Question

我尝试使用互联网获取用户的坐标（但没有GPS）

清单：

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

在onCreate()方法中，我发起了client：

if (client == null) {
        client = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

According to `developer.android.com`'s docs:

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

@Override
protected void onStop() {
    client.disconnect();
    super.onStop();
}

onConnected：

 @Override
public void onConnected(@Nullable Bundle bundle) {
    System.out.println("connected");
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    location = LocationServices.FusedLocationApi.getLastLocation(client);
    if (location != null) {
       System.out.println("location " + location.getLatitude());
    } else {
        System.out.println("location " + "empty");
    }
}

因此，当我的GPS打开时，我可以看到日志中的坐标，但是当我尝试通过互联网（3g或Wi-Fi并不重要）时，我的Location是{ {1}}。

我错过了什么？也许我走错了路？

P.S。尝试使用null进行相同的操作会产生相同的结果。

Answer 1

试试这个

首先像这样定义LocationRequest对象

   LocationRequest mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(INTERVAL);
    mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

然后在onConnected（）里面添加这个

  LocationServices.FusedLocationApi.requestLocationUpdates(
        mGoogleApiClient, mLocationRequest, this);

然后覆盖onLocationChanged（）方法

@Override
public void onLocationChanged(Location location) {
    //Here you can use location.getLatitude() etc
}

GoogleApiClient getLastLocation在没有GPS的情况下返回null

1 个答案: