I currently have an ActionBarActivity which always returns a NoClassDefFoundError. I've read that it might be a problem with the ADT but I cannot be sure, hence my question. I've imported the ActionBar sample from the Android samples under
android-sdk\samples\android-14\ActionBarCompat
I've labelled the ActionBarCompat project as a library under Project -> Properties but I'm still getting the error.
To reiterator:
public class SearchActivity extends ActionBarActivity { // Doesn't work, yields exception
public class SearchActivity extends Activity { // Works perfectly
Has anyone else experienced a similar error and perhaps found a solution?
Thanks in advance.
http://developer.android.com/tools/support-library/setup.html The "Adding libraries with resources" section may help since this is not in the most common v4 support library
include only android-support-v4.jar is not enough
Ended up using ActionBarSherlock instead and added a project reference under Project Properties as well as in the Build Path. Seems to have fixed all errors relating to my question.
I've got the same problem. I solved it getting the android-support-v7-appcompat.jar library.
See here http://developer.android.com/tools/support-library/setup.html#using-apis how to install it.
I recommend focus on "Adding libraries without resources" instead "Adding libraries with resources" for the sake of simplicity.
When you do it, don't forget to import the this library into your Activity Java source. You can do it declaring import android.support.v7.app.ActionBarActivity;
I solved this problem like so, when you add the library make sure it does not have the android-support-v4 along with it (in libs folder of the library un-check android dependencies and android-support-v4), that's in the case where your project already have the android-support-v4, that's why you can't find class ActionBarActivity
This Link may help you. This library is located in the /extras/android/support/v7/appcompat/ directory. Include in eclipse and add as library. This will solve your problem.
来源：https://stackoverflow.com/questions/12662673/noclassdeffounderror-android-with-actionbaractivity