android 得到显示屏总宽与高宽比

方式一：

WindowManager manager = this.getWindowManager();

DisplayMetrics outMetrics = new DisplayMetrics();

manager.getDefaultDisplay().getMetrics(outMetrics);

int width = outMetrics.widthPixels;

int height = outMetrics.heightPixels;

方式二：

Resources resources = this.getResources();

DisplayMetrics dm = resources.getDisplayMetrics();

float density = dm.density;

int width = dm.widthPixels;

int height = dm.heightPixels;