android mp3 播放器源码

package com.yarin.android.MusicPlayer; import android.app.ListActivity; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.ServiceConnection; import android.database.Cursor; import android.os.Bundle; import android.os.IBinder; import android.provider.MediaStore; import android.view.View; import android.widget.Button; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SimpleCursorAdapter; import android.widget.TextView; public class MusicList extends ListActivity { private MusicPlayerService mMusicPlayerService = null; private MusicInfoController mMusicInfoController = null; private Cursor mCursor = null; private TextView mTextView = null; private Button mPlayPauseButton = null; private Button mStopButton = null; private ServiceConnection mPlaybackConnection = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder service) { mMusicPlayerService = ((MusicPlayerService.LocalBinder)service).getService(); } public void onServiceDisconnected(ComponentName className) { mMusicPlayerService = null; } }; protected BroadcastReceiver mPlayerEvtReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (action.equals(MusicPlayerService.PLAYER_PREPARE_END)) { // will begin to play mTextView.setVisibility(View.INVISIBLE); mPlayPauseButton.setVisibility(View.VISIBLE); mStopButton.setVisibility(View.VISIBLE); mPlayPauseButton.setText(R.string.pause); } else if(action.equals(MusicPlayerService.PLAY_COMPLETED)) { mPlayPauseButton.setText(R.string.play); } } }; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.list_layout); MusicPlayerApp musicPlayerApp=(MusicPlayerApp)getApplication(); mMusicInfoController = (musicPlayerApp).getMusicInfoController(); // bind playback service startService(new Intent(this,MusicPlayerService.class)); bindService(new Intent(this,MusicPlayerService.class), mPlaybackConnection, Context.BIND_AUTO_CREATE); mTextView = (TextView)findViewById(R.id.show_text); mPlayPauseButton = (Button) findViewById(R.id.play_pause_btn); mStopButton = (Button) findViewById(R.id.stop_btn); mPlayPauseButton.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { // Perform action on click if (mMusicPlayerService != null && mMusicPlayerService.isPlaying()) { mMusicPlayerService.pause(); mPlayPauseButton.setText(R.string.play); } else if (mMusicPlayerService != null){ mMusicPlayerService.start(); mPlayPauseButton.setText(R.string.pause); } } }); mStopButton.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { // Perform action on click if (mMusicPlayerService != null ) { mTextView.setVisibility(View.VISIBLE); mPlayPauseButton.setVisibility(View.INVISIBLE); mStopButton.setVisibility(View.INVISIBLE); mMusicPlayerService.stop(); } } }); IntentFilter filter = new IntentFilter(); filter.addAction(MusicPlayerService.PLAYER_PREPARE_END); filter.addAction(MusicPlayerService.PLAY_COMPLETED); registerReceiver(mPlayerEvtReceiver, filter); } protected void onResume() { super.onResume(); mCursor = mMusicInfoController.getAllSongs(); ListAdapter adapter = new MusicListAdapter(this, android.R.layout.simple_expandable_list_item_2, mCursor, new String[]{}, new int[]{}); setListAdapter(adapter); } protected void onListItemClick(ListView l, View v, int position, long id) { super.onListItemClick(l, v, position, id); if (mCursor == null ||mCursor.getCount() == 0) { return; } mCursor.moveToPosition(position); String url = mCursor .getString(mCursor .getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)); mMusicPlayerService.setDataSource(url); mMusicPlayerService.start(); } } /********************************** * *********************************/ class MusicListAdapter extends SimpleCursorAdapter { public MusicListAdapter(Context context, int layout, Cursor c, String[] from, int[] to) { super(context, layout, c, from, to); } public void bindView(View view, Context context, Cursor cursor) { super.bindView(view, context, cursor); TextView titleView = (TextView) view.findViewById(android.R.id.text1); TextView artistView = (TextView) view.findViewById(android.R.id.text2); titleView.setText(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE))); artistView.setText(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST))); //int duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)); } public static String makeTimeString(long milliSecs) { StringBuffer sb = new StringBuffer(); long m = milliSecs / (60 * 1000); sb.append(m < 10 ? "0" + m : m); sb.append(":"); long s = (milliSecs % (60 * 1000)) / 1000; sb.append(s < 10 ? "0" + s : s); return sb.toString(); } }