Android LocationServices lastKnownPosition

Question

我环顾四周，但找不到解决方案。我试图在 Android 中找到最后一个已知位置，我从谷歌开发人员那里看到了这个，但函数 onConnected() 从未被调用过。另外，如果我把它放在onCreate() 中，Android 的地理定位图标永远不会打开。

该应用使用已使用 FusedLocation 的权限和谷歌服务。

//class implements ConnectionCallbacks, OnConnectionFailedListener
protected void onCreate(Bundle savedInstanceState) {
    [...]
    buildGoogleApiClient();
}

@Override
protected void onStart() {
    super.onStart();
    mGoogleApiClient.connect();
}

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

@Override
public void onConnected(Bundle connectionHint) {
    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
            mGoogleApiClient);
    if (mLastLocation != null) {
        String lat = String.valueOf(mLastLocation.getLatitude()); //it's only for test
        String lng = String.valueOf(mLastLocation.getLongitude());
    }
}

编辑：没关系，休息一天后，该功能运行正常。代码是一样的。我要删除这个问题吗？

Answer 1

您应该使用 FusedLocationProvide api，它在您构建时提供更准确的位置更新。下面是代码 -

@Override
protected void onCreate(Bundle savedInstanceState){
  //put your code here
  ....
  getLocation();
}

private void getLocation(){
   locationRequest = LocationRequest.create();
   locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
   locationRequest.setInterval(LOCATION_INTERVAL);
   locationRequest.setFastestInterval(LOCATION_INTERVAL);
   fusedLocationProviderApi = LocationServices.FusedLocationApi;
   googleApiClient = new GoogleApiClient.Builder(this)
   .addApi(LocationServices.API)
   .addConnectionCallbacks(this)
   .addOnConnectionFailedListener(this)
   .build();
   if (googleApiClient != null) {
      googleApiClient.connect();
   }
}  


 @Override
 public void onConnected(Bundle arg0) {
     fusedLocationProviderApi.requestLocationUpdates(googleApiClient,   locationRequest, this);
  }

 @Override
 public void onLocationChanged(Location location) {
      Toast.makeText(mContext, "location :"+location.getLatitude()+" , "+location.getLongitude(), Toast.LENGTH_SHORT).show();
  }

它一定会起作用的。让我们试试吧。