android 客户端生成随机验证码的实现
时间：2014-04-29 13:34:20
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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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