java - 对话框打开时检测后退按钮事件

Question

我正在构建一个应用程序，它有两个打开的对话框，我希望如果用户在某些对话框打开时按下后退按钮，就会发生一些事情。但是，由于某种原因，当对话框打开时，后退按钮事件没有注册。我通过在 onBackPressed() 中放入日志来测试它，每当对话未打开并且我只是在主要 Activity 时，日志就会出现在 logcat 上。然而，如果对话是开放的，我只会得到这个:

W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.

下面我放置了对话的代码:

    public void pair() {
        final Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();

        AlertDialog.Builder pairedList = new AlertDialog.Builder(this);
        pairedList.setTitle("Paired Devices");

        final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.select_dialog_singlechoice);
        if (pairedDevices.size() > 0) {
            for (BluetoothDevice device : pairedDevices) {
                arrayAdapter.add(device.getName());
            }
        }

        pairedList.setNegativeButton("cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                mBluetoothAdapter.disable();
//                pair_dialog = false;
            }
        });

        pairedList.setPositiveButton("Pair New", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                startActivityForResult(new Intent(android.provider.Settings.ACTION_BLUETOOTH_SETTINGS), 0);
            }
        });

        pairedList.setAdapter(arrayAdapter, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
//                connect_dialog = true;
                String strName = arrayAdapter.getItem(which);
                AlertDialog.Builder builderInner = new AlertDialog.Builder(MainActivity.this);
                builderInner.setMessage(strName);
                builderInner.setTitle("Connect To:");
                builderInner.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        for (BluetoothDevice device : pairedDevices) {
                            if(device.getName().equals(strName)){
                                paired = device;
                                dialog.dismiss();
                            }
                        }
                    }
                });
                builderInner.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
//                        connect_dialog = false;
                        pairedList.show();
                    }
                });
                builderInner.show();
            }
        });
        pairedList.show();
//        pair_dialog = true;
    }

下面是我的 onBackPressed() 方法，就在上述方法之后。我不认为有什么异常。

   @Override
    public void onBackPressed() {
        Log.e(TAG, "Back Button Pressed");
        super.onBackPressed();
    }

就像我说的，如果对话未打开，日志在 logcat 中显示得很好，但如果对话打开，则就像后退按钮未注册。

Answer 1

这对我有用......

       yuordialog.setOnKeyListener(new Dialog.OnKeyListener() {

            @Override
            public boolean onKey(DialogInterface arg0, int keyCode,
                                 KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_BACK) {
                   //your stuff....
                }
                return true;
            }
        });