requestWindowFeature(Window.FEATURE_NO_TITLE); 

必须放在setContentView(R.layout.main); 前面，否则会报错。 

全屏

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  WindowManager.LayoutParams.FLAG_FULLSCREEN); 

得到屏幕大小
Display display = getWindowManager().getDefaultDisplay(); 
Log.i("view" , "height:" +display.getHeight()); 
Log.i("view" , "width:" +display.getWidth());

Display display = getWindowManager().getDefaultDisplay();
Log.i("view", "height:"+display.getHeight());
Log.i("view","width:"+display.getWidth());

也可以将display的大小信息存到一个DisplayMetrics对象中，代码如下：

DisplayMetrics displayMetrics = new DisplayMetrics(); 
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics); 
Log.i("view" , "height" +displayMetrics.heightPixels); 
Log.i("view" , "width" +displayMetrics.widthPixels);

得到屏幕方向
Configuration config = getResources().getConfiguration();  
    if (config.orientation == Configuration.ORIENTATION_LANDSCAPE){  
            //横屏，比如 480x320
     }else if(config.orientation == Configuration.ORIENTATION_PORTRAIT){  
            //竖屏 ，标准模式 320x480
     }else if(config.hardKeyboardHidden == Configuration.KEYBOARDHIDDEN_NO){  
            //横屏，Android123提示物理键盘滑出了
     }else if(config.hardKeyboardHidden == Configuration.KEYBOARDHIDDEN_YES){  
            //竖屏，键盘隐藏了   
    }