Android使用ZXing扫描二维码，并返回二维码结果

1.首先到https://github.com/zxing/zxing上下载zxing最新版本是3.3.1

2.解压zxing，我们主要使用下图所示的两个目录

3.把上图中的两个目录中的代码拷贝到你的Android项目中，下面是我的项目目录

4.把zxing中的layout目录中布局文件拷贝到你的项目对应目录中

5.下图是我的项目添加zxing后的结果

6.下图是从zxing中拷贝出来的布局文件

7.下来修改AndroidManifest.xml文件

加入一下代码开启权限

<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-permission android:name="android.permission.READ_CONTACTS" />

8.以上都OK了，但是zxing中的代码还是会提示R不存在，这个时候需要手动加入 import com.example.suyulin.scanqrcodetoweb.R即可，所有相关的文件都要修改。

9.新建一个Activity 代码如下，里面我加入了一个WebView

重写onActivityResult取得扫描结果

重写onDestroy是为了在关闭Activity是，释放WebVIew

onClick是按钮点击事件，用于打开摄像头开始扫描二维码。

public void onActivityResult(int requestCode, int resultCode, Intent intent)

protected void onDestroy() 

public void onClick(View view) 

WebActivity.java文件

package com.example.suzyulin.scanqrcodetoweb;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.TextView;

import com.google.zxing.client.android.Intents;
import com.google.zxing.client.android.history.HistoryItem;

public class WebActivity extends Activity implements View.OnClickListener{
    private static final int SCAN_CODE_REQUEST_CODE = 1;
    //内嵌网页
    WebView mWebview;
    WebSettings mWebSettings;
    TextView beginLoading,endLoading,loading,mtitle,QRCodeResult;
    Button btnWeb;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_web);

        QRCodeResult =(TextView)findViewById(R.id.text_QRCodeResult) ;//为了放置扫描后的结果

        btnWeb =(Button)findViewById(R.id.action_web) ;
        //内嵌网页
        mWebview = (WebView) findViewById(R.id.webView1);
        //beginLoading = (TextView) findViewById(R.id.text_beginLoading);
        endLoading = (TextView) findViewById(R.id.text_endLoading);
        //loading = (TextView) findViewById(R.id.text_Loading);
        mtitle = (TextView) findViewById(R.id.title);

        mWebSettings = mWebview.getSettings();

        mWebview.loadUrl("http://www.baidu.com/");
        //设置不用系统浏览器打开,直接显示在当前Webview
        mWebview.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
        });
        //设置WebChromeClient类
        mWebview.setWebChromeClient(new WebChromeClient() {
            //获取网站标题
            @Override
            public void onReceivedTitle(WebView view, String title) {
                System.out.println("标题在这里");
                // mtitle.setText(title);
            }

            //获取加载进度
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                if (newProgress < 100) {
                    String progress = newProgress + "%";
                  //  loading.setText(progress);
                } else if (newProgress == 100) {
                    String progress = newProgress + "%";
                   // loading.setText(progress);
                }
            }
        });

        //设置WebViewClient类
        mWebview.setWebViewClient(new WebViewClient() {
            //设置加载前的函数
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                System.out.println("开始加载了");
                //beginLoading.setText("开始加载了");

            }

            //设置结束加载函数
            @Override
            public void onPageFinished(WebView view, String url) {
                // endLoading.setText("结束加载了");

            }
        });
    }

 
public void onClick(View view) {
    System.out.println("onClick按钮被点击*********************！");
    Intent intent = null;
    switch (view.getId()){
        case R.id.ButtonScan:
            System.out.println("按钮被点击！onClick");
 
            intent = new Intent(this, com.google.zxing.client.android.CaptureActivity.class);
            startActivityForResult(intent, SCAN_CODE_REQUEST_CODE); 
            break;
        default:
            break;
    }
}

    public void BtnWebClick(View view) {
        System.out.print("BtnWebClick 按钮被点击*********************！");
        switch (view.getId()){
            case R.id.action_web:
                System.out.print("按钮被点击！BtnWebClick");
                break;
            default:
                break;
        }
    }
    @Override
    protected void onDestroy() {
        //inactivityTimer.shutdown();

        if (mWebview != null) {
            mWebview.loadDataWithBaseURL(null, "", "text/html", "utf-8", null);
            mWebview.clearHistory();

            ((ViewGroup) mWebview.getParent()).removeView(mWebview);
            mWebview.destroy();
            mWebview = null;
        }
        //super.onDestroy();


        super.onDestroy();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        if(requestCode == SCAN_CODE_REQUEST_CODE && resultCode == RESULT_OK) {
            System.out.println("WebActivity   onActivityResult begin");
            String result = intent.getExtras().getString("ResultQRCode");//intent.getStringExtra("ResultQRCode");
            System.out.println("WebActivity   onActivityResult end" + result);
            //处理
            if (result==null){
                System.out.println("result == null ");
            }
            else {
                System.out.println("result !== null ");
                QRCodeResult.setText(result);
            }
            if (result != null) {
               // QRCodeResult.setText(result);
            }
        }

 
    }
}

activity_web.xml文件内容

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="136dp">

        <Button
            android:id="@+id/ButtonScan"
            android:layout_width="267dp"
            android:layout_height="55dp"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:background="@color/colorFlex"
            android:onClick="onClick"
            android:text="@string/action_ScanQRCode" />

        <TextView
            android:id="@+id/text_QRCodeResult"
            android:layout_width="match_parent"
            android:layout_height="73dp"
            android:layout_alignParentBottom="true"
            android:layout_alignParentStart="true"
            android:layout_gravity="bottom|center_horizontal"
            android:background="@color/transparent"
            android:text="aaaaaannnnnn" />
    </RelativeLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <!--显示网页区域-->
        <WebView
            android:id="@+id/webView1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_alignParentStart="true"
            android:layout_alignParentTop="true"
            android:layout_gravity="bottom" />
    </RelativeLayout>

</LinearLayout>

10.现在开始修改CaptureActivity.java文件中handleDecode方法

public void handleDecode(Result rawResult, Bitmap barcode, float scaleFactor)

加入一下代码

Intent result = getIntent();
//Intent result = new Intent(CaptureActivity.this,WebActivity.class);
result.putExtra("ResultQRCode",rawResult.getText());
setResult(RESULT_OK,result);
finish();

加入CaptureActivity.java文件位置

if (fromLiveScan) {
  historyManager.addHistoryItem(rawResult, resultHandler);
  // Then not from history, so beep/vibrate and we have an image to draw on
  beepManager.playBeepSoundAndVibrate();
  drawResultPoints(barcode, scaleFactor, rawResult);

  //这个是为了把扫描结果传输到调用界面,2017-11-10
  Intent result = getIntent();
  //Intent result = new Intent(CaptureActivity.this,WebActivity.class);
  result.putExtra("ResultQRCode",rawResult.getText());
  setResult(RESULT_OK,result);
  finish();
}

以上都OK了，返回第9步在WebActivity.java中可以在onActivityResult中操作返回的扫描结果

public void onActivityResult(int requestCode, int resultCode, Intent intent)