android简单音乐播放器源码

package com.liuyang.ClassTest04; import android.app.Activity; 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.Handler; import android.os.IBinder; import android.os.Message; import android.provider.MediaStore; import android.view.KeyEvent; import android.view.View; import android.widget.Button; import android.widget.ImageButton; import android.widget.TextView; import android.widget.Toast; /** * 音乐播放器界面类 * @author Administrator * */ public class MusicPlayerActivity extends Activity { private ImageButton startOrPauseButton; private ImageButton stopButton; private ImageButton frontButton; private ImageButton nextButton; private Button listButton; private TextView songInfoText; private TextView songTimeText; private TextView songVoiceText; /**工具类的引用*/ private MusicPlayerService mpService; /**游标的引用，将会在后面通过赋值让它包含歌曲列表信息*/ private Cursor cursor; /**歌曲播放时间刷新的信号*/ private static final int REFRESHTIME = 0x10000; /**歌曲的音量，初始值为0.5f*/ private float musicVolume = 0.5f; /** * 开启后台服务 */ private ServiceConnection serviceConnection = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder binder) { mpService = ((MusicPlayerService.LocalBinder)binder).getService(); } public void onServiceDisconnected(ComponentName className) { mpService = null; } }; /** * 接受广播 */ protected BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String actionString = intent.getAction(); //收到的广播消息为：音乐播放准备完成 if (actionString.equals(MusicPlayerService.MUSIC_PREPARED_END)) { startOrPauseButton.setImageResource(R.drawable.pause); } else { //收到的广播消息为：当前音乐已经播放完毕 startOrPauseButton.setImageResource(R.drawable.start); //跳到下一曲 nextMusic(); } } }; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //给游标赋值，cursor将包含歌曲列表的信息 cursor = MusicListActivity.mCursor; //开启后台服务 try { startService(new Intent(this, MusicPlayerService.class)); bindService(new Intent(this, MusicPlayerService.class), serviceConnection, Context.BIND_AUTO_CREATE); } catch(Exception e) { Toast.makeText(this, "开启服务失败", Toast.LENGTH_LONG).show(); } //组件的实例化 startOrPauseButton = (ImageButton)this.findViewById(R.id.start_or_pause_btn); stopButton = (ImageButton)this.findViewById(R.id.stop_btn); nextButton = (ImageButton)this.findViewById(R.id.next_btn); frontButton = (ImageButton)this.findViewById(R.id.front_btn); listButton = (Button)this.findViewById(R.id.list_btn); songInfoText = (TextView)this.findViewById(R.id.song_info_text); songTimeText = (TextView)this.findViewById(R.id.song_time_text); songVoiceText = (TextView)this.findViewById(R.id.song_voice_text); //开始/暂停 按钮的事件监听 startOrPauseButton.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { if (mpService != null && mpService.isPlaying()) { mpService.pauseMusic(); startOrPauseButton.setImageResource(R.drawable.start); } else if (mpService != null && MusicListActivity.path != null) { mpService.setDataPath(MusicListActivity.path); mpService.startMusic(); //显示当前播放歌曲的曲名 songInfoText.setText(getSongInfo()); //显示播放音量 songVoiceText.setText(String.valueOf((int)(musicVolume * 10))); startOrPauseButton.setImageResource(R.drawable.pause); } } }); //停止播放按钮事件监听 stopButton.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { if (mpService != null) { songTimeText.setText("00:00"); startOrPauseButton.setImageResource(R.drawable.start); mpService.stopMusic(); } } }); //上一曲按钮事件监听 frontButton.setOnClickListener(new ImageButton.OnClickListener() { public void onClick(View v) { if (mpService != null) { frontMusic(); songInfoText.setText(getSongInfo()); } } }); //下一曲按钮事件监听 nextButton.setOnClickListener(new ImageButton.OnClickListener() { public void onClick(View v) { if (mpService != null) { nextMusic(); songInfoText.setText(getSongInfo()); } } }); //显示列表按钮事件监听 listButton.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { //跳到MusicListActivity，该界面显示歌曲列表信息 Intent intent = new Intent(); intent.setClass(MusicPlayerActivity.this, MusicListActivity.class); startActivity(intent); MusicPlayerActivity.this.finish(); } }); IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(MusicPlayerService.MUSIC_COMPLETED); intentFilter.addAction(MusicPlayerService.MUSIC_PREPARED_END); //注册广播接收器 registerReceiver(broadcastReceiver, intentFilter); //开启线程，更新歌曲播放的时间信息 new Thread(new Runnable() { public void run() { while(true) { Message msg = new Message(); msg.what = MusicPlayerActivity.REFRESHTIME; //通过Handler发送消息 //此处若直接在线程内更新，则会报错，因为线程不是安全的（自己暂时这样肤浅的理解吧） MusicPlayerActivity.this.myHandler.sendMessage(msg); try { Thread.sleep(1000); } catch(Exception e) { e.printStackTrace(); } } } }).start(); } //接受消息，更新歌曲播放时间信息 Handler myHandler = new Handler() { public void handleMessage(Message msg) { if (msg.what == MusicPlayerActivity.REFRESHTIME) { if(mpService != null && mpService.isPlaying()) { songTimeText.setText(makeTimeToString(mpService.getCurrentPosition())); } } } }; //按键弹起事件监听，用于调节音量 public boolean onKeyUp(int keyCode, KeyEvent keyEvent ) { switch(keyCode) { case KeyEvent.KEYCODE_DPAD_UP: //增大音量 if (mpService != null) { musicVolume += 0.1; mpService.setVolume(musicVolume, musicVolume); songVoiceText.setText(String.valueOf((int)(musicVolume * 10))); } return false; case KeyEvent.KEYCODE_DPAD_DOWN: //减少音量 if (mpService != null) { musicVolume -= 0.1; mpService.setVolume(musicVolume, musicVolume); songVoiceText.setText(String.valueOf((int)musicVolume * 10)); } return false; } return false; } /** * 下一曲 */ public void nextMusic() { if ( ++ MusicListActivity.currentPosition >= cursor.getCount()) { //当前播放的歌曲为最后一曲 //跳到第一曲 cursor.moveToFirst(); MusicListActivity.currentPosition = 0; } else { cursor.moveToPosition(MusicListActivity.currentPosition); } //得到下一首歌的文件路径 String uri = cursor.getString( cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)); mpService.setDataPath(uri); mpService.startMusic(); } /** * 上一曲 * 具体参见nextMusic（）的实现 */ public void frontMusic() { if (MusicListActivity.currentPosition ==0) { cursor.moveToLast(); MusicListActivity.currentPosition = cursor.getCount() - 1; } else { cursor.moveToPosition(Mu