如何平滑地在Android地图上安装pin？

Question

我通过在谷歌地图android上通过使用PIN图像显示地点This Url

此URL会在放大或缩小地图时全部刷新。
我使用这个代码在AsyncTaskonPostExcution填充在地图上的通话网址销doInbackground的负荷AS-

if(!valueoftotal.equalsIgnoreCase("") && !valueoftotal.equalsIgnoreCase(null)) 
{ 
    if(Integer.parseInt(valueoftotal) > 0 && Integer.parseInt(valueoftotal) <= 100) 
    { 
     OverlayItem oi; 
     if(myHandler.getParsedData()!=null) 
     { 
      arrayList = myHandler.getParsedData();  
     } 

     linearbottom2.setClickable(true); 
     mapOverlays.clear(); 
     //OverlayItem overlayItem,overlayItem1; 
     overlay.removeAll(); 

     lineartabbar.setBackgroundResource(R.drawable.mapbar); 

     if(arrayList.size()!=0 && arrayList.size()>1) 
     { 
      for(int i = 0; i < arrayList.size(); i++) 
      { 
       String latvalue = arrayList.get(i).getLatitude().toString(); 
       String lonvalue = arrayList.get(i).getLongitude().toString(); 
       GeoPoint point = null; 

       try 
       { 
        point = new GeoPoint((int)(Double.parseDouble(latvalue)*1E6),(int)(Double.parseDouble(lonvalue)*1E6)); 
       } 
       catch (NumberFormatException e) 
       { 
        // TODO: handle exception 
       } 

       if(point != null) 
       { 

        if(arrayList.get(i).getUnitstotal().equalsIgnoreCase("1")) 
        { 
         oi = overlay.createItem(i); 
         System.out.println("overlayyyyyyyyyyyyy" + overlay + "\toiiiiiiiiii"+oi); 
         if(overlay!=null) 
         { 
          overlay.addItem(oi); 
         } 
        } 
        else if(!arrayList.get(i).getUnitstotal().equalsIgnoreCase("1")) 
        { 
         oi = overlay.createItem(i); 
         if(overlay!=null) 
         { 
          System.out.println("2overlayyyyyyyyyyyyy" + overlay + "\toiiiiiiiiii" + oi); 
          overlay.addItem(oi); 
         } 
        } 
       } 
      } 
      mapOverlays.add(overlay); 
      mapView.invalidate(); 
     } 
     else if(arrayList.size()!=0 && arrayList.size()==1) 
     { 
      for(int i = 0; i < arrayList.size(); i++) 
      { 
       String latvalue = arrayList.get(i).getLatitude().toString(); 
       String lonvalue = arrayList.get(i).getLongitude().toString(); 
       GeoPoint point = null; 
       try 
       { 
        point = new GeoPoint((int)(Double.parseDouble(latvalue)*1E6),(int)(Double.parseDouble(lonvalue)*1E6)); 
       } 
       catch (NumberFormatException e) 
       { 
        // TODO: handle exception 
       } 

       if(point != null) 
       { 
        if(arrayList.get(i).getUnitstotal().equalsIgnoreCase("1")) 
        { 
         oi = overlay.createItem(i); 
         System.out.println("listing when 1 value is "+arrayList.get(i).getUnitstotal()); 
         overlay.addItem(oi); 
         mc.animateTo(point); 
        } 
        else if(!arrayList.get(i).getUnitstotal().equalsIgnoreCase("1")) 
        { 
         oi = overlay.createItem(i); 
         System.out.println("listing when more value is "+ arrayList.get(i).getUnitstotal()); 
         overlay.addItem(oi); 
         mc.animateTo(point); 
         mc.setCenter(point); 
         mc.setZoom(18); 
        } 
       } 
      } 

      mapOverlays.add(overlay); 
      mapView.invalidate(); 
      MapController mcontrller =mapView.getController(); 

但问题是，当我立即触摸地图，它删除所有引脚，并开始装载新位置。我想先平稳地加载所有位置，然后再移除。

请任何人都帮我ASAP，对不起我的解释。

Answer 1

public class HelloAndroidGpsActivity extends Activity implements OnClickListener, android.content.DialogInterface.OnClickListener 
{ 
    private EditText editTextShowLocation; 
    private Button buttonGetLocation; 
    private ProgressBar progress; 

    private LocationManager locManager; 
    private LocationListener locListener = new MyLocationListener(); 

    private boolean gps_enabled = false; 
    private boolean network_enabled = false; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.main); 
      editTextShowLocation = (EditText) findViewById(R.id.editTextShowLocation); 
      progress = (ProgressBar) findViewById(R.id.progressBar1); 
      progress.setVisibility(View.GONE); 
      buttonGetLocation = (Button) findViewById(R.id.buttonGetLocation); 
      buttonGetLocation.setOnClickListener(this); 
      locManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); 
    } 

    @Override 
    public void onClick(View v) { 
      progress.setVisibility(View.VISIBLE); 
      // exceptions will be thrown if provider is not permitted. 
      try { 
       gps_enabled = locManager.isProviderEnabled(LocationManager.GPS_PROVIDER); 
      } catch (Exception ex) { 

      } 
      try { 
       network_enabled = locManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER); 
      } catch (Exception ex) { 

      } 

      // don't start listeners if no provider is enabled 
      if (!gps_enabled && !network_enabled) { 
       AlertDialog.Builder builder = new Builder(this); 
       builder.setTitle("Attention!"); 
       builder.setMessage("Sorry, location is not determined. Please enable location providers"); 
       builder.setPositiveButton("OK", this); 
       builder.setNeutralButton("Cancel", this); 
       builder.create().show(); 
       progress.setVisibility(View.GONE); 
      } 

      if (gps_enabled) { 
       locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locListener); 
      } 
      if (network_enabled) { 
       locManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locListener); 
      } 
     } 

class MyLocationListener implements LocationListener { 
    @Override 
    public void onLocationChanged(Location location) { 
     if (location != null) { 
      // This needs to stop getting the location data and save the battery power. 
      locManager.removeUpdates(locListener); 

      String londitude = "Londitude: " + location.getLongitude(); 
      String latitude = "Latitude: " + location.getLatitude(); 
      String altitiude = "Altitiude: " + location.getAltitude(); 
      String accuracy = "Accuracy: " + location.getAccuracy(); 
      String time = "Time: " + location.getTime(); 

      editTextShowLocation.setText(londitude + "\n" + latitude + "\n" + altitiude + "\n" + accuracy + "\n" + time); 
      progress.setVisibility(View.GONE); 
     } 
    } 

    @Override 
    public void onProviderDisabled(String provider) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void onProviderEnabled(String provider) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) { 
     // TODO Auto-generated method stub 

    } 
} 

@Override 
public void onClick(DialogInterface dialog, int which) { 
    if(which == DialogInterface.BUTTON_NEUTRAL){ 
     editTextShowLocation.setText("Sorry, location is not determined. To fix this please enable location providers"); 
    }else if (which == DialogInterface.BUTTON_POSITIVE) { 
     startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS)); 
    } 
} 

}