android AlarmManager没有唤醒手机

Question

我想在某个时间显示一个活动.为此,我使用的是AlarmManager.当设备处于唤醒状态时,它可以正常工作,但如果它处于睡眠状态则不会将其唤醒.

我设置闹钟的代码:

Calendar alarmTime = Calendar.getInstance();
alarmTime.set(Calendar.HOUR_OF_DAY, alarm.hour);
alarmTime.set(Calendar.MINUTE, alarm.minute);
alarmTime.set(Calendar.SECOND, 0);

if (alarmTime.before(now))
    alarmTime.add(Calendar.DAY_OF_MONTH, 1);

Intent intent = new Intent(ctxt, AlarmReceiver.class);
intent.putExtra("alarm", alarm);
PendingIntent sender = PendingIntent.getBroadcast(ctxt, alarm.id, intent, PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager.set(AlarmManager.RTC_WAKEUP, alarmTime.getTimeInMillis(), sender);

我的广播接收器:

@Override
public void onReceive(Context context, Intent intent) {
    try {

Bundle bundle = intent.getExtras();
final Alarm alarm = (Alarm) bundle.getSerializable("alarm");

Intent newIntent;
if (alarm.type.equals("regular")) {
    newIntent = new Intent(context, RegularAlarmActivity.class);
} else if (alarm.type.equals("password")) {
    newIntent = new Intent(context, PasswordAlarmActivity.class);
} else if (alarm.type.equals("movement")) {
    newIntent = new Intent(context, MovementAlarmActivity.class);
} else {
    throw new Exception("Unknown alarm type");
}
    newIntent.putExtra("alarm", alarm);
    newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(newIntent);

} catch (Exception e) {
    Toast.makeText(context, "There was an error somewhere, but we still received an alarm", Toast.LENGTH_SHORT).show();
    Log.e("AlarmReceiver", Log.getStackTraceString(e));
}
}

此代码不会唤醒设备.但是,当我再次将其关闭时,它们会显示出来.我需要让他们打开屏幕.你能帮我解决这个问题吗？

Answer 1

我有类似的问题,解决方案是使用WakeLocker.应该这样做(最好是接收器中的第一件事),或者设备会在收到警报时醒来,但之前会再次入睡context.startActivity(newIntent); 叫做.(我还观察到没有发生时的行为,所以看起来有点武断)所以简单快捷的答案:用这个源代码创建一个名为WakeLocker的新类:

package mypackage.test;

import android.content.Context;
import android.os.PowerManager;

public abstract class WakeLocker {
    private static PowerManager.WakeLock wakeLock;

    public static void acquire(Context ctx) {
        if (wakeLock != null) wakeLock.release();

        PowerManager pm = (PowerManager) ctx.getSystemService(Context.POWER_SERVICE);
        wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK |
                PowerManager.ACQUIRE_CAUSES_WAKEUP |
                PowerManager.ON_AFTER_RELEASE, MainActivity.APP_TAG);
        wakeLock.acquire();
    }

    public static void release() {
        if (wakeLock != null) wakeLock.release(); wakeLock = null;
    }
}

并在你的接收器呼叫WakeLocker.acquire(context);作为第一件事.额外的:WakeLocker.release();一旦你的闹钟完成它,它也会很好.

Answer 2

最有可能的是,警报唤醒了设备.但是,AlarmManager广播不会打开屏幕,设备可能会在您的活动开始之前重新入睡.

您需要在呼叫之前获取一个WakeLockin ,并在用户响应您的活动后释放.onReceive()startActivity()WakeLock

Answer 3

对于服务(可能也适用于活动),扩展您的AlarmReceiver WakefulBroadcastReceiver,它会在处理意图时为您获取WAKE_LOCK.

WakefulBroadcastReceiverdocs - https://developer.android.com/reference/android/support/v4/content/WakefulBroadcastReceiver.html

保持设备唤醒指南 - https://developer.android.com/training/scheduling/wakelock.html