我正在尝试实现当前位置图应用程序,我在片段中加载地图但是它需要经纬度值来定位地址..如何实现当前位置功能来映射...在此先感谢..
这是我的地图片段..
public class ContactFragment extends Fragment {
MapView mapView;
GoogleMap googleMap;
private WebView contactWebView;
public ContactFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_contact, container, false);
getActivity().setTitle("Contact Us");
contactWebView = (WebView)view.findViewById(R.id.contact_us);
contactWebView.setBackgroundColor(0);
if(Build.VERSION.SDK_INT >= 11){
contactWebView.setLayerType(WebView.LAYER_TYPE_SOFTWARE, null);
}
contactWebView.getSettings().setBuiltInZoomControls(true);
AssetManager mgr = getContext().getAssets();
String filename = null;
try {
filename = "contact.html";
System.out.println("filename : " + filename);
InputStream in = mgr.open(filename, AssetManager.ACCESS_BUFFER);
String sHTML = StreamToString(in);
in.close();
contactWebView.loadDataWithBaseURL(null, sHTML, "text/html", "utf-8", null);
//singleContent.setText(Html.fromHtml(sHTML));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mapView = (MapView) view.findViewById(R.id.map);
mapView.onCreate(savedInstanceState);
if (mapView != null) {
googleMap = mapView.getMap();
googleMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.marker))
.anchor(0.5f, 1.0f)
.position(new LatLng( 12.895960, 77.559921)));
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
if (ActivityCompat.checkSelfPermission(getActivity(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
MapsInitializer.initialize(this.getActivity());
LatLng position = new LatLng(12.895960, 77.559921);
CameraUpdate updatePosition = CameraUpdateFactory.newLatLng(position);
googleMap.moveCamera(updatePosition);
//googleMap.animateCamera(updatePosition);
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(position,16));
return view;
}
googleMap.setMyLocationEnabled(true);
googleMap.getUiSettings().setZoomControlsEnabled(true);
MapsInitializer.initialize(this.getActivity());
// LatLngBounds.Builder builder = new LatLngBounds.Builder();
// builder.include(new LatLng(12.8909537, 77.5594254));
// LatLngBounds bounds = builder.build();
int padding = 0;
LatLng position = new LatLng(12.895960, 77.559921);
CameraUpdate updatePosition = CameraUpdateFactory.newLatLng(position);
CameraUpdate updateZoom = CameraUpdateFactory.zoomBy(8);
googleMap.moveCamera(updatePosition);
googleMap.animateCamera(updateZoom);
}
return view;
}
@Override
public void onResume() {
mapView.onResume();
super.onResume();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
public static String StreamToString(InputStream in) throws IOException {
if(in == null) {
return "";
}
Writer writer = new StringWriter();
char[] buffer = new char[1024];
try {
Reader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
int n;
while ((n = reader.read(buffer)) != -1) {
writer.write(buffer, 0, n);
}
} finally {
}
return writer.toString();
}
}
答案 0 :(得分:0)
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
mMap.setMyLocationEnabled(true);
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!"));
}
});
}
}
答案 1 :(得分:0)
通过此documentation Google,Android设备可用的位置数据包括使用多种技术组合设备的当前位置 - 移动的方向和方法,以及设备是否已移过预定义的地理边界或地理围栏。
根据您的应用需求,您可以选择 几种处理位置数据的方法:
我的位置图层提供了一种在地图上显示设备位置的简单方法。它不提供数据。
建议所有针对位置数据的程序化请求使用 Google Play服务位置API 。
LocationSource 界面允许您提供自定义位置提供程序。
有关更多信息,请查看文档,它将解释您需要的所有内容以及这些教程和相关的SO问题。