Android监听数据库中某个变化

public void initContentObserver() {
        UpdateHelper.getContext().getContentResolver().registerContentObserver(Settings.Global.getUriFor("xxx"), false, new ContentObserver(new Handler()) {
            @Override
            public void onChange(boolean selfChange) {
                super.onChange(selfChange);
        		//变化时执行相关逻辑
            }
        });
        UpdateHelper.getContext().getContentResolver().registerContentObserver(Settings.Global.getUriFor("xxx"), false, new ContentObserver(new Handler()) {
            @Override
            public void onChange(boolean selfChange) {
                super.onChange(selfChange);
                //变化时执行相关逻辑
            }
        });
    }