Intent.FLAG_ACTIVITY_FORWARD_RESULT 和 PendingIntent

Question

我想从具有 pendingIntent 的 AlarmManager 启动的 Activity 接收 Intent 实例。

我让 Activity A 通过带有 pendingIntent 的 alarmManager 启动 Activity B，如下所示：

PendingIntent pendingIntent = PendingIntent.getActivity(this, position, intentListAlarmActivityToWakeUpActivity, 0);

    Log.i("position", position +"");
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY, hourAlarm);
    calendar.set(Calendar.MINUTE, minutesAlarm);

    Log.i("timeInMillis", calendar.getTimeInMillis() + "");
    alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);

有这样的意图：

intentListAlarmActivityToWakeUpActivity = new Intent(ListAlarmActivity.this, WakeUpActivity.class);
    intentListAlarmActivityToWakeUpActivity.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP
    | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS | Intent.FLAG_ACTIVITY_FORWARD_RESULT);

但是我不明白当我在我的活动 B 中设置方法 setResult(...) 时，我在我的活动 A 中没有结果... 在我的活动 B 中：

  protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_wake_up);

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON |
                        WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON |
                        WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
        );

        mStopButton = (Button) findViewById(R.id.stop_button);
        mStopButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                int stopAlarm = 1;

                Intent intentResult = new Intent();
                intentResult.putExtra("stopAlarm", stopAlarm);

                setResult(RESULT_OK, intentResult);
                finish();

            }
        });

在 Activity A 的 onActivityResult 方法中：

 @Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {


    if(requestCode == REQUEST_CODE && resultCode == RESULT_OK) {

        Alarm alarm = (Alarm) intent.getSerializableExtra(AlarmAdapter.ALARM_INSTANCE);
        int position = intent.getIntExtra(AlarmAdapter.ITEM_POSITION_ADAPTER, 0);

        setAlarm(alarm.getHourOfAlarm(), alarm.getMinutesOfAlarm(), position);

        mListOfAlarm.get(position).setData(alarm);
        mAlarmAdapter.notifyDataSetChanged();

    }

    else if(requestCode == REQUEST_CODE_WAKE_UP_ACTIVITY && resultCode == RESULT_OK) {

        int stop = intent.getIntExtra("stopAlarm", -1);
        Log.i("stopAlarm", stop +"");

    }

}

标志 Intent.FLAG_ACTIVITY_FORWARD_RESULT 似乎不起作用...

Answer 1

你不能这样使用Intent.FLAG_ACTIVITY_FORWARD_RESULT。由于ActivityB 由AlarmManager 启动，它将忽略FORWARD_RESULT 标志。仅当直接从另一个 Activity 启动 Activity 时，该标志才有效。