爲什麼我們不能在customview初始化時將視圖充氣到customview？

Question

我創建了一個名爲PinView的自定義視圖，該視圖從RelativeLayout擴展而來。 在構造函數中，我調用了我的init（）方法，它從佈局膨脹了一個視圖。

inflate(getContext(), R.layout.layout_pin_view, this); 

這個充氣流之後，我需要通過請求addView在這個充氣視圖來添加我的其他意見（ImageView的），（）。並拋出：

catch (NoSuchMethodException e) { 
      InflateException ie = new InflateException(attrs.getPositionDescription() 
        + ": Error inflating class " 
        + (prefix != null ? (prefix + name) : name)); 
      ie.initCause(e); 
      throw ie; 

我可以successly膨脹：

mLlPins.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
      @Override 
      public void onGlobalLayout() { 
       mLlPins.getViewTreeObserver().removeOnGlobalLayoutListener(this); 
       .... 
       .... 
       addView(...) 



      } 
     }); 

你有一個想法，爲什麼我們不能創建一個同步膨脹的動態視圖？

我的部分代碼：

private void init() { 
    View view = inflate(getContext(), R.layout.layout_pin_view, this); 
    mEtPin = (PinEditText) view.findViewById(R.id.etPin); 
    mLlPins = (LinearLayout) view.findViewById(R.id.llPins); 
    mEtPin.setVisibility(View.VISIBLE); 
    mEtPin.setFilters(new InputFilter[]{new InputFilter.LengthFilter(mMaxLength)}); 
    mEtPin.setOnTouchListener(new OnTouchListener() { 
     @Override 
     public boolean onTouch(View v, MotionEvent event) { 
      return false; 
     } 
    }); 
    mEtPin.addTextChangedListener(new TextWatcher() { 
     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

     } 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 

     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      if (mImageViews != null) { 
       for (int i = 0; i < mImageViews.length; i++) 
        mImageViews[i].setEnabled(i < s.length()); 
       if (s.length() == mMaxLength) { 
        InputMethodManager imm = (InputMethodManager) mEtPin.getContext().getSystemService(
          Context.INPUT_METHOD_SERVICE); 
        imm.hideSoftInputFromWindow(mEtPin.getWindowToken(), 0); 
       } 
      } 
     } 
    }); 
    mLlPins.setClickable(false); 
    mEtPin.setText(mEtPin.getText()); 

    mEtPin.addTextChangedListener(new TextWatcher() { 
     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

     } 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 

     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      if (mImageViews == null) return; 
      for (int i = 0; i < mMaxLength; i++) { 
       if (mImageViews[i] != null) { 
        if (i < s.length()) { 
         mImageViews[i].setImageAlpha(255); 
         continue; 
        } 
       } 
       mImageViews[i].setImageAlpha(0); 
      } 

     } 
    }); 

    setMaxLength(4); 
} 
private void setMaxLength(int maxLength) { 
    LayoutInflater inflater = LayoutInflater.from(mLlPins.getContext()); 
    mMaxLength = maxLength; 
    mEtPin.setFilters(new InputFilter[]{new InputFilter.LengthFilter(maxLength)}); 
    mImageViews = new ImageView[maxLength]; 
    mLlPins.removeAllViews(); 
    int totalContentLenght = mLlPins.getMeasuredWidth() - dpToPx((maxLength - 1) * mMargin); 
    int itemWidthHeight = totalContentLenght/maxLength; 
    int itemMargin = dpToPx(mMargin/2); 
    int itemPadding = (int) (itemWidthHeight * srcRatio); 
    for (int i = 0; i < maxLength; i++) { 
     mImageViews[i] = (ImageView) inflater.inflate(mPinImage, null); 
     mImageViews[i].setEnabled(false); 
     mImageViews[i].setPadding(itemPadding, itemPadding, itemPadding, itemPadding); 
     LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(itemWidthHeight, itemWidthHeight); 
     if (i == 0) { 
      params.setMargins(0, 0, itemMargin, 0); 
     } else if (i < maxLength - 1) { 
      params.setMargins(itemMargin, 0, itemMargin, 0); 
     } else { 
      params.setMargins(itemMargin, 0, 0, 0); 

     } 
     mImageViews[i].setImageAlpha(0); 
     mLlPins.addView(mImageViews[i], params); 

    } 

} 

Answer 1

在我的理解，你不能誇大，因爲父視圖的意見（說的集裝箱）未按這意味着它的所有的佈局參數沒有解決，當你添加一個視圖，由於容器尚未啓動，您的視圖無法計算其自己的視圖參數。 如果你想使用的容器onCreate方法內啓動子視圖的方法，你可以試試你的容器內以下創建方法：

containerVariable.post(new Runnable(){ 
    @Override 
    public void run(){ 
     // initiate your child view and add child view here 
    } 
});