android 获取屏幕宽高

1.获取屏幕宽高（忽略虚拟按键）：
//wyn add
private static DisplayMetrics getDM(Context context){
Display display = ((Camera)context).getWindowManager().getDefaultDisplay();
DisplayMetrics dm = new DisplayMetrics();
@SuppressWarnings("rawtypes")
Class c;
try {
c = Class.forName("android.view.Display");
@SuppressWarnings("unchecked")
Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);
method.invoke(display, dm);
} catch (Exception e) {
e.printStackTrace();
}
return dm;
}

DisplayMetrics metrics = getDM(context);
            double fullscreen;
            if (metrics.widthPixels > metrics.heightPixels) {
                fullscreen = (double)metrics.widthPixels / metrics.heightPixels;
            } else {
                fullscreen = (double)metrics.heightPixels / metrics.widthPixels;
            }

2.获取屏幕宽高（不忽略虚拟按键）：

DisplayMetrics metrics = context.getResources().getDisplayMetrics();
            double fullscreen;
            if (metrics.widthPixels > metrics.heightPixels) {
                fullscreen = (double)metrics.widthPixels / metrics.heightPixels;
            } else {
                fullscreen = (double)metrics.heightPixels / metrics.widthPixels;
            }