Introduce dagger

app/src/main/java/fr/free/nrw/commons/di/ActivityBuilder.java

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+package fr.free.nrw.commons.di;
+
+import dagger.Module;
+import dagger.android.ContributesAndroidInjector;
+import fr.free.nrw.commons.contributions.ContributionsActivity;
+
+@Module
+public abstract class ActivityBuilder {
+
+    @ContributesAndroidInjector()
+    abstract ContributionsActivity bindSplashScreenActivity();
+}

app/src/main/java/fr/free/nrw/commons/di/AppComponent.java

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+package fr.free.nrw.commons.di;
+
+import android.app.Application;
+
+import javax.inject.Singleton;
+
+import dagger.BindsInstance;
+import dagger.Component;
+import dagger.android.support.AndroidSupportInjectionModule;
+import fr.free.nrw.commons.CommonsApplication;
+
+@Singleton
+@Component(modules = {
+        AndroidSupportInjectionModule.class,
+        AppModule.class,
+        ActivityBuilder.class
+})
+public interface AppComponent {
+
+    @Component.Builder
+    interface Builder {
+        @BindsInstance
+        Builder application(Application application);
+
+        AppComponent build();
+    }
+
+    void inject(CommonsApplication application);
+}

app/src/main/java/fr/free/nrw/commons/di/AppModule.java

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+package fr.free.nrw.commons.di;
+
+import android.app.Application;
+import android.content.Context;
+
+import javax.inject.Singleton;
+
+import dagger.Module;
+import dagger.Provides;
+import fr.free.nrw.commons.BuildConfig;
+import fr.free.nrw.commons.mwapi.ApacheHttpClientMediaWikiApi;
+import fr.free.nrw.commons.mwapi.MediaWikiApi;
+
+@Module
+public class AppModule {
+
+    @Provides
+    @Singleton
+    Context provideContext(Application application) {
+        return application;
+    }
+
+    @Provides
+    @Singleton
+    public MediaWikiApi getMWApi() {
+        return new ApacheHttpClientMediaWikiApi(BuildConfig.WIKIMEDIA_API_HOST);
+    }
+}