java - 在使用 Job Scheduler API 的作业服务中使用 GoogleApiClient - 缺少回调

Question

我尝试在应用程序关闭时以一定的时间间隔获取位置，为此，我尝试使用 GoogleApiClient 的获取最后已知位置并使用 JobService 触发该位置。我已经在 J​​obScheduler 类上实现了 ConnectionCallbacks。但问题是 onConnected() 回调永远不会被调用。我认为该服务在返回任何回调之前就被销毁了。那么实现这个逻辑的有效方法是什么。

我的工作服务类

public class TestJobService extends JobService
{
protected GoogleApiClient mGoogleApiClient;
protected Location mLastLocation;
protected JobParameters mJobParameters;
public TestJobService() {
    super();
}
private class GetLocation extends AsyncTask<Integer, Void, Integer> implements GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener {
    protected Integer doInBackground(Integer... jobID) {
        if (mGoogleApiClient == null) {
            mGoogleApiClient = new GoogleApiClient.Builder(getBaseContext())
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(LocationServices.API)
                    .build();
        }

        return jobID[0];
    }



    protected void onPostExecute(Integer jobID) {
        Log.i("JobSchedulerTest","Job Finished!");
        jobFinished(mJobParameters, true);
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        mLastLocation=LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        Log.i("JobSchedulerTest", "on start job: " + mJobParameters.getJobId() + "," +
                DateFormat.getTimeInstance().format(new Date())+
                ",Location("+mLastLocation.getLatitude()+","+mLastLocation.getLongitude()+")");

    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }
}


@Override
public boolean onStartJob(JobParameters jobParameters) {
    Log.i("JobSchedulerTest","Job Running!");
    mJobParameters=jobParameters;
    Integer i=new Integer(mJobParameters.getJobId());
    new GetLocation().execute(i);
    return true;

}

@Override
public boolean onStopJob(JobParameters jobParameters) {
    Log.i("JobSchedulerTest","Job Stopped!");
    return true;
}

}

我已在提供这些参数的 Activity 中调用该作业

 private void scheduleJob() {
        ComponentName mServiceComponent = new ComponentName(this, TestJobService.class);
        JobInfo.Builder builder = new JobInfo.Builder(5,mServiceComponent);
        //builder.setMinimumLatency(5 * 1000); // wait at least
        //builder.setOverrideDeadline(50 * 1000); // maximum delay
        builder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY);// require unmetered network
        builder.setBackoffCriteria(5000,JobInfo.BACKOFF_POLICY_LINEAR);
        builder.setRequiresDeviceIdle(false); // we dont care if device should be idle
        builder.setRequiresCharging(false);// we don't care if the device is charging or not
        //builder.setPersisted(true);
        builder.setPeriodic(50*1000);

        JobScheduler jobScheduler = (JobScheduler)getApplication().getSystemService(Context.JOB_SCHEDULER_SERVICE);
        jobScheduler.schedule(builder.build());
    }

有关作业的日志:

04-16 00:48:35.266 10455-10455/com.google.android.gms.location.sample.basiclocationsample I/JobSchedulerTest: Job Running!
04-16 00:48:35.293 10455-10455/com.google.android.gms.location.sample.basiclocationsample I/JobSchedulerTest: Job Finished!
04-16 00:48:37.484 2028-2951/? V/AlarmManager: sending alarm {c169dc type 3 *alarm*:android.content.jobscheduler.JOB_DELAY_EXPIRED}
04-16 00:48:37.550 2028-2028/? V/AlarmManager: done {c169dc, *alarm*:android.content.jobscheduler.JOB_DELAY_EXPIRED} [67ms]
04-16 00:48:37.555 10455-10455/com.google.android.gms.location.sample.basiclocationsample I/JobSchedulerTest: Job Running!
04-16 00:48:37.563 10455-10455/com.google.android.gms.location.sample.basiclocationsample I/JobSchedulerTest: Job Finished!
04-16 00:48:39.927 2028-2951/? V/AlarmManager: sending alarm {c169dc type 3 *alarm*:android.content.jobscheduler.JOB_DELAY_EXPIRED}
04-16 00:48:39.947 2028-2028/? V/AlarmManager: done {c169dc, *alarm*:android.content.jobscheduler.JOB_DELAY_EXPIRED} [23ms]
04-16 00:48:39.952 10455-10455/com.google.android.gms.location.sample.basiclocationsample I/JobSchedulerTest: Job Running!
04-16 00:48:39.957 10455-10455/com.google.android.gms.location.sample.basiclocationsample I/JobSchedulerTest: Job Finished!
04-16 00:48:50.078 2028-2951/? V/AlarmManager: sending alarm {c169dc type 3 *alarm*:android.content.jobscheduler.JOB_DELAY_EXPIRED}
04-16 00:48:50.114 2028-2028/? V/AlarmManager: done {c169dc, *alarm*:android.content.jobscheduler.JOB_DELAY_EXPIRED} [154ms]
04-16 00:48:50.117 10455-10455/com.google.android.gms.location.sample.basiclocationsample I/JobSchedulerTest: Job Running!
04-16 00:48:50.120 10455-10455/com.google.android.gms.location.sample.basiclocationsample I/JobSchedulerTest: Job Finished!

我的 onConnected 实现从未被触发。

Answer 1

您必须在 list 和代码中请求位置权限才能使其正常工作。

list

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

MainActivity 类:

oncreate():

   private static final int MY_PERMISSIONS_REQUEST_FINE_LOCATION = 111;

   if (ContextCompat.checkSelfPermission(MainActivity.this,    // Check for permission
            android.Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(
                this, // Activity
                new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
                MY_PERMISSIONS_REQUEST_FINE_LOCATION);
    }