restore movielist on config change

app/src/main/java/net/headlezz/udacityproject1/MovieListFragment.java

@@ -42,6 +42,8 @@ public class MovieListFragment extends Fragment implements Callback<MovieList> {
      */
     private int mSortingOrder = TMDBApi.SORT_ORDER_MOST_POPULAR;
 
+    private MovieList mMovieList;
+
     RecyclerView mMovieGridView;
     ProgressBar mProgressBar;
 
@@ -70,8 +72,11 @@ public class MovieListFragment extends Fragment implements Callback<MovieList> {
         super.onActivityCreated(savedInstanceState);
         mMovieGridView.setLayoutManager(new GridLayoutManager(getActivity(), getNumColumns()));
 
-        if(savedInstanceState != null)
+        if(savedInstanceState != null) {
             mSortingOrder = savedInstanceState.getInt("sort_order");
+            if(savedInstanceState.containsKey("movielist"))
+                mMovieList = savedInstanceState.getParcelable("movielist");
+        }
     }
 
     /**
@@ -90,7 +95,18 @@ public class MovieListFragment extends Fragment implements Callback<MovieList> {
     @Override
     public void onStart() {
         super.onStart();
-        loadMovieList();
+        initMovieList();
+    }
+
+    /**
+     * sets the adapter from the restored movie list if the instance state is restored
+     * starts the download of the new movie list if no restored one is present
+     */
+    private void initMovieList() {
+        if(mMovieList == null)
+            loadMovieList();
+        else
+            mMovieGridView.setAdapter(new MovieListAdapter( (MovieNavigation) getActivity(), mMovieList));
     }
 
     @Override
@@ -128,8 +144,10 @@ public class MovieListFragment extends Fragment implements Callback<MovieList> {
 
     @Override
     public void onResponse(Response<MovieList> response, Retrofit retrofit) {
-        if(response.isSuccess())
-            setListToGrid(response.body());
+        if(response.isSuccess()) {
+            mMovieList = response.body();
+            setListToGrid(mMovieList);
+        }
         mProgressBar.setVisibility(View.GONE);
     }
 
@@ -171,6 +189,8 @@ public class MovieListFragment extends Fragment implements Callback<MovieList> {
     @Override
     public void onSaveInstanceState(Bundle outState) {
         outState.putInt("sort_order", mSortingOrder);
+        if(mMovieList != null)
+            outState.putParcelable("movielist", mMovieList);
         super.onSaveInstanceState(outState);
     }
 }

app/src/main/java/net/headlezz/udacityproject1/tmdbapi/MovieList.java

@@ -1,11 +1,16 @@
 package net.headlezz.udacityproject1.tmdbapi;
 
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import java.util.Arrays;
+import java.util.Date;
 import java.util.List;
 
 /**
  * Wrapper class for list of movies
  */
-public class MovieList {
+public class MovieList implements Parcelable {
 
     public MovieList(List<Movie> movieList) {
         this.movies = movieList;
@@ -15,4 +20,29 @@ public class MovieList {
 
     public List<Movie> getList() { return movies; }
 
+    /***** Parcelable implementation ******/
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel parcel, int i) {
+        parcel.writeList(movies);
+    }
+
+    public static final Parcelable.Creator<MovieList> CREATOR = new Parcelable.Creator<MovieList>() {
+        public MovieList createFromParcel(Parcel src) {
+            return new MovieList(src);
+        }
+
+        public MovieList[] newArray(int size) {
+            return new MovieList[size];
+        }
+    };
+
+    private MovieList(Parcel src) {
+        movies = src.readArrayList(Movie.class.getClassLoader());
+    }
 }