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);
    }
});