基于Service的音乐播放器

简易音乐播放器

效果代码Service.javaActivity.java布局清单文件

效果

代码

Service.java

public class MusicFunctionService extends Service { public ArrayList<String> musicList = null; public ArrayList<Song> songs = new ArrayList<>(); public MediaPlayer mediaPlayer; public Handler handler; private SeekBar seekBar; public int type = 1; public int current = 0; public class MusicBinder extends Binder{ public MusicFunctionService get(){ return MusicFunctionService.this; } } @Override public void onCreate() { super.onCreate(); handler = new Handler(); seekBar = MediaPlayerTestActivity.seekBar; initDate(); } @Nullable @Override public IBinder onBind(Intent intent) { return new MusicBinder(); } public void initDate(){ musicList = new ArrayList<>(); if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ File file0 = Environment.getExternalStorageDirectory(); File[] files = file0.listFiles(); //所有的文件和文件夹 for(int i = 0;i<files.length;i++){ if(files[i].isFile() && files[i].getName().endsWith(".mp3")){ musicList.add(files[i].getAbsolutePath()); } } } } public void playMusic(String path){ if(mediaPlayer != null && mediaPlayer.isPlaying()){ stopMusic(); } if(mediaPlayer == null){ try { mediaPlayer = new MediaPlayer(); mediaPlayer.setDataSource(path); mediaPlayer.prepareAsync(); mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { @Override public void onPrepared(MediaPlayer mp) { mediaPlayer.start(); //最大值 seekBar.setMax(mediaPlayer.getDuration()); //进度条要移动多次 while() 子线程 每隔多久 sleep() Thread t = new Thread(){ @Override public void run() { super.run(); if(mediaPlayer!= null && mediaPlayer.isPlaying()){ seekBar.setProgress(mediaPlayer.getCurrentPosition()); handler.postDelayed(this,1000); } } }; handler.post(t); } }); } catch (IOException e) { e.printStackTrace(); } } else { mediaPlayer.start(); } //监听音乐播放完 mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { if(mediaPlayer != null) stopMusic(); switch (type){ case 1: if(current < musicList.size() -1){ playMusic(musicList.get(++current)); } else playMusic(musicList.get(current)); break; case 2: int index = new Random().nextInt(musicList.size()-1);//0-3 playMusic(musicList.get(index)); break; case 3: playMusic(musicList.get(current)); break; } } }); } public void stopMusic(){ mediaPlayer.stop(); mediaPlayer.release(); mediaPlayer = null; } public void pauseMusic(){ if(mediaPlayer != null && mediaPlayer.isPlaying()){ mediaPlayer.pause(); } } }

Activity.java

public class MediaPlayerTestActivity extends AppCompatActivity { private ListView listView; public static SeekBar seekBar; public MusicFunctionService mService; public Intent intent; public static final int ORDER_PLAY= 1; public static final int RANDOM_PLAY= 2; public static final int LOOPING_PLAY= 3; ServiceConnection connection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { mService = ((MusicFunctionService.MusicBinder)service).get(); } @Override public void onServiceDisconnected(ComponentName name) { } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_media_player_test); listView = findViewById(R.id.list_music); seekBar = findViewById(R.id.pro1); if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){ requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE},100); } intent = new Intent(this,MusicFunctionService.class); bindService(intent,connection,BIND_AUTO_CREATE); } public void init(){ //listView 适配器有三种：ArrayAdapter(1个TextView) simpleAdapte baseAdapter ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,R.layout.support_simple_spinner_dropdown_item,mService.musicList); listView.setAdapter(arrayAdapter); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { String musicPath = mService.musicList.get(position); mService.current = position; //播放 mService.playMusic(musicPath); } }); seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { //fromUser 是否为用户用滑动的 if(mService.mediaPlayer != null && mService.mediaPlayer.isPlaying() && fromUser == true){ mService.mediaPlayer.seekTo(progress); //手动改动播放进度 } } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { } }); } public void play(View view) { } public void pause(View view) { //正在播放 mService.pauseMusic(); } public void stop(View view) { if(mService.mediaPlayer != null && mService.mediaPlayer.isPlaying()) mService.stopMusic(); } //循环播放 public void circular(View view) { mService.type = Type.LOOPING_PLAY.index; } //顺序播放 public void orderPlay(View view) { mService.type = Type.ORDER_PLAY.index; } public void randomPlay(View view) { mService.type = Type.RANDOM_PLAY.index; } public void next(View view) { } public void loadDate(View view){ init(); } }

布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MediaPlayerTestActivity" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="上一首" android:onClick="next"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="暂停" android:onClick="pause"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="停止" android:onClick="stop"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下一首"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="单曲循环" android:onClick="circular"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="顺序播放" android:onClick="orderPlay"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="随机播放" android:onClick="randomPlay"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="loadDate" android:text="获取数据"/> </LinearLayout> <SeekBar android:id="@+id/pro1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp"/> <ListView android:id="@+id/list_music" android:layout_width="match_parent" android:layout_height="match_parent"> </ListView> </LinearLayout>

清单文件

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <service android:name=".service.MusicFunctionService" />