Android实现屏幕背景的自动切换

1. 在drawable-mdpi文件夹中存放bg_v（竖屏背景图片）和bg_h（横屏背景图片）。

2. 

public class AndroidHelper {
    
    public AndroidHelper() {
        
    }
    //获取屏幕方向
    public static int ScreenOrient(Activity activity) {
        int orient = activity.getRequestedOrientation();
        if (orient != ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE && orient != ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {
            //宽<高为竖屏，反之为横屏
            WindowManager windowManager = activity.getWindowManager();
            Display display = windowManager.getDefaultDisplay();
            
            int screenWidth = display.getWidth();
            int screenHeight = display.getHeight();
            
            orient = screenWidth < screenHeight? ActivityInfo.SCREEN_ORIENTATION_PORTRAIT :
                ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
        }
        return orient;
    }
    
    public static void AutoBackground(Activity activity, View view, int bg_v, int bg_h) {
        
        int orient = ScreenOrient(activity);
        if (orient == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {//横屏
            view.setBackgroundResource(bg_h);
        }
        else {//竖屏
            view.setBackgroundResource(bg_v);
        }
    }

3. 在MainActivity的onCreate方法中实现

LinearLayout layout = (LinearLayout) findViewById(R.id.layout);
//背景自动适应
Utility.AndroidHelper.AutoBackground(this, layout, R.drawable.bg_v, R.drawable.bg_h);