FATAL EXCEPTION: java.lang.NoClassDefFoundError: android.support.v7.appcompat.R$layout

Question

I just migrated from eclipse to studio. I followed one blog to export project from eclipse to studio. The app working fine in lollipop and throwing the following error in pr

Answer 1

Your logcat returns

java.lang.NoClassDefFoundError: android.support.v7.appcompat

So update your support repository (Version 23) And ** For API 23:**

compile 'com.android.support:appcompat-v7:23.0.0'

Answer 2

In the android documentation for v7 appcompat is a note:

Note: This library depends on the v4 Support Library. If you are using Ant or Eclipse, make sure you include the v4 Support Library as part of this library's classpath.

I think thats your problem since you have comment out the line in your gradle:

   // compile "com.android.support:support-v4:18.0.+"

Add the line again and try to compile the project.

Also i see no com.android.support:appcompat-v7:21.0.0 line in your gradle

Answer 3

As I can see the gradle file you have posted here is top level gradle file,which contains stuff that should not be there. Replace your top level gradle file contents like below :

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
        mavenCentral()
        maven {
            url "http://dl.bintray.com/journeyapps/maven"
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.3.0'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

Answer 4

May be a long shot, but ensure your images are under /res/drawable and not /res/drawable-v24 See this answer: Binary XML file line #0: Error inflating class ImageView

Answer 5

I faced the same issue and fixed it. It is issue with Dex limit. Because the dex limit is reached, it creates two dex files. Lollipop knows how to read, pre-Lollipop has no idea unless you specify it in the Application class.

Please make sure following is in place:

in build.gradle

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

IMPORTANT to support pre-Lollipop:

In Manifest, under the application tag,

<application
        ...
        android:name="android.support.multidex.MultiDexApplication">
        ...
</application>

Or if you have used your own Application class, make your Application override attachBaseContext starting with

 import android.support.multidex.MultiDexApplication;
 import android.support.multidex.MultiDex;

 public class MyApplication extends MultiDexApplication {
 // ......

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

Reference: https://developer.android.com/tools/building/multidex.html#mdex-gradle