在Android中獲取用戶位置似乎不可能

Question

我試了幾天來檢索用戶的位置，但沒有成功。 textview未更新。 我試過調試，但沒有收到位置。

這裏是我的代碼：

MainActivity

package com.pislaru.andro; 
 

 
import android.location.Location; 
 
import android.support.v4.app.FragmentActivity; 
 
import android.os.Bundle; 
 
import android.util.Log; 
 
import android.widget.TextView; 
 

 
import com.google.android.gms.maps.model.LatLng; 
 

 
public class MainActivity extends FragmentActivity implements LocationProvider.LocationCallback { 
 

 
    public static final String TAG = MainActivity.class.getSimpleName(); 
 

 
    private LocationProvider mLocationProvider; 
 

 
    TextView t; 
 

 
    @Override 
 
    protected void onCreate(Bundle savedInstanceState) { 
 
     super.onCreate(savedInstanceState); 
 
     setContentView(R.layout.activity_main); 
 

 
     TextView t; 
 
     t = new TextView(this); 
 
     t = (TextView)findViewById(R.id.text); 
 
     t.setText("Hello !"); 
 

 
     mLocationProvider = new LocationProvider(this, this); 
 
    } 
 

 
    @Override 
 
    protected void onResume() { 
 
     super.onResume(); 
 
     mLocationProvider.connect(); 
 
    } 
 

 
    @Override 
 
    protected void onPause() { 
 
     super.onPause(); 
 
     mLocationProvider.disconnect(); 
 
    } 
 

 
    public void handleNewLocation(Location location) { 
 
     t.setText(location.toString()); 
 
     Log.i(TAG, location.toString()); 
 

 
     double currentLatitude = location.getLatitude(); 
 
     double currentLongitude = location.getLongitude(); 
 
    } 
 

 
}

LocationProvider

package com.pislaru.andro; 
 

 
import android.app.Activity; 
 
import android.content.Context; 
 
import android.content.IntentSender; 
 
import android.location.Location; 
 
import android.os.Bundle; 
 
import android.util.Log; 
 
import com.google.android.gms.common.ConnectionResult; 
 
import com.google.android.gms.common.api.GoogleApiClient; 
 
import com.google.android.gms.location.LocationListener; 
 
import com.google.android.gms.location.LocationRequest; 
 
import com.google.android.gms.location.LocationServices; 
 

 
public class LocationProvider implements 
 
     GoogleApiClient.ConnectionCallbacks, 
 
     GoogleApiClient.OnConnectionFailedListener, 
 
     LocationListener { 
 

 
    public abstract interface LocationCallback { 
 
     public void handleNewLocation(Location location); 
 
    } 
 

 
    public static final String TAG = LocationProvider.class.getSimpleName(); 
 

 
    /* 
 
    * Define a request code to send to Google Play services 
 
    * This code is returned in Activity.onActivityResult 
 
    */ 
 
    private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000; 
 

 
    private LocationCallback mLocationCallback; 
 
    private Context mContext; 
 
    private GoogleApiClient mGoogleApiClient; 
 
    private LocationRequest mLocationRequest; 
 

 
    public LocationProvider(Context context, LocationCallback callback) { 
 
     mGoogleApiClient = new GoogleApiClient.Builder(context) 
 
       .addConnectionCallbacks(this) 
 
       .addOnConnectionFailedListener(this) 
 
       .addApi(LocationServices.API) 
 
       .build(); 
 

 
     mLocationCallback = callback; 
 

 
     // Create the LocationRequest object 
 
     mLocationRequest = LocationRequest.create() 
 
       .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY) 
 
       .setInterval(10 * 1000)  // 10 seconds, in milliseconds 
 
       .setFastestInterval(1 * 1000); // 1 second, in milliseconds 
 

 
     mContext = context; 
 
    } 
 

 
    public void connect() { 
 
     mGoogleApiClient.connect(); 
 
    } 
 

 
    public void disconnect() { 
 
     if (mGoogleApiClient.isConnected()) { 
 
      LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this); 
 
      mGoogleApiClient.disconnect(); 
 
     } 
 
    } 
 

 
    @Override 
 
    public void onConnected(Bundle bundle) { 
 
     Log.i(TAG, "Location services connected."); 
 

 
     try 
 
     { 
 
      Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient); 
 
      if (location == null) { 
 
       LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this); 
 
      } 
 
      else { 
 
       mLocationCallback.handleNewLocation(location); 
 
      } 
 
     } catch(SecurityException e) { Log.i(TAG, e.toString()); } 
 
    } 
 

 
    @Override 
 
    public void onConnectionSuspended(int i) { 
 

 
    } 
 

 
    @Override 
 
    public void onConnectionFailed(ConnectionResult connectionResult) { 
 
     /* 
 
     * Google Play services can resolve some errors it detects. 
 
     * If the error has a resolution, try sending an Intent to 
 
     * start a Google Play services activity that can resolve 
 
     * error. 
 
     */ 
 
     if (connectionResult.hasResolution() && mContext instanceof Activity) { 
 
      try { 
 
       Activity activity = (Activity)mContext; 
 
       // Start an Activity that tries to resolve the error 
 
       connectionResult.startResolutionForResult(activity, CONNECTION_FAILURE_RESOLUTION_REQUEST); 
 
      /* 
 
      * Thrown if Google Play services canceled the original 
 
      * PendingIntent 
 
      */ 
 
      } catch (IntentSender.SendIntentException e) { 
 
       // Log the error 
 
       e.printStackTrace(); 
 
      } 
 
     } else { 
 
      /* 
 
      * If no resolution is available, display a dialog to the 
 
      * user with the error. 
 
      */ 
 
      Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode()); 
 
     } 
 
    } 
 

 
    @Override 
 
    public void onLocationChanged(Location location) { 
 
     mLocationCallback.handleNewLocation(location); 
 
    } 
 
}

清單

<uses-permission android:name="android.permission.INTERNET" /> 
 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
 
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /> 
 
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
 
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

怎麼辦？ 提及GPS在設備上啓用並且也來自設置。 該設備已連接到Wi-Fi。 已啓用Google Play服務。 我不明白爲什麼這不起作用。 我聽說這是一個名爲smart-location的軟件包。最好是我的代碼？

Answer 1

只要刪除代碼中的onCreate這兩條線（）：

TextView t; 
t = new TextView(this);