我有一个“调查”，我使用edittext填充信息（姓名，姓氏，电子邮件等）和带有标记的地图，它可以拖动，用户可以将其移动到部分地图，之后有一个按钮，当它被点击时，信息被发送并存储在数据库中，在发送信息后，所有的edittext都被清理，但是标记保持在用户放置的相同位置，所以我的问题是，如何在发送调查后将标记移动到初始位置？ 如何实现这一点的任何想法将不胜感激！
CUSTOM MAPVIEW：
public class CustomMapView extends MapView {
public CustomMapView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_UP:
System.out.println("unlocked");
this.getParent().requestDisallowInterceptTouchEvent(false);
break;
case MotionEvent.ACTION_DOWN:
System.out.println("locked");
this.getParent().requestDisallowInterceptTouchEvent(true);
break;
}
return super.dispatchTouchEvent(ev);
}
}
NEW LOGCAT：
10-28 20:16:47.515 9087-9087/com.example.lupitagarcia.yosoyvallarta E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.lupitagarcia.yosoyvallarta, PID: 9087
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.GoogleMap.clear()' on a null object reference
at com.example.lupitagarcia.yosoyvallarta.TerminosYC$CargarDatos.onPostExecute(TerminosYC.java:836)
at com.example.lupitagarcia.yosoyvallarta.TerminosYC$CargarDatos.onPostExecute(TerminosYC.java:738)
at android.os.AsyncTask.finish(AsyncTask.java:651)
at android.os.AsyncTask.access$500(AsyncTask.java:180)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:668)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7406)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
XML：
<com.example.lupitagarcia.yosoyvallarta.CustomMapView
android:id="@+id/mapview"
android:layout_width="match_parent"
android:layout_height="300dp" />
主：
googleMap.setOnMarkerDragListener(new GoogleMap.OnMarkerDragListener() {
@Override
public void onMarkerDragStart(Marker marker) {
LatLng position = marker.getPosition();
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(position.latitude, position.longitude), 15));
}
@Override
public void onMarkerDrag(Marker marker) {
LatLng position = marker.getPosition();
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(position.latitude, position.longitude), 15));
}
@Override
public void onMarkerDragEnd(Marker marker) {
LatLng position = marker.getPosition();
latitudeeeee = position.latitude;
longitudeeee = position.longitude;
}
});
}
public class CargarDatos extends AsyncTask<String, Void, String> {
protected String doInBackground(String... urls) {
////////////////-------------
String correo = campo_correo.getText().toString().trim();
String nombre = campo_nombre.getText().toString().trim();
String apellido= campo_apellido.getText().toString().trim();
String telefono= campo_telefono.getText().toString().trim();
String categoria= customspinner.getSelectedItem().toString().trim();
String titulo = campo_titulo.getText().toString().trim();
String descripcion = campo_descripcion.getText().toString().trim();
String latitud = Double.toString(latitudeeeee);
String longitud = Double.toString(longitudeeee);
String s = (campo_publico.isChecked() ? "1" : "0");
String r = (campo_terminos.isChecked() ? "1" : "0");
//getting the actual path of the image
String path = getPath(filePath);
//Uploading code
try {
String uploadId = UUID.randomUUID().toString();
//Creating a multi part request
new MultipartUploadRequest(TerminosYC.this.getActivity(), uploadId, Constants.UPLOAD_URL)
.addFileToUpload(path, "image") //Adding file
.addParameter("name",correo) //Adding text parameter to the request
.addParameter("nombre",nombre)
.addParameter("apellido",apellido)
.addParameter("telefono", telefono)
.addParameter("categoria", categoria)
.addParameter("titulo", titulo)
.addParameter("descripcion", descripcion)
.addParameter("publico", s)
.addParameter("terminos", r)
.addParameter("latitud",latitud)
.addParameter("longitud",longitud)
.setNotificationConfig(new UploadNotificationConfig())
.setMaxRetries(2)
.startUpload(); //Starting the upload
} catch (Exception exc) {
Toast.makeText(TerminosYC.this.getActivity(), exc.getMessage(), Toast.LENGTH_SHORT).show();
}
// params comes from the execute() call: params[0] is the url.
try {
return downloadUrl(urls[0]);
} catch (IOException e) {
return "Unable to retrieve web page. URL may be invalid.";
}
}
ProgressDialog loading;
RequestHandler rh = new RequestHandler();
@Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(TerminosYC.this.getActivity(), "Enviando reporte", "Porfavor espere...", true, true);
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
loading.dismiss();
showAlertDialogMensaje(TerminosYC.this.getActivity(), "Reporte", "El reporte ha sido enviado!", true);
campo_correo.setText(null);
campo_nombre.setText(null);
campo_apellido.setText(null);
campo_telefono.setText(null);
customspinner.setSelection(0);
campo_titulo.setText(null);
campo_descripcion.setText(null);
imageView.setImageResource(0);
imagencargada.setVisibility(View.GONE);
textoimagencargada.setVisibility(View.GONE);
campo_terminos.setError(null);
buttonChoose.setError(null);
campo_publico.setChecked(false);
campo_terminos.setChecked(false);
areaLeyendaImagen.setVisibility(View.GONE);
areaFotoCargada.setVisibility(View.GONE);
imagencargada.setVisibility(View.GONE);
textoimagencargada.setVisibility(View.GONE);
area_cerrarIagen.setVisibility(View.GONE);
cerrarImagen.setVisibility(View.GONE);
bb.setEnabled(true);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
bb.setBackgroundTintList(ContextCompat.getColorStateList(TerminosYC.this.getContext(), R.color.enable));
}
logcat的：
10-28 19:59:48.687 3297-3297/com.example.lupitagarcia.yosoyvallarta E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.lupitagarcia.yosoyvallarta, PID: 3297
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.GoogleMap.clear()' on a null object reference
at com.example.lupitagarcia.yosoyvallarta.TerminosYC$CargarDatos.onPostExecute(TerminosYC.java:830)
at com.example.lupitagarcia.yosoyvallarta.TerminosYC$CargarDatos.onPostExecute(TerminosYC.java:737)
at android.os.AsyncTask.finish(AsyncTask.java:651)
at android.os.AsyncTask.access$500(AsyncTask.java:180)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:668)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7406)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
答案 0 :(得分：0)
创建一个包含所需初始位置LatLng的变量。
private static final LatLng initialPosition = new LatLng(21.606789, -102.206598);
然后是您的CargarDatos
public class CargarDatos extends AsyncTask<String, Void, String> {
private GoogleMap googleMap;
// Create a constructor that holds your googleMap.
public CargarDatos (GoogleMap googleMap) {
this.googleMap = googleMap;
}
// Some of your stuff ...
@Override
protected void onPostExecute(String result) {
googleMap.clear();
googleMap.addMarker(new MarkerPosition().position(initialPosition).title("StartPosition"));
}
}
然后致电您的CargarDatos
CargarDatos cargarDatos = new CargarDatos(googleMap);
cargarDatos.execute();
编辑：
public class CustomMapView extends MapView {
// Some of your stuff...
public void clear() {
this.clear();
}
}