Android ClassNotFoundException: Didn't find cl

问题:

10-22 15:29:40.897: E/AndroidRuntime(2561): FATAL EXCEPTION: main
10-22 15:29:40.897: E/AndroidRuntime(2561): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.gvg.simid/com.gvg.simid.Login}: java.lang.ClassNotFoundException: Didn\'t find class \"com.gvg.simid.Login\" on path: DexPathList[[zip file \"/data/app/com.gvg.simid-1.apk\"],nativeLibraryDirectories=[/data/app-lib/com.gvg.simid-1, /vendor/lib, /system/lib]]
10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.os.Handler.dispatchMessage(Handler.java:99)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.os.Looper.loop(Looper.java:137)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.main(ActivityThread.java:5103)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at java.lang.reflect.Method.invokeNative(Native Method)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at java.lang.reflect.Method.invoke(Method.java:525)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at dalvik.system.NativeStart.main(Native Method)
10-22 15:29:40.897: E/AndroidRuntime(2561): Caused by: java.lang.ClassNotFoundException: Didn\'t find class \"com.gvg.simid.Login\" on path: DexPathList[[zip file \"/data/app/com.gvg.simid-1.apk\"],nativeLibraryDirectories=[/data/app-lib/com.gvg.simid-1, /vendor/lib, /system/lib]]
10-22 15:29:40.897: E/AndroidRuntime(2561):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
10-22 15:29:40.897: E/AndroidRuntime(2561):     ... 11 more

I\'m not really sure what is causing it as it is correctly listed in the manifest:

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

    <uses-sdk
        android:minSdkVersion=\"8\"
        android:targetSdkVersion=\"18\" />

    <uses-permission android:name=\"android.permission.ACCESS_WIFI_STATE\" />
    <uses-permission android:name=\"android.permission.ACCESS_NETWORK_STATE\" />
    <uses-permission android:name=\"android.permission.BLUETOOTH\" />
    <uses-permission android:name=\"android.permission.BLUETOOTH_ADMIN\" />
    <uses-permission android:name=\"android.permission.CAMERA\"/>
    <uses-permission android:name=\"android.permission.CHANGE_WIFI_STATE\"/>
    <uses-permission android:name=\"android.permission.INTERNET\" />
    <uses-permission android:name=\"android.permission.READ_LOGS\" />
    <uses-permission android:name=\"android.permission.READ_OWNER_DATA\" />
    <uses-permission android:name=\"android.permission.READ_PHONE_STATE\" />
    <uses-permission android:name=\"android.permission.RECORD_AUDIO\"/>
    <uses-permission android:name=\"android.permission.WRITE_EXTERNAL_STORAGE\" />
    <uses-permission android:name=\"android.permission.WRITE_OWNER_DATA\" />
    <uses-permission android:name=\"android.permission.WRITE_SETTINGS\" />
    <uses-permission android:name=\"android.permission.WAKE_LOCK\" />

    <uses-feature android:name=\"android.hardware.usb.host\" />

    <application
        android:allowBackup=\"true\"
        android:icon=\"@drawable/ic_launcher\"
        android:label=\"@string/app_name\"
        android:theme=\"@style/AppTheme\" >
        <activity
            android:name=\"com.gvg.simid.Login\"
            android:label=\"@string/app_name\" 
            android:screenOrientation=\"landscape\">
            <intent-filter>
                <action android:name=\"android.intent.action.MAIN\" />

                <category android:name=\"android.intent.category.LAUNCHER\" />
            </intent-filter>
        </activity>
    </application>

</manifest>

I also added \"Android Private Libraries\" to build path, and moved it to the top of \"Order and Export\", but it still gave me the same error.

EDIT: I rebuilt the project completely, and was unable to reproduce the error. Not sure what was causing it.

回答1:

I had the same issue for my project.It happened due to the conflict in android support library version between my project and the library project that i added in my project. Put the same version android support library in your project and library projects you included and clean build... Everything will work...

回答2:

This following method worked for me. Right click on your project and select properties. The \"Properties for \" panel will open. From the menu on the left go to Java Build Path -> Order and Export . From the list below uncheck th box next to \"Android Dependencies\". Finally clean your project and run.

Hope it works

回答3:

For those of you who are having this issue on Android Studio, I had the same problem after a merge and for some reason it even persisted after clean and invalidate cash/restart operations which was driving me crazy.

Turns out, it can be fixed by running gradle build once from command line. Simply run the following n the project directory:

./gradlew assemble clean
./gradlew assemble

I hope it\'d save someone the time waste and frustration I had to go through.

回答4:

If you are using Eclipse try Project -> Clean

回答5:

I had same issue, this worked for me

1) Full path of activity in mainfest in place of relative path.

2) Delete \'build\' folder and clean project.

回答6:

This happens if we change Build Path of the APP, this can be in any case of Adding or Removing or Changing Libraries or .jar file. The Best solution is to Restart the Eclipse.

回答7:

If you get this error while using the new Instant Run feature in Android Studio 2.0 and above then this is some kind of bug on their side.
To fix this you will have to stop your app manually on Device/Emulator if it\'s not stopped then from Android Studio select Build→Rebuild Project.
Then click the Run button or SHIFT+F10

回答8:

For any one who is having multidex enable write this

inside build.gradle

apply plugin: \'com.android.application\'

android {
 defaultConfig {
      multiDexEnabled true
  }
 dexOptions {
        javaMaxHeapSize \"4g\"
    }
}

dependencies {
    compile \'com.android.support:appcompat-v7:+\'
    compile \'com.google.android.gms:play-services:+\'
    compile \'com.android.support:multidex:1.0.1\'
}

write a class EnableMultiDex like below

import android.content.Context;
import android.support.multidex.MultiDexApplication;

public class EnableMultiDex extends MultiDexApplication {
    private static EnableMultiDex enableMultiDex;
    public static Context context;

    public EnableMultiDex(){
        enableMultiDex=this;
    }

    public static EnableMultiDex getEnableMultiDexApp() {
        return enableMultiDex;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        context = getApplicationContext();

    }
}

and in AndroidManifest.xml write this className inside Application tag

 <application
    android:name=\"YourPakageName.EnableMultiDex\"
    android:hardwareAccelerated=\"true\"
    android:icon=\"@drawable/wowio_launch_logo\"
    android:label=\"@string/app_name\"
    android:largeHeap=\"true\"
    tools:node=\"replace\">

回答9:

In my case it was proguard minification process that removed some important classes from my production apk.

The solution was to edit the proguard-rules.pro file and add the following:

-keep class com.someimportant3rdpartypackage.** { *; }

回答10:

1) Create libs folder under project root
2) Copy and paste the jar file into it
3) Configure the build path (Add jar)
4) Clean and run

cheers :-)

回答11:

I faced this error once when I defined a class that extended a view but referred to this custom view in the layout file with the wrong name. Instead of <com.example.customview/>, I had included <com.customview/> in the XML layout file.

回答12:

Believe me or not... I tried out almost each answer I had found here on stackoverflow. Nothing would help, until I just restarted the machine. My Android Studio works on Ubuntu 16.04 LTS.

回答13:

I met the same problem and I noticed the sample code was put under directory \"java\" instead of directory \"src\". After moving the code to src, the problem was solved.

Also make sure the app directory is split into multiple folders. e.g. /main/com/site/appname/ not /main/com.site.appname/

Hope it works~

回答14:

I had this issue recently and I am using Android Studio 0.8.4

The problem was the fact that I decided to rename an XML menu layout file that was called main.xml.

Right click on it and chose Refactor --> Rename. Before renaming it, be sure uncheck \"Search in comments and strings\" and pressed Refactor.

Because my file was originally named \'main\', it renamed critical paths in the app.iml and build.gradle, mainly the java.srcDirs in the build.gradle, since the path is defined as \'src/main/java\'.

I hope this helps anyone that may be experiencing this issue.

回答15:

I had this problem after upgrading from version 18. After the upgrade I had the following: Project Build Target was 5.01, targetSDKVersion=21

But: Build Tools were still from Android 4.3.1 (18) What I noticed was that those apps that were deriving their activities from ActionBarActivity crashed with the above error those that did not still ran.

So the simple fix was to use the latest Android SDK Build Tools 21.1.2 instead of only those of Android SDK Build Tools 18, which seems somehow the default.

So the culprit seems the Appcompat library, which I use for Actionbar backward compability.

And a by the way: using the appcompat library I had to set/fix: $SDKInstallDIR$\\Android\\android-sdk\\extras\\android\\support\\v7\\appcompat\\project.properties target=android-21 (which was recommended in some other useful post and which has a value of 19 by default))

回答16:

I had the same issue on Windows. I had renamed the path to the project to something containing a space.

Make sure the path to your project does not contain a space.

回答17:

I faced the same problem and solved it by doing the following:

From the build menu select

1- clean Project.

2- Build APK.

回答18:

Solution mentioned here --> Multidex Issue solution worked for me. Below is what needs to be added to Application context :

@Override
protected void attachBaseContext(Context base) {
    super.attachBaseContext(base);
    MultiDex.install(this);
}

回答19:

I had this issue, raised by several causes, but i see this in your stacktrace \"**Unable to instantiate activity ComponentInfo{...}: java.lang.ClassNotFoundException: Didn\'t find class \"...\" on path: DexPathList[[**\", I found a diference in my .classpath before it stop working.

 <?xml version=\"1.0\" encoding=\"UTF-8\"?>
<classpath>
    <classpathentry kind=\"src\" path=\"src\"/>
    <classpathentry kind=\"con\" path=\"com.android.ide.eclipse.adt.ANDROID_FRAMEWORK\"/>
    <classpathentry kind=\"con\" path=\"com.android.ide.eclipse.adt.LIBRARIES\"/>
    <classpathentry kind=\"src\" path=\"gen\"/>
    <classpathentry kind=\"output\" path=\"bin/classes\"/>
</classpath>

I\'ve ADDED the line:

<classpathentry exported=\"true\" kind=\"con\" path=\"com.android.ide.eclipse.adt.DEPENDENCIES\"/>

this is the final version:

  <?xml version=\"1.0\" encoding=\"UTF-8\"?>
<classpath>
    <classpathentry kind=\"src\" path=\"src\"/>
    <classpathentry kind=\"con\" path=\"com.android.ide.eclipse.adt.ANDROID_FRAMEWORK\"/>
    <classpathentry kind=\"con\" path=\"com.android.ide.eclipse.adt.LIBRARIES\"/>
    <classpathentry exported=\"true\" kind=\"con\" path=\"com.android.ide.eclipse.adt.DEPENDENCIES\"/>
    <classpathentry kind=\"src\" path=\"gen\"/>
    <classpathentry kind=\"output\" path=\"bin/classes\"/>
</classpath>

Now it works! =)

回答20:

I had the same exact issue. As @weiweia suggested, move the code from the java directory to src worked for me. I also removed the Android Dependencies from Project --> Properties --> Java Build Path --> Order and Export, and made sure only to include Library Projects in the Android screen.

回答21:

I had this problem for quite a while, and like everybody else the answers above didn\'t apply to my project.

In my project I had linked up a project to my project and it was throwing ClassDefNotFoundError every time some code for the other project was executed.

So this was my solution. I went to project properties of my project and Java Build Path. Pressed the \"Source\"-tab and \"link source\" from src-folder of the other project to my own project and named a new folder \"core-src\".

Hopes this solution helps someone

回答22:

I had the same issue. I am using Xamarin.Android.

The problem in my case was that I changed the versionCode and versionName.

I had no problem when I had them set like this:

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<manifest xmlns:android=\"http://schemas.android.com/apk/res/android\" package=\"pac.ka.ge\" android:versionCode=\"1\" android:versionName=\"1.0\" android:installLocation=\"auto\">

The issue appeared when I changed it to this (versionCode 2 and versionName 0.0.1):

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<manifest xmlns:android=\"http://schemas.android.com/apk/res/android\" package=\" pac.ka.ge \" android:versionCode=\"2\" android:versionName=\"0.0.1\" android:installLocation=\"auto\">

I fixed the issue by changing to versionCode 2 and versionName 1.0.0.1, like so:

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<manifest xmlns:android=\"http://schemas.android.com/apk/res/android\" package=\" pac.ka.ge \" android:versionCode=\"2\" android:versionName=\"1.0.0.1\" android:installLocation=\"auto\">

I am unsure why this was a problem, maybe Android doesn\'t like a lower versionName with a higher versionCode?

I found the following on http://developer.android.com/guide/topics/manifest/manifest-element.html#vname

android:versionCode An internal version number. This number is used only to determine whether one version is more recent than another, with higher numbers indicating more recent versions. This is not the version number shown to users; that number is set by the versionName attribute. The value must be set as an integer, such as \"100\". You can define it however you want, as long as each successive version has a higher number. For example, it could be a build number. Or you could translate a version number in \"x.y\" format to an integer by encoding the \"x\" and \"y\" separately in the lower and upper 16 bits. Or you could simply increase the number by one each time a new version is released.

android:versionName The version number shown to users. This attribute can be set as a raw string or as a reference to a string resource. The string has no other purpose than to be displayed to users. The versionCode attribute holds the significant version number used internally.

回答23:

Just in case anybody faces the same problem as me and no suggest answer here helps.

For me the cause was, that the Android studio refactor is buggy. I moved an innerclass outside of a class, which was a View and therefore also had a xml, where the direct path was set. This path will not get refactored by studio! And no error will be thrown.

Hope this helps anybody. Cheers.

回答24:

In our case we wanted to compile Vagrant version and had same error. We fixed it by clean project and rebuild project in Build menu

回答25:

I just restarted the device and ran the app. It worked without any issues. Hope this helps someone :)

回答26:

I found this error in Android Studio when i tried do debug in a device with API 23, so i checked the Android Studio and i noticed that i didnt had instaled this API 23 version. After install, i solved the problem.

回答27:

I had this problem several times and often I didn\'t do something obviously wrong with dependencies.

It\'s always a good idea to check if this \'not found\' class is present in the final apk. If it is, like it happened in my cases, the problem usually is:

It\'s not that given class is not found, but it cannot be loaded because its super class is missing.

Check if class that you extend is available and then try to fix your build script or dependencies accordingly.

回答28:

I also faced the same problem, we can solve this by doing some thing like

1- Uninstall the app.

2- Rebuild the project.

3- Clean the project.

4- Invalidate and restart the project from file -> invalidate and restart.

回答29:

I ran into the same issue. I solved it by first deleting the build folder in your android project folder and the build folder in your app folder. then clean your project and build.

回答30:

java.lang.RuntimeException: Unable to instantiate application com.android.tools.fd.runtime.BootstrapApplication: java.lang.ClassNotFoundException: Didn\'t find class \"com.android.tools.fd.runtime.BootstrapApplication\" on path: /data/app.apk(in android 4.3, 4.1)

Unable to instantiate application com.android.tools.fd.runtime.BootstrapApplication: java.lang.ClassNotFoundException: com.android.tools.fd.runtime.BootstrapApplication(in below lollipop iam facing like this error)

To disable Instant Run, it will work fine follow the below steps to disable instant run in android studio 1. Go to File Settings--> Build,Execution,Deployment -->Instant Run ---> uncheck \"Enable instant run\"