1,先把歌曲封装成一个类
package com.example.servicemusic;public class Song { private String Title; private String artist; private int duration; private String data; private int size; public Song(String Title, String artist, int duration, String data, int size) { this.Title = Title; this.artist = artist; this.duration = duration; this.data = data; this.size = size; } public Song() { } public String getTitle() { return Title; } public voID setTitle(String Title) { this.Title = Title; } public String getArtist() { return artist; } public voID setArtist(String artist) { this.artist = artist; } public int getDuration() { return duration; } public voID setDuration(int duration) { this.duration = duration; } public String getData() { return data; } public voID setData(String data) { this.data = data; } public int getSize() { return size; } public voID setSize(int size) { this.size = size; }}@H_419_11@2,封装查询本地歌曲的工具类
package com.example.servicemusic;import androID.content.ContentResolver;import androID.content.Context;import androID.database.Cursor;import androID.net.Uri;import androID.provIDer.MediaStore;import java.util.ArrayList;import java.util.List;public class Utils { private Context context; private List<Song> List; public Utils(Context context, List<Song> List) { this.context = context; this.List = List; } public static List<Song> init(Context context){ List<Song> List=new ArrayList<>(); //获取音乐的uri Uri uri= MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; String[] strings={MediaStore.Audio.Media.Title,MediaStore.Audio.Media.ARTIST,MediaStore.Audio.Media.DURATION,MediaStore.Audio.Media.DATA,MediaStore.Audio.Media.SIZE}; ContentResolver contentResolver = context.getContentResolver(); Cursor cursor = contentResolver.query(uri, strings, null, null, null); while (cursor.movetoNext()){ //获取音乐的歌名,作者,时长,地址 String Title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.Title)); String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)); int duration = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION)); String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA)); int size = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE)); Song song = new Song(Title,artist,duration,data,size); List.add(song); } cursor.close(); return List; }}@H_419_11@3 ,封装一个adapter类
package com.example.servicemusic;import androID.content.Context;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.BaseAdapter;import androID.Widget.TextVIEw;import java.util.List;public class Myadpater extends BaseAdapter { private Context context; private List<Song> List; public Myadpater(Context context, List<Song> List) { this.context = context; this.List = List; } @OverrIDe public int getCount() { return List.size(); } @OverrIDe public Object getItem(int position) { return List.get(position); } @OverrIDe public long getItemID(int position) { return position; } @OverrIDe public VIEw getVIEw(int position, VIEw convertVIEw, VIEwGroup parent) { VIEwholder vIEwholder; if (convertVIEw==null){ convertVIEw = LayoutInflater.from(context).inflate(R.layout.layout, null); vIEwholder=new VIEwholder(); vIEwholder.Title=convertVIEw.findVIEwByID(R.ID.TitleID); vIEwholder.artist = convertVIEw.findVIEwByID(R.ID.artistID); vIEwholder.duration=convertVIEw.findVIEwByID(R.ID.durationID); convertVIEw.setTag(vIEwholder); }else { vIEwholder = (VIEwholder) convertVIEw.getTag(); } vIEwholder.Title.setText(List.get(position).getTitle()); vIEwholder.artist.setText(List.get(position).getArtist()); int time = List.get(position).getDuration(); String s = formatTime(time); vIEwholder.duration.setText(s); return convertVIEw; } class VIEwholder{ TextVIEw Title; TextVIEw artist; TextVIEw duration; } //时长转化为分钟:秒钟 public static String formatTime(int time) { if (time / 1000 % 60 < 10) { return time / 1000 / 60 + ":0" + time / 1000 % 60; } else { return time / 1000 / 60 + ":" + time / 1000 % 60; } }}@H_419_11@4, adapter中的布局
<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" androID:layout_wIDth="match_parent" androID:layout_height="match_parent"> <linearLayout androID:layout_weight="1" androID:layout_wIDth="0dp" androID:orIEntation="vertical" androID:layout_height="wrap_content"> <TextVIEw androID:ID="@+ID/TitleID" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:text="我是歌名" androID:layout_margin="10dp" /> <TextVIEw androID:ID="@+ID/artistID" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:text="我是歌手" androID:layout_margin="10dp" /> </linearLayout> <linearLayout androID:layout_wIDth="0dp" androID:layout_height="78dp" androID:layout_weight="0.5" androID:gravity="center"> <TextVIEw androID:ID="@+ID/durationID" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:layout_margin="20dp" androID:text="我是时长" /> </linearLayout></linearLayout>@H_419_11@5,服务中的所有代码
package com.example.servicemusic;import androID.app.Service;import androID.content.Intent;import androID.media.MediaPlayer;import androID.os.Binder;import androID.os.IBinder;import java.io.IOException;import java.util.List;public class MyService extends Service { private MediaPlayer mediaPlayer; private List<Song> List; private int index; public MyService() { } @OverrIDe public voID onCreate() { super.onCreate(); mediaPlayer=new MediaPlayer(); List=Utils.init(this); } @OverrIDe public IBinder onBind(Intent intent) { return new Musicbinder(); } //中间人 public class Musicbinder extends Binder{ public voID callPlay(int posation){ playsong(posation); index=posation; } public voID callPause(){ pause(); } public voID callplaynextsong(){ if (++index>List.size()-1){ index=0; } playsong(index); } public voID callrestart(){ restart(); } public voID callbacksong(){ if (--index<0){ index=0; } playsong(index); } } private voID restart(){ mediaPlayer.start(); } private voID pause(){ if (mediaPlayer.isPlaying()){ mediaPlayer.pause(); } } //播放歌曲 private voID playsong(int position){ if (mediaPlayer.isPlaying()){ mediaPlayer.stop(); } //重置 mediaPlayer.reset(); //取到点击歌曲文件的位置 Song song = List.get(position); try { mediaPlayer.setDataSource(song.getData()); mediaPlayer.prepareAsync(); mediaPlayer.setonPreparedListener(new MediaPlayer.OnPreparedListener() { @OverrIDe public voID onPrepared(MediaPlayer mp) { mediaPlayer.start(); } }); } catch (IOException e) { e.printstacktrace(); } }}@H_419_11@6 Activity中的布局.
<?xml version="1.0" enCoding="utf-8"?><relativeLayout 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=".MainActivity"> <ListVIEw androID:ID="@+ID/ListID" androID:layout_wIDth="match_parent" androID:layout_height="match_parent"></ListVIEw> <linearLayout androID:gravity="center" androID:layout_alignParentBottom="true" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content"> <button androID:ID="@+ID/continueID" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:text="继续播放" /> <button androID:ID="@+ID/stopID" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:text="暂停播放" /> <button androID:ID="@+ID/backID" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:text="上一首" /> <button androID:ID="@+ID/nextID" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:text="下一首" /> </linearLayout></relativeLayout>@H_419_11@7 Activity中的代码
package com.example.servicemusic;import androID.Manifest;import androID.app.Service;import androID.content.Componentname;import androID.content.Intent;import androID.content.ServiceConnection;import androID.content.pm.PackageManager;import androID.os.Build;import androID.os.IBinder;import androID.support.annotation.NonNull;import androID.support.v7.app.AppCompatActivity;import androID.os.Bundle;import androID.vIEw.VIEw;import androID.Widget.AdapterVIEw;import androID.Widget.button;import androID.Widget.ListVIEw;import java.util.List;public class MainActivity extends AppCompatActivity implements VIEw.OnClickListener{ private ListVIEw ListID; private button continueID; private button stopID; private button backID; private button nextID; private List<Song> List; private Myadpater myadpater; private int index; private ServiceConnection connection; private MyService.Musicbinder biner; @OverrIDe protected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.activity_main); vIEwinit(); if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){ requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},101); } ListID.setonItemClickListener(new AdapterVIEw.OnItemClickListener() { @OverrIDe public voID onItemClick(AdapterVIEw<?> parent, VIEw vIEw, int position, long ID) { biner.callPlay(position); } }); Intent intent = new Intent(this, MyService.class); //1.启动 startService(intent); connection =new ServiceConnection() { @OverrIDe public voID onServiceConnected(Componentname name, IBinder service) { biner =(MyService.Musicbinder)service; } @OverrIDe public voID onServicedisconnected(Componentname name) { } }; //2.绑定 bindService(intent,connection, Service.BIND_auto_CREATE); } @OverrIDe public voID onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if (requestCode==101&&grantResults[0]== PackageManager.PERMISSION_GRANTED){ List<Song> init = Utils.init(this); myadpater = new Myadpater(this, init); ListID.setAdapter(myadpater); } } private voID vIEwinit() { ListID = (ListVIEw) findVIEwByID(R.ID.ListID); continueID = (button) findVIEwByID(R.ID.continueID); continueID.setonClickListener(this); stopID = (button) findVIEwByID(R.ID.stopID); stopID.setonClickListener(this); backID = (button) findVIEwByID(R.ID.backID); backID.setonClickListener(this); nextID = (button) findVIEwByID(R.ID.nextID); nextID.setonClickListener(this); } @OverrIDe public voID onClick(VIEw v) { int ID = v.getID(); switch (ID){ case R.ID.stopID: biner.callPause(); break; case R.ID.continueID: biner.callrestart(); break; case R.ID.nextID: biner.callplaynextsong(); break; case R.ID.backID: biner.callbacksong(); break; } }}@H_419_11@以上是内存溢出为你收集整理的使用MediaPlayer+Service完成音乐播放器全部内容，希望文章能够帮你解决使用MediaPlayer+Service完成音乐播放器所遇到的程序开发问题。
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