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ext {

    sourceCompatibilityVersion = JavaVersion.VERSION_1_8
    targetCompatibilityVersion = JavaVersion.VERSION_1_8

    versions = [
            annotations: [
                    jsr305: '3.0.1'
            ],

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import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;

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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="ClearableEditText">
        <attr name="clearIcon" format="reference"/>
    </declare-styleable>
</resources>

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public final class YourLibraryInitProvider extends ContentProvider {

    public YourLibraryInitProvider() {
    }

    @Override
    public boolean onCreate() {
        // get the context (Application context)
        Context context = getContext();
        // initialize whatever you need

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<manifest package="some.library.packagename"
          xmlns:android="http://schemas.android.com/apk/res/android">
    <application>
        <provider
            android:authorities="${applicationId}.yourlibraryinitprovider"
            android:exported="false"
            android:enabled="true"
            android:name=".YourLibraryInitProvider" />
    </application>

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public final class YourLibraryInitProvider extends ContentProvider {

    ...

    @Override
    public void attachInfo(Context context, ProviderInfo providerInfo) {
        if (providerInfo == null) {
            throw new NullPointerException("YourLibraryInitProvider ProviderInfo cannot be null.");
        }
        // So if the authorities equal the library internal ones, the developer forgot to set his applicationId

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public class YourApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        SomeLibrary.init(this);
        SomeOtherLibrary.init(this);
    }
}

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// use SparseArray on android! I just did this to make clear what happens here
Map<Integer, String> annotationRegistration = new HashMap<>();
List<CallAdapter.Factory> factories = new ArrayList<>();
// add all your CallAdapter.Factories here
factories.add(...)
// add default CallAdapter as the last item. This is mandatory!
factories.add(Retrofit2Platform.defaultCallAdapterFactory(null));

CustomAnnotationCallAdapterFactory callAdapterFactory = 
    new CustomAnnotationCallAdapterFactory(factories, annotationRegistration);

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package retrofit2;

import java.util.concurrent.Executor;

import retrofit2.CallAdapter.Factory;

public final class Retrofit2Platform {

    private Retrofit2Platform() {
    }

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class CustomAnnotationInterceptor implements Interceptor {
    private final Map<Integer, String> registration;

    public CustomAnnotationInterceptor(Map<Integer, String> reg) {
        this.registration = reg;
    }

    private Integer identify(Request request) {
        // make sure this is the same method you use in the CallAdapter
        return (request.url() + request.method()).hashCode();