Question

在我的应用程序中，我有一张地图，因此当用户点击地图时，他们可以添加自定义标记。现在的问题是，当我添加了一些标记并离开应用程序时，所有标记都消失了。我需要保存这些标记，以便当应用程序再次启动或用户离开地图并返回时，它们的标记应该仍然存在。

这是我的活动：

public class Test extends Activity implements OnMapLongClickListener,  OnMapClickListener, OnMarkerClickListener{


private GoogleMap googleMap;
static final LatLng Point1 = new LatLng(xx.xxx, xx.xxx);
static final LatLng Point2 = new LatLng(xx.xxx, xx.xxx);
static final LatLng Point3 = new LatLng(xx.xxx, xx.xxx);
static final LatLng Point4 = new LatLng(xx.xxx, xx.xxx);

Bitmap bitmap;
private static final int TAKE_PICTURE = 0;
private static Uri fileUri;
final Context context = this;


@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_googlemaps);
}

@Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);

}

@Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);

  try {
        initilizeMap();

    } catch (Exception e) {
        e.printStackTrace();
    }
    }


private void initilizeMap() {
    if (googleMap == null) {
        googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();

        if (googleMap == null) {
            Toast.makeText(getApplicationContext(),
                    "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                    .show();
        }
    }
}

@Override
    public void onResume() {
    super.onResume();
    initilizeMap();

    if (googleMap!=null){
        googleMap.addMarker(new MarkerOptions().position(Point1)
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.marker)));
        googleMap.addMarker(new MarkerOptions().position(Point2)
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.marker)));
        googleMap.addMarker(new MarkerOptions().position(Point3)
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.marker)));
        googleMap.addMarker(new MarkerOptions().position(Point4)
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.marker)));
          }

 CameraPosition cameraPosition = new CameraPosition.Builder().target(
         new LatLng(xx.xxx, xx.xxx)).zoom(9).bearing(0).tilt(80).build();

 googleMap.setOnMapClickListener(this);
 googleMap.setOnMapLongClickListener(this);
 googleMap.setOnMarkerClickListener(this);
 googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
 googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
 googleMap.setMyLocationEnabled(true);
 googleMap.getUiSettings().setZoomControlsEnabled(false);
 googleMap.getUiSettings().setCompassEnabled(true);
 googleMap.getUiSettings().setMyLocationButtonEnabled(true);
 }


public void onMapLongClick(final LatLng point) {

      Intent getCameraImage = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
         getApplicationContext().getDir(
                 getResources().getString(R.string.app_name), MODE_PRIVATE);

         fileUri = Uri.fromFile(new File((Environment.getExternalStorageDirectory() +
                 "/" +getResources().getString(R.string.app_name)),new Date().getTime() + ".jpg"));

            getCameraImage.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

         startActivityForResult(getCameraImage, TAKE_PICTURE);

        }    

  public void onActivityResult(int requestCode, int resultCode, Intent data) {
      if (requestCode == TAKE_PICTURE && resultCode == RESULT_OK) {

              try {
                  GetImageThumbnail getImageThumbnail = new GetImageThumbnail();
                  bitmap = getImageThumbnail.getThumbnail(fileUri, this);
              } catch (FileNotFoundException e1) {
                  e1.printStackTrace();
              } catch (IOException e1) {
                  e1.printStackTrace();
              }
              {


              MarkerOptions markerOptions = new MarkerOptions()
             .position(Position)
             .icon(BitmapDescriptorFactory
             .fromBitmap(bitmap));
             googleMap.addMarker(markerOptions);
            }
        }
 }

        public void onMapClick (LatLng point){
    }

        @Override
        public boolean onMarkerClick(final Marker marker) {
            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                    context)
            .setIcon(R.drawable.ic_dialog);

                // set title
                alertDialogBuilder.setTitle("My Marker");

                // set dialog message
                alertDialogBuilder
                    .setMessage("Select Option")
                    .setCancelable(false)
                    .setPositiveButton("Display full Image",new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface arg0, int arg1) {
                             Intent intent = new Intent();
                                intent.setAction(Intent.ACTION_VIEW);
                                Uri imgUri = Uri.parse("file://" + fileUri);
                                intent.setDataAndType(imgUri, "image/*");
                                startActivity(intent);
                        }
                      })

                    .setNegativeButton("Delete Marker",new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,int id) {
                            // if this button is clicked, just close
                            marker.remove();
                        }
                    });

                    // create alert dialog
                    AlertDialog alertDialog = alertDialogBuilder.create();

                    // show it
                    alertDialog.show();
                    return false;
                }

        }

希望有人可以提供帮助感谢

Answer 1

Google地图不会为您保留标记。您应该保存数据库中的位置并在启动时重新加载信息（在onCreate()中，并以异步方式更好）。

OT：您使用的是已弃用的API，getMap()已替换为getMapAsync()

如何添加自定义标记来保存活动？

1 个答案: