我曾经使用fusedlocationapi,直到我知道它已被弃用(请参阅下面的参考资料)。实施起来很简单。正如文档所说,您需要将它与GoogleApiclient结合使用

LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient,
                        locationRequest, this);

我最近在一个教程之后改为fusedlocationproviderclient(参见下面的参考资料),我成功地让fusedlocationproviderclient工作了
教程:https://github.com/codepath/android_guides/wiki/Retrieving-Location-with-LocationServices-API
// new Google API SDK v11 uses getFusedLocationProviderClient(this)
getFusedLocationProviderClient(this).requestLocationUpdates(mLocationRequest, new LocationCallback() {
      @Override
      public void onLocationResult(LocationResult locationResult) {
         // do work here
         onLocationChanged(locationResult.getLastLocation();
      }
    },
    Looper.myLooper());

我遇到的问题是活套线程。即使应用程序在后台,looper线程也会继续运行。我想在应用程序在后台时暂停位置更新,然后在应用程序在前台时恢复位置更新。我怎样才能做到这一点?
参考文献:
https://developers.google.com/android/reference/com/google/android/gms/location/FusedLocationProviderApi
https://developers.google.com/android/reference/com/google/android/gms/location/FusedLocationProviderClient

最佳答案

你只需要在你的活动中调用mFusedLocationClient.removeLocationUpdates(mLocationCallback)。然而,它有一点不止这些。
在主活动中使用fusedlocationproviderclient、googleapiclient和locationrequest的成员变量:

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;

public class MainActivity extends AppCompatActivity
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {

    FusedLocationProviderClient mFusedLocationClient;
    GoogleApiClient mGoogleApiClient;
    LocationRequest mLocationRequest;

    //..........

对locationcallback也使用成员变量:
LocationCallback mLocationCallback = new LocationCallback(){
    @Override
    public void onLocationResult(LocationResult locationResult) {
        for (Location location : locationResult.getLocations()) {
            Log.i("MainActivity", "Location: " + location.getLatitude() + " " + location.getLongitude());

        }
    };

};

然后,在onPause()中指定mFusedLocationClient
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

    //...............
}

然后在onCreate()中,如果设置了GoogleApiclient和FusedLocationProviderClient,则使用它们。否则,这是活动首次启动,因此请连接GoogleApiclient:
@Override
public void onResume() {
    if (mGoogleApiClient != null && mFusedLocationClient != null) {
        requestLocationUpdates();
    } else {
        buildGoogleApiClient();
    }
}

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

@Override
public void onConnected(Bundle bundle) {
    requestLocationUpdates()
}

public void requestLocationUpdates() {
    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(120000); // two minute interval
    mLocationRequest.setFastestInterval(120000);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.ACCESS_FINE_LOCATION)
            == PackageManager.PERMISSION_GRANTED) {
        mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
    }
}

最后,在onResume()中,调用onPause()
@Override
public void onPause() {
    super.onPause();
    if (mFusedLocationClient != null) {
        mFusedLocationClient.removeLocationUpdates(mLocationCallback);
    }
}

07-28 02:39
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