Question

my android app was running fine until I added some classes and edited the manifest file.

Now, when I try to run or debug the app on my android emulator with android 2.2, the app crashes and I get a ClassNotFoundException as follows:

D/AndroidRuntime(  275): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<<
D/AndroidRuntime(  275): CheckJNI is ON
D/AndroidRuntime(  275): --- registering native functions ---
I/ActivityManager(   59): Starting activity: Intent { act=android.intent.action.MAIN     cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=de.bastian.gpstracker/.MainActivity }
I/ActivityManager(   59): Start proc de.bastian.gpstracker for activity de.bastian.gpstracker/.MainActivity: pid=281 uid=10036 gids={}
D/AndroidRuntime(  275): Shutting down VM
D/jdwp    (  275): adbd disconnected
D/AndroidRuntime(  281): Shutting down VM
W/dalvikvm(  281): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
E/AndroidRuntime(  281): FATAL EXCEPTION: main
E/AndroidRuntime(  281): java.lang.RuntimeException: Unable to instantiate application de.bastian.gpstracker: java.lang.ClassNotFoundException: de.bastian.gpstracker in loader dalvik.system.PathClassLoader[/data/app/de.bastian.gpstracker-1.apk]
E/AndroidRuntime(  281):        at android.app.ActivityThread$PackageInfo.makeApplication(ActivityThread.java:649)
E/AndroidRuntime(  281):        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4232)
E/AndroidRuntime(  281):        at android.app.ActivityThread.access$3000(ActivityThread.java:125)
E/AndroidRuntime(  281):        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2071)
E/AndroidRuntime(  281):        at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(  281):        at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(  281):        at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime(  281):        at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(  281):        at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(  281):        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(  281):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime(  281):        at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(  281): Caused by: java.lang.ClassNotFoundException: de.bastian.gpstracker in loader dalvik.system.PathClassLoader[/data/app/de.bastian.gpstracker-1.apk]
E/AndroidRuntime(  281):        at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
E/AndroidRuntime(  281):        at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
E/AndroidRuntime(  281):        at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
E/AndroidRuntime(  281):        at android.app.Instrumentation.newApplication(Instrumentation.java:942)
E/AndroidRuntime(  281):        at android.app.ActivityThread$PackageInfo.makeApplication(ActivityThread.java:644)
E/AndroidRuntime(  281):        ... 11 more
W/ActivityManager(   59):   Force finishing activity de.bastian.gpstracker/.MainActivity
D/dalvikvm(  149): GC_FOR_MALLOC freed 4092 objects / 248904 bytes in 134ms
W/ActivityManager(   59): Activity pause timeout for HistoryRecord{43fa91d0 de.bastian.gpstracker/.MainActivity}
I/ActivityManager(   59): Displayed activity com.android.launcher/com.android.launcher2.Launcher: 12561 ms (total 12561 ms)
W/ActivityManager(   59): Activity destroy timeout for HistoryRecord{43fa91d0 de.bastian.gpstracker/.MainActivity}
D/KeyguardViewMediator(   59): pokeWakelock(5000)
D/KeyguardViewMediator(   59): pokeWakelock(5000)
I/ARMAssembler(   59): generated scanline__00000177:03515104_00001001_00000000 [ 91 ipp] (114 ins) at [0x325a10:0x325bd8] in 590637 ns
I/ARMAssembler(   59): generated scanline__00000077:03515104_00000000_00000000 [ 33 ipp] (47 ins) at [0x3261f0:0x3262ac] in 261841 ns
W/WindowManager(   59): No window to dispatch pointer action 1
I/Process (  281): Sending signal. PID: 281 SIG: 9
I/ActivityManager(   59): Process de.bastian.gpstracker (pid 281) has died.

I guess it’s something wrong with my project configuration. Here is my manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.bastian.gpstracker"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="10" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme"
        android:name="de.bastian.gpstracker" >
        <activity
            android:name="de.bastian.gpstracker.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>
    </application>

</manifest>

To be honest, I do not remember the last changes I made to this file, but, to me, everything seems to be fine here.

While searching for a sultion, I also came along the link Android Activity ClassNotFoundException – tried everything, which describes the same problem, but has a solution no applicable to my case as I am only working with a single project.

In the error log above, I noticed that the file name of the apk created ends on a ‘-1’. Maybe that’s an error, maybe that’s simply how eclipse/adt handles things. Also, I noticed that, when I try to run/debug the project, multiple class files with names MainActivity.class, MainActivity$1.class, MainActivity$2.class are created, although I only have a single MainActivity.java file (and no MainActivity$2.file or anything like that).

It would be great if someone had an idea of what’s going wrong here.

Answer 1

You are setting the application node to reference a nonexistent class

de.bastian.gpstracker

Refers to the package name, no class whatsoever. Since gpstracker is the last thing in that string, the class loader assumes that gpstracker is a class, tries to load it and fails.

So write the name of the Application class (which extends Application).

Eg

<application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme"
        android:name="de.bastian.gpstracker.MyApplicationClass" >

If you don’t have a class that extends Application, then take out the android:name attribute for this node so it looks just like:

<application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/AppTheme" >