Integrate ZXing in Android Studio

Question

I'll start explaining all the steps I have done and in the end what is the problem.

1. Download ZXing-2.2 https://code.google.com/p/zxing/downloads/list
2. Extrac all in zxing-2.2.
3. Download and install Apache Ant http://www.youtube.com/watch?v=XJmndRfb1TU
4. With the use of Windows Commandline (Run->CMD) navigate to the extracted directory
5. In the commandline window - Type 'ant -f core/build.xml' press enter and let Apache work it's magic

At this moment is like Integrating the ZXing library directly into my Android application

But Wooops, "Buildfile: core\build.xml does not exists! Build failed. ok. 6. Importing ZXing - missing core/build.xml

Now yes, i have my core.jar.

7. Open Android Studio, File -> Import Project -> Select /android/ in /zxing-2.2/ -> Create project from existing sources -> Project name: andoid -> Source files for... all checked Next -> Libraries (cant do nothing) Next -> Modules (android checked) Next -> SDK 1.7 Next -> Finish

With Project Open -> Build -> Rebuild project

100 errors 19 warnings

File -> project Structure -> Libraries -> Add -> Java -> Select core.jar that i create before and OK -> Library 'core' will be added to the selected modules. (android) OK -> And OK in the Project Structure Dialog.

Build -> Rebuild Project

15 errors 20 warnings

All errors are error: constant expression required and I see Error in Switch cases of ZXing project in android I change all switchs for if elses.

0 errors 20 warnings

Ok, now continue:

File -> New project -> zxing_demo Next -> Next -> Blank Activity Next -> Finish

In new project -> File -> Import module -> Search and select /android/ OK -> Create module from existing sources Next -> Next -> Next -> Next -> Finish

Now I can see in the explorer /android/ /zging_demoProject/ and External Libraries

Now i change my code tu scan QR

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.zxing_demo" android:versionCode="1" android:versionName="1.0" >  <uses-sdk     android:minSdkVersion="7"     android:targetSdkVersion="16" /> <uses-permission android:name="android.permission.CAMERA"/> <uses-feature android:name="android.hardware.camera" /> <uses-feature     android:name="android.hardware.camera.autofocus"     android:required="false" /> <uses-feature     android:name="android.hardware.touchscreen"     android:required="false" /> <application     android:allowBackup="true"     android:icon="@drawable/ic_launcher"     android:label="@string/app_name"     android:theme="@style/AppTheme" >     <activity         android:name="com.example.zxing_demo.MainActivity"         android:label="@string/app_name" >         <intent-filter>             <action android:name="android.intent.action.MAIN" />              <category android:name="android.intent.category.LAUNCHER" />         </intent-filter>     </activity>     <activity         android:clearTaskOnLaunch="true"         android:stateNotNeeded="true"         android:configChanges="orientation|keyboardHidden"         android:name="com.google.zxing.client.android.CaptureActivity"         android:screenOrientation="landscape"         android:theme="@android:style/Theme.NoTitleBar.Fullscreen"         android:windowSoftInputMode="stateAlwaysHidden" >         <intent-filter >             <action android:name="android.intent.action.MAIN" />             <category android:name="android.intent.category.DEFAULT" />         </intent-filter>         <intent-filter >             <action android:name="com.google.zxing.client.android.SCAN" />             <category android:name="android.intent.category.DEFAULT" />         </intent-filter>     </activity> </application> 

MainActivity.java

package com.example.zxing_demo;  import android.app.Activity; import android.content.Intent; import android.os.Bundle;  public class MainActivity extends Activity {  @Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     Intent intent = new Intent("com.google.zxing.client.android.SCAN");     intent.putExtra("SCAN_MODE", "QR_CODE_MODE");     startActivityForResult(intent, 0); }   public void onActivityResult(int requestCode, int resultCode, Intent intent) {     if (requestCode == 0) {         if (resultCode == RESULT_OK) {             String contents = intent.getStringExtra("SCAN_RESULT");             String format = intent.getStringExtra("SCAN_RESULT_FORMAT");             // Handle successful scan         } else if (resultCode == RESULT_CANCELED) {             // Handle cancel         }     } }  } 

Now test, Run -> Debug

And CRASH.

Logcat

08-31 02:58:28.085  20665-20665/com.example.zxing_demo E/AndroidRuntime: FATAL EXCEPTION: main     java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.zxing_demo/com.google.zxing.client.android.CaptureActivity}: java.lang.ClassNotFoundException: com.google.zxing.client.android.CaptureActivity     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1891)     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)     at android.app.ActivityThread.access$600(ActivityThread.java:127)     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)     at android.os.Handler.dispatchMessage(Handler.java:99)     at android.os.Looper.loop(Looper.java:137)     at android.app.ActivityThread.main(ActivityThread.java:4448)     at java.lang.reflect.Method.invokeNative(Native Method)     at java.lang.reflect.Method.invoke(Method.java:511)     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)     at dalvik.system.NativeStart.main(Native Method)     Caused by: java.lang.ClassNotFoundException: com.google.zxing.client.android.CaptureActivity     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)     at android.app.Instrumentation.newActivity(Instrumentation.java:1023)     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1882)     ... 11 more 

I can see in AndroidManifest.xml in this line

android:name="com.google.zxing.client.android.CaptureActivity" 

"CaptureActivity" in red and the error say: Cannot resolve symbol 'CaptureActivity'

File -> Project Structure -> Modules -> zxing_demo -> Dependencies -> Add -> Module dependency -> android OK -> Apply and OK

Now CaptureActivity looks good

Debug again

08-31 03:06:58.513  21740-21740/com.example.zxing_demo E/AndroidRuntime: FATAL EXCEPTION: main     java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.zxing_demo/com.google.zxing.client.android.CaptureActivity}: java.lang.ClassNotFoundException: com.google.zxing.client.android.CaptureActivity     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1891)     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)     at android.app.ActivityThread.access$600(ActivityThread.java:127)     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)     at android.os.Handler.dispatchMessage(Handler.java:99)     at android.os.Looper.loop(Looper.java:137)     at android.app.ActivityThread.main(ActivityThread.java:4448)     at java.lang.reflect.Method.invokeNative(Native Method)     at java.lang.reflect.Method.invoke(Method.java:511)     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)     at dalvik.system.NativeStart.main(Native Method)     Caused by: java.lang.ClassNotFoundException: com.google.zxing.client.android.CaptureActivity     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)     at android.app.Instrumentation.newActivity(Instrumentation.java:1023)     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1882)     ... 11 more 

I think I will use the application and intents, but now I want do this work, if someone now whats happen tell me please.

Answer 1

I was integrating ZXING into an Android application and there were no good sources for the input all over, I will give you a hint on what worked for me - because it turned out to be very easy.

There is a real handy git repository that provides the zxing android library project as an AAR archive.

• https://github.com/journeyapps/zxing-android-embedded

All you have to do is add this to your build.gradle

repositories {     jcenter() }  dependencies {     implementation 'com.journeyapps:zxing-android-embedded:3.0.2@aar'     implementation 'com.google.zxing:core:3.2.0' } 

and Gradle does all the magic to compile the code and makes it accessible in your app.

To start the Scanner afterwards, use this class/method: From the Activity:

new IntentIntegrator(this).initiateScan(); // `this` is the current Activity 

From a Fragment:

IntentIntegrator.forFragment(this).initiateScan(); // `this` is the current Fragment // If you're using the support library, use IntentIntegrator.forSupportFragment(this) instead. 

There are several customizing options:

IntentIntegrator integrator = new IntentIntegrator(this); integrator.setDesiredBarcodeFormats(IntentIntegrator.ONE_D_CODE_TYPES); integrator.setPrompt("Scan a barcode"); integrator.setCameraId(0);  // Use a specific camera of the device integrator.setBeepEnabled(false); integrator.setBarcodeImageEnabled(true); integrator.initiateScan(); 

They have a sample-project and are providing several integration examples:

• AnyOrientationCaptureActivity
• ContinuousCaptureActivity
• CustomScannerActivity
• ToolbarCaptureActivity

If you already visited the link you going to see that I just copy&pasted the code from the git README. If not, go there to get some more insight and code examples.