矩形形状有两种纯色

Question

我想创建一个带有两种纯色(水平)的矩形形状来实现这样的效果:

我听说过layer-list,虽然我可以使用它来包含两个不同颜色的矩形,但它似乎只是垂直放置形状.

有没有办法用lalyer-list实现这个目标,还是应该使用完全不同的东西？我想保持简单,能够在运行时更改形状颜色.

谢谢.

Answer 1

这肯定会根据您的要求绘制出形状:

<item>根据需要调整大小!

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:left="50dip">
        <shape
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:shape="rectangle" >
            <solid android:color="#0000FF" />
        </shape>
    </item>
    <item android:right="50dip">
        <shape
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:shape="rectangle" >
            <solid android:color="#ff0000" />
        </shape>
    </item>

</layer-list>

Answer 2

您可以为此创建自定义drawable.只需扩展Drawable类.

下面是一个示例代码,可以绘制一个你想要的矩形,你可以提供任意数量的颜色.

public class ColorBarDrawable extends Drawable {

    private int[] themeColors;

    public ColorBarDrawable(int[] themeColors) {
        this.themeColors = themeColors;
    }

    @Override
    public void draw(Canvas canvas) {

        // get drawable dimensions
        Rect bounds = getBounds();

        int width = bounds.right - bounds.left;
        int height = bounds.bottom - bounds.top;

        // draw background gradient
        Paint backgroundPaint = new Paint();
        int barWidth = width / themeColors.length;
        int barWidthRemainder = width % themeColors.length;
        for (int i = 0; i < themeColors.length; i++) {
            backgroundPaint.setColor(themeColors[i]);
            canvas.drawRect(i * barWidth, 0, (i + 1) * barWidth, height, backgroundPaint);
        }

        // draw remainder, if exists
        if (barWidthRemainder > 0) {
            canvas.drawRect(themeColors.length * barWidth, 0, themeColors.length * barWidth + barWidthRemainder, height, backgroundPaint);
        }

    }

    @Override
    public void setAlpha(int alpha) {
    }

    @Override
    public void setColorFilter(ColorFilter cf) {

    }

    @Override
    public int getOpacity() {
        return PixelFormat.OPAQUE;
    }

}