android 动态设置控件宽度，比例等

 private void getScreenInfo() {
        ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) mDocCateFl.getLayoutParams();
        int margin = 0;
        int padding = 0;
        margin = lp.leftMargin;
        padding = mDocCateFl.getPaddingLeft();
        mItemWidth = (PhoneUtil.getScreenWidth(getContext())-(2*margin) - (2*padding)) / 4 ;
    }

	/**
	 * 获取屏幕宽度；
	 */
	public static int getScreenWidth(Context context) {
		return context.getApplicationContext().getResources()
				.getDisplayMetrics().widthPixels;
	}

  LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(mItemWidth, LinearLayout.LayoutParams.WRAP_CONTENT);
  vh.titleTv.setLayoutParams(params);