获取屏幕宽高

DisplayMetrics metrics=new DisplayMetrics();

        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        int height=metrics.heightPixels;//获取屏幕高
        int width=metrics.widthPixels;//获取屏幕宽
        //根据父布局设定宽高值
       ViewGroup.LayoutParams ll= (ViewGroup.LayoutParams) linearLayout.getLayoutParams();

        ll.width=width/3*2;

ll.height=100;

        linearLayout.setLayoutParams(ll);