在ListView的机器人圆角

问题描述

我用下面的形状为背景制作带圆角的ListView控件：

I have a ListView with rounded corners made using following shape as background:

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<solid android:color="#ffffff"/>
<corners android:bottomRightRadius="13px" android:bottomLeftRadius="13px" android:topLeftRadius="13px" android:topRightRadius="13px"/>
</shape>

问题在于选择。它是长方形状，所以选择第一个或最后一个项目时，边角不再四舍五入。我发现在过去的职位一个很好的解决方案，在http://www.anddev.org/view-layout-resource-problems-f27/rounded-corners-on-listview-t8193-15.html.问题是我不能让另一个类从ListView的继承。我如何应用此方法时，我唯一拥有的是参考现有的ListView？我之所以要做这种方式是布局从XML膨胀。

The problem lies in the selector. It's rectangle shaped, so when selecting first or last item the corners aren't rounded anymore. I've found a very nice solution in the last post at http://www.anddev.org/view-layout-resource-problems-f27/rounded-corners-on-listview-t8193-15.html. The problem is I can't make another class to inherit from ListView. How can I apply this method when the only thing I have is the reference to existing ListView? The reason I have to do it this way is that the layout is inflated from xml.

我在寻找这样的：

ListView lv = (ListView)findViewById(...);
lv.onSizeChanged = protected void onSizeChanged(int w, int h, int oldw, int oldh){ ... }

感谢

推荐答案

看起来像有比扩展的ListView类和XML使用它没有别的办法。这里的样品code：

Looks like there's no other way than extending the ListView class and using it in XML. Here's the sample code:

public class WListView extends LinearLayout
{
    // =================================================================
    // Variables
    // =================================================================
    private Path clipArea;

    // =================================================================
    // Public methods
    // =================================================================

    public WListView(Context context)
    {
        super(context);
    }

    public WListView(Context context, AttributeSet attr)
    {
        super(context, attr);
    }

    // =================================================================
    // Private methods
    // =================================================================


    @Override
    protected void onSizeChanged(int w, int h, int oldW, int oldH)
    {
        super.onSizeChanged(w, h, oldW, oldH);
        clipArea = new Path();
        RectF rect = new RectF(0, 0, w, h);

        int cornerRadius = 13; // we should convert px to dp here
        clipArea.addRoundRect(rect, cornerRadius, cornerRadius, Path.Direction.CW);
    }

    @Override
    protected void dispatchDraw(Canvas canvas)
    {
        canvas.save();
        canvas.clipPath(clipArea);
        super.dispatchDraw(canvas);
        canvas.restore();
    }
}

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