Update library when changes to the DB are made and open manga detail activity

app/src/main/java/eu/kanade/mangafeed/AppComponent.java

@@ -6,6 +6,7 @@ import javax.inject.Singleton;
 
 import dagger.Component;
 import eu.kanade.mangafeed.data.DataModule;
+import eu.kanade.mangafeed.presenter.LibraryPresenter;
 import eu.kanade.mangafeed.ui.activity.MainActivity;
 import eu.kanade.mangafeed.ui.activity.MangaDetailActivity;
 import eu.kanade.mangafeed.ui.fragment.LibraryFragment;
@@ -20,7 +21,7 @@ import eu.kanade.mangafeed.ui.fragment.LibraryFragment;
 public interface AppComponent {
 
     void inject(MainActivity mainActivity);
-    void inject(LibraryFragment libraryFragment);
+    void inject(LibraryPresenter libraryPresenter);
     void inject(MangaDetailActivity mangaDetailActivity);
 
     Application application();

app/src/main/java/eu/kanade/mangafeed/presenter/LibraryPresenter.java

@@ -0,0 +1,47 @@
+package eu.kanade.mangafeed.presenter;
+
+import android.content.Intent;
+import android.widget.GridView;
+
+import java.util.ArrayList;
+
+import javax.inject.Inject;
+
+import de.greenrobot.event.EventBus;
+import eu.kanade.mangafeed.App;
+import eu.kanade.mangafeed.data.helpers.DatabaseHelper;
+import eu.kanade.mangafeed.ui.activity.MangaDetailActivity;
+import eu.kanade.mangafeed.ui.adapter.LibraryAdapter;
+import eu.kanade.mangafeed.view.LibraryView;
+
+import static rx.android.schedulers.AndroidSchedulers.mainThread;
+
+public class LibraryPresenter {
+
+    private LibraryView mLibraryView;
+
+    @Inject
+    public DatabaseHelper db;
+
+    public LibraryPresenter(LibraryView libraryView) {
+        mLibraryView = libraryView;
+        App.getComponent(libraryView.getActivity()).inject(this);
+    }
+
+    public void onMangaClick(LibraryAdapter adapter, int position) {
+        Intent intent = new Intent(mLibraryView.getActivity(), MangaDetailActivity.class);
+        EventBus.getDefault().postSticky(adapter.getItem(position));
+        mLibraryView.getActivity().startActivity(intent);
+    }
+
+    public void initializeMangas() {
+        db.manga.get()
+                .observeOn(mainThread())
+                .subscribe(
+                        mangas -> {
+                            mLibraryView.setMangas(new ArrayList<>(mangas));
+                        }
+                );
+    }
+
+}

app/src/main/java/eu/kanade/mangafeed/ui/adapter/LibraryAdapter.java

@@ -11,6 +11,7 @@ import android.widget.TextView;
 
 import com.bumptech.glide.Glide;
 
+import java.util.ArrayList;
 import java.util.List;
 
 import butterknife.Bind;
@@ -28,9 +29,9 @@ public class LibraryAdapter extends ArrayAdapter<Manga> {
 
     Context context;
     int layoutResourceId;
-    List<Manga> data;
+    ArrayList<Manga> data;
 
-    public LibraryAdapter(Context context, int layoutResourceId, List<Manga> data) {
+    public LibraryAdapter(Context context, int layoutResourceId, ArrayList<Manga> data) {
         super(context, layoutResourceId, data);
         this.context = context;
         this.layoutResourceId = layoutResourceId;
@@ -63,6 +64,12 @@ public class LibraryAdapter extends ArrayAdapter<Manga> {
         return row;
     }
 
+    public void setData(ArrayList<Manga> mangas) {
+        // Avoid calling dataSetChanged twice
+        data.clear();
+        addAll(mangas);
+    }
+
     private String getImageUrl() {
         return "http://img1.wikia.nocookie.net/__cb20090524204255/starwars/images/thumb/1/1a/R2d2.jpg/400px-R2d2.jpg";
     }
@@ -78,4 +85,6 @@ public class LibraryAdapter extends ArrayAdapter<Manga> {
             ButterKnife.bind(this, view);
         }
     }
+
+
 }

app/src/main/java/eu/kanade/mangafeed/ui/fragment/LibraryFragment.java

@@ -1,37 +1,29 @@
 package eu.kanade.mangafeed.ui.fragment;
 
 import android.app.Fragment;
-import android.content.Intent;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.GridView;
 
-import java.util.List;
-
-import javax.inject.Inject;
+import java.util.ArrayList;
 
 import butterknife.Bind;
 import butterknife.ButterKnife;
-import de.greenrobot.event.EventBus;
-import eu.kanade.mangafeed.App;
 import eu.kanade.mangafeed.R;
-import eu.kanade.mangafeed.data.helpers.DatabaseHelper;
 import eu.kanade.mangafeed.data.models.Manga;
+import eu.kanade.mangafeed.presenter.LibraryPresenter;
 import eu.kanade.mangafeed.ui.activity.BaseActivity;
 import eu.kanade.mangafeed.ui.adapter.LibraryAdapter;
-import rx.functions.Action1;
+import eu.kanade.mangafeed.view.LibraryView;
 
-public class LibraryFragment extends Fragment {
 
-    @Bind(R.id.gridView)
-    GridView grid;
+public class LibraryFragment extends Fragment implements LibraryView {
 
-    @Inject
-    DatabaseHelper db;
-
-    List<Manga> mangas;
+    @Bind(R.id.gridView) GridView grid;
+    LibraryPresenter mLibraryPresenter;
+    LibraryAdapter mAdapter;
 
     public static LibraryFragment newInstance() {
         LibraryFragment fragment = new LibraryFragment();
@@ -40,34 +32,45 @@ public class LibraryFragment extends Fragment {
         return fragment;
     }
 
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        mLibraryPresenter = new LibraryPresenter(this);
+    }
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         // Inflate the layout for this fragment
         View view = inflater.inflate(R.layout.fragment_library, container, false);
-        App.getComponent(getActivity()).inject(this);
         ((BaseActivity) getActivity()).getSupportActionBar().setTitle(R.string.library_title);
         ButterKnife.bind(this, view);
 
-        db.manga.get().subscribe(
-                result -> {
-                    mangas = result;
-
-                    LibraryAdapter adapter = new LibraryAdapter(getActivity(),
-                            R.layout.item_library, mangas);
-
-                    grid.setAdapter(adapter);
-                    grid.setOnItemClickListener(
-                            (parent, v, position, id) -> {
-                                Intent intent = new Intent(".ui.activity.MangaDetailActivity");
-                                EventBus.getDefault().postSticky(adapter.getItem(position));
-                                startActivity(intent);
-                            }
-                    );
-                }
-        );
+        mLibraryPresenter.initializeMangas();
+        setMangaClickListener();
 
         return view;
     }
 
+    public void setMangas(ArrayList<Manga> mangas) {
+        if (mAdapter == null) {
+            mAdapter = new LibraryAdapter(
+                    getActivity(),
+                    R.layout.item_library,
+                    mangas);
+            grid.setAdapter(mAdapter);
+        } else {
+            mAdapter.setData(mangas);
+        }
+
+    }
+
+    private void setMangaClickListener() {
+        grid.setOnItemClickListener(
+                (parent, view, position, id) ->
+                    mLibraryPresenter.onMangaClick(mAdapter, position)
+        );
+    }
+
 }

app/src/main/java/eu/kanade/mangafeed/view/BaseView.java

@@ -0,0 +1,7 @@
+package eu.kanade.mangafeed.view;
+
+import android.content.Context;
+
+public interface BaseView {
+    Context getActivity();
+}

app/src/main/java/eu/kanade/mangafeed/view/LibraryView.java

@@ -0,0 +1,10 @@
+package eu.kanade.mangafeed.view;
+
+import java.util.ArrayList;
+
+import eu.kanade.mangafeed.data.models.Manga;
+
+public interface LibraryView extends BaseView {
+
+    void setMangas(ArrayList<Manga> mangas);
+}