Question

Whenever the activity that initiates the scan happens, the android application force closes. It worked at one point and suddenly won’t work anymore. Core.jar is in a lib folder.

Logcat:

11-08 18:13:16.490: E/AndroidRuntime(1667): FATAL EXCEPTION: main
11-08 18:13:16.490: E/AndroidRuntime(1667): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.picky.pickyeater/libcom.google.zxing.client.android.CaptureActivity}: java.lang.ClassNotFoundException: libcom.google.zxing.client.android.CaptureActivity in loader dalvik.system.PathClassLoader[/data/app/com.picky.pickyeater-1.apk]
11-08 18:13:16.490: E/AndroidRuntime(1667):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at android.os.Looper.loop(Looper.java:123)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at android.app.ActivityThread.main(ActivityThread.java:4627)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at java.lang.reflect.Method.invokeNative(Native Method)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at java.lang.reflect.Method.invoke(Method.java:521)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at dalvik.system.NativeStart.main(Native Method)
11-08 18:13:16.490: E/AndroidRuntime(1667): Caused by: java.lang.ClassNotFoundException: libcom.google.zxing.client.android.CaptureActivity in loader dalvik.system.PathClassLoader[/data/app/com.picky.pickyeater-1.apk]
11-08 18:13:16.490: E/AndroidRuntime(1667):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
11-08 18:13:16.490: E/AndroidRuntime(1667):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)

OnCreate():

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Intent intent = new Intent("com.google.zxing.client.android.SCAN");
        intent.putExtra("SCAN_MODE", "PRODUCT_MODE");
        startActivityForResult(intent, 0);
    }

AndroidManifest.xml excerpt:

<activity
            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>

.classpath:

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
        <classpathentry kind="src" path="src"/>
        <classpathentry kind="src" path="gen"/>
        <classpathentry exported="true" kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
        <classpathentry exported="true" kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
        <classpathentry kind="lib" path="lib/gson-1.7.1.jar"/>
        <classpathentry kind="lib" path="lib/jsoup-1.6.1.jar"/>
        <classpathentry kind="lib" path="lib/core.jar"/>
        <classpathentry kind="output" path="bin/classes"/>
</classpath>

Answer 1

I know that according to Sean above, this is technically incorrect, but this was solved by linking it in as a library.

In ZXing:
1. Right click on project
2. Click Properties
3. Click Android in the left hand side menu
4. Check Is Library

In my app:
1. Right click on project
2. Click Properties
3. Click Android in the left hand side menu
4. Click Add
5. Select the ZXing project