Android验证码
Android随机生成验证码,Android利用随机数绘制不规则的验证码,加强用户登录或者注册的安全性。
具体思路如下:
在一块固定宽高的画布上,画上固定个数的随机数字和字母,再画上固定条数的干扰线
3,在主界面生成随机数,校验验证码MainActivity.java:
具体思路如下:
在一块固定宽高的画布上,画上固定个数的随机数字和字母,再画上固定条数的干扰线
随机数和干扰线的颜色随机生成,随机数的样式随机生成。
界面效果如下:
1,生成随机数代码,Code.java:
- public class Code {
- //随机数数组
- private static final char[] CHARS = {
- '2', '3', '4', '5', '6', '7', '8', '9',
- 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm',
- 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
- 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
- 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
- };
- private static Code bmpCode;
- public static Code getInstance() {
- if(bmpCode == null)
- bmpCode = new Code();
- return bmpCode;
- }
- //default settings
- //验证码默认随机数的个数
- private static final int DEFAULT_CODE_LENGTH = 4;
- //默认字体大小
- private static final int DEFAULT_FONT_SIZE = 25;
- //默认线条的条数
- private static final int DEFAULT_LINE_NUMBER = 5;
- //padding值
- private static final int BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;
- //验证码的默认宽高
- private static final int DEFAULT_WIDTH = 100, DEFAULT_HEIGHT = 40;
- //settings decided by the layout xml
- //canvas width and height
- private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT;
- //random word space and pading_top
- private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT,
- base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP;
- //number of chars, lines; font size
- private int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;
- //variables
- private String code;
- private int padding_left, padding_top;
- private Random random = new Random();
- //验证码图片
- public Bitmap createBitmap() {
- padding_left = 0;
- Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
- Canvas c = new Canvas(bp);
- code = createCode();
- c.drawColor(Color.WHITE);
- Paint paint = new Paint();
- paint.setAntiAlias(true);
- paint.setTextSize(font_size);
- //画验证码
- for (int i = 0; i < code.length(); i++) {
- randomTextStyle(paint);
- randomPadding();
- c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);
- }
- //画线条
- for (int i = 0; i < line_number; i++) {
- drawLine(c, paint);
- }
- c.save( Canvas.ALL_SAVE_FLAG );//保存
- c.restore();//
- return bp;
- }
- public String getCode() {
- return code;
- }
- //生成验证码
- private String createCode() {
- StringBuilder buffer = new StringBuilder();
- for (int i = 0; i < codeLength; i++) {
- buffer.append(CHARS[random.nextInt(CHARS.length)]);
- }
- return buffer.toString();
- }
- //画干扰线
- private void drawLine(Canvas canvas, Paint paint) {
- int color = randomColor();
- int startX = random.nextInt(width);
- int startY = random.nextInt(height);
- int stopX = random.nextInt(width);
- int stopY = random.nextInt(height);
- paint.setStrokeWidth(1);
- paint.setColor(color);
- canvas.drawLine(startX, startY, stopX, stopY, paint);
- }
- //生成随机颜色
- private int randomColor() {
- return randomColor(1);
- }
- private int randomColor(int rate) {
- int red = random.nextInt(256) / rate;
- int green = random.nextInt(256) / rate;
- int blue = random.nextInt(256) / rate;
- return Color.rgb(red, green, blue);
- }
- //随机生成文字样式,颜色,粗细,倾斜度
- private void randomTextStyle(Paint paint) {
- int color = randomColor();
- paint.setColor(color);
- paint.setFakeBoldText(random.nextBoolean()); //true为粗体,false为非粗体
- float skewX = random.nextInt(11) / 10;
- skewX = random.nextBoolean() ? skewX : -skewX;
- paint.setTextSkewX(skewX); //float类型参数,负数表示右斜,整数左斜
- //paint.setUnderlineText(true); //true为下划线,false为非下划线
- //paint.setStrikeThruText(true); //true为删除线,false为非删除线
- }
- //随机生成padding值
- private void randomPadding() {
- padding_left += base_padding_left + random.nextInt(range_padding_left);
- padding_top = base_padding_top + random.nextInt(range_padding_top);
- }
- }
2,编写布局文件,activity_main.xml:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical" >
- <RelativeLayout
- android:layout_width="match_parent"
- android:layout_height="50dp"
- android:background="@color/main_color_white" >
- <TextView
- android:id="@+id/tv_title"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_centerInParent="true"
- android:text="找回密码"
- android:textColor="@color/loan_butBackground"
- android:textSize="20sp" />
- </RelativeLayout>
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="40dp"
- android:layout_marginTop="30dp"
- android:orientation="vertical"
- android:layout_marginLeft="15dp"
- android:layout_marginRight="15dp"
- android:background="@drawable/security_code_bg">
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:gravity="center_vertical"
- android:orientation="horizontal" >
- <TextView
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_marginLeft="20dp"
- android:layout_marginRight="20dp"
- android:text="中国+86"
- android:textColor="#A2CD5A"
- android:textSize="16sp" />
- <View
- android:layout_width="0.1dp"
- android:layout_height="match_parent"
- android:background="@color/loan_butBackground" />
- <EditText
- android:id="@+id/et_forgetPass_PhoneNum"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_marginLeft="20dp"
- android:background="@null"
- android:digits="0123456789"
- android:hint="请填入您的手机号"
- android:inputType="number"
- android:maxLength="11"
- android:textSize="16sp" />
- </LinearLayout>
- </LinearLayout>
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_marginLeft="15dp"
- android:layout_marginRight="15dp"
- android:layout_marginTop="20dp"
- android:orientation="horizontal" >
- <LinearLayout
- android:layout_width="wrap_content"
- android:layout_height="40dp"
- android:background="@drawable/security_code_bg" >
- <EditText
- android:id="@+id/et_phoneCodes"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:layout_marginLeft="10dp"
- android:layout_marginRight="10dp"
- android:background="@null"
- android:hint="请输入右侧验证码" />
- </LinearLayout>
- <ImageView
- android:id="@+id/iv_showCode"
- android:layout_width="100dp"
- android:layout_marginLeft="10dp"
- android:layout_height="match_parent" />
- </LinearLayout>
- <Button
- android:id="@+id/but_forgetpass_toSetCodes"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_margin="20dp"
- android:background="@drawable/buttonshape"
- android:text="提交验证码"
- android:textColor="@color/main_color_white" />
- </LinearLayout>
3,在主界面生成随机数,校验验证码MainActivity.java:
- public class MainActivity extends Activity implements OnClickListener {
- public static final String TAG = MainActivity.class.getName();
- private ImageView iv_showCode;
- private EditText et_phoneCode;
- private EditText et_phoneNum;
- //产生的验证码
- private String realCode;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- et_phoneCode = (EditText) findViewById(R.id.et_phoneCodes);
- Button but_toSetCode = (Button) findViewById(R.id.but_forgetpass_toSetCodes);
- but_toSetCode.setOnClickListener(this);
- iv_showCode = (ImageView) findViewById(R.id.iv_showCode);
- //将验证码用图片的形式显示出来
- iv_showCode.setImageBitmap(Code.getInstance().createBitmap());
- realCode = Code.getInstance().getCode().toLowerCase();
- iv_showCode.setOnClickListener(this);
- }
- @Override
- public void onClick(View v) {
- switch (v.getId()) {
- case R.id.iv_showCode:
- iv_showCode.setImageBitmap(Code.getInstance().createBitmap());
- realCode = Code.getInstance().getCode().toLowerCase();
- Log.v(TAG,"realCode"+realCode);
- break;
- case R.id.but_forgetpass_toSetCodes:
- String phoneCode = et_phoneCode.getText().toString().toLowerCase();
- String msg = "生成的验证码:"+realCode+"输入的验证码:"+phoneCode;
- Toast.makeText(MainActivity.this,msg,Toast.LENGTH_LONG).show();
- if (phoneCode.equals(realCode)) {
- Toast.makeText(MainActivity.this, phoneCode + "验证码正确", Toast.LENGTH_SHORT).show();
- } else {
- Toast.makeText(MainActivity.this, phoneCode + "验证码错误", Toast.LENGTH_SHORT).show();
- }
- break;
- }
- }
- }
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