简易android音乐播放器.doc

本音乐播放器实现播放列表和播放界面之间的跳转，由于本人是初学者，只能实现以下功能：自动获取播放列表、点击上一首、下一首、播放、暂停、音量调节、显示歌手、演唱者、拉动播放进度条、显示歌曲总长度、当前播放时间。代码如下：一、 xml文件（3个）1. main.xml 2. listitem.xml 3. music_player.xml 二、 activity文件（两个）1. MyListViewDemo.javapackage org.lxh.demo;import java.io.IOException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.content.ContentResolver;import android.content.Intent;import android.database.Cursor;import android.media.MediaPlayer;import android.os.Bundle;import vider.MediaStore;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;import android.widget.SimpleAdapter;public class MyListViewDemo extends Activity / private SimpleCursorAdapter adapter = null;private ListView datalist = null; / 定义ListView组件/ public void onCreate(Bundle savedInstanceState) / super.onCreate(savedInstanceState);/ super.setContentView(R.layout.main);/ this.datalist = (ListView) super.findViewById(R.id.datalist); / 取得组件/ ContentResolver resolver = getContentResolver();/ / 从Content Provider中获得SD卡上的音乐列表/ Cursor cursor =/ resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,/ null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);/ /控制Cursor/ startManagingCursor(cursor);/ String cols = new String MediaStore.Audio.Media.TITLE,/ MediaStore.Audio.Media.ARTIST,/ MediaStore.Audio.Media.DATA ;/ int ids = new intR.id.trackname, R.id.artist, R.id.path;/ adapter = new SimpleCursorAdapter(this, R.layout.listitem,/ cursor, cols, ids);/ / this.simplecursoradapter = new SimpleCursorAdapter(this, this.list,/ / R.layout.listitem, new String pic, title, author,/ / type, score / Map中的key的名称/ / , new int R.id.pic, R.id.title, R.id.author, R.id.type,/ / R.id.score ); / 是data_list.xml中定义的组件的资源ID/ /this.datalist.setAdapter(this.simplecursoradapter);/ datalist.setAdapter(adapter);private ListMap list = new ArrayListMap(); / 定义显示的内容包装private SimpleAdapter adapter = null; / 进行数据的转换操作public Cursor cursor;/ 1.使用Mediastore进行查询时，需要一个curor。private String _paths;/ 13.建这个数组保存查询到的信息private String _titles;/ 14.建这个数组保存查询到的信息private String _artists;/ 15.建这个数组保存查询到的信息private MediaPlayer mediaPlayer;public int position = 0;private static final int code = 1;/* 获取音乐文件的方法 */public void getMusicFile() / 3.获取音乐文件的方法cursor = this.getContentResolver().query(/ 4.要实现contenresolver这个查询接口的话就要用curorMediaStore.Audio.Media.EXTERNAL_CONTENT_URI,/ 5./ uri是系统提供给我们的，可以看一下帮助文档，系统给我们提供了两个uri，/ 一个是查询外部sd卡的uri，一个是查询手机本身内部文件的uri。我们现在所使用的是查询外部的uri。new String MediaStore.Audio.Media.DATA,/ 6.查询列，在这里我们这保存三项，Data是歌曲的保存路径MediaStore.Audio.Media.TITLE,/ 7.查询歌曲名称MediaStore.Audio.Media.ARTIST / 8.查询歌唱者, null, null, null);/ 9.这三项表示查询条件，设置为null表示查询所有的。startManagingCursor(cursor);if (cursor != null | cursor.getCount() = 0) / 10.判断查询长度是否为空。即：查询是否有音乐文件。/ Toast.makeText(this, 没有音乐文件, Toast.LENGTH_SHORT).show();/ Log.i(TAG, 没有音乐文件);/ 11.将信息查询到的结果打印在控制台上_paths = new Stringcursor.getCount();/ 16.对数组进行初始化，数组的长度就是curor的长度_titles = new Stringcursor.getCount();/ 16.对数组进行初始化，数组的长度就是curor的长度_artists = new Stringcursor.getCount();/ 16.对数组进行初始化，数组的长度就是curor的长度cursor.moveToFirst();/ 17.将cursor的游标移到第一位for (int i = 0; i cursor.getCount(); i+) / 18.用for循环读取curor里面的信息_pathsi = cursor.getString(0);/ 19.用getString获取信息，0表示他的索引，即：从_paths这一项开始查询_titlesi = cursor.getString(1);/ 19.用getString获取信息_artistsi = cursor.getString(2);/ 19.用getString获取信息cursor.moveToNext();/ 20.将游标移到下一位/ Log.i(TAG, path = + _pathsi);/ 21.将查询到的信息打印在控制台上/ Log.i(TAG, thitle = + _titlesi);/ 21.将查询到的信息打印在控制台上/ Log.i(TAG, artist = + _artistsi);/ 21.将查询到的信息打印在控制台上/* 获取音乐文件的方法 */Overridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);super.setContentView(R.layout.main);this.datalist = (ListView) super.findViewById(R.id.datalist); / 取得组件getMusicFile();for (int x = 0; x _titles.length; x+) Map map = new HashMap(); / 定义Map集合，保存每一行数据map.put(trackname, _titlesx); / 与data_list.xml中的TextView组加匹配map.put(artist, _artistsx); / 与data_list.xml中的TextView组加匹配map.put(path, _pathsx); / 与data_list.xml中的TextView组加匹配/ map.put(type,this.data2x0);/ map.put(score, this.data2x1);this.list.add(map); / 保存了所有的数据行this.adapter = new SimpleAdapter(this, this.list, R.layout.listitem,new String trackname, artist, path / Map中的key的名称, new int R.id.trackname, R.id.artist, R.id.path ); / 是data_list.xml中定义的组件的资源IDthis.datalist.setAdapter(this.adapter);/* 实现监听部分 */this.datalist.setOnItemClickListener(new OnItemClickListener() Overridepublic void onItemClick(AdapterView arg0, View arg1, int arg2,long arg3) / TODO Auto-generated method stubIntent it = new Intent(getApplicationContext(),MusicPlayer.class);/ MyListViewDemo.this.startActivity(it);Bundle bd = new Bundle();bd.putInt(name, arg2);it.putExtras(bd); / it.putExtra(“test”, shuju”);startActivity(it);/startActivityForResult(it, code););/* 实现监听部分 */Override/protected void onActivityResult(int requestCode, int resultCode, Intent data) /super.onActivityResult(requestCode, resultCode, data);/if (requestCode = code) /if (resultCode = RESULT_OK) /Intent it = data;/position = it.getExtras().getInt(name);/ else if (resultCode = RESULT_CANCELED) /Toast.makeText(getApplicationContext(), cancled,/Toast.LENGTH_SHORT).show();/2. MusicPlayer.javapackage org.lxh.demo;import java.io.IOException;import javax.xml.datatype.Duration;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.Bundle;import vider.MediaStore;import android.app.Activity;import android.app.Service;import android.app.DownloadManager.Query;import android.content.Intent;import android.database.Cursor;import android.util.Log;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.EditText;import android.widget.ImageButton;import android.widget.ImageView;import android.widget.ListView;import android.widget.SeekBar;import android.widget.SimpleCursorAdapter;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.TextView;import android.widget.Toast;public class MusicPlayer extends Activity / private ListView datalist = null;/ String cols = new String MediaStore.Audio.Media.TITLE,/ MediaStore.Audio.Media.ARTIST,/ MediaStore.Audio.Media.DATA ;/ int ids = new intR.id.trackname, R.id.artist, R.id.path;/ SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,/ R.layout.listitem,/ cursor, cols, ids);/ this.datalist.setAdapter(adapter);private ImageView fh;private Cursor cursor;/ 1.使用Mediastore进行查询时，需要一个curor。private String _paths;/ 13.建这个数组保存查询到的信息private String _titles;/ 14.建这个数组保存查询到的信息private String _artists;/ 15.建这个数组保存查询到的信息private TextView music_title;/ 23.定义这两个控件分别显示音乐名称和歌唱者private TextView music_artist;/ 23.定义这两个控件分别显示音乐名称和歌唱者private SeekBar seekBar;private TextView music_currentTime;private TextView music_duration;private ImageView last;private ImageView play_pause;private ImageView next;private ImageView btnLower = null;private ImageView btnUpper = null;private AudioManager audioManager = null;private ImageView xunhuan;public MediaPlayer mediaPlayer;/ 25.定义一个mediaPlayerpublic int position = 0;/ 29.定义一个position，记录当前播放的位置，如果要进项下一首就对position进项加1。private String TAG = MusicPlayer;/ 12.定义一下tag，以便将信息打印在控制台上。MediaPlayer my_player= new MediaPlayer();Overrideprotected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);setContentView(R.layout.music_player);fh = (ImageView) findViewById(R.id.fanhuiliebiao);btnLower = (ImageView) findViewById(R.id.btnLower);btnUpper = (ImageView) findViewById(R.id.btnUpper);xunhuan =(ImageView) findViewById(R.id.xunhuan);audioManager = (AudioManager) getSystemService(Service.AUDIO_SERVICE);getMusicFile();/ 2.获取音乐文件init();/ 22.新建方法，并接下来进行各个控件的初始化Bundle bd2 = getIntent().getExtras();position = bd2.getInt(name);playMusic(position);play_pause.setImageResource(R.drawable.pause);music_title.setText(_titlesposition);music_artist.setText(_artistsposition);/ mediaPlayer.stop();/ mediaPlayer.release();/ mediaPlayer = new MediaPlayer();/ try / mediaPlayer.setDataSource(_pathsposition);/ mediaPlayer.prepare();/ catch (IllegalArgumentException e) / / TODO Auto-generated catch block/ e.printStackTrace();/ catch (IllegalStateException e) / / TODO Auto-generated catch blo