首页 > 代码库 > 验证码颜色、字母、数字、线条、圆点、位置都随机，点击切换验证码
验证码颜色、字母、数字、线条、圆点、位置都随机，点击切换验证码
才刚刚开始写这种自定义控件，但是发现验证码完全可以不用自定义控件，自定义控件好像麻烦点，下面就来介绍了使用bitmap的形式显示验证码
这个起初我也不会，都是看大神们弄的， 我也就添了点东西，让验证码更多样，哈哈，废话不多说，上交代码了
第一步 ，创建一个类
1 public class CodeBitmap { 2 3 4 //随机数数组 5 private static final char[] CHARS = { 6 ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, 7 ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘, ‘h‘, ‘j‘, ‘k‘, ‘m‘, 8 ‘n‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘, ‘w‘, ‘x‘, ‘y‘, ‘z‘, 9 ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, 10 ‘N‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘ 11 }; 12 //padding值 13 private static final int BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15, BASE_PADDING_TOP = 30, RANGE_PADDING_TOP = 20; 14 //random word space and pading_top 15 private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT, 16 base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP; 17 private Random random = new Random(); 18 private String returncode; 19 private int painsize=40; 20 //线条数 21 int line_number=5; 22 private int padding_left, padding_top; 23 private static CodeBitmap bmpCode; 24 public static CodeBitmap getInstance() { 25 if(bmpCode == null) 26 bmpCode = new CodeBitmap(); 27 return bmpCode; 28 } 29 //验证码图片 30 public Bitmap cratebitmap(int width,int height) { 31 padding_left = 0; 32 Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); 33 Canvas canvas = new Canvas(bitmap); 34 //创建验证码 35 returncode = crateCode(); 36 canvas.drawColor(Color.WHITE); 37 38 Paint paint=new Paint(); 39 paint.setAntiAlias(true); 40 paint.setTextSize(painsize); 41 42 //画验证码 43 for (int i=0;i<returncode.length();i++) { 44 randomTextStyle(paint); 45 randomPadding(); 46 canvas.drawText(returncode.charAt(i) + "", padding_left, padding_top, paint); 47 } 48 //画线条 49 for (int i = 0; i < line_number; i++) { 50 drawLine(canvas, paint,width,height); 51 } 52 53 //画小圆点 54 for (int i=0;i<20;i++){ 55 drawpoint(canvas,paint,width,height); 56 } 57 canvas.save( Canvas.ALL_SAVE_FLAG );//保存 58 canvas.restore();// 59 return bitmap; 60 } 61 62 //画干扰线 63 private void drawLine(Canvas canvas, Paint paint,int width,int height) { 64 int color = randomColor(); 65 int startX = random.nextInt(width); 66 int startY = random.nextInt(height); 67 int stopX = random.nextInt(width); 68 int stopY = random.nextInt(height); 69 paint.setStrokeWidth(1); 70 paint.setColor(color); 71 canvas.drawLine(startX, startY, stopX, stopY, paint); 72 } 73 //画圆dian 74 private void drawpoint(Canvas canvas, Paint paint,int width,int height){ 75 int color = randomColor(); 76 paint.setStrokeWidth(1); 77 paint.setColor(color); 78 int[] rang=getPoint(height,width); 79 canvas.drawCircle(rang[0], rang[1],random.nextInt(5),paint); 80 } 81 // 随机产生点的圆心点坐标 82 public static int[] getPoint(int height, int width) { 83 int[] tempCheckNum = { 0, 0, 0, 0 }; 84 tempCheckNum[0] = (int) (Math.random() * width); 85 tempCheckNum[1] = (int) (Math.random() * height); 86 return tempCheckNum; 87 } 88 //随机生成文字样式，颜色，粗细，倾斜度 89 private void randomTextStyle(Paint paint) { 90 int color = randomColor(); 91 paint.setColor(color); 92 paint.setFakeBoldText(random.nextBoolean()); //true为粗体，false为非粗体 93 float skewX = random.nextInt(11) / 10; 94 skewX = random.nextBoolean() ? skewX : -skewX; 95 paint.setTextSkewX(skewX); //float类型参数，负数表示右斜，整数左斜 96 //paint.setUnderlineText(true); //true为下划线，false为非下划线 97 //paint.setStrikeThruText(true); //true为删除线，false为非删除线 98 } 99 //随机生成颜色 100 private int randomColor() { 101 return randomColor(1); 102 } 103 104 private int randomColor(int rate) { 105 int red = random.nextInt(256) / rate; 106 int green = random.nextInt(256) / rate; 107 int blue = random.nextInt(256) / rate; 108 return Color.rgb(red, green, blue); 109 } 110 //随机生成padding值 111 private void randomPadding() { 112 padding_left += base_padding_left + random.nextInt(range_padding_left); 113 padding_top = base_padding_top + random.nextInt(range_padding_top); 114 } 115 //生成验证码 116 private String crateCode() { 117 StringBuffer returnbf = new StringBuffer(); 118 for (int i = 0; i < 4; i++) { 119 returnbf.append(CHARS[random.nextInt(CHARS.length)]); 120 } 121 return returnbf.toString(); 122 } 123 124 //获取验证码的值 125 public String getcode(){ 126 return returncode; 127 } 128 }
第二步，调取类中cratebitmap的方法，显示图片就可以啦
先看mainactivity布局
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="match_parent" 3 android:layout_height="match_parent" 4 android:orientation="vertical" > 5 6 <LinearLayout 7 android:layout_width="match_parent" 8 android:layout_height="wrap_content" 9 android:layout_marginLeft="15dp" 10 android:layout_marginRight="15dp" 11 android:layout_marginTop="20dp" 12 android:orientation="horizontal" > 13 <LinearLayout 14 android:layout_width="wrap_content" 15 android:layout_height="40dp" 16 > 17 <EditText 18 android:id="@+id/et_phoneCodes" 19 android:layout_width="match_parent" 20 android:layout_height="match_parent" 21 android:layout_marginLeft="10dp" 22 android:layout_marginRight="10dp" 23 android:background="@null" 24 android:hint="请输入右侧验证码" /> 25 </LinearLayout> 26 27 <ImageView 28 android:id="@+id/iv_showCode" 29 android:layout_width="120dp" 30 android:layout_marginLeft="10dp" 31 android:layout_height="60dp" /> 32 33 </LinearLayout> 34 35 <Button 36 android:id="@+id/but_forgetpass_toSetCodes" 37 android:layout_width="match_parent" 38 android:layout_height="wrap_content" 39 android:layout_margin="20dp" 40 android:text="验 证" 41 /> 42 43 </LinearLayout>
再看看mainActivity
1 public class MainActivity extends AppCompatActivity { 2 3 private Button button; 4 private EditText dode; 5 private ImageView iv_showCode; 6 private String realcode; 7 //设置图片大小 8 private static final int DEFAULT_WIDTH = 120, DEFAULT_HEIGHT = 60; 9 private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT; 10 @Override 11 protected void onCreate(Bundle savedInstanceState) { 12 super.onCreate(savedInstanceState); 13 setContentView(R.layout.activity_main); 14 initview(); 15 } 16 private void initview(){ 17 button = (Button) findViewById(R.id.but_forgetpass_toSetCodes); 18 dode = (EditText)findViewById(R.id.et_phoneCodes); 19 iv_showCode = (ImageView)findViewById(R.id.iv_showCode); 20 iv_showCode.setImageBitmap(CodeBitmap.getInstance().cratebitmap(width,height)); 21 realcode = CodeBitmap.getInstance().getcode().toLowerCase(); 22 iv_showCode.setOnClickListener(new View.OnClickListener() { 23 @Override 24 public void onClick(View v) { 25 iv_showCode.setImageBitmap(CodeBitmap.getInstance().cratebitmap(width,height)); 26 realcode = CodeBitmap.getInstance().getcode().toLowerCase(); 27 } 28 }); 29 button.setOnClickListener(new View.OnClickListener() { 30 @Override 31 public void onClick(View v) { 32 String editcode=dode.getText().toString().trim(); 33 if (editcode.equals(realcode)){ 34 Toast.makeText(MainActivity.this,"验证码输入正确！",Toast.LENGTH_SHORT).show(); 35 }else { 36 Toast.makeText(MainActivity.this,"验证码错误，请重新输入！",Toast.LENGTH_SHORT).show(); 37 } 38 } 39 }); 40 } 41 }
验证码颜色、字母、数字、线条、圆点、位置都随机，点击切换验证码
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