我在android studio中使用片段然后声明类型为customMapFragment的变量MySupportMapFragment。
MySupportMapFragment是一个我需要在地图谷歌地图上绘图的类，但在运行应用程序时我收到此错误：
“引起：java.lang .ClassCastException： com.google.android.gms.maps.SupportMapFragment无法转换为 com.juangaviria.juangaviriaconsulta.MySupportMapFragment“
package com.juangaviria.juangaviriaconsulta;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_fragment_mapa, container, false);
setUpMapIfNeeded();
MySupportMapFragment customMapFragment = (MySupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.map);
mMap = customMapFragment.getMap();
FrameLayout fram_map = (FrameLayout) rootView.findViewById(R.id.fram_map);
btn_draw_State = (Button) rootView.findViewById(R.id.btn_draw_State);
btnEnviarPoligono = (Button) rootView.findViewById(R.id.btnEnviarPoligono);
customMapFragment.setOnDragListener(new MapWrapperLayout.OnDragListener() {
@Override
public void onDrag(MotionEvent motionEvent) {
Log.i("ON_DRAG", "X:" + String.valueOf(motionEvent.getX()));
Log.i("ON_DRAG", "Y:" + String.valueOf(motionEvent.getY()));
float x = motionEvent.getX();
float y = motionEvent.getY();
int x_co = Integer.parseInt(String.valueOf(Math.round(x)));
int y_co = Integer.parseInt(String.valueOf(Math.round(y)));
projection = mMap.getProjection();
Point x_y_points = new Point(x_co, y_co);
LatLng latLng = mMap.getProjection().fromScreenLocation(x_y_points);
latitude = latLng.latitude;
longitude = latLng.longitude;
Log.i("ON_DRAG", "lat:" + latitude);
Log.i("ON_DRAG", "long:" + longitude);
// Handle motion event:
}
});
btn_draw_State.setText("Activar Dibujo");
btn_draw_State.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (Is_MAP_Moveable != true) {
Is_MAP_Moveable = true;
btn_draw_State.setText("Eliminar Dibujo");
} else {
Is_MAP_Moveable = false;
btn_draw_State.setText("Activar Dibujo");
val.clear();
mMap.clear();
val.add(new LatLng(latitude, longitude));
btnEnviarPoligono.setEnabled(false);
}
}
});
btnEnviarPoligono.setEnabled(false);
btnEnviarPoligono.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
String puntosPoligono = "";
LatLng obtener;
for (int i = 0 ; i < val.size() ; i++ )
{
obtener = (LatLng) val.get(i);
puntosPoligono += Integer.toString(i)+" => "+Double.toString(obtener.latitude);
puntosPoligono += " , "+Double.toString(obtener.longitude);
puntosPoligono += "\n";
}
Log.e("Puntos del poligono: ", puntosPoligono);
}
});
fram_map.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
float x = event.getX();
float y = event.getY();
int x_co = Math.round(x);
int y_co = Math.round(y);
projection = mMap.getProjection();
Point x_y_points = new Point(x_co, y_co);
LatLng latLng = mMap.getProjection().fromScreenLocation(x_y_points);
latitude = latLng.latitude;
longitude = latLng.longitude;
int eventaction = event.getAction();
switch (eventaction) {
case MotionEvent.ACTION_DOWN:
// finger touches the screen
//val.clear();
// mMap.clear();
// val.add(new LatLng(latitude, longitude));
break;
case MotionEvent.ACTION_MOVE:
// finger moves on the screen
Draw_Polyline();
val.add(new LatLng(latitude, longitude));
break;
case MotionEvent.ACTION_UP:
// finger leaves the screen
Draw_Map();
break;
}
if (Is_MAP_Moveable == true) {
return true;
} else {
return false;
}
}
});
LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
Toast.makeText(getActivity(), "GPS esta activado", Toast.LENGTH_SHORT).show();
}else{
showGPSDisabledAlertToUser();
}
return rootView;
}
public void Draw_Map() {
rectOptions = new PolygonOptions();
rectOptions.addAll(val);
rectOptions.strokeColor(Color.BLUE);
rectOptions.strokeWidth(3);
rectOptions.fillColor(Color.argb(55, 0, 255, 255));
mMap.clear();
polygon = mMap.addPolygon(rectOptions);
btnEnviarPoligono.setEnabled(true);
}
public void Draw_Polyline()
{
polylineOptions = new PolylineOptions();
polylineOptions.addAll(val);
polylineOptions.width(3);
polylineOptions.color(Color.BLUE);
mMap.addPolyline(polylineOptions);
}
private void showGPSDisabledAlertToUser(){
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
alertDialogBuilder.setMessage("GPS desactivado ¿desea activarlo?")
.setCancelable(false)
.setPositiveButton("Ir a configuraciones para activar GPS",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
Intent callGPSSettingIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGPSSettingIntent);
}
});
alertDialogBuilder.setNegativeButton("Cancelar",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
@Override
public void onMyLocationChange(Location lastKnownLocation) {
CameraUpdate myLoc = CameraUpdateFactory.newCameraPosition(
new CameraPosition.Builder().target(new LatLng(lastKnownLocation.getLatitude(),
lastKnownLocation.getLongitude())).zoom(15).build());
mMap.moveCamera(myLoc);
mMap.setOnMyLocationChangeListener(null);
}
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) getActivity().getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.setOnMyLocationChangeListener(this);
mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Activity activity) {
//myContext = (FragmentActivity) activity;
super.onAttach(activity);
/*try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}*/
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
enter code here
public void onFragmentInteraction(Uri uri);
}
enter code here
enter code here
package com.juangaviria.juangaviriaconsulta;
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
mOriginalContentView = super.onCreateView(inflater, parent, savedInstanceState);
mMapWrapperLayout = new MapWrapperLayout(getActivity());
mMapWrapperLayout.addView(mOriginalContentView);
return mMapWrapperLayout;
}
@Override
public View getView() {
return mOriginalContentView;
}
public void setOnDragListener(MapWrapperLayout.OnDragListener onDragListener) {
mMapWrapperLayout.setOnDragListener(onDragListener);
}
答案 0 :(得分：0)
据推测，res/layout/fragment_fragment_mapa.xml有SupportMapFragment，而不是MySupportMapFragment。编辑您的布局文件以引用您自己的类。