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android - 应用程序关闭时警报不响（Android Studio）

问题描述

我已经被这个问题困扰了好几天了。我想设置一个闹钟，然后在闹钟响起时发送通知。应用程序打开时运行良好，但应用程序关闭时也应该运行。

这是代码：

安卓清单：

<receiver android:name=".note.AlertReceiver"
            android:enabled="true"
            android:exported="true" ></receiver>
        <service android:name=".note.AlarmNotificationService"
            android:enabled="true"
            android:exported="true" ></service>

警报接收器：

public class AlertReceiver extends BroadcastReceiver {
    @RequiresApi(api = Build.VERSION_CODES.O)
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("done", "done"); 
        Intent serviceIntent = new Intent(context,AlarmNotificationService.class);
        context.startService(serviceIntent);
    }
}

警报通知服务：

public class AlarmNotificationService extends Service {
    
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d("done","done1");

        return START_NOT_STICKY;
    }

主要活动：

@RequiresApi(api = Build.VERSION_CODES.N)
    private void setAlarm(Calendar calendar){
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this , AlertReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this,REQUEST_CODE_alarm,intent,0);
        alarmManager.setExact(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),pendingIntent);
    }

setAlarmTimePicker对话框关闭后触发。我不会添加时间选择器代码，因为它适用于打开的应用程序。

当应用程序关闭时。done不会出现在 logcat 中所以我假设BroadcastReceiver没有收到任何东西

标签： androidalarmmanager

解决方案

我没有使用AlarmManager过，Service因此我很难理解为什么它只在你的情况下在前台工作，但是，我能做的是给你一个在前台/后台执行的工作示例。

从那里您应该能够找出适合您的解决方案。

同样，请记住，我们不会使用Service类。

AndroidManifest.xml

<receiver
  android:name="com.example.name.Receiver"
  android:enabled="true"
  android:exported="true">
   <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
    <action android:name="android.intent.action.LOCKED_BOOT_COMPLETED" />
   </intent-filter>
</receiver>

警报.kt

val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
val intent = Intent(context, Receiver::class.java)

// Used for filtering inside Broadcast receiver
intent.action = "MyBroadcastReceiverAction"
val pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0)

// In this particular example we are going to set it to trigger after 30 seconds.
// You can work with time later when you know this works for sure.
val msUntilTriggerHour: Long = 30000
val alarmTimeAtUTC: Long = System.currentTimeMillis() + msUntilTriggerHour

// Depending on the version of Android use different function for setting an 
// Alarm.
// setAlarmClock() - used for everything lower than Android M
// setExactAndAllowWhileIdle() - used for everything on Android M and higher
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.M) {
  alarmManager.setAlarmClock(
  AlarmManager.AlarmClockInfo(alarmTimeAtUTC, pendingIntent),
  pendingIntent
  )
} else {
  alarmManager.setExactAndAllowWhileIdle(
  AlarmManager.RTC_WAKEUP,
  alarmTimeAtUTC,
  pendingIntent
  )
}

广播接收器.kt

class Receiver : BroadcastReceiver() {
    override fun onReceive(context: Context?, intent: Intent?) {
        // We use this to make sure that we execute code, only when this exact 
        // Alarm triggered our Broadcast receiver
        if (intent?.action == "MyBroadcastReceiverAction") {
           Log.d("ALARM", "RECEIVED")
        }
    }
}

代码在 Kotlin 中，但您在项目中使用它应该没有问题，或者只是重写为 Java。

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