根据设备宽高设置View的大小

得到设备屏幕宽高：

WindowManager wManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);        
Display display = wManager.getDefaultDisplay();        
int width = display.getWidth();        
int height = display.getHeight();

设置View大小：

LayoutParams lp = mView.getLayoutParams();
lp.width = width/2;
lp.height = height/3;
mView.setLayoutParams(lp);