Add HTTP cache support.

Author: arturdryomov

src/main/java/org/amahi/anywhere/AmahiApplication.java

@@ -21,7 +21,7 @@ public void onCreate() {
 	}
 
 	private void setUpInjections() {
-		injector = ObjectGraph.create(new AmahiModule());
+		injector = ObjectGraph.create(new AmahiModule(this));
 	}
 
 	public void inject(Object injectionsConsumer) {

src/main/java/org/amahi/anywhere/AmahiModule.java

@@ -1,9 +1,14 @@
 package org.amahi.anywhere;
 
+import android.app.Application;
+
 import org.amahi.anywhere.activity.ServersActivity;
 import org.amahi.anywhere.server.ApiModule;
 
+import javax.inject.Singleton;
+
 import dagger.Module;
+import dagger.Provides;
 
 @Module(
 	includes = {
@@ -15,4 +20,15 @@
 )
 class AmahiModule
 {
+	private final Application application;
+
+	public AmahiModule(Application application) {
+		this.application = application;
+	}
+
+	@Provides
+	@Singleton
+	Application provideApplication() {
+		return application;
+	}
 }

src/main/java/org/amahi/anywhere/server/ApiModule.java

@@ -1,9 +1,16 @@
 package org.amahi.anywhere.server;
 
+import android.app.Application;
+
+import com.squareup.okhttp.HttpResponseCache;
 import com.squareup.okhttp.OkHttpClient;
+import com.squareup.okhttp.OkResponseCache;
 
 import org.amahi.anywhere.server.header.ApiHeaders;
 
+import java.io.File;
+import java.io.IOException;
+
 import javax.inject.Singleton;
 
 import dagger.Module;
@@ -12,20 +19,38 @@
 import retrofit.client.OkClient;
 
 @Module(
+	complete = false,
 	library = true
 )
 public class ApiModule
 {
 	@Provides
 	@Singleton
-	OkHttpClient provideHttpClient() {
-		return new OkHttpClient();
+	Client provideClient(OkHttpClient httpClient) {
+		return new OkClient(httpClient);
 	}
 
 	@Provides
 	@Singleton
-	Client provideClient(OkHttpClient httpClient) {
-		return new OkClient(httpClient);
+	OkHttpClient provideHttpClient(OkResponseCache httpCache) {
+		OkHttpClient httpClient = new OkHttpClient();
+
+		httpClient.setOkResponseCache(httpCache);
+
+		return httpClient;
+	}
+
+	@Provides
+	@Singleton
+	OkResponseCache provideHttpCache(Application application) {
+		try {
+			File cacheDirectory = new File(application.getCacheDir(), "http-cache");
+			int cacheSize = 5 * 1024 * 1024;
+
+			return new HttpResponseCache(cacheDirectory, cacheSize);
+		} catch (IOException e) {
+			return null;
+		}
 	}
 
 	@Provides