package io.github.droidkaigi.confsched2017.di;

import com.facebook.stetho.okhttp3.StethoInterceptor;

import android.app.Application;
import android.content.Context;
import android.content.SharedPreferences;

import java.io.File;

import javax.inject.Singleton;

import dagger.Module;
import dagger.Provides;
import io.github.droidkaigi.confsched2017.BuildConfig;
import io.reactivex.disposables.CompositeDisposable;
import okhttp3.Cache;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;

/**
 * Created by KeishinYokomaku on 2017/01/20.
 */
@Module
public class AppModule {
    static final String CACHE_FILE_NAME = "okhttp.cache";

    static final long MAX_CACHE_SIZE = 4 * 1024 * 1024;

    static final String SHARED_PREF_NAME = "preferences";

    private Context context;

    public AppModule(Application app) {
        context = app;
    }

    @Provides
    public Context provideContext() {
        return context;
    }

    @Singleton
    @Provides
    public OkHttpClient provideHttpClient(Context context, Interceptor interceptor) {
        File cacheDir = new File(context.getCacheDir(), CACHE_FILE_NAME);
        Cache cache = new Cache(cacheDir, MAX_CACHE_SIZE);

        OkHttpClient.Builder c = new OkHttpClient.Builder().cache(cache).addInterceptor(interceptor);

        return c.build();
    }

    @Provides
    public SharedPreferences provideSharedPreferences(Context context) {
        return context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
    }

    @Provides
    public CompositeDisposable provideCompositeDisposable() {
        return new CompositeDisposable();
    }

}

package io.github.droidkaigi.confsched2017.di;

import android.app.Application;
import android.content.Context;
import android.content.SharedPreferences;

import java.io.File;

import javax.inject.Singleton;

import dagger.Module;
import dagger.Provides;
import io.reactivex.disposables.CompositeDisposable;
import okhttp3.Cache;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;

/**
 * Created by KeishinYokomaku on 2017/01/20.
 */
@Module
public class AppModule {
    static final String CACHE_FILE_NAME = "okhttp.cache";

    static final long MAX_CACHE_SIZE = 4 * 1024 * 1024;

    static final String SHARED_PREF_NAME = "preferences";

    private Context context;

    public AppModule(Application app) {
        context = app;
    }

    @Provides
    public Context provideContext() {
        return context;
    }

    @Singleton
    @Provides
    public OkHttpClient provideHttpClient(Context context, Interceptor interceptor) {
        File cacheDir = new File(context.getCacheDir(), CACHE_FILE_NAME);
        Cache cache = new Cache(cacheDir, MAX_CACHE_SIZE);

        OkHttpClient.Builder c = new OkHttpClient.Builder().cache(cache).addInterceptor(interceptor);

        return c.build();
    }

    @Provides
    public SharedPreferences provideSharedPreferences(Context context) {
        return context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
    }

    @Provides
    public CompositeDisposable provideCompositeDisposable() {
        return new CompositeDisposable();
    }

}

Remove unused import statements