先给大家展示下效果图，如果大家感觉还不错，请参考实现代码

很简单的一个例子,点击刷新验证码,刷新当前显示的验证码,点击确定,如果输入的和显示的匹配,就会跳转到下一个界面中,这里只是实现了跳转,并没有进行其它的操作

好了 接下来就是代码了

首先看MainActivity的布局

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity" >

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentTop="true"

android:layout_marginLeft="20dp"

android:layout_marginTop="77dp"

android:text="验证码:" />

android:id="@+id/vc_code"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBaseline="@+id/textView1"

android:layout_alignBottom="@+id/textView1"

android:layout_toRightOf="@+id/textView1"

android:ems="10" >

android:id="@+id/vc_ok"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/vc_image"

android:layout_alignRight="@+id/vc_shuaixi"

android:layout_below="@+id/vc_shuaixi"

android:layout_marginTop="15dp"

android:text="确定" />

android:id="@+id/vc_shuaixi"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignRight="@+id/vc_code"

android:layout_alignTop="@+id/vc_image"

android:layout_marginRight="20dp"

android:text="刷新验证码" />

android:id="@+id/vc_image"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/textView1"

android:layout_below="@+id/vc_code"

android:layout_marginTop="25dp"

android:src="@drawable/ic_launcher" />

MainActivity代码

package com.example.yanzhengma;

import android.R.string;

import android.os.Bundle;

import android.app.Activity;

import android.content.ClipData.Item;

import android.content.Intent;

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.TextView;

import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

ImageView vc_image; // 图片

Button vc_shuaixi, vc_ok;

String getCode = null;

EditText vc_code;

@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

vc_shuaixi = (Button) findViewById(R.id.vc_shuaixi);

vc_shuaixi.setOnClickListener(this);

vc_ok = (Button) findViewById(R.id.vc_ok);

vc_ok.setOnClickListener(this);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

@Override

public void onClick(View view) {

// TODO Auto-generated method stub

switch (view.getId()) {

case R.id.vc_shuaixi:

vc_image.setImageBitmap(Code.getInstance().getBitmap());

getCode = Code.getInstance().getCode();

break;

case R.id.vc_ok:

String v_code = vc_code.getText().toString().trim();

if (v_code == null || v_code.equals("")) {

Toast.makeText(MainActivity.this, "验证码为空", Toast.LENGTH_SHORT).show();

} else if (!v_code.equals(getCode)) {

Toast.makeText(MainActivity.this, "验证码错误", Toast.LENGTH_SHORT).show();

} else {

Toast.makeText(MainActivity.this, "验证成功", Toast.LENGTH_SHORT).show();

Intent itIntent = new Intent(MainActivity.this,

secondActivity.class);

startActivity(itIntent);

MainActivity.this.finish();

}

break;

}

}

}

好了,到重点部分了,绘制验证码

package com.example.yanzhengma;

import java.util.Random;

import android.graphics.Bitmap;

import android.graphics.Bitmap.Config;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

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;

}

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

private int width = DEFAULT_WIDTH;

private int height = DEFAULT_HEIGHT;

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;

private int codeLength = DEFAULT_CODE_LENGTH;

private int line_number = DEFAULT_LINE_NUMBER;

private int font_size = DEFAULT_FONT_SIZE;

private String code;// 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);

c.restore();//

return bp;

}

public String getCode() {

return code;

}

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

}

private void randomPadding() {

padding_left += base_padding_left + random.nextInt(range_padding_left);

padding_top = base_padding_top + random.nextInt(range_padding_top);

}

}

好了 代码都有注释,应该会看的明白的

以上所述是小编给大家介绍的Android 验证码功能实现代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！