android - new locationclient(this,this,this) 编译错误

Question

我正在尝试使用新的谷歌位置服务更新旧教程。我直接使用来自谷歌教程的代码，但是行 mLocationClient = new LocationClient(this,this,this);返回错误构造函数 LocationClient(RunFragment, RunFragment, RunFragment) 未定义

我的代码和教程之间的唯一区别是我在 fragment 中的 onCreateView 中运行它，而不是从 Activity 中运行。有什么建议我可以纠正这个吗？谢谢。

public class RunFragment extends Fragment implements

位置监听器，GooglePlayServicesClient.ConnectionCallbacks，GooglePlayServicesClient.OnConnectionFailedListener {

private Button mStartButton, mStopButton;
private TextView mStartedTextView, mLatitudeTextView, 
    mLongitudeTextView, mAltitudeTextView, mDurationTextView;


// A request to connect to Location Services
private LocationRequest mLocationRequest;

// Stores the current instantiation of the location client in this object
private LocationClient mLocationClient;

// Handle to SharedPreferences for this app
SharedPreferences mPrefs;

// Handle to a SharedPreferences editor
SharedPreferences.Editor mEditor;

/*
 * Note if updates have been turned on. Starts out as "false"; is set to "true" in the
 * method handleRequestSuccess of LocationUpdateReceiver.
 *
 */
boolean mUpdatesRequested = false;

@Override
public void onCreate(Bundle savedInstanceState) {


    super.onCreate(savedInstanceState);
    setRetainInstance(true);



}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_run, container, false);

    mStartedTextView = (TextView)view.findViewById(R.id.run_startedTextView);
    mLatitudeTextView = (TextView)view.findViewById(R.id.run_latitudeTextView);
    mLongitudeTextView = (TextView)view.findViewById(R.id.run_longitudeTextView);
    mAltitudeTextView = (TextView)view.findViewById(R.id.run_altitudeTextView);
    mDurationTextView = (TextView)view.findViewById(R.id.run_durationTextView);

    mStartButton = (Button)view.findViewById(R.id.run_startButton);


    mStopButton = (Button)view.findViewById(R.id.run_stopButton);

    // Create a new global location parameters object
    mLocationRequest = LocationRequest.create();

    /*
     * Set the update interval
     */
    mLocationRequest.setInterval(LocationUtils.UPDATE_INTERVAL_IN_MILLISECONDS);

    // Use high accuracy
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    // Set the interval ceiling to one minute
    mLocationRequest.setFastestInterval(LocationUtils.FAST_INTERVAL_CEILING_IN_MILLISECONDS);

    // Note that location updates are off until the user turns them on
    mUpdatesRequested = false;

    // Open Shared Preferences

    mPrefs = getActivity().getSharedPreferences(LocationUtils.SHARED_PREFERENCES, Context.MODE_PRIVATE);

    // Get an editor
    mEditor = mPrefs.edit();

    /*
     * Create a new location client, using the enclosing class to
     * handle callbacks.
     */
    mLocationClient = new LocationClient(this,this,this);



    //updateUI();

    return view;
}

@Override
public void onConnectionFailed(ConnectionResult result) {
    // TODO Auto-generated method stub

}

@Override
public void onConnected(Bundle connectionHint) {
    // TODO Auto-generated method stub

}

@Override
public void onDisconnected() {
    // TODO Auto-generated method stub

}

@Override
public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub

}

Answer 1

第一个参数必须是 Activity 的上下文。

在您的 MainActivity 中声明:

public static Context c;

在 MainActivity 的 onCreate 方法中:

c = this;

现在你可以这样调用你的方法了:

mLocationClient = new LocationClient(MainActivity.c, this, this); 

注意:MainActivity 是使您的 fragment 膨胀的 Activity。