android圖形驗證碼

android圖形驗證碼

標籤： android圖形驗證碼隨機驗證碼

2016-07-05 16:34 1102人閱讀 評論(0) 收藏 舉報

 分類：

android（3） 

版權聲明：本文爲博主原創文章，未經博主允許不得轉載。

廢話不多說上效果圖：

給上activity_main.xml佈局代碼：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginLeft="10dp"
        android:orientation="vertical">
        <ImageView
            android:id="@+id/image"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:src="@drawable/ic_launcher"/>
        <EditText
            android:id="@+id/et"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:hint="輸入驗證碼"/>
        <Button
            android:id="@+id/btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:text="獲得驗證碼"/>
        <Button
            android:id="@+id/btn_submit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:text="提交"/>
    </LinearLayout>

</RelativeLayout>

再上mainactivity代碼：

package com.example.codedemo;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
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 implements OnClickListener {

    private ImageView image;
    private EditText et;
    private Button btn,submit;
    private String codeStr;
    private CodeUtils codeUtils;

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

        initView();

    }

    private void initView() {
        image = (ImageView) findViewById(R.id.image);
        et = (EditText) findViewById(R.id.et);
        btn = (Button) findViewById(R.id.btn);
        submit = (Button) findViewById(R.id.btn_submit);
        btn.setOnClickListener(this);
        submit.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btn:
            codeUtils = CodeUtils.getInstance();
            Bitmap bitmap = codeUtils.createBitmap();
            image.setImageBitmap(bitmap);

            break;
        case R.id.btn_submit:
            codeStr = et.getText().toString().trim();
            Log.e("codeStr", codeStr);
            if (null == codeStr || TextUtils.isEmpty(codeStr)) {
                Toast.makeText(this, "請輸入驗證碼", 0).show();
                return;
            }
            String code = codeUtils.getCode();
            Log.e("code", code);
            if (code.equalsIgnoreCase(codeStr)) {
                Toast.makeText(this, "驗證碼正確", 0).show();
            } else {
                Toast.makeText(this, "驗證碼錯誤", 0).show();
            }
            break;
        default:
            break;
        }

    }
}

最後附上CodeUtils代碼：

package com.example.codedemo;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

import java.util.Random;

/**
 * Created by yao
 * 用於圖片驗證碼的工具類
 */
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 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;//驗證碼的長度  這裏是6位
    private static final int DEFAULT_FONT_SIZE = 60;//字體大小
    private static final int DEFAULT_LINE_NUMBER = 3;//多少條幹擾線
    private static final int BASE_PADDING_LEFT = 20; //左邊距
    private static final int RANGE_PADDING_LEFT = 30;//左邊距範圍值
    private static final int BASE_PADDING_TOP = 70;//上邊距
    private static final int RANGE_PADDING_TOP = 15;//上邊距範圍值
    private static final int DEFAULT_WIDTH = 300;//默認寬度.圖片的總寬
    private static final int DEFAULT_HEIGHT = 100;//默認高度.圖片的總高
    private static final int DEFAULT_COLOR = 0xDF;//默認背景顏色值

    private String code;

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

    //生成驗證碼圖片
    public Bitmap createBitmap() {
        mPaddingLeft = 0; //每次生成驗證碼圖片時初始化
        mPaddingTop = 0;

        Bitmap bitmap = Bitmap.createBitmap(DEFAULT_WIDTH, DEFAULT_HEIGHT, 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);
        }

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

        canvas.save(Canvas.ALL_SAVE_FLAG);//保存
        canvas.restore();
        return bitmap;
    }
    /**
     * 得到圖片中的驗證碼字符串
     * @return
     */
    public String getCode() {
        return code;
    }

    //生成驗證碼
    public String createCode() {
        mBuilder.delete(0, mBuilder.length()); //使用之前首先清空內容

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

        return mBuilder.toString();
    }

    //生成干擾線
    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);
    }

    //隨機顏色
    private int randomColor() {
        mBuilder.delete(0, mBuilder.length()); //使用之前首先清空內容

        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());
    }

    //隨機文本樣式
    private void randomTextStyle(Paint paint) {
        int color = randomColor();
        paint.setColor(color);
        paint.setFakeBoldText(mRandom.nextBoolean());  //true爲粗體，false爲非粗體
        float skewX = mRandom.nextInt(11) / 10;
        skewX = mRandom.nextBoolean() ? skewX : -skewX;
        paint.setTextSkewX(skewX); //float類型參數，負數表示右斜，整數左斜
//        paint.setUnderlineText(true); //true爲下劃線，false爲非下劃線
//        paint.setStrikeThruText(true); //true爲刪除線，false爲非刪除線
    }

    //隨機間距
    private void randomPadding() {
        mPaddingLeft += BASE_PADDING_LEFT + mRandom.nextInt(RANGE_PADDING_LEFT);
        mPaddingTop = BASE_PADDING_TOP + mRandom.nextInt(RANGE_PADDING_TOP);
    }
}

其中，在Default Settings中可以設置驗證碼圖形的大小，驗證碼的長度，內邊距，隨機距離等可以根據需要進行調整。