关于View的属性

自定义动态设置View的大小属性

使用LayoutParams来设置view的宽高.

int textLen = AddShopActivity.mCategoryItemNames1[type][textPos].length();        final int dimension = (int) (getResources().getDimension(R.dimen.text_size));        int left = dimension * textLen                + (int) (getResources().getDimension(R.dimen.rl_left));        RelativeLayout.LayoutParams lp2 = new LayoutParams(left                + (int) (getResources().getDimension(R.dimen.rl_right)),                (int) (getResources().getDimension(R.dimen.rl_height)));        lp2.setMargins(0, (int) (getResources().getDimension(R.dimen.rl_top)),                0, (int) (getResources().getDimension(R.dimen.rl_top)));        mRL01.setLayoutParams(lp2);        mDeleteBt = (Button) mRLMain.findViewById(R.id.deletebt);        MarginLayoutParams marginsParams = new MarginLayoutParams(                mDeleteBt.getLayoutParams());        marginsParams.setMargins(left, 0, 0, 0);        RelativeLayout.LayoutParams lp = new LayoutParams(marginsParams);

ViewGroup内部View的图层关系

bar.bringToFront();

在辛显龙Blog中是这样解释的： Android中的ViewGroup是通过一个Array来保存其Children，当调用某个childView的bringToFront时，是将该childView放在其Parent的Array数组的最后，ViewGroup的dispatchDraw在draw时是按照Array从前往后依次调用drawChild的，这样最后一个childView就在最前面了。