安卓画一个白底红边的圆形背景

好的，我可以帮你生成一段代码来绘制一个白底红边的圆形背景。请注意，以下代码仅提供一个简单的示例，你可能需要根据自己的需求进行适当的调整。

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;

public class CircleBackgroundView extends View {

    private Paint circlePaint;
    private Paint borderPaint;

    public CircleBackgroundView(Context context) {
        super(context);
        init();
    }

    private void init() {
        circlePaint = new Paint();
        circlePaint.setColor(Color.WHITE);
        circlePaint.setAntiAlias(true);

        borderPaint = new Paint();
        borderPaint.setColor(Color.RED);
        borderPaint.setAntiAlias(true);
        borderPaint.setStyle(Paint.Style.STROKE);
        borderPaint.setStrokeWidth(5);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        int centerX = getWidth() / 2;
        int centerY = getHeight() / 2;
        int radius = Math.min(centerX, centerY);

        canvas.drawCircle(centerX, centerY, radius, circlePaint);
        canvas.drawCircle(centerX, centerY, radius - borderPaint.getStrokeWidth() / 2, borderPaint);
    }
}

你可以在你的布局文件中使用这个自定义的视图：

<LinearLayout
    ...
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    ...

    <com.example.yourpackage.CircleBackgroundView
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:background="@android:color/transparent" />

    ...

</LinearLayout>

请将 `com.example.yourpackage` 替换为你的包名，然后将 `CircleBackgroundView` 放在你希望显示圆形背景的位置。