Java tutorial
/* * Author: Scott Ware <scoot.software@gmail.com> * Copyright (c) 2015 Scott Ware * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ package com.scooter1556.sms.android.fragment; import android.content.Context; import android.os.Bundle; import android.support.v4.app.ListFragment; 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.ListView; import com.google.gson.Gson; import com.loopj.android.http.JsonHttpResponseHandler; import com.scooter1556.sms.android.adapter.MediaElementListAdapter; import com.scooter1556.sms.lib.android.domain.MediaElement; import com.scooter1556.sms.lib.android.service.RESTService; import org.json.JSONArray; import org.json.JSONException; import java.util.ArrayList; public class MediaElementFragment extends ListFragment { private static final String TAG = "MediaElementFragment"; // Callback private MediaElementListener mediaElementListener; // Flags boolean isReady = false; boolean isRunning = false; /** * The Adapter which will be used to populate the ListView/GridView with * Views. */ private MediaElementListAdapter mediaElementListAdapter; private ArrayList<MediaElement> mediaElements; // REST Client RESTService restService = null; // Information we need to retrieve contents Long id = null; String title = null; Byte directoryType = null; Boolean folder = null; /** * Mandatory empty constructor for the fragment manager to instantiate the * fragment (e.g. upon screen orientation changes). */ public MediaElementFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Set fragment running isRunning = true; // Retain this fragment across configuration changes. setRetainInstance(true); // Get REST service instance restService = RESTService.getInstance(); // Retrieve arguments from main activity id = this.getArguments().getLong("id"); title = this.getArguments().getString("title"); directoryType = this.getArguments().getByte("directoryType"); folder = this.getArguments().getBoolean("folder"); // Action Bar setHasOptionsMenu(true); // Retrieve Media Elements from server getMediaElements(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Set list adapter mediaElementListAdapter = new MediaElementListAdapter(getActivity(), mediaElements); setListAdapter(mediaElementListAdapter); return super.onCreateView(inflater, container, savedInstanceState); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { // Enable fast scrolling getListView().setFastScrollEnabled(true); // Show list if content is ready setListShown(isReady); } @Override public void onDestroy() { // Cancel any remaining requests restService.getClient().cancelRequests(getContext(), false); // Set fragment is not running isRunning = false; super.onDestroy(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { } @Override public boolean onOptionsItemSelected(MenuItem item) { return super.onOptionsItemSelected(item); } @Override public void onAttach(Context context) { super.onAttach(context); try { mediaElementListener = (MediaElementListener) context; } catch (ClassCastException e) { throw new ClassCastException(context.toString() + " must implement MediaElementListener"); } } @Override public void onDetach() { super.onDetach(); mediaElementListener = null; } @Override public void onListItemClick(ListView l, View v, int position, long id) { // Notify the active callbacks interface that an item has been selected. if (mediaElementListener != null) { mediaElementListener.MediaElementSelected(mediaElements.get(position)); } } private void getMediaElements() { // Initialise array for media content mediaElements = new ArrayList<>(); // Retrieve contents of a Media Folder if (folder) { restService.getMediaFolderContents(getContext(), id, new JsonHttpResponseHandler() { @Override public void onSuccess(int statusCode, cz.msebera.android.httpclient.Header[] headers, JSONArray response) { // Check fragment has not been destroyed if (!isRunning) { return; } Gson parser = new Gson(); for (int i = 0; i < response.length(); i++) { try { mediaElements .add(parser.fromJson(response.getJSONObject(i).toString(), MediaElement.class)); } catch (JSONException e) { Log.e(TAG, "Error parsing json", e); } } mediaElementListAdapter.setItemList(mediaElements); mediaElementListAdapter.notifyDataSetChanged(); if (isRunning) { setListShown(true); } isReady = true; } }); } // Retrieve Media Element directory contents else { restService.getMediaElementContents(getContext(), id, new JsonHttpResponseHandler() { @Override public void onSuccess(int statusCode, cz.msebera.android.httpclient.Header[] headers, JSONArray response) { // Check fragment has not been destroyed if (!isRunning) { return; } Gson parser = new Gson(); for (int i = 0; i < response.length(); i++) { try { mediaElements .add(parser.fromJson(response.getJSONObject(i).toString(), MediaElement.class)); } catch (JSONException e) { Log.e(TAG, "Error parsing json", e); } } // For audio directories check for multiple artists and display artist if found if (directoryType.equals(MediaElement.DirectoryMediaType.AUDIO)) { String artist = null; for (MediaElement element : mediaElements) { if (element.getType().equals(MediaElement.MediaElementType.AUDIO)) { if (element.getArtist() != null) { if (artist == null) { artist = element.getArtist(); } else if (!element.getArtist().equals(artist)) { mediaElementListAdapter.showSubtitle(true); break; } } } } } mediaElementListAdapter.setItemList(mediaElements); mediaElementListAdapter.notifyDataSetChanged(); if (isRunning) { setListShown(true); } isReady = true; } }); } } /** * This interface must be implemented by activities that contain this * fragment to allow an interaction in this fragment to be communicated * to the activity and potentially other fragments contained in that * activity. */ public interface MediaElementListener { void MediaElementSelected(MediaElement element); void PlayAll(ArrayList<MediaElement> mediaElements); void AddAllAndPlayNext(ArrayList<MediaElement> mediaElements); void AddAllToQueue(ArrayList<MediaElement> mediaElements); } }