创建圆角编程图层列表(Create layer list with rounded corners

我目前正在以下XML转换以编程方式创建，以便根据需要在整个项目中，我可以设置顶角和底角。它是有两个矩形简单的图层列表; 一个在另一个上面。我想用这个作为一些不同的看法背景，因此它是一个结果尺度很重要的。

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:bottom="20dp">
        <shape android:shape="rectangle" >
            <size android:height="20dp" />
            <solid android:color="#969595" />
            <corners
                android:radius = "0dp"
                android:topLeftRadius="5dp"
                android:topRightRadius="5dp" />
        </shape>
    </item>
    <item android:top="20dp">
        <shape android:shape="rectangle" >
            <size android:height="20dp" />
            <solid android:color="#7B7979" />
            <corners
                android:radius = "0dp"
                android:bottomLeftRadius="5dp"
                android:bottomRightRadius="5dp" />
        </shape>
    </item>
</layer-list>

这种方法的工作，但我需要一个单独的XML每个形状取决于我是否要在顶部，底部，两者或无边角圆润。

我在创建相同的绘制当前的尝试已经取得了不外乎两个矩形有一个在另一个之上。我无法弄清楚如何设置矩形的位置。我看不出有什么明显的变化，不管是什么形状的边界被设置为。任何建议将不胜感激。

// Usage: 
setBackgroundDrawable(new DualColorStateDrawable(0, 10f));

...

private final int topColorUnselected = Color.RED;
private final int bottomColorUnselected = Color.GREEN;
private final int topColorSelected = Color.YELLOW;
private final int bottomColorSelected = Color.BLUE;
private final int m_nZERO_RADIUS = 0;

class DualColorStateDrawable extends StateListDrawable
{
    public NYWTableViewCellStateDrawable(float topRadius, float bottomRadius){
        addState(new int[] { -android.R.attr.state_pressed }, 
                 createListWithSelectedState(false, topRadius, bottomRadius));
        addState(new int[] { android.R.attr.state_pressed }, 
                 createListWithSelectedState(true, topRadius, bottomRadius));   
    }

    public Drawable createListWithSelectedState(
        boolean isSelected, float topRadius, float bottomRadius){

        int topColor, bottomColor;

        if (isSelected) {
            topColor = topColorSelected;
            bottomColor = bottomColorSelected;
        } else {
            topColor = topColorUnselected;
            bottomColor = bottomColorUnselected;
        }

        int x = 10;
        int y = 10;
        int width = 20;
        int height = 20;

        RoundRectShape _rrsTopShape = 
            new RoundRectShape(getRadii(topRadius, m_nZERO_RADIUS), null, null);
        CustomShapeDrawable _csdTopShape = 
            new CustomShapeDrawable(_rrsTopShape, topColor);
        RoundRectShape _rrsBottomShape = 
            new RoundRectShape(getRadii(m_nZERO_RADIUS, bottomRadius), null, null);
        CustomShapeDrawable _csdBottomShape = 
            new CustomShapeDrawable(_rrsBottomShape, bottomColor);
        _csdBottomShape.setBounds(x, y, x + width, y + height);

        return new LayerDrawable(new Drawable[] {_csdTopShape, _csdBottomShape});
    }

    private float[] getRadii(float top, float bottom) 
    {
        return new float[] { top, top, //
                top, top, //
                bottom, bottom, //
                bottom, bottom //
        };
    }

    class CustomShapeDrawable extends ShapeDrawable {
        private final Paint fillpaint;

        public CustomShapeDrawable(Shape s, int fill) {
            super(s);
            fillpaint = new Paint(this.getPaint());
            fillpaint.setColor(fill);
        }

        @Override
        protected void onDraw(Shape shape, Canvas canvas, Paint paint) {
            shape.draw(canvas, fillpaint);
        }
    }
}

您正在寻找LayerDrawable的setLayerInset为了能够设置上述另一个矩形。

见下文：

float radius = 5.0f;

float[] m_arrfTopHalfOuterRadii = 
    new float[] {radius, radius, radius, radius, 0, 0, 0, 0};
float[] m_arrfBottomHalfOuterRadii = 
    new float[] {0, 0, 0, 0, radius, radius, radius, radius};

int m_nTopColor = Color.BLUE;
int m_nBottomColor = Color.CYAN;

int m_nCellHeight = 40;

public Drawable drawbg()
{
    RoundRectShape top_round_rect = 
        new RoundRectShape(m_arrfTopHalfOuterRadii, null, null);
    ShapeDrawable top_shape_drawable = new ShapeDrawable(top_round_rect);
    top_shape_drawable.getPaint().setColor(m_nTopColor); 

    RoundRectShape bottom_round_rect = 
        new RoundRectShape(m_arrfBottomHalfOuterRadii, null, null);
    ShapeDrawable bottom_shape_drawable = new ShapeDrawable(bottom_round_rect);
    bottom_shape_drawable.getPaint().setColor(m_nBottomColor);

    Drawable[] drawarray = {top_shape_drawable, bottom_shape_drawable};
    LayerDrawable layerdrawable = new LayerDrawable(drawarray);

    int _nHalfOfCellHeight = m_nCellHeight/2; 
    layerdrawable.setLayerInset(0, 0, 0, 0, _nHalfOfCellHeight); //top half
    layerdrawable.setLayerInset(1, 0, _nHalfOfCellHeight, 0, 0); //bottom half

    return layerdrawable;
}