Android alarmManager.setAlarmClock 崩溃 Android 7

Question

在我设置闹钟的函数中调用alarmmanager.setAlarmClock 时出现崩溃（仅限Android 7）。我不知道这里有什么问题。以及如何解决这个问题 崩溃。

这是调用alarmManager.setAlarmClock时崩溃的函数

fun setBeforeAlert(
        context: Context,
        offset: Long,
        beforeMin: Int,
        pendingIntent: PendingIntent
    ) {
        if (offset - beforeMin * 60 * 1000 > 0) {
            val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                val alarmClockInfo = AlarmManager.AlarmClockInfo((System.currentTimeMillis() + offset) - beforeMin * 60 * 1000, pendingIntent)
                alarmManager.setAlarmClock(alarmClockInfo, pendingIntent)
            }
            else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                alarmManager.setExact(AlarmManager.RTC_WAKEUP, (System.currentTimeMillis() + offset) - beforeMin * 60 * 1000, pendingIntent)
            }
            else {
                alarmManager.set(AlarmManager.RTC_WAKEUP, (System.currentTimeMillis() + offset) - beforeMin * 60 * 1000, pendingIntent)
            }
        }
    }

这是我传递给上述函数的未决意图：

val intent = Intent(context, AlertAlarm::class.java)
        intent.putExtra(Constants.key_alert_alarm_code, reqCode)
        intent.putExtra(Constants.key_alert_type, type)
        intent.putExtra(Constants.key_alert_min, min)
        val pi = PendingIntent.getBroadcast(context, reqCode, intent, PendingIntent.FLAG_UPDATE_CURRENT)

这是我得到的崩溃报告：

java.lang.NullPointerException: Attempt to invoke virtual method 'int com.android.server.AlarmManagerService$Batch.size()' on a null object reference
at android.app.ActivityThread.handleReceiver(ActivityThread.java:3377)
at android.app.ActivityThread.-wrap18(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1800)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:232)
at android.app.ActivityThread.main(ActivityThread.java:6802)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1103)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int com.android.server.AlarmManagerService$Batch.size()' on a null object reference
at android.os.Parcel.readException(Parcel.java:1714)
at android.os.Parcel.readException(Parcel.java:1661)
at android.app.IAlarmManager$Stub$Proxy.set(IAlarmManager.java:246)
at android.app.AlarmManager.setImpl(AlarmManager.java:680)
at android.app.AlarmManager.setAlarmClock(AlarmManager.java:601)
at com.mypackage.util.AlarmUtils.setBeforeAlert(AlarmUtils.kt:42)
at com.com.mypackage.util.AzanUtils.setBeforeAlertAlarms(AzanUtils.kt:358)
at com.com.mypackage.util.AzanUtils.setAlarms(AzanUtils.kt:160)

Answer 1

我们在 OPPO 设备（Android 7）上也遇到了同样的崩溃。如果您查看AlarmManagerService.Batch.class 中的size() 方法，它绝不应该为空。我假设一些制造商已经改变了导致问题的IAlarmManager (AlarmManagerService) 的实现。你对此无能为力。

Answer 2

确保您的alarmManager 不为空，如下所示。

val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
if (alarmManager != null){
  // do your stuff here.
}

Answer 3

您需要确保alarmManager 不为空，即系统允许您使用AlarmService。添加一个简单的空检查并使强制转换可以为空。

    val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as? AlarmManager
    if (alarmManager != null){
        // set alarm using setExact or setAlarmClock
    } else {
        //  failed to get alarm service, show error
    }