android 客户端生成随机验证码的实现
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由于项目中要用到验证码,自己找了些资料,试着就把这个验证码给做了出来,代码不是很多,比较的简单,下面给大家看看我是怎么实现该功能的:
源码地址下载: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="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
- String v_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);
- }
- }
代码已经贴完毕,可以试着做一下!
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