按钮点击切换横屏和竖屏

//        横屏findViewById(R.id.heng).setOnClickListener(new OnClickListener() {    @Override    public void onClick(View v) {        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);    }});//        竖屏findViewById(R.id.shu).setOnClickListener(new OnClickListener() {    @Override    public void onClick(View v) {        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);    }});