// 方法1 Android获得屏幕的宽和高

//方法1
    WindowManager windowManager = getWindowManager();    
    Display display = windowManager.getDefaultDisplay();    
    int screenWidth = screenWidth = display.getWidth();    
    int screenHeight = screenHeight = display.getHeight();   

   // 方法2   
    DisplayMetrics dm = new DisplayMetrics();  
    getWindowManager().getDefaultDisplay().getMetrics(dm);  
    TextView tv = (TextView)this.findViewById(R.id.tv);  
    float width=dm.widthPixels*dm.density;   
    float height=dm.heightPixels*dm.density;