<declare-styleable name="VerifyCode"> <attr name="codeTextSize" format="dimension"/> <attr name="codeBackground" format="color"/> <attr name="codeLength" format="integer"/> <attr name="isContainChar" format="boolean"/> <attr name="pointNum" format="integer"/> <attr name="linNum" format="integer"/> </declare-styleable>

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PointF;import android.graphics.Rect;import android.util.AttributeSet;import android.util.TypedValue;import android.view.MotionEvent;import android.view.View;import java.util.Random;/** * 類描述:自定義驗證碼 * 創建者：lb */public class VerifyCode extends View { private String mCodeText;//文本內容 private int mCodeTextSize;//文本大小 private int mCodeLength;//驗證碼長度 private int mCodeBackground;//背景色 private boolean isContainChar;//驗證碼是否包含字母 private int mPointNum;//干擾點數 private int mLineNum;//干擾線數 private Paint mPaint;//畫筆 private Rect mBound;//繪制范圍 private Bitmap bitmap;//驗證碼圖片 private static Random mRandom = new Random(); private static int mWidth;//控件的寬度 private static int mHeight;//控件的高度 public VerifyCode(Context context) { super(context); } public VerifyCode(Context context, AttributeSet attrs) { super(context, attrs); initAttrValues(context,attrs); initData(); } /** * 初始化屬性集合 * @param context * @param attrs */ private void initAttrValues(Context context, AttributeSet attrs){ // //獲取在AttributeSet中定義的 VerifyCode 中聲明的屬性的集合 TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.VerifyCode); //獲取TypeArray的長度 int count=typedArray.getIndexCount(); for (int i=0;i<count;i++){  //獲取此項屬性的ID  int index=typedArray.getIndex(i);  switch (index){  case R.styleable.VerifyCode_codeTextSize:   // 默認設置為16sp，TypeValue類 px轉sp 一個轉換類   mCodeTextSize =typedArray.getDimensionPixelSize(index,(int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));   break;  case R.styleable.VerifyCode_codeBackground:mCodeBackground=typedArray.getColor(index,Color.WHITE);   break;  case R.styleable.VerifyCode_codeLength:   mCodeLength=typedArray.getInteger(index,4);   break;  case R.styleable.VerifyCode_isContainChar:   isContainChar=typedArray.getBoolean(index,false);   break;  case R.styleable.VerifyCode_pointNum:   mPointNum=typedArray.getInteger(index,100);   break;  case R.styleable.VerifyCode_linNum:   mLineNum=typedArray.getInteger(index,3);   break;  } } //Recycles the TypedArray, to be re-used by a later caller //官方解釋：回收TypedArray 以便后面的使用者重用 typedArray.recycle(); } /** * 初始化數據 */ private void initData(){ mCodeText=getValidationCode(mCodeLength,isContainChar); mPaint=new Paint(); mPaint.setAntiAlias(true); mBound=new Rect(); //計算文字所在矩形，可以得到寬高 mPaint.getTextBounds(mCodeText,0, mCodeText.length(),mBound); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); //獲取控件寬高的顯示模式 int widthMode=MeasureSpec.getMode(widthMeasureSpec); int heightMode=MeasureSpec.getMode(heightMeasureSpec); //獲取寬高的尺寸值 固定值的寬度 int widthSize=MeasureSpec.getSize(widthMeasureSpec); int heightSize=MeasureSpec.getSize(heightMeasureSpec); //設置寬高默認為建議的最小寬高 int width= getDefaultSize(getSuggestedMinimumWidth(),widthMeasureSpec) ; int height=getDefaultSize(getSuggestedMinimumHeight(),heightMeasureSpec);// MeasureSpec父布局傳遞給后代的布局要求 包含 確定大小和三種模式// EXACTLY：一般是設置了明確的值或者是MATCH_PARENT// AT_MOST：表示子布局限制在一個最大值內，一般為WARP_CONTENT// UNSPECIFIED：表示子布局想要多大就多大，很少使用 if (widthMode==MeasureSpec.EXACTLY){  width=widthSize; }else{  mPaint.setTextSize(mCodeTextSize);  mPaint.getTextBounds(mCodeText,0,mCodeText.length(),mBound);  float textWidth=mBound.width();  int tempWidth=(int)(getPaddingLeft()+textWidth+getPaddingRight());  width=tempWidth; } if (heightMode == MeasureSpec.EXACTLY) {  height = heightSize; } else {  mPaint.setTextSize(mCodeTextSize);  mPaint.getTextBounds(mCodeText, 0, mCodeText.length(), mBound);  float textHeight = mBound.height();  int tempHeight = (int) (getPaddingTop() + textHeight + getPaddingBottom());  height = tempHeight; } //設置測量的寬高 setMeasuredDimension(width,height); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); mWidth=getWidth(); mHeight=getHeight(); if (bitmap==null){  bitmap=createBitmapValidate(); } canvas.drawBitmap(bitmap,0,0,mPaint); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()){  case MotionEvent.ACTION_DOWN:  refresh();  break; } return super.onTouchEvent(event); } /** * 創建圖片驗證碼 * @return */ private Bitmap createBitmapValidate(){ if(bitmap != null && !bitmap.isRecycled()){  //回收并且置為null  bitmap.recycle();  bitmap = null; } //創建圖片 Bitmap sourceBitmap=Bitmap.createBitmap(mWidth,mHeight, Bitmap.Config.ARGB_8888); //創建畫布 Canvas canvas=new Canvas(sourceBitmap); //畫上背景顏色 canvas.drawColor(mCodeBackground); //初始化文字畫筆 mPaint.setStrokeWidth(3f); mPaint.setTextSize(mCodeTextSize); //測量驗證碼字符串顯示的寬度值 float textWidth=mPaint.measureText(mCodeText); //畫上驗證碼 int length = mCodeText.length(); //計算一個字符的所占位置 float charLength = textWidth / length; for (int i = 1; i <= length; i++) {  int offsetDegree = mRandom.nextInt(15);  //這里只會產生0和1，如果是1那么正旋轉正角度，否則旋轉負角度  offsetDegree = mRandom.nextInt(2) == 1 ? offsetDegree : -offsetDegree;  //用來保存Canvas的狀態。save之后，可以調用Canvas的平移、放縮、旋轉、錯切、裁剪等操作。  canvas.save();  //設置旋轉  canvas.rotate(offsetDegree, mWidth / 2, mHeight / 2);  //給畫筆設置隨機顏色  mPaint.setARGB(255, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20,   mRandom.nextInt(200) + 20);  //設置字體的繪制位置  canvas.drawText(String.valueOf(mCodeText.charAt(i - 1)), (i - 1) * charLength+5,   mHeight * 4 / 5f, mPaint);  //用來恢復Canvas之前保存的狀態。防止save后對Canvas執行的操作對后續的繪制有影響。  canvas.restore(); } //重新設置畫筆 mPaint.setARGB(255, mRandom.nextInt(200) + 20, mRandom.nextInt(200) + 20,  mRandom.nextInt(200) + 20); mPaint.setStrokeWidth(1); //產生干擾效果1 －－ 干擾點 for (int i = 0; i < mPointNum; i++) {  drawPoint(canvas, mPaint); } //生成干擾效果2 －－ 干擾線 for (int i = 0; i < mLineNum; i++) {  drawLine(canvas, mPaint); } return sourceBitmap; } /** * 生成干擾點 */ private static void drawPoint(Canvas canvas, Paint paint) { PointF pointF = new PointF(mRandom.nextInt(mWidth) + 10, mRandom.nextInt(mHeight) + 10); canvas.drawPoint(pointF.x, pointF.y, paint); } /** * 生成干擾線 */ private static void drawLine(Canvas canvas, Paint paint) { int startX = mRandom.nextInt(mWidth); int startY = mRandom.nextInt(mHeight); int endX = mRandom.nextInt(mWidth); int endY = mRandom.nextInt(mHeight); canvas.drawLine(startX, startY, endX, endY, paint); } /** * 獲取驗證碼 * * @param length 生成隨機數的長度 * @param contains 是否包含字符串 * @return */ public String getValidationCode(int length,boolean contains) { String val = ""; Random random = new Random(); for (int i = 0; i < length; i++) {  if (contains){  //字母或數字  String code = random.nextInt(2) % 2 == 0 ? "char" : "num";  //字符串  if ("char".equalsIgnoreCase(code)) {   //大寫或小寫字母   int choice = random.nextInt(2) % 2 == 0 ? 65 : 97;   val += (char) (choice + random.nextInt(26));  } else if ("num".equalsIgnoreCase(code)) {   val += String.valueOf(random.nextInt(10));  }  }else{  val += String.valueOf(random.nextInt(10));  } } return val; } /** *判斷驗證碼是否一致 忽略大小寫 */ public Boolean isEqualsIgnoreCase(String CodeString) { return mCodeText.equalsIgnoreCase(CodeString); } /** * 判斷驗證碼是否一致 不忽略大小寫 */ public Boolean isEquals(String CodeString) { return mCodeText.equals(CodeString); } /** * 提供外部調用的刷新方法 */ public void refresh(){ mCodeText= getValidationCode(mCodeLength,isContainChar); bitmap = createBitmapValidate(); invalidate(); }}