打开地图显示当前位置和所需位置按钮单击

Question

我有图像视图。在点击这个图片来看，它必须打开谷歌地图，我用下面的代码：

Intent intent = new Intent(android.content.Intent.ACTION_VIEW, 
    Uri.parse("http://maps.google.com/maps?saddr="+latitude_source+","+longitude_source+"&daddr="+latitude_dest+","+longitude_dest)); 

    startActivity(intent); 

在上面的代码，我们需要给以下：

来源纬度，源经度，目的纬度和目标经度现在

我的要求如下：

我知道目的地的经纬度。我必须从用户当前位置获取源纬度和经度。我怎样才能做到这一点？

Answer 1

//Handle run time permission 
//implement LocationListener in your Activity or fragment 
//Add required permission in manifest 

private GoogleApiClient mGoogleApiClient; 
private LocationRequest mLocationRequest; 
private Location mLocation; 



mGoogleApiClient = new GoogleApiClient.Builder(this) 
       .addConnectionCallbacks(this) 
       .addOnConnectionFailedListener(this) 
       .addApi(LocationServices.API) 
       .build(); 
mLocationRequest = LocationRequest.create() 
       .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY) 
       .setInterval(60 * 10 * 1000)  // 10 seconds, in milliseconds 
       .setFastestInterval(10 * 1000); 


private void LocationRequest() { 
     if (mGoogleApiClient.isConnected()) { 
      if (ContextCompat.checkSelfPermission(this, 
        android.Manifest.permission.ACCESS_FINE_LOCATION) 
        == PackageManager.PERMISSION_GRANTED) { // to handle permission 6.0 and above 
       mLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient); 
       if (mLocation == null) { 
        BuildUtils.Log("Location", "null"); 
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this); 
       } 
      } 
     } 
    } 


@Override 
    public void onLocationChanged(Location location) { //LocationListener implementation 
     mLocation = location; 
} 

更多细节：https://developer.android.com/training/location/retrieve-current.html