圆形进度条背景：Android Xamarin

我有一个圆形的进度条，它工作得很好。但是背景并没有出现，尽管我在xml可绘制文件中为“背景”指定了形状，并且进度从圆圈的右侧开始（如图所示）。我想让它从顶部开始

这是我的密码：

 <ProgressBar
        android:id="@+id/progressBarToday"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="50dip"
        android:layout_height="50dip"
        android:layout_centerInParent="true"
        android:indeterminate="false"
        android:max="60"
        android:progress="0"
        android:progressDrawable="@drawable/progressbar" />

为什么背景没有出现？我怎样才能从顶部开始取得进展

任何人请帮忙，谢谢。

我让它工作了

     <ProgressBar
            android:id="@+id/progressBarToday"
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_width="50dip"
            android:layout_height="50dip"
            android:layout_centerInParent="true"
            android:indeterminate="false"
            android:max="60"
            android:progress="0"
            android:background="@drawable/bg" // here is working background
            android:progressDrawable="@drawable/progressbar" />

---

要从顶部开始，可以使用“旋转”

---

您需要将以下属性添加到背景项：

android:useLevel="false"

像这样：

<?xml version="1.0" encoding="UTF-8" ?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@android:id/background"> <---not working!
    <shape
        android:innerRadiusRatio="3"
        android:shape="ring"
        android:useLevel="false"
        android:thicknessRatio="7.0">
        <solid android:color="@color/red"/>
    </shape>
  </item>
  <item android:id="@android:id/progress">
    <shape
        android:innerRadiusRatio="3"
        android:shape="ring"
        android:thicknessRatio="7.0">
        <solid android:color="@color/blue"/>
    </shape>
  </item>
</layer-list>

是的，我来晚了，但这可能会帮助其他人。
此代码将返回位图图像，可以在ImageView或ImageButton中使用

private Bitmap progressBar(int progress) {

       Bitmap bitmap = Bitmap.createBitmap(300, 300, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint();
        paint.setColor(Color.parseColor("#FF0000"));
        paint.setStrokeWidth(20);
        paint.setAntiAlias(true);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        canvas.drawCircle(150, 150, 140, paint);
        paint.setColor(Color.parseColor("#01aa01"));
        paint.setStrokeWidth(16);
        paint.setStyle(Paint.Style.STROKE);
        final RectF oval = new RectF();
        paint.setStyle(Paint.Style.FILL);
        oval.set(10, 10, 290, 290);
        canvas.drawArc(oval, 270, (progress * 360) / 100, true, paint);
        paint.setStrokeWidth(1);
        paint.setTextSize(100);
        paint.setTextAlign(Align.CENTER);
        paint.setColor(Color.parseColor("#ffffff"));
        canvas.drawText("" + progress, 150, 150 + (paint.getTextSize() / 3),
                paint);

    return bitmap;
}

是否有办法使进度条变厚？是的，更改厚度比android:thicknessRatio=“7.0“@Erma Isabel你能把@drawable/bg和@drawable/progressbar代码放进去吗。提前感谢
@drawable/bg
是一个图像、图片，而
@drawable/progressbar
是你在问题中可以看到的progressbar.xml文件。你在哪里定义progressBarStyleHorizontal？我已经读了这么多文章，直到这篇文章之前都没有工作过，我已经查看了这个值，但文档并没有让我认为它与我的问题有关。我会很高兴得到澄清，如果你有它和感谢无论如何！
android:useLevel="false"

<?xml version="1.0" encoding="UTF-8" ?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@android:id/background"> <---not working!
    <shape
        android:innerRadiusRatio="3"
        android:shape="ring"
        android:useLevel="false"
        android:thicknessRatio="7.0">
        <solid android:color="@color/red"/>
    </shape>
  </item>
  <item android:id="@android:id/progress">
    <shape
        android:innerRadiusRatio="3"
        android:shape="ring"
        android:thicknessRatio="7.0">
        <solid android:color="@color/blue"/>
    </shape>
  </item>
</layer-list>

private Bitmap progressBar(int progress) {

       Bitmap bitmap = Bitmap.createBitmap(300, 300, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint();
        paint.setColor(Color.parseColor("#FF0000"));
        paint.setStrokeWidth(20);
        paint.setAntiAlias(true);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        canvas.drawCircle(150, 150, 140, paint);
        paint.setColor(Color.parseColor("#01aa01"));
        paint.setStrokeWidth(16);
        paint.setStyle(Paint.Style.STROKE);
        final RectF oval = new RectF();
        paint.setStyle(Paint.Style.FILL);
        oval.set(10, 10, 290, 290);
        canvas.drawArc(oval, 270, (progress * 360) / 100, true, paint);
        paint.setStrokeWidth(1);
        paint.setTextSize(100);
        paint.setTextAlign(Align.CENTER);
        paint.setColor(Color.parseColor("#ffffff"));
        canvas.drawText("" + progress, 150, 150 + (paint.getTextSize() / 3),
                paint);

    return bitmap;
}