Set up caching in OkHttpClient

app/src/main/java/in/ac/iitb/gymkhana/iitbapp/MainActivity.java

@@ -323,7 +323,7 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
     public void initPicasso() {
         Picasso.Builder builder = new Picasso.Builder(getApplicationContext());
         builder.downloader(new OkHttp3Downloader((
-                UnsafeOkHttpClient.getUnsafeOkHttpClient()
+                UnsafeOkHttpClient.getUnsafeOkHttpClient(getApplicationContext())
         )));
         Picasso built = builder.build();
         built.setIndicatorsEnabled(false);

app/src/main/java/in/ac/iitb/gymkhana/iitbapp/api/UnsafeOkHttpClient.java

 package in.ac.iitb.gymkhana.iitbapp.api;
 
+import android.content.Context;
+
 import java.security.cert.CertificateException;
 
 import javax.net.ssl.HostnameVerifier;
@@ -9,10 +11,11 @@ import javax.net.ssl.SSLSocketFactory;
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.X509TrustManager;
 
+import okhttp3.Cache;
 import okhttp3.OkHttpClient;
 
 public class UnsafeOkHttpClient {
-    public static OkHttpClient getUnsafeOkHttpClient() {
+    public static OkHttpClient getUnsafeOkHttpClient(Context context) {
         try {
             // Create a trust manager that does not validate certificate chains
             final TrustManager[] trustAllCerts = new TrustManager[] {
@@ -40,6 +43,8 @@ public class UnsafeOkHttpClient {
             final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
 
             OkHttpClient.Builder builder = new OkHttpClient.Builder();
+            Cache cache = new Cache(context.getCacheDir(), 200000000);
+            builder.cache(cache);
             builder.sslSocketFactory(sslSocketFactory, (X509TrustManager)trustAllCerts[0]);
             builder.hostnameVerifier(new HostnameVerifier() {
                 @Override

app/src/main/java/in/ac/iitb/gymkhana/iitbapp/fragment/ProfileFragment.java

@@ -12,7 +12,6 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import com.jakewharton.picasso.OkHttp3Downloader;
 import com.squareup.picasso.Picasso;
 
 import java.util.List;
@@ -23,7 +22,6 @@ import in.ac.iitb.gymkhana.iitbapp.R;
 import in.ac.iitb.gymkhana.iitbapp.adapter.RoleAdapter;
 import in.ac.iitb.gymkhana.iitbapp.api.RetrofitInterface;
 import in.ac.iitb.gymkhana.iitbapp.api.ServiceGenerator;
-import in.ac.iitb.gymkhana.iitbapp.api.UnsafeOkHttpClient;
 import in.ac.iitb.gymkhana.iitbapp.data.Body;
 import in.ac.iitb.gymkhana.iitbapp.data.Role;
 import in.ac.iitb.gymkhana.iitbapp.data.User;