apply plugin: 'com.android.application'android { compileSdkVersion 24 buildToolsVersion "24.0.1" defaultConfig {  applicationId "com.example.ly.scanrfid"  minSdkVersion 19  targetSdkVersion 24  versionCode 1  versionName "1.0" } buildTypes {  release {   minifyEnabled false   proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'  } } repositories {  mavenCentral()  maven {  url "http://dl.bintray.com/journeyapps/maven"  } }}dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) testCompile 'junit:junit:4.12' compile 'com.android.support:appcompat-v7:24.2.1' // Supports Android 4.0.3 and later (API level 15) compile 'com.journeyapps:zxing-android-embedded:2.0.1@aar' // Supports Android 2.1 and later (API level 7), but not optimal for later Android versions. // If you only plan on supporting Android 4.0.3 and up, you don't need to include this. compile 'com.journeyapps:zxing-android-legacy:2.0.1@aar' // Convenience library to launch the scanning and encoding Activities. // It automatically picks the best scanning library from the above two, depending on the // Android version and what is available. compile 'com.journeyapps:zxing-android-integration:2.0.1@aar' // Version 3.0.x of zxing core contains some code that is not compatible on Android 2.2 and earlier. // This mostly affects encoding, but you should test if you plan to support these versions. // Older versions e.g. 2.2 may also work if you need support for older Android versions. compile 'com.google.zxing:core:3.0.1'}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"   package="com.example.ly.scanrfid"> <uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.VIBRATE"/> <uses-permission android:name="android.permission.INTERNET"/> <application  android:allowBackup="true"  android:icon="@mipmap/ic_launcher"  android:label="@string/app_name"  android:supportsRtl="true"  android:theme="@style/AppTheme">  <activity android:name=".MainActivity">   <intent-filter>    <action android:name="android.intent.action.MAIN"/>    <category android:name="android.intent.category.LAUNCHER"/>   </intent-filter>  </activity> </application></manifest>

package com.example.ly.scanrfid;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); } // 掃描按鈕點擊監聽事件 public void clickScan(View view) {  //掃描操作  IntentIntegrator integrator = new IntentIntegrator(MainActivity.this);  integrator.initiateScan(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {  // 跳轉掃描頁面返回掃描數據  IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);  //  判斷返回值是否為空  if (scanResult != null) {   //返回條形碼數據   String result = scanResult.getContents();   Log.d("code", result);   Toast.makeText(this, result, Toast.LENGTH_LONG).show();  } }}