android 实现随机生成图片验证码

在App开发中，根据需求不同，有时我们需要随机生成图片验证码，点击可以随机切换，其实很简单，接下来我们就来看看把。

首先我们使用如下工具类，其实内部原理很简单，运用随机数随机将0-9数字和a-z字母随机排列的方式进行组合，效果图如下：

接下来我们就直接上代码把：

package com.example.administrator.panada;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import java.util.Random;

public class CodeUtils {

//    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 final char[] CHARS = {

            '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 CodeUtils mCodeUtils;
    private int mPaddingLeft, mPaddingTop;
    private StringBuilder mBuilder = new StringBuilder();
    private Random mRandom = new Random();

    //Default Settings
//    private static final int DEFAULT_CODE_LENGTH = 6;//验证码的长度  这里是6位
    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 = 40; //左边距
    private static final int RANGE_PADDING_LEFT = 30;//左边距范围值
    private static final int BASE_PADDING_TOP = 70;//上边距
    private static final int RANGE_PADDING_TOP = 15;//上边距范围值
    private static final int DEFAULT_WIDTH = 300;//默认宽度.图片的总宽
    private static final int DEFAULT_HEIGHT = 100;//默认高度.图片的总高
    private static final int DEFAULT_COLOR = 0xDF;//默认背景颜色值

    private String code;

    public static CodeUtils getInstance() {
        if (mCodeUtils == null) {
            mCodeUtils = new CodeUtils();
        }
        return mCodeUtils;
    }

    //生成验证码图片  返回类型为bitmap 直接用imageview.setbitmap()即可
    public Bitmap createBitmap() {
        mPaddingLeft = 0; //每次生成验证码图片时初始化
        mPaddingTop = 0;

        Bitmap bitmap = Bitmap.createBitmap(DEFAULT_WIDTH, DEFAULT_HEIGHT, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);

        code = createCode();

        canvas.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR));
        Paint paint = new Paint();
        paint.setTextSize(DEFAULT_FONT_SIZE);

        for (int i = 0; i < code.length(); i++) {
            randomTextStyle(paint);
            randomPadding();
            canvas.drawText(code.charAt(i) + "", mPaddingLeft, mPaddingTop, paint);
        }

        //干扰线
        for (int i = 0; i < DEFAULT_LINE_NUMBER; i++) {
            drawLine(canvas, paint);
        }

        canvas.save(Canvas.ALL_SAVE_FLAG);//保存
        canvas.restore();
        return bitmap;
    }

    /**
     * 得到图片中的验证码字符串
     *
     * @return
     */
    public String getCode() {
        return code;
    }

    //生成验证码
    public String createCode() {
        mBuilder.delete(0, mBuilder.length()); //使用之前首先清空内容

        for (int i = 0; i < DEFAULT_CODE_LENGTH; i++) {
            mBuilder.append(CHARS[mRandom.nextInt(CHARS.length)]);
        }

        return mBuilder.toString();
    }

    //生成干扰线
    private void drawLine(Canvas canvas, Paint paint) {
        int color = randomColor();
        int startX = mRandom.nextInt(DEFAULT_WIDTH);
        int startY = mRandom.nextInt(DEFAULT_HEIGHT);
        int stopX = mRandom.nextInt(DEFAULT_WIDTH);
        int stopY = mRandom.nextInt(DEFAULT_HEIGHT);
        paint.setStrokeWidth(1);
        paint.setColor(color);
        canvas.drawLine(startX, startY, stopX, stopY, paint);
    }

    //随机颜色
    private int randomColor() {
        mBuilder.delete(0, mBuilder.length()); //使用之前首先清空内容

        String haxString;
        for (int i = 0; i < 3; i++) {
            haxString = Integer.toHexString(mRandom.nextInt(0xFF));
            if (haxString.length() == 1) {
                haxString = "0" + haxString;
            }

            mBuilder.append(haxString);
        }

        return Color.parseColor("#" + mBuilder.toString());
    }

    //随机文本样式
    private void randomTextStyle(Paint paint) {
        int color = randomColor();
        paint.setColor(color);
        paint.setFakeBoldText(mRandom.nextBoolean());  //true为粗体，false为非粗体
        float skewX = mRandom.nextInt(11) / 10;
        skewX = mRandom.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
    }

    //随机间距
    private void randomPadding() {
        mPaddingLeft += BASE_PADDING_LEFT + mRandom.nextInt(RANGE_PADDING_LEFT);
        mPaddingTop = BASE_PADDING_TOP + mRandom.nextInt(RANGE_PADDING_TOP);
    }
}

来看看布局代码，也就是一个ImageView

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.administrator.mygridview.MainActivity">

    <ImageView
        android:id="@+id/img"
        android:layout_width="200dp"
        android:layout_height="100dp" />

</LinearLayout>

来看MainActivity中的代码吧：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private ImageView img;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }


    private void initView() {
        img = (ImageView) findViewById(R.id.img);

    img.setImageBitmap(CodeUtils.getInstance().createBitmap()); //我们在控件初始化时设置随机生成图片验证码，防止运行第一次出现图片白色情况

img.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String code = CodeUtils.getInstance().getCode(); //获取图片验证码上的内容 img.setImageBitmap(CodeUtils.getInstance().createBitmap()); //随机生成图片验证码 } });代码很简单，有木有学会呢？