安卓开发-zxing二维码框架

1.新建一个项目

2.下载zxing的core-3.3.3.jar包，放到xxx/libs下，右键选add as library

3.在AndroidManifest.xml的application标签下加

4.在AndroidManifest.xml的manifest标签下加

5.build.grade里添加依赖：

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation files('libs/core-3.3.3.jar')
    implementation('com.journeyapps:zxing-android-embedded:3.6.0') { transitive = false }
}

6.展示页面activity_main.xml中增加按钮及图片

7.在xxx.java中调用扫描、生成二维码功能

package com.example.myapplication;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.BitmapFactory;

import android.hardware.Camera;
import android.os.Environment;
import android.support.annotation.DrawableRes;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;


import android.content.Intent;

import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;

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

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

import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;
import com.google.zxing.client.android.camera.CameraConfigurationUtils;
import com.journeyapps.barcodescanner.camera.CameraManager;

public class MainActivity extends AppCompatActivity  {

    private ImageView imageView;
    private TextView textView;
    private EditText editText;
    private Camera camera;
    private ImageButton imageButton_flashlight;
    private boolean isOpen = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = this.findViewById(R.id.imageView);
        textView=this.findViewById(R.id.editText);




    }
    public void onCreateQRcode(View v){
        Bitmap bmp= BitmapFactory.decodeResource(getResources(), R.mipmap.logo);
        Bitmap bitmap = createQRImage(textView.getText().toString(), 300, 300,bmp, null);
//        textView.setText("success"+textView);
        imageView.setImageBitmap(bitmap);
    }







    public static Bitmap createQRImage(String content, int widthPix, int heightPix, Bitmap logoBm, String filePath) {
        try {
            if (content == null || "".equals(content)) {
                return null;
            }
            // 配置参数
            Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            // 容错级别
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            // 设置空白边距的宽度
            hints.put(EncodeHintType.MARGIN, 0); //default is 4


            // 图像数据转换，使用了矩阵转换
            BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix, heightPix, hints);
            int[] pixels = new int[widthPix * heightPix];
            // 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 < heightPix; y++) {
                for (int x = 0; x < widthPix; x++) {
                    if (bitMatrix.get(x, y)) {
                        pixels[y * widthPix + x] = 0xff000000;
                    } else {
                        pixels[y * widthPix + x] = 0xffffffff;
                    }
                }
            }

            // 生成二维码图片的格式，使用ARGB_8888
            Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix);

            if (logoBm != null) {

                bitmap = addLogo(bitmap, logoBm);
            }

            if (filePath == null) {
                return bitmap;
            }

            // 必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的，内存消耗巨大！
            if (bitmap != null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(filePath)))
                return BitmapFactory.decodeFile(filePath);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }


    private static Bitmap addLogo(Bitmap src, Bitmap logo) {

        if (src == null) {
            return null;
        }

        if (logo == null) {
            return src;
        }

        // 获取图片的宽高
        int srcWidth = src.getWidth();
        int srcHeight = src.getHeight();
        int logoWidth = logo.getWidth();
        int logoHeight = logo.getHeight();

        if (srcWidth == 0 || srcHeight == 0) {
            return null;
        }

        if (logoWidth == 0 || logoHeight == 0) {
            return src;
        }

        // logo大小为二维码整体大小的1/5
        float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;
        Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
        try {
            Canvas canvas = new Canvas(bitmap);
            canvas.drawBitmap(src, 0, 0, null);
            canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);
            canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);
            canvas.save();
            //canvas.save(Canvas.ALL_SAVE_FLAG);
            canvas.restore();
        } catch (Exception e) {
            bitmap = null;
            e.getStackTrace();
        }

        return bitmap;
    }




    public void onScanQrcode(View v){
        IntentIntegrator integrator = new IntentIntegrator(this);
        integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE);
        integrator.setOrientationLocked(false);
        integrator.setPrompt("请将二维码放入扫描框中");
        integrator.setCameraId(0);
        integrator.setBeepEnabled(false);
        integrator.initiateScan();

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        if(result != null) {
            if(result.getContents() == null) {
                Toast.makeText(this, "扫码取消！", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, "扫描成功，条码值: " + result.getContents(), Toast.LENGTH_LONG).show();
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}

demo地址：

https://github.com/TianPu8153/MyApplication

目前demo完成的功能：
1.二维码生成及扫描（zxing）
2.图片加载（fresco）
3.滑动切换页面（pageviewer）
4.列表上拉刷新、下拉加载、长按删除（smartrefresh）