圖層損壞 E/ArcGIS﹕ The map or layer has been destroyed or recycled. 資源未釋放

看到論壇上有個網友和我一樣的問題：

The map or layer has been destroyed or recyled

t

Hello,

I have a problem when the app restores after the map activity has been destroyed by the system.
The system calles OnDestroy on it's own, which is fine, but then, when i open the app back, everything restores (the app calles OnCreate again) except for the mapView Object.
When i try to add layers to the mapView i get the following message:

"The map or layer has been destroyed or recyled"

Does anybody had the same problem?
Any clues how to fix this?

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我這邊的詳細問題是：

地圖的Activity onDestroy()後，在重新打開app的時候就報 The map or layer has been destroyed or recycled.錯誤，然後地圖能顯示

但是數據丟了..

原來的destroy()

@Override
	protected void onDestroy() {
		featureLayers.clear();
		mMapView.destroyDrawingCache();
		try {
			unregisterReceiver(receiver);
		}
		catch (Exception e){
			e.printStackTrace();
		}
		try {
			unregisterReceiver(receiver2);
		}
		catch (Exception e){
			e.printStackTrace();
		}
		//結束服務，如果想讓服務一直運行就註銷此句
		try {
			stopService(new Intent(this, LocationService.class));
		}
		catch (Exception e){
			e.printStackTrace();
		}
		super.onDestroy();

	}

//初始化數據圖層
	private void initializeRoutingAndGeocoding() {
				for(int i=0;i<allfloor;i++) {
					Geodatabase geodatabase = null;
					try {
						geodatabase = new Geodatabase(geofilename[i]);
						List<GeodatabaseFeatureTable> table = geodatabase.getGeodatabaseTables();
						Log.i("zjx", "list:" + table);

						GeodatabaseFeatureTable mytable;
						if(i==1)mytable = geodatabase.getGeodatabaseFeatureTableByLayerId(0);
						else mytable= geodatabase.getGeodatabaseFeatureTableByLayerId(1);

						Log.i("zjx","mytable:"+mytable);
						featureLayers.add(new FeatureLayer(mytable));  //問題出在這
						// Attempt to load the local geocoding and routing data
						mMapView.addLayer(featureLayers.get(i));      //之前的資源沒有釋放(list.clear()),get(i)並不是新增的
					} catch (FileNotFoundException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
				trygetDataName();
	}

所以在onDestroy 裏面加一下釋放所有資源的函數，以前一直以爲java會自己快速回收的= =

，

esri論壇sso不能登錄，希望那個外國網友能看到這文章把~