一个完整android音乐播放器源码.doc

本文出自：/forum.php?mod=viewthread&tid=350&page=1&extra=#pid422欢迎转载，转载请注明出自： 安卓开发网下面将和大家一起介绍一个音乐播放器项目，完成后的播放器具有暂停，下一首，前一首，歌曲列表，播放条进度等一些基本功能，它只是播放SDCARD上的.map文件，Android SDK为我们提供了一个MeidaPlayer类，有了这个类我们可以很方便的创建一个mdeiaplayer服务，该类中具有一些方法：MediaPlayer mp = new MediaPlayer(); / 设置文件存储路径setDataSource(/sdcard/path_to_song); / 播放mp.start(); / 暂短mp.pause(); / 复位mp.reset(); / 获取当前播放时长mp.getDuration(); / 进度条mp.getCurrentDuration(); / Move song to particular second - used for Forward or Backwardmp.seekTo(positon); / position in milliseconds / 检测歌曲是否正在播放mp.isPlaying(); / returns true or false1：音乐播放器的界面：播放器界面中所用的一些布局图片，这些图片大家可以到android SDK文件夹下或是到网络中去寻找一些类似就可以，并不一定要这些图片，代码才是我们的关键，3：然后我们需要写一个XML布局文件用于播放器的播按钮在不同状态下的图片，此XML文件保存在drawable文件夹下，btn_play.xml 提示：大家可以根据此XML文件完成其它的一些按钮布局文件，d 在这里就没有再为大家一一提供了，4：为了让播放器更绚，我们可以自定义一个SeekBar作为歌曲的播放进度，自定义风格代如下：(4.1)更换背景图片：seekbar_progress_bg.xml (4.2)Changing SeekBar Progress:seekbar_progress.xml (4.3)实际的Seekbar控件定义如下 ：5：接下来我们将实现播放的整体界面的布局文件：player.xml 6：有了播放器的播放界面后，我们再将所有歌曲显示的界面实现了，播放器的歌曲列表用的一个listview控件，同样我们也为该listview控件自定义，适合播放的整体界面风格，list_selector.xml歌曲列表界面布局文件：playlist.xml listviewr的item界面布局，用于定义单个歌曲的显示界面：playlist_item.xml歌曲列表界面图：7：到此为止我们在上面已经完成了该项目的所有布局文件，下面我们就来实现SongManager.java类，这个类用于扫描设备中所有.mp3文件，SongsManager.mp3public class SongsManager / SDCard Path final String MEDIA_PATH = new String(/sdcard/); private ArrayListHashMap songsList = new ArrayListHashMap(); / Constructor public SongsManager() /* * Function to read all mp3 files from sdcard * and store the details in ArrayList * */ public ArrayListHashMap getPlayList() File home = new File(MEDIA_PATH); if (home.listFiles(new FileExtensionFilter().length 0) for (File file : home.listFiles(new FileExtensionFilter() HashMap song = new HashMap(); song.put(songTitle, file.getName().substring(0, (file.getName().length() - 4); song.put(songPath, file.getPath(); / Adding each song to SongList songsList.add(song); / return songs list array return songsList; /* * Class to filter files which are having .mp3 extension * */ class FileExtensionFilter implements FilenameFilter public boolean accept(File dir, String name) return (name.endsWith(.mp3) | name.endsWith(.MP3); 8：创建一个新的Activity 类，该类用于显示在ongsManager.java中扫描到的所有歌曲，PlayListActivity.javapackage com.androidhive.musicplayer; import java.util.ArrayList;import java.util.HashMap; import android.app.ListActivity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.SimpleAdapter; public class PlayListActivity extends ListActivity / Songs list public ArrayListHashMap songsList = new ArrayListHashMap(); Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.playlist); ArrayListHashMap songsListData = new ArrayListHashMap(); SongsManager plm = new SongsManager(); / get all songs from sdcard this.songsList = plm.getPlayList(); / looping through playlist for (int i = 0; i songsList.size(); i+) / creating new HashMap HashMap song = songsList.get(i); / adding HashList to ArrayList songsListData.add(song); / Adding menuItems to ListView ListAdapter adapter = new SimpleAdapter(this, songsListData, R.layout.playlist_item, new String songTitle , new int R.id.songTitle ); setListAdapter(adapter); / selecting single ListView item ListView lv = getListView(); / listening to single listitem click lv.setOnItemClickListener(new OnItemClickListener() Override public void onItemClick(AdapterView parent, View view, int position, long id) / getting listitem index int songIndex = position; / Starting new intent Intent in = new Intent(getApplicationContext(), AndroidBuildingMusicPlayerActivity.class); / Sending songIndex to PlayerActivity in.putExtra(songIndex, songIndex); setResult(100, in); / Closing PlayListView finish(); ); 9：下面我们再来实现播放的主类AndroidBuildingMusicPlayerActivity.java:该类主要实现功能如下：1：在歌曲列表界面点击一首歌曲进入播放界面；2：播放，暂停，快进，复位等功能实现3：重复播放单一歌曲，随机播放等该类的完整代码如下：public class AndroidBuildingMusicPlayerActivity extends Activity implements OnCompletionListener, SeekBar.OnSeekBarChangeListener private ImageButton btnPlay;private ImageButton btnForward;private ImageButton btnBackward;private ImageButton btnNext;private ImageButton btnPrevious;private ImageButton btnPlaylist;private ImageButton btnRepeat;private ImageButton btnShuffle;private SeekBar songProgressBar;private TextView songTitleLabel;private TextView songCurrentDurationLabel;private TextView songTotalDurationLabel;/ Media Playerprivate MediaPlayer mp;/ Handler to update UI timer, progress bar etc,.private Handler mHandler = new Handler();private SongsManager songManager;private Utilities utils;private int seekForwardTime = 5000; / 5000 millisecondsprivate int seekBackwardTime = 5000; / 5000 millisecondsprivate int currentSongIndex = 0;private boolean isShuffle = false;private boolean isRepeat = false;private ArrayListHashMap songsList = new ArrayListHashMap();Overridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);setContentView(R.layout.player);/ 所有的播放按钮btnPlay = (ImageButton) findViewById(R.id.btnPlay);btnForward = (ImageButton) findViewById(R.id.btnForward);btnBackward = (ImageButton) findViewById(R.id.btnBackward);btnNext = (ImageButton) findViewById(R.id.btnNext);btnPrevious = (ImageButton) findViewById(R.id.btnPrevious);btnPlaylist = (ImageButton) findViewById(R.id.btnPlaylist);btnRepeat = (ImageButton) findViewById(R.id.btnRepeat);btnShuffle = (ImageButton) findViewById(R.id.btnShuffle);songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);songTitleLabel = (TextView) findViewById(R.id.songTitle);songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);/ Mediaplayermp = new MediaPlayer();songManager = new SongsManager();utils = new Utilities();/ Listen