错误原因

android.view.WindowLeaked error cause of alert dialog

java

android

android-memory