Android之QRcode的批量生成

      众所周知，二维码的作用和价值在于提高了支付、营销、信息获取、身份认证和物流追踪等方面的效率和便利性，为用户和企业带来了更多的便利和机会，是一种快速、便捷的信息传递工具。

接下来我们使用java语言编写的android程序将会实现一个批量生成二维码的功能！

首先到GitHub库中将zing包下载并添加到你的项目中：https://github.com/zxing

为确保在我项目中所实现的功能和大家目标实现的功能一致，这里我先放上它的一个效果图：

它的主界面由上至下的构成是：4个editText编辑框，再左右2个editText编辑框，1个TextView文本框，1个生成按钮，1个查看相册的按钮。

布局代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    android:background="#8BC34A">
    <LinearLayout
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_height="200dp">
        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:gravity="center"
                android:textColor="@color/black"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="第一行："/>
            <EditText
                android:id="@+id/companyName"
                android:textColor="@color/black"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
        </LinearLayout>
        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:gravity="center"
                android:textColor="@color/black"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="批号1："/>
            <EditText
                android:id="@+id/lot01"
                android:textColor="@color/black"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
        </LinearLayout>
        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:gravity="center"
                android:textColor="@color/black"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="批号2："/>
            <EditText
                android:id="@+id/lot02"
                android:textColor="@color/black"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
        </LinearLayout>
        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:gravity="center"
                android:textColor="@color/black"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="批号3："/>
            <EditText
                android:id="@+id/lot03"
                android:textColor="@color/black"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
        </LinearLayout>
    </LinearLayout>
    <LinearLayout
        android:layout_marginTop="35dp"
        android:background="#2196F3"
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="100dp">
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="180dp"
            android:layout_height="match_parent">
            <TextView
                android:gravity="center"
                android:text="开始批号"
                android:layout_width="match_parent"
                android:layout_height="20dp"/>
            <EditText
                android:inputType="number"
                android:textColor="@color/black"
                android:id="@+id/start"
                android:background="#DA00BCD4"
                android:layout_width="180dp"
                android:layout_height="75dp"/>
        </LinearLayout>

        <View
            android:layout_width="10dp"
            android:layout_height="match_parent"/>
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="180dp"
            android:layout_height="match_parent">
            <TextView
                android:gravity="center"
                android:text="结束批号"
                android:layout_width="match_parent"
                android:layout_height="20dp"/>
            <EditText
                android:inputType="number"
                android:textColor="@color/black"
                android:id="@+id/end"
                android:background="#DA00BCD4"
                android:layout_width="180dp"
                android:layout_height="75dp"/>
        </LinearLayout>
    </LinearLayout>
    <TextView
        android:textColor="@color/black"
        android:layout_marginTop="15dp"
        android:id="@+id/fullNumber"
        android:background="#4CAF50"
        android:layout_width="match_parent"
        android:layout_height="150dp"/>
    <LinearLayout
        android:layout_marginTop="15dp"
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="100dp">
        <Button
            android:background="#5200BCD4"
            android:id="@+id/qrCodes"
            android:layout_width="180dp"
            android:layout_height="70dp"
            android:text="生成QR"
            android:textColor="@color/white"
            />
    </LinearLayout>
    <Button
        android:text="查看相册"
        android:background="#5200BCD4"
        android:layout_marginTop="45dp"
        android:id="@+id/goToPhoto"
        android:layout_width="match_parent"
        android:layout_height="60dp"/>
    <TextView
        android:id="@+id/progressText"
        android:layout_marginLeft="190dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@color/black"
        android:textSize="18sp" />
    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="gone"
        android:progress="0"
        style="@android:style/Widget.ProgressBar.Horizontal"
        />
</LinearLayout>

由于要批量生成二维码，我们可以先定义一个QRCodeGenerator类，当每次点击按钮的时候，我们就调用这个方法。代码如下：

package com.application.msgdata;

import android.content.ContentValues;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.net.Uri;
import android.provider.MediaStore;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

public class QRCodeGenerator {
    private static int i;
    public void setNum(int i) {
        this.i=i;
    }
    public static void generateQRCode(Context context, String text) {
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.MARGIN, 1);
        int width = 500;
        int height = 500;
        QRCodeWriter writer = new QRCodeWriter();
        try {
            BitMatrix bitMatrix = writer.encode(text, BarcodeFormat.QR_CODE, width, height,hints);
            Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    bitmap.setPixel(x, y, bitMatrix.get(x, y) ? Color.BLACK : Color.WHITE);
                }
            }
            saveImageToGallery(context, bitmap);
        } catch (WriterException e) {
            e.printStackTrace();
        }
    }

    private static void saveImageToGallery(Context context, Bitmap bitmap) {
        // 保存图片到系统相册
            String fileName = i+1+ ".jpg";
            ContentValues values = new ContentValues();
            values.put(MediaStore.Images.Media.DISPLAY_NAME, fileName);
            values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
        Uri uri = context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
            try {
                OutputStream outputStream = context.getContentResolver().openOutputStream(uri);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
                outputStream.flush();
                outputStream.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
    }
}

最后，我们回到主界面MainActivity中，它的一个执行过程是：我们在1~4编辑框中输入名称等数据，再在蓝底编辑框中，左边输入起始批号，右边输入结尾批号，每个编辑框我都加入了一个监听，当我们输入了相关内容时，TextView框的内容也会随之而变动，只有当所有的编辑框都补全了时，生成QR按钮才有效，接下来，我们就可以点击相册，查看二维码是否创建成功啦！

MainActivity.java代码如下：

package com.application.msgdata;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private ProgressBar progressBar;
    private TextView progressText;
    private Handler handler=new Handler();
    private SharedPreferences mSharedPreferences;
    private SharedPreferences.Editor mEditor;

    private final static int PICK_IMAGE_REQUEST=1;
    private EditText compName,lot01,lot02,lot03,beginLot,endLot;
    private String compNameStr,lot01Str,lot02Str,lot03Str,beginStr,endStr;
    private TextView allNumbers;
    private Button qr;
    private Button goPhoto;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        progressText = findViewById(R.id.progressText);
        mSharedPreferences = getSharedPreferences("MyPrefs", MODE_PRIVATE);
        mEditor = mSharedPreferences.edit();
        compName=findViewById(R.id.companyName);
        compName.setSingleLine(true);
        compName.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence s, int i, int i1, int i2) {
                compNameStr=s.toString();
                setAllNumbersText();
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });
        lot01=findViewById(R.id.lot01);
        lot01.setSingleLine(true);
        lot01.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence s, int i, int i1, int i2) {
                lot01Str=s.toString();
                setAllNumbersText();
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });
        lot02=findViewById(R.id.lot02);
        lot02.setSingleLine(true);
        lot02.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence s, int i, int i1, int i2) {
                lot02Str=s.toString();
                setAllNumbersText();
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });
        lot03=findViewById(R.id.lot03);
        lot03.setSingleLine(true);
        lot03.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence s, int i, int i1, int i2) {
                lot03Str=s.toString();
                setAllNumbersText();
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });
        beginLot=findViewById(R.id.start);
        beginLot.setSingleLine(true);
        beginLot.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence s, int i, int i1, int i2) {
                beginStr=s.toString();
                setAllNumbersText();
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });
        endLot=findViewById(R.id.end);
        endLot.setSingleLine(true);
        endLot.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence s, int i, int i1, int i2) {
                endStr=s.toString();
                setAllNumbersText();
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });
        allNumbers=findViewById(R.id.fullNumber);
        progressBar=findViewById(R.id.progress_bar);
        qr=findViewById(R.id.qrCodes);
        qr.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //检查是否输入完成
                if (!(compNameStr.isEmpty()) && !(lot01Str.isEmpty()) && !(lot02Str.isEmpty()) && !(lot03Str.isEmpty()) && !(beginStr.isEmpty()) && !(endStr.isEmpty())) {
                    progressBar.setVisibility(View.VISIBLE);
                    printImages();
                }else {
                    Toast.makeText(MainActivity.this, "请将数据填写完整！", Toast.LENGTH_SHORT).show();
                }
            }
        });

        goPhoto=findViewById(R.id.goToPhoto);
        goPhoto.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent=new Intent(Intent.ACTION_PICK);
                intent.setType("image/*");
                // 启动系统相册
                startActivityForResult(intent, PICK_IMAGE_REQUEST);
            }
        });
    }
    private void printImages() {
        // 打印图片
        int begin = Integer.valueOf(beginStr).intValue();
        int end = Integer.valueOf(endStr).intValue();
        new Thread(new Runnable() {
            @Override
            public void run() {
                for (int i = begin;i<= end;i++){
                    int temp = 0;
                    String tempStr;
                    temp = temp+begin;
                    tempStr = compNameStr+"：\n"+lot01Str+"-"+ temp +"："+lot02Str+"："+lot03Str+"："+endStr;
                    QRCodeGenerator.generateQRCode(MainActivity.this,tempStr);
                    QRCodeGenerator generator=new QRCodeGenerator();
                    generator.setNum(i);
                    try {
                        Thread.sleep(500); // 模拟耗时操作
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    int progress = i;
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            progressBar.setProgress(progress);
                            progressBar.setMax((end-begin+1));
                            progressText.setText(progress + "/"+(end-begin+1));
                        }
                    });
                }
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        progressText.setVisibility(View.GONE);
                        progressBar.setVisibility(View.GONE);
                        Toast.makeText(MainActivity.this, "你共有"+(end-begin+1)+"个二维码已保存到相册", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }).start();
    }
    @Override
    protected void onPause() {
        super.onPause();
        compNameStr=compName.getText().toString();
        mEditor.putString("company",compNameStr);
        lot01Str=lot01.getText().toString();
        mEditor.putString("lot1",lot01Str);
        lot02Str=lot02.getText().toString();
        mEditor.putString("lot2",lot02Str);
        lot03Str=lot03.getText().toString();
        mEditor.putString("lot3",lot03Str);

        beginStr=beginLot.getText().toString();
        mEditor.putString("begin",beginStr);
        endStr=endLot.getText().toString();
        mEditor.putString("end",endStr);

        mEditor.apply();
    }

    @Override
    protected void onResume() {
        super.onResume();
        String company=mSharedPreferences.getString("company","");
        compName.setText(company);
        String lot1=mSharedPreferences.getString("lot1","");
        lot01.setText(lot1);
        String lot2=mSharedPreferences.getString("lot2","");
        lot02.setText(lot2);
        String lot3=mSharedPreferences.getString("lot3","");
        lot03.setText(lot3);

        String begin=mSharedPreferences.getString("begin","");
        beginLot.setText(begin);
        String end=mSharedPreferences.getString("end","");
        endLot.setText(end);

    }

    public void setAllNumbersText() {
        allNumbers.setText( compNameStr+"：\n"+lot01Str+"-"+ beginStr +"："+lot02Str+"："+lot03Str+"："+endStr);
    }
}

你在编写代码的过程中，也许会遇到阻碍，别灰心，下面评论区，我们可以一起探讨，共同进步！

项目源码我把它上传到Gitee里了，大家需要的话可以自行下载：

二维码的生成