使用 JobScheduler API 进行位置更新

Question

下面是我使用 FireBaseJobDispatcher 开始工作的演示代码。

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FirebaseJobDispatcher dispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(this));
        Job job=createJob(dispatcher);
        dispatcher.schedule(job);


    }

    public static Job createJob(FirebaseJobDispatcher dispatcher){
        Job job = dispatcher.newJobBuilder()
                // persist the task across boots
                .setLifetime(Lifetime.FOREVER)
                // Call this service when the criteria are met.
                .setService(ScheduledJobService.class)
                // unique id of the task
                .setTag("LocationJob")
                // We are mentioning that the job is not periodic.
                .setRecurring(true)
                // Run between 30 - 60 seconds from now.
                .setTrigger(Trigger.executionWindow(10,20))
                //Run this job only when the network is avaiable.
                .setConstraints(Constraint.ON_ANY_NETWORK)
                .build();
        return job;
    }
}

以下是演示服务

public class ScheduledJobService extends JobService implements GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener,LocationListener {
    private GoogleApiClient mGoogleApiClient;
    LocationRequest mLocationRequest;

    @Override
    public boolean onStartJob(JobParameters job) {
        Log.d("token","Start Job Called");
        setUpLocationClientIfNeeded();
        mLocationRequest = LocationRequest.create();
        // Use high accuracy
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setInterval(30000);
        return true;
    }

    @Override
    public boolean onStopJob(JobParameters job) {
        Log.d("token","stopped");
        return true;
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        LocationServices.FusedLocationApi.requestLocationUpdates(this.mGoogleApiClient,
                mLocationRequest, this); // This is the changed line.
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

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

    }

    private void setUpLocationClientIfNeeded()
    {
        if(mGoogleApiClient == null)
            buildGoogleApiClient();
    }

    protected synchronized void buildGoogleApiClient() {
        this.mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        this.mGoogleApiClient.connect();
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.d("token",location.getLatitude()+""+location.getLongitude());
    }
}

根据收到的新位置，我正在更新地图中的位置，一旦用户到达目的地位置，我想完成工作，那么一旦用户到达目的地并释放资源，我该如何停止这项工作。

Answer 1

您可以在onLocationChanged(Location location) 中致电jobFinished (JobParameters params, boolean needsReschedule)。类似于以下内容

@Override
public void onLocationChanged(Location location) {
    Log.d("token",location.getLatitude()+""+location.getLongitude());
    if (location.getLatitude() == /*your value here*/ && location.getLongitude() == /*your value here */) {
        jobFinished(null, false);
    }
}

希望这会有所帮助！