android 客户端生成随机验证码的实现

来源：互联网发布：centos 安装选项编辑：程序博客网时间：2024/06/13 00:15

首先当然是写XML咯，贴上代码

<LinearLayout      android:layout_width="match_parent"     android:layout_height="wrap_content"     android:orientation="horizontal"     android:id="@+id/yh"     >          <TextView        android:text="用户名:"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       />          <EditText        android:layout_width="fill_parent"       android:layout_height="wrap_content"       />        </LinearLayout>            <LinearLayout      android:layout_width="match_parent"     android:layout_height="wrap_content"     android:orientation="horizontal"     android:layout_below="@id/yh"     android:id="@+id/pwd"     >          <TextView        android:text="密码:"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       />          <EditText        android:layout_width="fill_parent"       android:layout_height="wrap_content"       />        </LinearLayout>      <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center_vertical"        android:layout_marginTop="4dp"        android:orientation="horizontal"        android:layout_below="@id/pwd"        android:id="@+id/code"         >        <LinearLayout          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:layout_marginBottom="10dp"          android:layout_marginLeft="10dp"          android:layout_marginRight="10dp"          android:layout_marginTop="5dp"          android:orientation="horizontal" >          <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="20dp"            android:layout_marginRight="5dp"            android:text="验 证 码:"            android:textColor="#000000" />          <EditText            android:id="@+id/vc_code"            android:layout_width="60dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:background="#0000"            android:maxLength="4"            android:paddingBottom="10dp"            android:paddingLeft="10dp"            android:paddingTop="10dp"            android:textColor="#000000"            android:textSize="14sp" />        </LinearLayout>        <ImageView          android:id="@+id/vc_image"          android:layout_width="wrap_content"          android:layout_height="match_parent"          android:layout_marginBottom="10dp"          android:layout_marginTop="5dp"          android:layout_weight="1" />        <Button          android:id="@+id/vc_shuaixi"          android:layout_width="40dp"          android:layout_height="wrap_content"          android:background="@android:color/transparent"          android:layout_gravity="center_vertical"          android:text="刷新验证码"          android:textStyle="italic"          android:layout_marginTop="5dp"          android:layout_marginBottom="10dp"          android:layout_marginLeft="5dp"          android:layout_marginRight="5dp"          android:textColor="#7f7f7f"          android:textSize="12sp" />      </LinearLayout>      <LinearLayout      android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_below="@id/code"     android:orientation="horizontal"     >     <Button        android:id="@+id/vc_ok"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:text="确定"       />        </LinearLayout>

下面贴一下MainActivity的代码:

里面的注释很详细，就不多说了！

import android.os.Bundle;import android.app.Activity;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity {    ImageView vc_image; //图标  Button vc_shuaixi,vc_ok; //确定和刷新验证码  String getCode=null; //获取验证码的值  EditText vc_code; //文本框的值    @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);        vc_image=(ImageView)findViewById(R.id.vc_image);    vc_image.setImageBitmap(Code.getInstance().getBitmap());    vc_code=(EditText) findViewById(R.id.vc_code);        getCode=Code.getInstance().getCode(); //获取显示的验证码    Log.e("info", getCode+"----");    vc_shuaixi=(Button)findViewById(R.id.vc_shuaixi);    vc_shuaixi.setOnClickListener(new OnClickListener() {            @Override      public void onClick(View v) {        // TODO Auto-generated method stub        vc_image.setImageBitmap(Code.getInstance().getBitmap());        getCode=Code.getInstance().getCode();      }    });        vc_ok=(Button)findViewById(R.id.vc_ok);    vc_ok.setOnClickListener(new OnClickListener() {            @Override      public void onClick(View v) {        // TODO Auto-generated method stub      Stringv_code=vc_code.getText().toString().trim();      if(v_code==null||v_code.equals("")){        Toast.makeText(MainActivity.this, "没有填写验证码", 2).show();      }else if(!v_code.equals(getCode)){        Toast.makeText(MainActivity.this, "验证码填写不正确", 2).show();      }else{        Toast.makeText(MainActivity.this, "操作成功", 2).show();      }            }    });      }

最后贴一下做验证码必须的一个类Code:

import java.util.Random;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Bitmap.Config;public class Code {  private static final char[] CHARS = {    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',     'n', 'o', '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', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'  };    private static Code bpUtil;  private Code(){};  public static Code getInstance() {    if(bpUtil == null)      bpUtil = new Code();    return bpUtil;  }  //default settings  private static final int DEFAULT_CODE_LENGTH = 4;//验证码的长度  这里是4位  private static final int DEFAULT_FONT_SIZE = 60;//字体大小  private static final int DEFAULT_LINE_NUMBER = 3;//多少条干扰线  private static final int BASE_PADDING_LEFT = 20; //左边距  private static final int RANGE_PADDING_LEFT = 35;//左边距范围值    private static final int BASE_PADDING_TOP = 42;//上边距  private static final int RANGE_PADDING_TOP = 15;//上边距范围值  private static final int DEFAULT_WIDTH = 200;//默认宽度.图片的总宽  private static final int DEFAULT_HEIGHT = 70;//默认高度.图片的总高  private  final int DEFAULT_COLOR=0xdf;//默认背景颜色值    //settings decided by the layout xml  //canvas width and height  private int width = DEFAULT_WIDTH;  private int height = DEFAULT_HEIGHT;     //random word space and pading_top  private int base_padding_left = BASE_PADDING_LEFT;  private int range_padding_left = RANGE_PADDING_LEFT;  private int base_padding_top = BASE_PADDING_TOP;  private int range_padding_top = RANGE_PADDING_TOP;    //number of chars, lines; font size  private int codeLength = DEFAULT_CODE_LENGTH;  private int line_number = DEFAULT_LINE_NUMBER;  private int font_size = DEFAULT_FONT_SIZE;    //variables  private String code;//保存生成的验证码  private int padding_left, padding_top;  private Random random = new Random();    private Bitmap createBitmap() {    padding_left = 0;        Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);     Canvas c = new Canvas(bp);    code = createCode();        c.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR));    Paint paint = new Paint();    paint.setTextSize(font_size);        for (int i = 0; i < code.length(); i++) {      randomTextStyle(paint);      randomPadding();      c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);    }    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.toLowerCase();  }    public Bitmap getBitmap(){    return createBitmap();  }  private String createCode() {    StringBuilder buffer = new StringBuilder();    for (int i = 0; i < codeLength; i++) {      buffer.append(CHARS[random.nextInt(CHARS.length)]);    }    return buffer.toString();  }    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);  }    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);  }    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  }    private void randomPadding() {    padding_left += base_padding_left + random.nextInt(range_padding_left);    padding_top = base_padding_top + random.nextInt(range_padding_top);  }}

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