將自定義方法放入自定義組件

Question

我有自定義組件擴展了LinearLayout。我需要爲此組件添加自定義方法的創建屬性。我需要在組件內部調用它。

像按鈕一樣。

<Button android:onClick="customMethod"/> 

如何解決？

Answer 1

縱觀View類的在Android源代碼的Java文件，你可以找到以下

  case R.styleable.View_onClick: 
       if (context.isRestricted()) { 
        throw new IllegalStateException("The android:onClick attribute cannot " 
          + "be used within a restricted context"); 
       } 

       final String handlerName = a.getString(attr); 
       if (handlerName != null) { 
        setOnClickListener(new OnClickListener() { 
         private Method mHandler; 

         public void onClick(View v) { 
          if (mHandler == null) { 
           try { 
            mHandler = getContext().getClass().getMethod(handlerName, 
              View.class); 
           } catch (NoSuchMethodException e) { 
            int id = getId(); 
            String idText = id == NO_ID ? "" : " with id '" 
              + getContext().getResources().getResourceEntryName(
               id) + "'"; 
            throw new IllegalStateException("Could not find a method " + 
              handlerName + "(View) in the activity " 
              + getContext().getClass() + " for onClick handler" 
              + " on view " + View.this.getClass() + idText, e); 
           } 
          } 

          try { 
           mHandler.invoke(getContext(), View.this); 
          } catch (IllegalAccessException e) { 
           throw new IllegalStateException("Could not execute non " 
             + "public method of the activity", e); 
          } catch (InvocationTargetException e) { 
           throw new IllegalStateException("Could not execute " 
             + "method of the activity", e); 
          } 
         } 
        }); 
       } 
       break; 

的getMethod方法應該是你在找什麼。

Answer 2

你有沒有看到這個帖子：

Android - Writing a custom (compound) component

可能是你正在尋找的答案。