当应用程序在后台被杀死且设备被锁定时，警报管理器将无法工作

Question

卡在这个状态很久了...

我想使用闹钟管理器在特定时间显示通知，现在它在下面列出的情况下工作：

当应用程序在后台运行时，无论设备是否锁定，都会在正确的时间显示通知。
应用程序在后台被杀死后，设备未锁定时我仍然会收到正确的通知，但是当设备锁定时情况就不对了，我无法收到任何通知。

这是代码 AlarmReceiver.java，所有需要的权限已添加到 AndroidManifest.xml 中：

@Override
public void onReceive(Context context, Intent intent) {
    WakeLocker.acquire(context);

    String action = intent.getAction();

    Log.d(TAG, action); //when app is killed and device is locked, no info is shown at the logcat

    if (ACTION_ALARM.equals(action)) {
        Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        vibrator.vibrate(2 * 1000);

        notify(context, "Jello!");
    }

    WakeLocker.release();
}

public static void alarm(Context context) {
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    Intent intent = new Intent(context, AlarmReceiver.class);
    intent.setAction(ACTION_ALARM);
    PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent, 0);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        alarmManager.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + 5 * 1000, pi);
    } else {
        alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + 5 * 1000, pi);
    }
}

private void notify(Context context, String msg) {
    NotificationManager notificationManager = (NotificationManager)
            context.getSystemService(Context.NOTIFICATION_SERVICE);

    PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
            new Intent(context, InfoActivity.class), 0);

    Notification notification =
            new NotificationCompat.Builder(context)
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setContentTitle(context.getString(R.string.alarm))
                    .setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
                    .setContentText(msg)
                    .setAutoCancel(true)
                    .setContentIntent(contentIntent).build();

    notificationManager.notify(1, notification);
}

添加的权限：

<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.VIBRATE"/>

Answer 1

有一天我遇到了类似的问题，并在网上找到了一个解决方案，即在调用 broadcastreceiver 时唤醒 phone。因此，请尝试创建此 class，并在调用广播接收器时调用 MyWakeLock.acquire()。当你完成你的警报时，你也应该调用 MyWakeLock.release()。

package your.package.name;

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

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

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

        PowerManager pm = (PowerManager) c.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;
    }
}

Answer 2

我刚刚找到解决方案，将名为 FLAG_INCLUDE_STOPPED_PACKAGES 的标志设置为警报的意图，事情就会顺利进行。这是Android Developers

中的插图

Answer 3

我遇到了这个问题，最后发现错误的targetSdkVersion is above 22 and no handle permission。设置 targetSdkVersion 22 并工作 ^_^

当应用程序在后台被杀死且设备被锁定时，警报管理器将无法工作

Alarm Manager won't work when the app is killed in the background and device is locked

android

alarmmanager

wakelock