MoviesFragment

MoviesFragment.java

package com.projects.ahmedbadr.moviesapp.Screens;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;
import android.widget.ImageView;

import com.projects.ahmedbadr.moviesapp.Adapters.MoviesGridAdapter;
import com.projects.ahmedbadr.moviesapp.Interfaces.PostersAdapterlistener;
import com.projects.ahmedbadr.moviesapp.R;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;

/**
 * A placeholder fragment containing a simple view.
 */
public class MoviesFragment extends Fragment implements PostersAdapterlistener {

    public MoviesGridAdapter moviesAdapter;
    GridView gridView;

    public MoviesFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        
        View RootView =  inflater.inflate(R.layout.fragment_movies, container, false);
        
        gridView = (GridView) RootView.findViewById(R.id.posters_grid);
        gridView.setAdapter(moviesAdapter);
        
        SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getActivity());
        String Url = pref.getString(getString(R.string.pref_sort_key)
                , getString(R.string.pref_sort_default));
        
        Get_Movies get_movies = new Get_Movies(this);
        get_movies.execute(Url);

        return RootView;
    }

    @Override
    public void listen(MoviesGridAdapter adapter) {
        adapter = moviesAdapter;
        adapter.notifyDataSetChanged();
    }

    
    public class Get_Movies extends AsyncTask<String, Void, ArrayList<String>> {
        
        PostersAdapterlistener postersAdapterlistener;

        public Get_Movies(PostersAdapterlistener postersAdapter){
            postersAdapterlistener = postersAdapter;
        }
        
        private ArrayList<String> getPostersURLFromJson(String MoviesJson) throws JSONException {

            final String TMDB_RESULTS = "results";
            final String TMDB_PATH = "poster_path";
            final String BASIC_URL = "http://image.tmdb.org/t/p/w185";

            ArrayList<String> PostersPathsArray = new ArrayList<String>();
            String PosterPath = "";

            JSONObject Movies_json = new JSONObject(MoviesJson);
            JSONArray MoviesArray = Movies_json.getJSONArray(TMDB_RESULTS);

            for(int i = 0; i < MoviesArray.length(); i++) {
                // Get the JSON object representing the movie
                JSONObject MovieData = MoviesArray.getJSONObject(i);
                PosterPath = MovieData.getString(TMDB_PATH);
                PostersPathsArray.add(i,BASIC_URL+PosterPath);
            }
            return PostersPathsArray;
        }

        private final String LOG_TAG = MoviesFragment.class.getSimpleName();

        @Override
        protected ArrayList<String> doInBackground(String... params) {

            HttpURLConnection urlConnection = null;
            String MoviesData = null;
            BufferedReader reader = null;

            try {
                URL url = new URL(params[0]);
                urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setRequestMethod("GET");
                urlConnection.connect();

                InputStream inputStream = urlConnection.getInputStream();
                StringBuffer buffer = new StringBuffer();
                if (inputStream == null) {
                    System.out.println("Empty Json");
                    return null;
                }
                    reader = new BufferedReader(new InputStreamReader(inputStream));
                    String line;
                    while ((line = reader.readLine()) != null) {

                        buffer.append(line + "\n");

                    }
                    if (buffer.length() == 0) {
                        return null;
                    }

                MoviesData = buffer.toString();

                Log.v(LOG_TAG, "Movies string: " + MoviesData);
            } catch (IOException e) {
                Log.e(LOG_TAG, "Error ", e);
                return null;
            } finally {
                if (urlConnection != null) {
                    urlConnection.disconnect();
                }
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (final IOException e) {
                        Log.e(LOG_TAG, "Error closing stream", e);
                    }
                }
            }
            try {
                return getPostersURLFromJson(MoviesData);
            } catch (JSONException e) {
                Log.e(LOG_TAG, e.getMessage(), e);
                e.printStackTrace();
            }

            // This will only happen if there was an error getting or parsing the forecast.
            return null;
        }

        @Override
        protected void onPostExecute(ArrayList<String> strings) {
            super.onPostExecute(strings);
            for(int i=0 ; i<strings.size() ; i++){
                System.out.println(strings.get(i));
            }

            moviesAdapter = new MoviesGridAdapter(strings,getActivity());
            //moviesAdapter.notifyDataSetChanged();
            postersAdapterlistener.listen(moviesAdapter);

        }
    }
}