android - 将应用程序置于最前面，打开显示并从 AlarmManager 解锁？

Question

当我设置的闹钟激活时，我想打开显示屏、解锁手机并将我的应用程序调到前面。

public class CountDownAlarm extends BroadcastReceiver {

    public CountDownAlarm(){ }

    public CountDownAlarm(Context context, int timeoutInSeconds){
        AlarmManager alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(context, CountDownAlarm.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        Calendar time = Calendar.getInstance();
        time.setTimeInMillis(System.currentTimeMillis());
        time.add(Calendar.SECOND, timeoutInSeconds);
        alarmMgr.set(AlarmManager.RTC_WAKEUP, time.getTimeInMillis(), pendingIntent);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE); 
        WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP, "TRAININGCOUNTDOWN"); 
        wl.acquire(); 
        Intent i = new Intent(context, MyActivity.class); 
        i.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); 
        context.startActivity(i); 
        wl.release(); 
    }
}

我的 CountDownTimer 的振动器已激活，但显示屏没有打开...

public class MyActivity extends Activity implements OnClickListener {

    @Override
    public void onClick(View arg0) {
        timer = new CountDownTimer(countDown*1000, 1000) {
            public void onTick(long millisUntilFinished) {
                activeBtn.setText(String.valueOf(millisUntilFinished / 60000) + ":" + 
                        String.format("%02d", (millisUntilFinished % 60000) / 1000));
            }

            public void onFinish() {
                activeBtn.setText("0:00");
                Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
                v.vibrate(1000);
                ringtone = RingtoneManager.getRingtone(getApplicationContext(),
                        RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));
                if (ringtone != null) {
                    ringtone.play();
                }
                new AlertDialog.Builder(MyActivity.this)
                .setMessage("Time's up!")
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface arg0, int arg1) {
                    }
                }).show();
            }
        }.start();
        new CountDownAlarm(this, countDown);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

附带说明一下，我想播放“阳性”警报声。我该怎么做？

Answer 1

您应该使用 PowerManager.ACQUIRE_CAUSES_WAKEUP 和 PowerManager.FULL_WAKE_LOCK 获取唤醒锁。

WakeLock wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "TRAININGCOUNTDOWN"); 

另请记住，如果您在调用 startActivity() 后立即释放唤醒锁， Activity 可能不会启动，因为它是异步调用。我建议使用 WakefulServiceIntent或 PowerManager.WakeLock.acquire(长时间超时)