Running Android App Produces Java.lang.noclassdeffounderror: Retrofit.restadapter$builder

I am making a photo gallery app using the Flickr API on Android (Using Eclipse and 4.4 SDK). The project is successfully compiled but the app crashes as soon as it launches on Nexu

Solution 1:

I had the same error on Android 4.4 and below. It was something linked with the multiDexEnabling.

Try adding "multiDexEnable true" inside build.gradle:

defaultConfig {
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 16
        versionName "1.5"
        multiDexEnabled true
    }

If that doesn't help just add this line

android:name="android.support.multidex.MultiDexApplication"

inside AndroidManifest.xml as below:

    <application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:name="android.support.multidex.MultiDexApplication">
...

Solution 2:

Place your jars inside the libs folder so that you wont get a runtime NoClassDefFoundError exception. I think you might have screwed up in this part.