动态设置LinearLayout的高度，获取手机屏幕的大小

layout=(LinearLayout) findViewById(R.id.llayout_txt_bg);

		WindowManager wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
		int width = wm.getDefaultDisplay().getWidth();//屏幕宽度
		int height = wm.getDefaultDisplay().getHeight();//屏幕高度
		LinearLayout.LayoutParams lp=(LinearLayout.LayoutParams)layout.getLayoutParams();	
		if (height>800) {
			lp.height=(height*9)/11;
			layout.setLayoutParams(lp);
		}layout=(LinearLayout) findViewById(R.id.llayout