AlarmManager在Oreo及更高版本中关闭应用程序时触发

使用时 AlarmManager PendingIntent s与 Service 被处死的人和被处死的人一样 BroadcastReceiver s、 在android8(Oreo)和更高版本中,只有BroadcastReceivers在应用程序关闭时才执行。

举个例子:

活动

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        long currentTimeMillis = System.currentTimeMillis();
        for (long i = currentTimeMillis; i < currentTimeMillis + 60000; i += 10000) {
            Intent serviceIntent = new Intent(getApplicationContext(), TestService.class);
            PendingIntent servicePendingIntent = PendingIntent.getService(getApplicationContext(), (int) i, serviceIntent, PendingIntent.FLAG_ONE_SHOT);

            Intent receiverIntent = new Intent(getApplicationContext(), TestReceiver.class);
            PendingIntent receiverPendingIntent = PendingIntent.getBroadcast(getApplicationContext(), (int) i, receiverIntent, PendingIntent.FLAG_ONE_SHOT);

            AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
            alarmManager.set(AlarmManager.RTC_WAKEUP, i, servicePendingIntent);
            alarmManager.set(AlarmManager.RTC_WAKEUP, i, receiverPendingIntent);
        }
    }
}

服务

public class TestService extends IntentService {
    public TestService() {
        super("TestService");
    }

    @Override
    protected void onHandleIntent(@Nullable Intent intent) {
        System.out.println("Service");
    }
}

接收器

public class TestReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        System.out.println("Receiver");
    }
}

<service android:name=".TestService" />
<receiver android:name=".TestReceiver" />

I/System.out: Receiver
I/System.out: Service
I/System.out: Receiver
I/System.out: Service
I/System.out: Receiver
I/System.out: Service
*App closed here*
I/System.out: Receiver
I/System.out: Service
I/System.out: Service
I/System.out: Receiver
I/System.out: Receiver
I/System.out: Service

而在奥利奥,这种情况会发生:

I/System.out: Service
I/System.out: Receiver
I/System.out: Service
I/System.out: Receiver
*App closed here*
I/System.out: Receiver
I/System.out: Receiver
I/System.out: Receiver
I/System.out: Receiver

为什么会这样 全局定时器 使用 服务 他在奥利奥的表现和以前不一样吗?