Android 获取屏幕高度、宽度

参考：https://www.jianshu.com/p/1a931d943fb4

@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
    public String  getPingMu4(){
    
    
        Point outSize = new Point();
        getWindowManager().getDefaultDisplay().getRealSize(outSize);
        int x = outSize.x;
        int y = outSize.y;
        return "x = " + x + ",y = " + y;
    }

    public String  getPingMu3(){
    
    
        Rect outSize = new Rect();
        getWindowManager().getDefaultDisplay().getRectSize(outSize);
        int left = outSize.left;
        int top = outSize.top;
        int right = outSize.right;
        int bottom = outSize.bottom;
        return "left = " + left + ",top = " + top + ",right = " + right + ",bottom = " + bottom;
    }


    public String  getPingMu2(){
    
    
        Display defaultDisplay = getWindowManager().getDefaultDisplay();
        Point point = new Point();
        defaultDisplay.getSize(point);
        int x = point.x;
        int y = point.y;
        return  x + " * " + y;
    }


    public static float getPingMu1(Context mContext) {
    
     int densityDpi = mContext.getResources().getDisplayMetrics().densityDpi;
        float scaledDensity = mContext.getResources().getDisplayMetrics().scaledDensity;
        float density = mContext.getResources().getDisplayMetrics().density;
        float xdpi = mContext.getResources().getDisplayMetrics().xdpi;
        float ydpi = mContext.getResources().getDisplayMetrics().ydpi;
        int width = mContext.getResources().getDisplayMetrics().widthPixels;
        int height = mContext.getResources().getDisplayMetrics().heightPixels;

        // 这样可以计算屏幕的物理尺寸
        float width2 = (width / xdpi)*(width / xdpi);
        float height2 = (height / ydpi)*(width / xdpi);

        return (float) Math.sqrt(width2+height2);
    }

	DisplayMetrics dm = getResources().getDisplayMetrics();         //实例化显示指标对象
    int displayWidth = dm.widthPixels;      //得到屏幕宽度
    int displayHeight = dm.heightPixels;    //得到屏幕高度