android ClassNotFoundException: Didn't find class

Question

    02-28 01:49:27.741: E/AndroidRuntime(23024): FATAL EXCEPTION: main
    02-28 01:49:27.741: E/AndroidRuntime(23024): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.appname.android/com.appname.android.ITCutiesReaderAppActivity}: java.lang.ClassNotFoundException: Didn't find class "com.appname.android.ITCutiesReaderAppActivity" on path: /data/app/com.appname.android-2.apk
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
...
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at dalvik.system.NativeStart.main(Native Method)
    02-28 01:49:27.741: E/AndroidRuntime(23024): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.appname.android.ITCutiesReaderAppActivity" on path: /data/app/com.appname.android-2.apk
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
    02-28 01:49:27.741: E/AndroidRuntime(23024):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
    02-28 01:49:27.741: E/AndroidRuntime(23024):    ... 11 more

I started to get this error after i delete the extra folder in app folder with same app files (and change app name, fixed names in all files). How can i fix this?

Here is manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.appname.android"
    android:versionCode="3"
    android:versionName="1.0" >
    <uses-sdk android:minSdkVersion="7" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name">
        <activity
            android:name=".ITCutiesReaderAppActivity"
            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:name=".ItemDescriptionActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
            </intent-filter>
            </activity>
    </application>
</manifest>

Post your manifest so we can double check, but you might just need to clean your project and run it again. — Sam, Feb 28 '13 at 00:01
@milesh Seems you have a package name mismatch, is `com.appname.android` the package of your app? — A--C, Feb 28 '13 at 00:11
@A--C Yes it is. Not appname in real, i just didn t use real name. But changed all realname with appname in error and manifest. — milesh, Feb 28 '13 at 00:16

score 19 · Accepted Answer · answered Feb 28 '13 at 00:29

You do have a package mismatch error, it needs to be:

package="com.haber29.android.reader"

Since reader is the next subpackage and this is the subpackage that contains the Activities.

And don't forget, you can specify the fully qualified name for each Activity, to prevent confusion:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.haber29.android"
    android:versionCode="3"
    android:versionName="1.0" >
    <uses-sdk android:minSdkVersion="7" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name">
        <activity
            android:name="com.haber29.android.reader.ITCutiesReaderAppActivity"
            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:name="com.haber29.android.reader.ItemDescriptionActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
            </intent-filter>
            </activity>
    </application>
</manifest>

score 1 · Answer 2 · edited Apr 23 '19 at 19:59

1

I have the same problem today，because my library include the android-support-v4.jar not matching with my demo. I deleted the library's android-support-v4.jar and copied my demo's jar putting it in my library and it started to work.

edited Apr 23 '19 at 19:59

xarlymg89

2,552
2
27
41

answered Oct 20 '15 at 06:34

Simon

11
2

score 0 · Answer 3 · answered Aug 27 '20 at 07:34

0

In my case my antivirus software (Avira for Mac) grabs dex files after every build I make and puts them into quarantine. After I stopped Avira, my project builds and runs.

answered Aug 27 '20 at 07:34

Emanuel

863
9
29

android ClassNotFoundException: Didn't find class

3 Answers3

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