React-native Android地理定位

我试图为此创建自己的Android原生组件.我已经尝试使用模拟器(通过命令行设置一些坐标)和手机,但操作栏中没有gps图标,并且反应回调中没有数据.

我正在尝试立即获取最后一个已知位置,我也正在设置事件监听器以进行更新.

public class GeoLocation extends ReactContextBaseJavaModule implements
    GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener {

protected static final String TAG = "GeoLocation";
protected GoogleApiClient mGoogleApiClient;
protected Location mLastLocation;


public GeoLocation(ReactApplicationContext reactContext) {
    super(reactContext);
    buildGoogleApiClient();
}

@Override
public String getName() {
    return "GeoLocation";
}

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

@Override
public void onConnected(Bundle connectionHint) {

    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    //WritableMap params = Arguments.createMap();

    //Can I use ConcurrentHashMap instead of WritableMap?
    ConcurrentHashMap<String,String> params = new ConcurrentHashMap();
    params.put("lastLocation",mLastLocation.toString());
    sendEvent(getReactApplicationContext(),"geoCoordsChanged",params);
}

@Override
public void onConnectionFailed(ConnectionResult result) {
    Log.i(TAG,"Connection failed: ConnectionResult.getErrorCode() = " + result.getErrorCode());
}

@Override
public void onConnectionSuspended(int cause) {
    mGoogleApiClient.connect();
}

@ReactMethod
public void getLastLocation(Callback success,Callback err){
    try {
        String msg = "No location found yet";

        if(mLastLocation != null){
            msg = mLastLocation.toString();
        }

        success.invoke(msg);
    } catch (Exception e) {
        err.invoke(e.getMessage());
    }
}

private void sendEvent(ReactContext reactContext,String eventName,@Nullable ConcurrentHashMap<String,String> params) {
  try {
      reactContext
          .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
          .emit(eventName,params);
  } catch(Exception e){

  }
}

权限：

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

<application
  android:allowBackup="true"
  android:label="@string/app_name"
  android:icon="@mipmap/ic_launcher"
  android:theme="@style/AppTheme">

    <meta-data android:name="com.google.android.gms.version"
               android:value="@integer/google_play_services_version" />

我还没有从logcat日志中找到任何相关内容.任何提示这个代码有什么问题或任何一种获得地理坐标的解决方案都会很棒！