Android 获取位置失败

Question

我正在尝试获取虚拟设备的位置 AVD 这里的问题是位置 return by null ，我已经向应用程序添加了权限，但仍然无法获取位置

public class MainActivity extends AppCompatActivity implements LocationListener {
LocationManager locationManager;
String provider;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

    provider = locationManager.getBestProvider(new Criteria(), false);

    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.

        Log.i("Location Info","Permission Denied");
        return;
    }
    Location location = locationManager.getLastKnownLocation(provider);
    if (location != null) {
        Log.i("Location Info","Location Achieved ");

    } else {

        Log.i("Location Info", "Location Failed");
    }

}

@Override
protected void onResume() {
    super.onResume();
    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;
    }
    locationManager.requestLocationUpdates(provider, 400, 1, this);
}

@Override
protected void onPause() {
    super.onPause();
    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;
    }
    locationManager.removeUpdates(this);
}

@Override
public void onLocationChanged(Location location) {
      Double longitude = location.getLongitude();
      Double latitude = location.getLatitude();
      Log.i("location Info Lat",longitude.toString());
      Log.i("Location Info long",longitude.toString());
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}

结果一直是 log info :Location Failed ，这种情况下如何解决

Answer 1

模拟器上的位置是 null，因为它不知道您上次发送的位置（新开始或其他）。您需要将坐标发送到模拟器。在真实设备上测试时效果更好。

编辑：

像这样输入坐标 image。

Answer 2

这里的问题正如@Florescu 所提到的，当我第一次给仿真器尺寸时，它从未知状态开始，发现仿真器理解这是一个运动但是当我再次运行它时它给了我正确的行为

Android 获取位置失败

Android Fails to get location

android

google-maps-android-api-2