Android : app loading library at runtime on Lollipop but not IceCreamSandwich

Question

I\'m currently developping an Android app using Android Studio. Currently, the app is launching perfectly on Lollipop devices, but crashes at launch due to a ClassNotF

Answer 1

On some low-end devices adding MultiDex.install(getBaseContext()); to MyApplication onCreate() did not work? causing java.lang.NoClassDefFoundError:

What did work was adding MultiDex.install(getBaseContext());to MyApplication attachBaseContext(Context base)

public class MyApplication extends Application {
...
   @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(base);
        MultiDex.install(base);
    }
...

Answer 2

1) Add multidex support to your app:

compile 'com.android.support:multidex:1.0.1'

2) Set your application as a MultiDexApplication. Select one of the options below:

This is the source code of android's MultiDexApplication class:

public class MultiDexApplication extends Application {
    public MultiDexApplication() {
    }

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

Option 1) You can extend your custom application from MultiDexApplication:

public class MyApplication extends MultiDexApplication {
    // Your application implementation here
}

Option 2) You can extend your custom application from default Application class, then you need to call MultiDex.install at attachBaseContext(Context base) method:

public class MyApplication extends Application {

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

    // Your application implementation here
}

Option 3) If you don't have any custom application and you don't want any, simply set your application name (at AndroidManifest.xml) to MultiDexApplication:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android.multidex.myapplication">
    <application
        ...
        android:name="android.support.multidex.MultiDexApplication">
        ...
    </application>
</manifest>

Note: If you are using a custom application class (see Option1 and Option2), application tag's android:name must already be set to your custom application class.

3) Add multiDexEnabled true setting to your build.gradle file:

defaultConfig {
    // Other settings here
    multiDexEnabled true
}

More information.

Answer 3

You can add this in Application tag of manifest file.

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

Answer 4

I forgot to add this line right after the super call in the onCreate() method of my custom application class :

 MultiDex.install(getBaseContext());

Thanks Kane for the solution !