zxing – 蓝天白云

　　Zxing是一个可以实现条形码和二维码扫描的开源代码，现在利用Android Studio可以很方便的集成该代码库。下面是详细的使用步骤：

一、通过Gradle将Zxing集成到你的项目中

　　打开项目中的主build.gradle文件，将以下代码添加到dependencies节点中，然后点击编辑器右上角的Sync Now按钮

    compile 'com.journeyapps:zxing-android-embedded:3.0.2@aar'
    compile 'com.google.zxing:core:3.2.0'

1 2	compile 'com.journeyapps:zxing-android-embedded:3.0.2@aar' compile 'com.google.zxing:core:3.2.0'

　　效果如下图所示

二、为执行代码添加按钮

　　在你的Activity设计窗体中放置两个按钮，分别对应条码和二维码的操作，设置它们的onClick事件分别为onScanBarcode和onScanQrCode，代码如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.bcoder.zxingtest.MainActivity">

    <Button
        android:text="条形码"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button"
        android:layout_alignRight="@+id/button"
        android:layout_alignEnd="@+id/button"
        android:layout_marginTop="54dp"
        android:id="@+id/button2"
        android:onClick="onScanBarcode"/>

    <Button
        android:text="二维码"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="59dp"
        android:id="@+id/button"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:onClick="onScanQrcode"/>
</RelativeLayout>

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

<RelativeLayout

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/activity_main"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="com.bcoder.zxingtest.MainActivity">

<Button

android:text="条形码"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/button"

android:layout_alignRight="@+id/button"

android:layout_alignEnd="@+id/button"

android:layout_marginTop="54dp"

android:id="@+id/button2"

android:onClick="onScanBarcode"/>

<Button

android:text="二维码"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="59dp"

android:id="@+id/button"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:onClick="onScanQrcode"/>

</RelativeLayout>

三、扫描代码的实现

　　调用Zxing很简单，创建一个IntentIntegrator对象并设置相应的属性，然后调用该实例的initiateScan方法即可打开手机摄像头开始扫描。示例代码如下

IntentIntegrator integrator = new IntentIntegrator(this);
// 设置要扫描的条码类型，ONE_D_CODE_TYPES：一维码，QR_CODE_TYPES-二维码
integrator.setDesiredBarcodeFormats(IntentIntegrator.ONE_D_CODE_TYPES); 
integrator.setPrompt("扫描条形码");
integrator.setCameraId(0);  // 使用默认的相机
integrator.setBeepEnabled(false); // 扫到码后播放提示音
integrator.setBarcodeImageEnabled(true);
integrator.initiateScan();

IntentIntegrator integrator = new IntentIntegrator(this);

// 设置要扫描的条码类型，ONE_D_CODE_TYPES：一维码，QR_CODE_TYPES-二维码

integrator.setDesiredBarcodeFormats(IntentIntegrator.ONE_D_CODE_TYPES);

integrator.setPrompt("扫描条形码");

integrator.setCameraId(0); // 使用默认的相机

integrator.setBeepEnabled(false); // 扫到码后播放提示音

integrator.setBarcodeImageEnabled(true);

integrator.initiateScan();

　　如果调用相机不成功，可以尝试在AndroidManifest.xml中添加相机的使用权限：

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

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

四、获取扫码结果

　　我们可以在onActivityResult中获得扫码的结果，通过IntentResult实例来接收扫描结果，代码如下：

    @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 {
            // This is important, otherwise the result will not be passed to the fragment
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

@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 {

// This is important, otherwise the result will not be passed to the fragment

super.onActivityResult(requestCode, resultCode, data);

}

五、该例的java全部java代码

package com.bcoder.zxingtest;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;

public class MainActivity extends AppCompatActivity {

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

    public void onScanBarcode(View v){
        IntentIntegrator integrator = new IntentIntegrator(this);
        integrator.setDesiredBarcodeFormats(IntentIntegrator.ONE_D_CODE_TYPES);
        integrator.setPrompt("扫描条形码");
        integrator.setCameraId(0);  
        integrator.setBeepEnabled(false);
        integrator.initiateScan();
    }

    public void onScanQrcode(View v){
        IntentIntegrator integrator = new IntentIntegrator(this);
        integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);
        integrator.setPrompt("扫描二维码");
        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);
        }
    }
}

package com.bcoder.zxingtest;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Toast;

import com.google.zxing.integration.android.IntentIntegrator;

import com.google.zxing.integration.android.IntentResult;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

public void onScanBarcode(View v){

IntentIntegrator integrator = new IntentIntegrator(this);

integrator.setDesiredBarcodeFormats(IntentIntegrator.ONE_D_CODE_TYPES);

integrator.setPrompt("扫描条形码");

integrator.setCameraId(0);

integrator.setBeepEnabled(false);

integrator.initiateScan();

}

public void onScanQrcode(View v){

IntentIntegrator integrator = new IntentIntegrator(this);

integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);

integrator.setPrompt("扫描二维码");

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);

}

　　执行结果的截屏如下图：

六、其他注意事项

IntentIntegrator有两个方法是forFragment和forSupportFragment应该是用于支持Fragment和支持库版本的Fragment，如果需要在Fragment中使用Zxing可以研究一下。