获取屏幕宽度和高度

public class MainActivity extends Activity{    float screenWidth;    float screenHeight;    Display display;    Point size;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        display = getWindowManager().getDefaultDisplay();        size = new Point();        display.getSize(size);        screenWidth = size.x;        screenHeight = size.y;    }

如果不是在Activity中（比如在View中需要得到）以上数据时，无法直接getWimdowManager()得到WimdowManager，可以通过

WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);

之后完全一致。