android获取屏幕的大小

        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);

        float density = dm.density; // 屏幕密度（像素比例：0.75/1.0/1.5/2.0）dpi
        int densityDPI = dm.densityDpi; // 屏幕密度（每寸像素：120/160/240/320）dpi
        float xdpi = dm.xdpi;
        float ydpi = dm.ydpi;
        LogUtil.i(TAG, "DisplayMetrics xdpi=" + xdpi + "; ydpi=" + ydpi);
        LogUtil.i(TAG, "DisplayMetrics density=" + density + "; "  + "densityDPI=" + densityDPI);

        int screenWidthPx = dm.widthPixels; // 屏幕宽px
        int screenHeightPx = dm.heightPixels; // 屏幕宽 px
        LogUtil.i(TAG, "screenWidth px=" + screenWidthPx + "; screenHeight px=" + screenHeightPx);
      

        int screenWidth = (int) (dm.widthPixels / density + 0.5f); // 屏幕宽 dip
        int screenHeight = (int) (dm.heightPixels / density + 0.5f); // 屏幕高 dip
        LogUtil.i(TAG, "screenWidth dip=" + screenWidth + "; screenHeight dip="+ screenHeight);