Android中继承ViewGroup类控件，实现onMeasure和onLayout

onMeasure 用来设置子View的宽和高，设置自己的宽和高

 protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec) {
        // TODO Auto-generated method stub
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (!once ) {
     //通过getChildAt来获取子View
          LinearLayout vg = (LinearLayout) this.getChildAt(0);
           mMenu = (ViewGroup) vg.getChildAt(0);
           mContent = (ViewGroup) vg.getChildAt(1);
           /**
           * mMenu.getLayoutParams().width 用来给子View设置宽度
           * mScreenWidth 通过构造方法获得
           * WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
             DisplayMetrics outMetrics = new DisplayMetrics();
             wm.getDefaultDisplay().getMetrics(outMetrics);
             mScreenWidth = outMetrics.widthPixels;
           */
           mMenuWidth = mMenu .getLayoutParams().width = mScreenWidth;
             
           mContent.getLayoutParams(). width= mScreenWidth;
           once = true;
       }
 }

onLayout 用来设置View的位置

 protected void onLayout(boolean changed, int l, int t, int r, int b) {
    // TODO Auto-generated method stub
    super.onLayout(changed, l, t, r, b);
    if (changed) {
       this.scrollTo(mMenuWidth , 0);
   }
 }

Android中继承ViewGroup类控件，实现onMeasure和onLayout

Android中继承ViewGroup类控件，实现onMeasure和onLayout

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