Android自定义View实现随机验证码

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public class VerificationCodeView extends View {
 /**
 * 文本
 */
 private String mTitleText;
 /**
 * 文本的颜色
 */
 private int mTextColor;
 /**
 * 文本的大小
 */
 private int mTextSize;

 /**
 * 绘制时控制文本绘制的范围
 */
 private Rect mBound;
 /**
 * 初始化画笔
 */
 private Paint mTextPaint;
 private Paint mPointPaint;
 private Paint mPathPaint;
 /**
 * 干扰点坐标的集合
 */
 private ArrayList mPoints = new ArrayList();
 /**
 * 绘制贝塞尔曲线的路径集合
 */
 private ArrayList mPaths = new ArrayList();

 public VerificationCodeView(Context context) {
 this(context, null);
 }

 public VerificationCodeView(Context context, AttributeSet attributeSet) {
 this(context, attributeSet, 0);
 }

 public VerificationCodeView(Context context, AttributeSet attributeSet, int defStyle) {
 super(context, attributeSet, defStyle);
 TypedArray typedArray = context.getTheme().obtainStyledAttributes(attributeSet, R.styleable.VerificationCodeView, defStyle, 0);
 int size = typedArray.getIndexCount();
 for (int i = 0; i  set = new HashSet();
 while (set.size() <4) {
  int randomInt = random.nextInt(10);
  set.add(randomInt);
 }
 StringBuffer sb = new StringBuffer();
 for (Integer i : set) {
  sb.append("" + i);
 }

 return sb.toString();
 }
}

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@Override
 protected void onDraw(Canvas canvas) {
 initData();
 Random mRandom = new Random();
 //生成随机的背景颜色
 mTextPaint.setARGB(255, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20);
 canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mTextPaint);
 //生成随机的文字颜色
 mTextPaint.setARGB(255, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20);
 //将文字画在布局的中间
 canvas.drawText(mTitleText, getWidth() / 2 - mBound.width() / 2, getHeight() / 2 + mBound.height() / 2, mTextPaint);

 // 产生干扰效果1 -- 干扰点
 for (PointF pointF : mPoints) {
  mPointPaint.setARGB(255, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20);
  canvas.drawPoint(pointF.x, pointF.y, mPointPaint);
 }
 // 产生干扰效果2 -- 干扰线
 for (Path path : mPaths) {
  mPathPaint.setARGB(255, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20);
  canvas.drawPath(path, mPathPaint);
 }

 private void initData() {
 Random mRandom = new Random();
 // 获取控件的宽和高，此时已经测量完成
 int mHeight = getHeight();
 int mWidth = getWidth();
 mPoints.clear();
 // 生成干扰点坐标
 for (int i = 0; i <150; i++) {
  PointF pointF = new PointF(mRandom.nextInt(mWidth) + 10, mRandom.nextInt(mHeight) + 10);
  mPoints.add(pointF);
 }
 mPaths.clear();
 // 生成干扰线坐标
 for (int i = 0; i <2; i++) {
  Path path = new Path();
  int startX = mRandom.nextInt(mWidth / 3) + 10;
  int startY = mRandom.nextInt(mHeight / 3) + 10;
  int endX = mRandom.nextInt(mWidth / 2) + mWidth / 2 - 10;
  int endY = mRandom.nextInt(mHeight / 2) + mHeight / 2 - 10;
  path.moveTo(startX, startY);
  path.quadTo(Math.abs(endX - startX) / 2, Math.abs(endY - startY) / 2, endX, endY);
  mPaths.add(path);
 }
 }

 private void init() {
 // 初始化文字画笔
 /**
  * 获得绘制文本的宽和高
  */
 mTextPaint = new Paint();
 mTextPaint.setTextSize(mTextSize);

 mBound = new Rect();
 //获取到的存在mBound里面
 mTextPaint.getTextBounds(mTitleText, 0, mTitleText.length(), mBound);
 // 初始化干扰点画笔
 mPointPaint = new Paint();
 mPointPaint.setStrokeWidth(6);
 mPointPaint.setStrokeCap(Paint.Cap.ROUND); // 设置断点处为圆形
 // 初始化干扰线画笔
 mPathPaint = new Paint();
 mPathPaint.setStrokeWidth(5);
 mPathPaint.setColor(Color.GRAY);
 mPathPaint.setStyle(Paint.Style.STROKE); // 设置画笔为空心
 mPathPaint.setStrokeCap(Paint.Cap.ROUND); // 设置断点处为圆形
 }