Didn't find class on path: dexpathlist

Question 1

Same problem here. What worked for me was adding android-support-v4.jar as a lib and making sure it was checked on Project properties -> Build Path -> Order & export. It was mentioned here

Question 2

I had the same problem when I moved the project folder from a Linux machine to a Mac.

What I did was:

Close the project
Remove the .iml file
Import the project using the "Create new project using existing code"

I am using IntelliJ.

Cheers.

Question 3

I did the following steps to resolve the issue on Android Studio.

open file ./app/build.gradle
reduce compileSdkVersion (e.g. 22 -> 21)
click 'sync project with gradle file'
change back to the original compileSdkVersion (e.g. 22)
click 'sync project with gradle file'

recompile and it should work.

Question 4

I have spent way to many hours on this stupid issue but finally got it resolved:

When creating a new project -> package name is causing this stupid dex issue to appear, must not be able to find the main activity during run time with whatever deployment assemply setup. Android Studio doesn't like some of my commonly used package names, I'm completely baffled..I think this is a pretty big bug haha

Given the following new project parameters:

Name: NotificationApp, packageName: com.stores.business.notificationapp, saveLocation: /home/me/AndroidStudioProjects/NotificationApp

I would get the following error: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.stores.business.notificationapp/com.stores.business.notificationapp.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.stores.business.notificationapp.MainActivity" on path: DexPathList[[zip file "/data/app/com.stores.business.notificationapp-2/base.apk"],nativeLibraryDirectories=[/data/app/com.cvs.stores.myapplication-2/lib/arm64, /vendor/lib64, /system/lib64]] at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)

My Solution I resolved it by changing the package name to:com.notificationapp, then File->invalidate caches/Restart..hope this helps someone else haha

Question 5

Do you have any required projects on the build path? Can't tell from your screen shot but check your "Projects" tab. You may have inadvertently added a Project Library as a required project instead. Remove the project from the Projects tab and then project -> properties. Click Android, add the project as a library instead here...

Question 6

Make sure that any compatibility lib jars that you're using in your main project (like android-support-v4.jar) are the same versions as those used in any of the projects that your main project references.

I had this same problem and what solved it was to copy and paste the android-support-v4.jar from another library project (that my main project was referencing) and pasting it into my main project's /libs folder.

Question 7

I had the same issue. Nothing had changed except Android studio and Gradle updated since I last compiled.

I took a look at the build options under Build>Edit Build Types and noticed that the one option that was different between my project that didn't run and the ones that did work was the Minify Enable option.

I set it to false and now everything works again.

Question 8

I should understand the problem by just seeing "dex errors".But it took half day to fix the issue. I fix this by following android developers page's instruction: https://developer.android.com/studio/build/multidex.html

First add this to my gradle.build:

defaultConfig {
...
minSdkVersion 14
targetSdkVersion 21
...

// Enabling multidex support.
multiDexEnabled true
}

dependencies {
  compile 'com.android.support:multidex:1.0.0'
}

Then I extend my Application class (or declare the application class in AndroidManifest.xml or override attachBaseContext() function) as instructed by the MultiDexApplication class document on the page. This have fixed my problem.