二维码的简单创作

二维码

//***首先展示布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<ImageView
    android:id="@+id/imageView"
    android:layout_width="300dp"
    android:layout_height="300dp"
    app:srcCompat="@android:color/background_light" />

<Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textAllCaps="false"
    android:text="转换成二维码（mountain_hua的博客）" />

<EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="输入要转换的内容"
    android:inputType="textPersonName" />

<Button
    android:id="@+id/button2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="自定义转换" />

<Button
    android:id="@+id/button3"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="识别二维码" />

//***然后看一下MAinActivity.java文件
package com.bw.day06_zbar;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.EncodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.LuminanceSource;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
import com.google.zxing.qrcode.QRCodeWriter;

import java.util.Hashtable;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MainActivity extends AppCompatActivity {

private ImageView im1;  //imageview图片
private int w, h;        //图片宽度w,高度h

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

    Button bt = (Button) findViewById(R.id.button);
    bt.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            createQRcodeImage("https://www.baidu.com");//url百度的地址
        }
    });

    Button bt2 = (Button) findViewById(R.id.button2);
    bt2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            EditText editText = (EditText) findViewById(R.id.editText);
            createQRcodeImage(editText.getText().toString());//自定义转换内容
        }
    });

    Button bt3 = (Button) findViewById(R.id.button3);
    bt3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            im1 = (ImageView) findViewById(R.id.imageView);
            recogQRcode(im1);
        }
    });

}

//转换成二维码QRcode的函数。参数为一个字符串
public void createQRcodeImage(String url) {
    im1 = (ImageView) findViewById(R.id.imageView);
    w = im1.getWidth();
    h = im1.getHeight();
    try {
        //判断URL合法性
        if (url == null || "".equals(url) || url.length() < 1) {
            return;
        }
        Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        //图像数据转换，使用了矩阵转换
        BitMatrix bitMatrix = new QRCodeWriter().encode(url, BarcodeFormat.QR_CODE, w, h, hints);
        int[] pixels = new int[w * h];
        //下面这里按照二维码的算法，逐个生成二维码的图片，
        //两个for循环是图片横列扫描的结果
        for (int y = 0; y < h; y++) {
            for (int x = 0; x < w; x++) {
                if (bitMatrix.get(x, y)) {
                    pixels[y * w + x] = 0xff000000;
                } else {
                    pixels[y * w + x] = 0xffffffff;
                }
            }
        }
        //生成二维码图片的格式，使用ARGB_8888
        Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, w, 0, 0, w, h);
        //显示到我们的ImageView上面
        im1.setImageBitmap(bitmap);
    } catch (WriterException e) {
        e.printStackTrace();
    }
}

//识别二维码的函数
public void recogQRcode(ImageView imageView) {
    Bitmap QRbmp = ((BitmapDrawable) (imageView).getDrawable()).getBitmap();   //将图片bitmap化
    int width = QRbmp.getWidth();
    int height = QRbmp.getHeight();
    int[] data = new int[width * height];
    QRbmp.getPixels(data, 0, width, 0, 0, width, height);    //得到像素
    RGBLuminanceSource source = new RGBLuminanceSource(QRbmp);   //RGBLuminanceSource对象
    BinaryBitmap bitmap1 = new BinaryBitmap(new HybridBinarizer(source));
    QRCodeReader reader = new QRCodeReader();
    Result re = null;
    try {
        //得到结果
        re = reader.decode(bitmap1);
    } catch (NotFoundException e) {
        e.printStackTrace();
    } catch (ChecksumException e) {
        e.printStackTrace();
    } catch (FormatException e) {
        e.printStackTrace();
    }
    //Toast出内容
    Toast.makeText(MainActivity.this, re.getText(), Toast.LENGTH_SHORT).show();

    //利用正则表达式判断内容是否是URL，是的话则打开网页
    String regex = "(((https|http)?://)?([a-z0-9]+[.])|(www.))"
            + "\\w+[.|\\/]([a-z0-9]{0,})?[[.]([a-z0-9]{0,})]+((/[\\S&&[^,;\u4E00-\u9FA5]]+)+)?([.][a-z0-9]{0,}+|/?)";//设置正则表达式

    Pattern pat = Pattern.compile(regex.trim());//比对
    Matcher mat = pat.matcher(re.getText().trim());
    if (mat.matches()) {
        Uri uri = Uri.parse(re.getText());
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);//打开浏览器
        startActivity(intent);
    }

}

//识别图片所需要的RGBLuminanceSource类
public class RGBLuminanceSource extends LuminanceSource {

    private byte bitmapPixels[];

    protected RGBLuminanceSource(Bitmap bitmap) {
        super(bitmap.getWidth(), bitmap.getHeight());

        // 首先，要取得该图片的像素数组内容
        int[] data = new int[bitmap.getWidth() * bitmap.getHeight()];
        this.bitmapPixels = new byte[bitmap.getWidth() * bitmap.getHeight()];
        bitmap.getPixels(data, 0, getWidth(), 0, 0, getWidth(), getHeight());

        // 将int数组转换为byte数组，也就是取像素值中蓝色值部分作为辨析内容
        for (int i = 0; i < data.length; i++) {
            this.bitmapPixels[i] = (byte) data[i];
        }
    }

    @Override
    public byte[] getMatrix() {
        // 返回我们生成好的像素数据
        return bitmapPixels;
    }

    @Override
    public byte[] getRow(int y, byte[] row) {
        // 这里要得到指定行的像素数据
        System.arraycopy(bitmapPixels, y * getWidth(), row, 0, getWidth());
        return row;
    }
}

}

//***当然了只写这些是不行的，还要导入依赖以及添加权限
依赖为：implementation ‘com.google.zxing:core:3.3.0’
权限：

//***效果

//**二维码的制作就完成啦！！！