Android Open Source - napping-player Video Playlist

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License

The source code is released under:

GNU General Public License

Java Source Code

// Copyright (C) 2013 Werner Robitza
////from w w  w.j  av a2  s  . co m
// This file is part of NappingPlayer.
//
// NappingPlayer is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version. 
//
// NappingPlayer is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with NappingPlayer.  If not, see <http://www.gnu.org/licenses/>.
//
// NappingPlayer was written at the University of Vienna by Werner Robitza.

package at.ac.univie.nappingplayer;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

import android.util.Log;

/**
 * Abstract class that handles the playlist
 * @author werner
 *
 */
public abstract class VideoPlaylist {

  private static final String TAG = VideoPlaylist.class.getSimpleName();
  
  private static ArrayList<File>   sFiles;
  static ArrayList<Integer>   sPlayedIds;
  private static int     sCurrentVideo;
  private static int     sState;
  
  public static final int STATE_INITIALIZED   = 1;
  public static final int STATE_PLAYING     = 2;
  public static final int STATE_FINISHED     = 3;
  
  // TODO: order implementation for playlist 
  public static final int ORDER_SEQUENTIAL   = 1;
  public static final int ORDER_RANDOM     = 2;
  
  public static void initialize(ArrayList<File> files) {
    sFiles       = files;
    sPlayedIds     = new ArrayList<Integer>();
    sCurrentVideo   = 0;
    sState       = STATE_INITIALIZED;

    // TODO: Sort by name, but add other options later
    Collections.sort(sFiles);
  }
  
  /**
   * Returns a file reference for the given ID, in the order the files are read (whatever that is)
   */
  public static File getVideo(int id) {
    return sFiles.get(id);
  }
  
  /**
   * Returns the video ID for a given file
   */
  public static int getId(File f) {
    return sFiles.indexOf(f);
  }
  
  /**
   * Confirms if the playlist has a next video to play
   * @return
   */
  public static boolean hasNext() {
    Log.d(TAG, "Has next? Current video id: " + sCurrentVideo + ", size: " + sFiles.size());
    if (sState == STATE_FINISHED) {
      return false;
    } else {
      return (sCurrentVideo < (sFiles.size() - 1));
    }
  }
  
  /**
   * Sets the pointer to the next video in the playlist
   * @return True or false depending on whether a next video exists and could be selected
   */
  public static boolean incrementToNext() {
    sState = STATE_PLAYING;
    sPlayedIds.add(sCurrentVideo);
    if (hasNext()) {
      sCurrentVideo++;
      return true;
    } else {
      sState = STATE_FINISHED;
      return false;
    }
  }
  
  /**
   * Return a file reference to the video currently being selected
   */
  public static File getCurrentVideo() {
    if (sState != STATE_FINISHED) {
      sState = STATE_PLAYING;
      return sFiles.get(sCurrentVideo);      
    } else {
      return null;
    }
  }
  
  /**
   * Return the ID of the video currently being selected.
   * This ID is used in the napping context and to load the files from the ViewActivity.
   */
  public static int getCurrentVideoId() {
    if (sState != STATE_FINISHED) {
      sState = STATE_PLAYING;
      return sCurrentVideo;      
    } else {
      return -1;
    }
  }
  
  /**
   * Resets the playlist to its initial state, keeping all the videos
   */
  public static void reset() {
    sPlayedIds.clear();
    sCurrentVideo = 0;
    sState = STATE_INITIALIZED;
  }
  
  /**
   * Returns the internal state of the playlist
   * @return
   */
  public static int getState() {
    return sState;
  }
  
}

Java Source Code List

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