Question

我试图在按下按钮时向按钮添加边框（笔划），然后在按下另一个按钮时删除笔划。问题是按钮保持按钮+笔划的大小而不是回到原始大小（没有笔划）

我的尝试代码如下所示：

front.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent event) {

            ShapeDrawable shapeDrawable = new ShapeDrawable();
            shapeDrawable.getPaint().setColor(Color.RED);
            shapeDrawable.getPaint().setStrokeWidth(30f);
            shapeDrawable.getPaint().setStyle(Paint.Style.STROKE);
            front.setBackgroundDrawable(shapeDrawable);

            return false;
        }
    });

    back.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent event) {

            ShapeDrawable shapeDrawable = new ShapeDrawable();
            shapeDrawable.getPaint().setColor(Color.GRAY);
            shapeDrawable.getPaint().setStrokeWidth(0f);
            shapeDrawable.getPaint().setStyle(Paint.Style.STROKE);
            front.setBackgroundDrawable(shapeDrawable);

            return false;
        }
    });

Answer 1

尝试将另一个按钮的背景drawable设置为null。另外，请注意你在第二种方法中犯了错误 - 你有front.setBackgroundDrawable(shapeDrawable);而不是back.setBackgroundDrawable(shapeDrawable);。您使用的工作代码：

front.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent event) {

        ShapeDrawable shapeDrawable = new ShapeDrawable();
        shapeDrawable.getPaint().setColor(Color.RED);
        shapeDrawable.getPaint().setStrokeWidth(30f);
        shapeDrawable.getPaint().setStyle(Paint.Style.STROKE);
        front.setBackgroundDrawable(shapeDrawable);
        back.setBackgroundDrawable(null);

        return false;
    }
});

back.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent event) {

        ShapeDrawable shapeDrawable = new ShapeDrawable();
        shapeDrawable.getPaint().setColor(Color.GRAY);
        shapeDrawable.getPaint().setStrokeWidth(0f);
        shapeDrawable.getPaint().setStyle(Paint.Style.STROKE);
        back.setBackgroundDrawable(shapeDrawable);
        front.setBackgroundDrawable(null);

        return false;
    }
});

Answer 2

我找到解决此问题的最佳方法是将背景颜色设置为所需的颜色，而不是将drawable null设置为。对于我上面的代码示例，我将以下代码恢复为灰色按钮：

front.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent event) {

        ShapeDrawable shapeDrawable = new ShapeDrawable();
        shapeDrawable.getPaint().setColor(Color.RED);
        shapeDrawable.getPaint().setStrokeWidth(30f);
        shapeDrawable.getPaint().setStyle(Paint.Style.STROKE);
        front.setBackgroundDrawable(shapeDrawable);
        back.setBackgroundColor(Color.GRAY);

        return false;
    }
});

back.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent event) {

        ShapeDrawable shapeDrawable = new ShapeDrawable();
        shapeDrawable.getPaint().setColor(Color.GRAY);
        shapeDrawable.getPaint().setStrokeWidth(0f);
        shapeDrawable.getPaint().setStyle(Paint.Style.STROKE);
        back.setBackgroundDrawable(shapeDrawable);
        front.setBackgroundColor(Color.GRAY);

        return false;
    }
});

将按钮添加到按钮后如何删除笔划

2 个答案: