從地圖疊加對話框中打開另一個活動

Question

我正在嘗試創建地圖應用程序，並且需要執行與Google地圖相似的操作。 我想打開顯示位置列表，當用戶點擊它們時，我想顯示一個對話框。

我能夠做到這裏。但是現在，當用戶點擊打開的對話框時，我想用他們點擊的那個項目的細節顯示另一個活動。

我試圖開始一個新的意圖，但它給了我一個錯誤。

下面是我在做什麼

private void drawPopupWindow(Canvas canvas,int index, MapView mapView, boolean shadow) { 

     OverlayItem item = mOverlays.get(index); 
     GeoPoint geoPoint = item.getPoint(); 

     LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

     LinearLayout dialogLayout = (LinearLayout)inflater.inflate(R.layout.location_dialog, null); 
     LayoutParams mapDialogParams = new LayoutParams(
       ViewGroup.LayoutParams.WRAP_CONTENT, 
       ViewGroup.LayoutParams.WRAP_CONTENT, 
       geoPoint, -1, -22, 
       LayoutParams.BOTTOM_CENTER); 
     mapView.addView(dialogLayout, mapDialogParams); 

     dialogLayout.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       Intent detailIntent = new Intent(mContext, ItemDetailView.class); 
       mContext.startActivity(detailIntent); // I passed the context from mapActivity 
      } 
     });  

    } 

這裏是堆棧跟蹤

> E/AndroidRuntime(4985): 
> java.lang.RuntimeException: Unable to 
> start activity 
> ComponentInfo{com.achie.test.mapssample/com.achie.test.mapssample.ItemDetailView}: 
> android.view.InflateException: Binary 
> XML file line #2: Error inflating 
> class <unknown> E/AndroidRuntime(
> 4985): at 
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
> E/AndroidRuntime(4985): at 
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 
> E/AndroidRuntime(4985): at 
> android.app.ActivityThread.access$2200(ActivityThread.java:119) 
> E/AndroidRuntime(4985): at 
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
> E/AndroidRuntime(4985): at 
> android.os.Handler.dispatchMessage(Handler.java:99) 
> E/AndroidRuntime(4985): at 
> android.os.Looper.loop(Looper.java:123) 
> E/AndroidRuntime(4985): at 
> android.app.ActivityThread.main(ActivityThread.java:4363) 
> E/AndroidRuntime(4985): at 
> java.lang.reflect.Method.invokeNative(Native 
> Method) E/AndroidRuntime(4985): at 
> java.lang.reflect.Method.invoke(Method.java:521) 
> E/AndroidRuntime(4985): at 
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
> E/AndroidRuntime(4985): at 
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
> E/AndroidRuntime(4985): at 
> dalvik.system.NativeStart.main(Native 
> Method) E/AndroidRuntime(4985): 
> Caused by: 
> android.view.InflateException: Binary 
> XML file line #2: Error inflating 
> class <unknown> E/AndroidRuntime(
> 4985): at 
> android.view.LayoutInflater.createView(LayoutInflater.java:513) 
> E/AndroidRuntime(4985): at 
> android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:565) 
> E/AndroidRuntime(4985): at 
> android.view.LayoutInflater.inflate(LayoutInflater.java:385) 
> E/AndroidRuntime(4985): at 
> android.view.LayoutInflater.inflate(LayoutInflater.java:320) 
> E/AndroidRuntime(4985): at 
> android.view.LayoutInflater.inflate(LayoutInflater.java:276) 
> E/AndroidRuntime(4985): at 
> com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198) 
> E/AndroidRuntime(4985): at 
> android.app.Activity.setContentView(Activity.java:1622) 
> E/AndroidRuntime(4985): at 
> com.achie.test.mapssample.ItemDetailView.onCreate(ItemDetailView.java:11) 
> E/AndroidRuntime(4985): at 
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
> E/AndroidRuntime(4985): at 
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
> E/AndroidRuntime(4985): ... 11 more 
> E/AndroidRuntime(4985): Caused by: 
> java.lang.reflect.InvocationTargetException 
> E/AndroidRuntime(4985): at 
> com.google.android.maps.MapView.<init>(MapView.java:238) 
> E/AndroidRuntime(4985): at 
> java.lang.reflect.Constructor.constructNative(Native 
> Method) E/AndroidRuntime(4985): at 
> java.lang.reflect.Constructor.newInstance(Constructor.java:446) 
> E/AndroidRuntime(4985): at 
> android.view.LayoutInflater.createView(LayoutInflater.java:500) 
> E/AndroidRuntime(4985): ... 20 more 
> E/AndroidRuntime(4985): Caused by: 
> java.lang.IllegalArgumentException: 
> MapViews can only be created inside 
> instances of MapActivity. 
> E/AndroidRuntime(4985): at 
> com.google.android.maps.MapView.<init>(MapView.java:282) 
> E/AndroidRuntime(4985): at 
> com.google.android.maps.MapView.<init>(MapView.java:255) 
> E/AndroidRuntime(4985): ... 24 more 

爲什麼會出現這個錯誤，我怎麼能解決這個並打開一個新的活動？

此外，我可以在哪裏可以找到Android上谷歌地圖的源代碼？

謝謝。

Answer 1

由於堆棧跟蹤告訴您，「MapViews只能在MapActivity的實例內部創建。」您正嘗試在MapActivity之外創建MapView。更改您的代碼以避免這樣做，並且您將清除此錯誤。