Question

我正在开展谷歌地图活动。我正在尝试获取当前location.it在模拟器上完美运行但没有获取我手机上的当前位置。这是我在我的应用程序中使用的代码...

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_FINE);
    provider = locationManager.getBestProvider(criteria, false);
    Location location = locationManager.getLastKnownLocation(provider);

    if (location != null) {
        double lat = (double) (location.getLatitude());
        double lng = (double) (location.getLongitude());

        Constants.lat = String.valueOf(lat);
        Constants.lng = String.valueOf(lng);
     }

常量是我已经对所声明的纬度和经度静态变量进行十分转换的类。这段代码写在一个函数中，它是从onCreate方法调用的。我每次都得到null位置。我在manifestfile中也声明了下面的代码。

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

有人可以帮帮我吗？谢谢。

Answer 1

从文档中试用此代码。

    private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (mMap == null) {
        // Try to obtain the map from the SupportMapFragment.
        mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                .getMap();
        mMap.setMyLocationEnabled(true);
        // Check if we were successful in obtaining the map.
        if (mMap != null) {


         mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {

       @Override
       public void onMyLocationChange(Location arg0) {
        // TODO Auto-generated method stub

         mMap.addMarker(new MarkerOptions().position(new    LatLng(arg0.getLatitude(), arg0.getLongitude())).title("It's Me!"));
       }
      });

        }
    }
}

在onCreate中调用此功能。希望有所帮助。

android谷歌地图当前位置没有得到

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