Android的項目覆蓋！在地圖上放置並移除標記

我想顯示用戶的當前位置並允許用戶在地圖上放置一個標記。當用戶點擊他放置的標記時，標記將消失，並且他可以再次在地圖上放置另一個標記。Android的項目覆蓋！在地圖上放置並移除標記

以下代碼在顯示用戶的當前位置並在地圖上放置一個標記時正常工作。它也能夠移除標記。但是，一旦我嘗試在移除地圖後重新放置地圖上的標記。該程序崩潰！有誰能告訴我原因嗎？從日食

class InterestingLocations extends ItemizedOverlay { 
    private ArrayList<OverlayItem> locations = new ArrayList<OverlayItem>(); 
    private GeoPoint center = null; 
    private Context mContext ; 
    private boolean placed=false; 


    public InterestingLocations(Drawable defaultMarker) { 
     super(boundCenterBottom(defaultMarker)); 
     // create locations of interest 
     GeoPoint me = new 
      GeoPoint((int)(lat*1000000),(int)(lng*1000000)); 

     locations.add(new OverlayItem(me, 
       "Me!", "Me! Me! Me!")); 
     center=me; 
     populate(); 
     } 

    public InterestingLocations(Drawable marker, Context context) 
    { 
     super(marker); 
     mContext= context; 
     // create locations of interest 
     GeoPoint me = new 
      GeoPoint((int)(lat*1000000),(int)(lng*1000000)); 

     locations.add(new OverlayItem(me, 
       "Me!", "Me!")); 
     center=me; 

     populate(); 
    } 

    // We added this method to find the middle point of the cluster 
    // Start each edge on its opposite side and move across with each point. 
    // The top of the world is +90, the bottom -90, 
    // the west edge is -180, the east +180 


    @Override 
    public void draw(Canvas canvas, MapView mapview, boolean shadow) { 
     // Here is where we can eliminate shadows by setting to false 
     super.draw(canvas, mapview, shadow); 
    } 

    @Override 
    protected OverlayItem createItem(int i) { 
     return locations.get(i); 
    } 

    @Override 
    public int size() { 
     return locations.size(); 
    } 

    public boolean onTap (final GeoPoint p, final MapView mapView){ 
     boolean tapped = super.onTap(p, mapView); 
     Log.i("onTap", "onTap 1"); 

     if (tapped){    
      Log.i("Hit item!!", "Hited"); 
      //do what you want to do when you hit an item  
      if(p!=me2){ 
       Log.i("Hit item!!", "Hited and p!=me2"); 
       removeOverlay(); 
       placed=false; 
      } 
     }   
     else{ 
      if(placed==false&&placeAble==true){ 
       Log.i("placed=="+placed, "placed==false"); 

       addOverlay(new OverlayItem(p, "Dest", "Destination")); 
       destLat = (float)p.getLatitudeE6()/1000000f; 
       destLng = (float)p.getLongitudeE6()/1000000f; 
       placed=true; 
      } 
      else{ 
       Log.i("placed=="+placed, "here is else"); 
      } 
      //do what you want to do when you DONT hit an item 
      }     
     return true; 
    } 


    //You must have this method, even if it doesn't visibly do anything 
    @Override 
    protected boolean onTap(int index) { 

     Log.i("Hit item!!", "Hited"+ index); 
     return true; 
    } 


    public void addOverlay(OverlayItem overlay) { 
     locations.add(overlay); 
     populate(); 
    } 


    public void removeOverlay() { 
     locations.clear(); 
     GeoPoint me = new GeoPoint((int)(lat*1000000),(int)(lng*1000000)); 
     locations.add(new OverlayItem(me, "Me!", "Me! Me! Me!")); 
     populate(); 
    } 


}

錯誤：

06-04 18:03:03.859: E/global(29049): Deprecated Thread methods are not supported. 
06-04 18:03:03.859: E/global(29049): java.lang.UnsupportedOperationException 
06-04 18:03:03.859: E/global(29049): at java.lang.VMThread.stop(VMThread.java:85) 
06-04 18:03:03.859: E/global(29049): at java.lang.Thread.stop(Thread.java:1280) 
06-04 18:03:03.859: E/global(29049): at java.lang.Thread.stop(Thread.java:1247) 
06-04 18:03:03.859: E/global(29049): at com.knowithk.kpass.KPassActivity$1.run(KPassActivity.java:46) 
06-04 18:03:17.429: E/MapActivity(29049): Couldn't get connection factory client 
06-04 18:03:32.773: E/AndroidRuntime(29049): FATAL EXCEPTION: main 
06-04 18:03:32.773: E/AndroidRuntime(29049): java.lang.ArrayIndexOutOfBoundsException 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.google.android.maps.ItemizedOverlay.maskHelper(ItemizedOverlay.java:562) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.google.android.maps.ItemizedOverlay.setFocus(ItemizedOverlay.java:365) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.google.android.maps.ItemizedOverlay.focus(ItemizedOverlay.java:539) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.google.android.maps.ItemizedOverlay.onTap(ItemizedOverlay.java:455) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.knowithk.kpass.taxifare.MyMap$InterestingLocations.onTap(MyMap.java:333) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.google.android.maps.OverlayBundle.onTap(OverlayBundle.java:83) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.google.android.maps.MapView$1.onSingleTapUp(MapView.java:356) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.google.android.maps.GestureDetector.onTouchEvent(GestureDetector.java:533) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.google.android.maps.MapView.onTouchEvent(MapView.java:683) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.view.View.dispatchTouchEvent(View.java:3938) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1733) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1151) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.app.Activity.dispatchTouchEvent(Activity.java:2096) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1717) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2215) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.view.ViewRoot.handleMessage(ViewRoot.java:1886) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.os.Handler.dispatchMessage(Handler.java:99) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.os.Looper.loop(Looper.java:130) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at android.app.ActivityThread.main(ActivityThread.java:3687) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at java.lang.reflect.Method.invokeNative(Native Method) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at java.lang.reflect.Method.invoke(Method.java:507) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
06-04 18:03:32.773: E/AndroidRuntime(29049): at dalvik.system.NativeStart.main(Native Method)

來源

2012-06-04 crystalWing

如果您發佈stacktrace（logcat中的錯誤），我們可以更容易地爲您提供幫助。 – Reinier

非常感謝您的建議。 – crystalWing

第333行的代碼是什麼？順便說一句，你可能想改變（p！= me2）爲（！p.equals（me2））。 – Reinier

改變你加入這個受保護的布爾中的onTap（INT指數）刪除竊聽項目的方式：

   mOverlays.remove(index); 
       setLastFocusedIndex(-1); 
       map.invalidate();

，它會解決你的問題。

順便說一句，我是唯一一個認爲ItemizedOverlay和OverlayItem類遭受糟糕設計的人嗎？

來源

2012-08-18 22:44:27

順便說一下。我也認爲他們遭受了糟糕的設計。除了MapActivity，MapView（僅限單個實例）和缺少MapFragment之外的所有限制。 – hendrix

Android的項目覆蓋！在地圖上放置並移除標記

回答

相關問題