android client随机验证码生成函数

由于该项目使用验证码。自己找了一些资料。尽量把这个验证码做出来。代码不是很，較的简单，以下给大家看看我是怎么实现该功能的：

源代码地址下载：http://download.csdn.net/detail/u014608640/7268905

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="username:"           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="password:"           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>

以下贴一下MainActivity的代码:

里面的凝视非常具体。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@Overrideprotected 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() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubvc_image.setImageBitmap(Code.getInstance().getBitmap());getCode=Code.getInstance().getCode();}});vc_ok=(Button)findViewById(R.id.vc_ok);vc_ok.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubStringv_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, "验证码填写不对", 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 settingsprivate 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 heightprivate int width = DEFAULT_WIDTH;private int height = DEFAULT_HEIGHT; //random word space and pading_topprivate 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 sizeprivate int codeLength = DEFAULT_CODE_LENGTH;private int line_number = DEFAULT_LINE_NUMBER;private int font_size = DEFAULT_FONT_SIZE;//variablesprivate 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类型參数，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);}}

代码已经贴完成。能够试着做一下。

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