android - 单击按钮时将图像向左/向右旋转一定角度

Question

使用 picasso-transformations 库进行图像编辑。有两个单独的按钮用于左旋转和右旋转。单击按钮时，图像仅旋转一次。我想在每次单击按钮时将图像旋转到其各自的方向。

 recyclerView.addOnItemTouchListener(new RecyclerClick(act, recyclerView, new RecyclerClickListener() {
            @Override
            public void onClick(View view, final int position) {
                switch (position) {
                    case 0:
                        Picasso.with(act)
                                .load(selectedPhotoUri)
                                .rotate(90f)
                                .into(photo);
                        break;
                    case 1:
                        Picasso.with(act)
                                .load(selectedPhotoUri)
                                .rotate(90f)
                                .into(photo);
                        break;
                }
            }

Answer 1

也许实例变量有帮助。

像这样:

recyclerView.addOnItemTouchListener(new RecyclerClick(act, recyclerView, new RecyclerClickListener() {

    int rotate = 0;

    @Override
    public void onClick(View view, final int position) {
        switch (position) {
            case 0:
                rotate += 90f
                break;
            case 1:
                rotate -= 90f;
                break;
        }
        Picasso.with(act)
                .load(selectedPhotoUri)
                .rotate(rotate)
                .into(photo);
    }
}));