安卓自定义签名组件

public class SignatureView extends View {

    private Path signaturePath;
    private Paint signaturePaint;
    private int signatureColor;
    private float signatureStrokeWidth;

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

    public SignatureView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public SignatureView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        // 初始化路径和画笔
        signaturePath = new Path();

        signatureColor = Color.BLACK;
        signatureStrokeWidth = 5f;

        signaturePaint = new Paint();
        signaturePaint.setColor(signatureColor);
        signaturePaint.setStyle(Paint.Style.STROKE);
        signaturePaint.setStrokeWidth(signatureStrokeWidth);
        signaturePaint.setAntiAlias(true);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        // 绘制签名路径
        canvas.drawPath(signaturePath, signaturePaint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float xPos = event.getX();
        float yPos = event.getY();

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                signaturePath.moveTo(xPos, yPos);
                return true;
            case MotionEvent.ACTION_MOVE:
                signaturePath.lineTo(xPos, yPos);
                break;
            case MotionEvent.ACTION_UP:
                // 滑动结束时的操作（如果有）
                break;
        }

        // 重新绘制视图
        invalidate();
        return true;
    }

    // 清除签名
    public void clearSignature() {
        signaturePath.reset();
        invalidate();
    }

    //获取签名位图
    public Bitmap getSignatureBitmap() {
        Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        draw(canvas);
        return bitmap;
    }

    // 更改笔记颜色
    public void setSignatureColor(int color) {
        // 设置您想要的颜色
        signatureColor = color;
        signaturePaint.setColor(signatureColor);
        invalidate();
    }

    // 更改笔记大小
    public void setSignatureStrokeWidth(float width) {
        // 设置您想要的笔记宽度
        signatureStrokeWidth = width;
        signaturePaint.setStrokeWidth(signatureStrokeWidth);
        invalidate();
    }
}

调用方法

效果图