在Android中,如何在BroadcastReceiver触发之前启动服务?

我有一个 BroadcastReceiver 有时会被触发的类,我也有一个 Service 班我的 课程从我的课堂开始 Application G.class . 我想要我的 服务 广播接收机 班但正如我在书中看到的 LogCat G级 开始,然后结束 广播接收机 上课开始,然后结束 上课开始了。有什么问题?

警报接收器。班

import android.content.BroadcastReceiver;
import android.content.Context; import android.content.Intent;
import com.hadi.android.dm.app.Logger;

public class AlarmReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    Logger.i("receiver started");
    //do something
}

G级

import android.content.Intent;

public class G extends Application {

  @Override
  public void onCreate() {
    super.onCreate();

    Logger.i("G started");
    startService(new Intent(getApplicationContext(), ApplicationService.class));
    Logger.i("G ended");

}

import android.app.Service;
import android.content.Context;
import android.content.Intent;

public class ApplicationService extends Service {

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Logger.i("service started");
        return START_NOT_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Logger.i("service ended");
    }
}

public void schedule(long time) {
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 2, new Intent(context, AlarmReceiver.class), 0);
        android.app.AlarmManager alarmManager = (android.app.AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            alarmManager.setExact(android.app.AlarmManager.RTC_WAKEUP, time, pendingIntent);
        } else {
            alarmManager.set(android.app.AlarmManager.RTC_WAKEUP, time, pendingIntent);
        }
    }

07-09 00:44:00.797 18172-18172/com.hadi.android.dm I/MYAPP: G started
07-09 00:44:00.886 18172-18172/com.hadi.android.dm I/MYAPP: G ended
07-09 00:44:00.888 18172-18172/com.hadi.android.dm I/MYAPP: receiver started
07-09 00:44:00.890 18172-18172/com.hadi.android.dm I/MYAPP: service started