伙计们，我在我的 Android 应用程序中实现了谷歌地图，并开始创建一个标记，我在 map 中间放置了一个标记图像。现在，我希望每当用户拖动 map 时，我都能得到 map 中心的位置(我放置图像的位置看起来像一个标记)。
我的 map Activity 是:
public class MapActivity extends FragmentActivity implements LocationListener {
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
TextView Title;
FrameLayout goback;
Location myLocation;
LocationManager locationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
setUpMapIfNeeded();
SupportMapFragment supportMapFragment =
(SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mMap = supportMapFragment.getMap();
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null) {
onLocationChanged(location);
}
locationManager.requestLocationUpdates(bestProvider, 20000, 0, this);
//try
Title=(TextView)findViewById(R.id.map_title);
Title.setText(getIntent().getExtras().getString("Header"));
goback=(FrameLayout)findViewById(R.id.frame_layout);
setUpMapIfNeeded();
// mMap.setMyLocationEnabled(true);
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
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();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
}
@Override
public void onLocationChanged(Location location) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
BitmapDescriptor icon = BitmapDescriptorFactory.fromResource(R.drawable.marker);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(5));
CameraPosition ll=mMap.getCameraPosition();
Toast.makeText(getApplicationContext(),""+ll,Toast.LENGTH_LONG).show();
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
请帮助我这样做，谢谢:)
最佳答案
首先您可以获取您的 map 容器的引用，并通过除以 2 的宽度和高度来计算中心点。
View containerView=findViewById(R.id.mapContainer);
LatLng centerPoint= this.map.getProjection().fromScreenLocation(new Point(((int)containerView.getWidth/2),((int)(containerView.getHeight/2)));
关于android - 如何在 map 中心的谷歌地图中获取位置(经纬度/名称)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32759018/