如何在Android圆形视图中显示字母表

public class CircularAlphabetView extends View {
    private static final String ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    private static final int ALPHABET_COUNT = ALPHABET.length();
    
    private Paint backgroundPaint;
    private Paint textPaint;
    private RectF circleBounds;
    
    public CircularAlphabetView(Context context) {
        super(context);
        init();
    }
    
    public CircularAlphabetView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    
    private void init() {
        // 初始化背景画笔
        backgroundPaint = new Paint();
        backgroundPaint.setColor(Color.BLUE);
        backgroundPaint.setStyle(Paint.Style.FILL);
        
        // 初始化字母画笔
        textPaint = new Paint();
        textPaint.setColor(Color.WHITE);
        textPaint.setTextSize(40);
        textPaint.setTextAlign(Paint.Align.CENTER);
        
        // 初始化圆形边界
        circleBounds = new RectF();
    }
    
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        
        // 获取视图的宽度和高度
        int viewWidth = getWidth();
        int viewHeight = getHeight();
        
        // 计算圆形边界
        int diameter = Math.min(viewWidth, viewHeight);
        int radius = diameter / 2;
        int centerX = viewWidth / 2;
        int centerY = viewHeight / 2;
        circleBounds.set(centerX - radius, centerY - radius, centerX + radius, centerY + radius);
        
        // 绘制圆形背景
        canvas.drawOval(circleBounds, backgroundPaint);
        
        // 计算每个字母的角度
        float angle = 360f / ALPHABET_COUNT;
        
        // 绘制字母
        for (int i = 0; i < ALPHABET_COUNT; i++) {
            float letterAngle = i * angle;
            float letterX = (float) (centerX + radius * Math.cos(Math.toRadians(letterAngle)));
            float letterY = (float) (centerY + radius * Math.sin(Math.toRadians(letterAngle)));
            canvas.drawText(String.valueOf(ALPHABET.charAt(i)), letterX, letterY, textPaint);
        }
    }
}

<com.example.circularalphabetview.CircularAlphabetView
    android:layout_width="200dp"
    android:layout_height="200dp" />