如何使用自定义标记添加保存活动？

Question

在我的应用程序中，我有一张地图，所以当用户点击地图上的某个点时，他们可以添加自定义标记。现在的问题是，当我添加了几个标记，并离开应用程序所有的标记都消失了。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。

这里是我的活动：

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; 
       } 

     } 

希望有人能帮助 感谢

Answer 1

谷歌地图不留标记为您服务。您应该保存数据库中的职位，并在启动时重新加载信息（在onCreate()中以更好的异步方式）。

OT：您正在使用过时的API时，getMap()已替换为getMapAsync()