android - Android Wear 获取 GPS 坐标

Question

我无法在我的 Android Wear 模拟器上获取位置信息。我已经尝试了很多教程，但没有奏效，我不明白出了什么问题。下面是我的示例源代码，它与谷歌的原始 Android Demo 非常相似。onLocationChanged 永远不会被执行，当我尝试检索最后一个位置时，我总是得到 NULL

import android.app.Activity;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.support.wearable.view.WatchViewStub;
import android.view.View;
import android.widget.TextView;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.wearable.Wearable;

public class MainActivity  extends Activity implements    GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener {


private TextView mTextView;
private static final long UPDATE_INTERVAL_MS = 2000;
private static final long FASTEST_INTERVAL_MS = 1000;

private GoogleApiClient mGoogleApiClient;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
    stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
        @Override
        public void onLayoutInflated(WatchViewStub stub) {
            mTextView = (TextView) stub.findViewById(R.id.text);
        }
    });

    mGoogleApiClient = new GoogleApiClient.Builder(this)


            .addApi(LocationServices.API)
            .addApi(Wearable.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
    System.out.println("Connect to Playservices...");
    mGoogleApiClient.connect();

}


@Override
public void onConnected(Bundle bundle) {
    System.out.println("onConnected");
    LocationRequest locationRequest = LocationRequest.create()
            .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
            .setInterval(UPDATE_INTERVAL_MS)
            .setFastestInterval(FASTEST_INTERVAL_MS);

    LocationServices.FusedLocationApi
            .requestLocationUpdates(mGoogleApiClient, locationRequest, this)
            .setResultCallback(new ResultCallback<Status>() {

                @Override
                public void onResult(Status status) {
                    if (status.getStatus().isSuccess()) {

                        System.out.println("Successfully requested location updates"+status.getStatusMessage());

                    } else {
                        System.out.println(
                                "Failed in requesting location updates, "
                                        + "status code: "
                                        + status.getStatusCode() + ", message: " + status
                                        .getStatusMessage());
                    }
                }
            });
}

public void getLocation(View view)
{
    Location loc=LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
    if(loc!=null) {
        System.out.println("Location: " + loc.getAltitude() + "\n" + loc.getProvider() + "\n" + loc.getLongitude());
    }
    else
    {
        System.out.println("Location null");
    }
}
@Override
public void onConnectionSuspended(int i) {
    System.out.println("onConnectionSuspended(): connection to location client suspended");
    LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
    System.out.println("onConnectionFailed(): connection to location client failed");
}

@Override
public void onLocationChanged (Location location)
{
    System.out.println("onLocationchanged: new location"+location.getAltitude());
}


@Override
protected void onStop() {
    super.onStop();
    if (mGoogleApiClient.isConnected()) {
                LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
    }
    mGoogleApiClient.disconnect();
    System.out.println("onstop");
}

@Override
protected void onResume() {
    super.onResume();
    mGoogleApiClient.connect();
    System.out.println("onresume");
}

@Override
protected void onPause() {
    super.onPause();
    if (mGoogleApiClient.isConnected()) {
        LocationServices.FusedLocationApi
                .removeLocationUpdates(mGoogleApiClient, this);
    }
    mGoogleApiClient.disconnect();
    System.out.println("onPause");

}
}