本文共 11018 字，大约阅读时间需要 36 分钟。

第一步activity—main.xml
   
       
            
             
             
         
             
             
             
         
        
        
    
   第二步item-local-music.xml
   
       
                    
             
             
             
             
         
        
   第三步  权限 
   第四步 package com.example.mymusic02;import androidx.appcompat.app.AppCompatActivity;import androidx.recyclerview.widget.LinearLayoutManager;import androidx.recyclerview.widget.RecyclerView;import android.content.ContentResolver;import android.database.Cursor;import android.media.MediaParser;import android.media.MediaPlayer;import android.net.Uri;import android.os.Bundle;import android.provider.MediaStore;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;public class MainActivity extends AppCompatActivity implements OnClickListener {
       ImageView nextIv,playIv,lastIv;    TextView singerTv,songTv;    RecyclerView musicRv;    List
   
     mDatas;    private LocalMusicAdater adapter;    private  int position;    int currnetPalyPosition=-1;    int currentPausePositionInSong=0;    MediaPlayer mediaPlayer;    @Override    protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        mediaPlayer=new MediaPlayer();        mDatas=new ArrayList<>();//z这里有两个选择        //创建适配器        adapter=new LocalMusicAdater(this,mDatas);        musicRv.setAdapter(adapter);        //s设置布局管理器        LinearLayoutManager layoutManager=new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);        musicRv.setLayoutManager(layoutManager);        //加载本地数据源        loadLocalMusicData();        //设置点击监听事件        setEventListener();    }    private void setEventListener() {
           adapter.setOnItemClickListener(new LocalMusicAdater.OnItemClickListener() {
               @Override            public void OnItemClick(View view, int position) {
                   currnetPalyPosition=position;                LocalMusicBean musicBean=mDatas.get(position);                playMusicInMusicBean(musicBean);            }        });    }    public void playMusicInMusicBean(LocalMusicBean musicBean) {
           //she设置歌曲名  歌手名字        singerTv.setText(musicBean.getSinger());        songTv.setText(musicBean.getSong());        stopMusic();        //chongz重置多媒体播放器        mediaPlayer.reset();        try {
               mediaPlayer.setDataSource(musicBean.getPath());            palyMusic();        } catch (IOException e) {
               e.printStackTrace();        }    }    private void palyMusic() {
           if(mediaPlayer!=null&&!mediaPlayer.isPlaying()){
               if(currentPausePositionInSong==0){
                   try {
                       mediaPlayer.prepare();                    mediaPlayer.start();                } catch (IOException e) {
                       e.printStackTrace();                }            }else {
                   //zha站厅到                mediaPlayer.seekTo(currentPausePositionInSong);                mediaPlayer.start();            }            playIv.setImageResource(R.mipmap.icon_pause);        }    }    private void pauseMusic() {
               if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
                   currentPausePositionInSong=mediaPlayer.getCurrentPosition();                mediaPlayer.pause();                playIv.setImageResource(R.mipmap.icon_play);            }    }    private void stopMusic() {
           if(mediaPlayer!=null){
               currentPausePositionInSong=0;            mediaPlayer.pause();            mediaPlayer.seekTo(0);            mediaPlayer.stop();            playIv.setImageResource(R.mipmap.icon_play);        }    }    @Override    protected void onDestroy() {
           super.onDestroy();        stopMusic();    }    private void loadLocalMusicData() {
           //加载本地Mp3 文件        // 获取contentResolver对象        ContentResolver resolver=getContentResolver();        //获取本地音乐存储urid        Uri uri= MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;        Cursor cursor=resolver.query(uri,null,null,null,null);        int id=0;        while(cursor.moveToNext()){
               String song = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));            String singer=cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));            String album=cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM));            id++;            String sid=String.valueOf(id);            String path=cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));            long duration=cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));            SimpleDateFormat sdf=new SimpleDateFormat("mm:ss");            String time = sdf.format(new Date(duration));            LocalMusicBean bean=new LocalMusicBean(sid,song,singer,album,time,path);            mDatas.add(bean);        }        adapter.notifyDataSetChanged();    }    private void initView() {
           nextIv=findViewById(R.id.local_music_bottom_iv_next);        playIv=findViewById(R.id.local_music_bottom_iv_play);        lastIv=findViewById(R.id.local_music_bottom_iv_last);        singerTv=findViewById(R.id.local_music_bottom_tv_singer);        songTv=findViewById(R.id.local_music_bottom_tv_song);        musicRv=findViewById(R.id.local_music_rv);        nextIv.setOnClickListener(this);        lastIv.setOnClickListener(this);        playIv.setOnClickListener(this);    }    @Override    public void onClick(View view) {
           switch (view.getId()){
               case R.id.local_music_bottom_iv_last:                if(currnetPalyPosition==0){
                       Toast.makeText(this,"已经是第一首歌曲。",Toast.LENGTH_SHORT).show();                }                currnetPalyPosition=currnetPalyPosition-1;                LocalMusicBean lastBean=mDatas.get(currnetPalyPosition);                playMusicInMusicBean(lastBean);                break;            case R.id.local_music_bottom_iv_next:                    if(currnetPalyPosition==mDatas.size()-1){
                           Toast.makeText(this,"next Music...",Toast.LENGTH_SHORT).show();                    }                    currnetPalyPosition=currnetPalyPosition+1;                    LocalMusicBean nextBean=mDatas.get(currnetPalyPosition);                    playMusicInMusicBean(nextBean);                break;            case R.id.local_music_bottom_iv_play:                if(currnetPalyPosition==-1){
                       Toast.makeText(this, "last Music...", Toast.LENGTH_SHORT).show();                    return;                }                if(mediaPlayer.isPlaying()){
                       pauseMusic();                }else {
                       palyMusic();                }                break;        }    }}第五步LocalMusicAdater.javapackage com.example.mymusic02;import androidx.annotation.NonNull;import androidx.recyclerview.widget.RecyclerView;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import java.util.List;class LocalMusicAdater extends RecyclerView.Adapter
    
     {
       Context context;    List
     
       mDatas;    OnItemClickListener onItemClickListener;    public void setOnItemClickListener(OnItemClickListener onItemClickListener){
           this.onItemClickListener=onItemClickListener;    }    public interface OnItemClickListener{
           public void OnItemClick(View view,int position);    }    public LocalMusicAdater(Context context, List
      
        mDatas) {
           this.context = context;        this.mDatas = mDatas;    }    @NonNull    @Override    public LocalMusicViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
           View view= LayoutInflater.from(context).inflate(R.layout.item_local_music,parent,false);        LocalMusicViewHolder holder=new LocalMusicViewHolder(view);        return holder;    }    @Override    public void onBindViewHolder(@NonNull LocalMusicViewHolder holder, final int position) {
           LocalMusicBean musicBean=mDatas.get(position);        holder.idTv.setText(musicBean.getId());        holder.songTv.setText(musicBean.getSong());        holder.singerTv.setText(musicBean.getSinger());        holder.albumTv.setText(musicBean.getAlbum());        holder.timeTv.setText(musicBean.getDuration());        holder.itemView.setOnClickListener(new View.OnClickListener() {
               @Override            public void onClick(View view) {
                   onItemClickListener.OnItemClick(view,position);            }        });    }    @Override    public int getItemCount() {
           return mDatas.size();    }    class LocalMusicViewHolder extends RecyclerView.ViewHolder{
           TextView idTv,songTv,singerTv,albumTv,timeTv;        public LocalMusicViewHolder(@NonNull View itemView) {
               super(itemView);            idTv=itemView.findViewById(R.id.item_local_music_num);            songTv=itemView.findViewById(R.id.item_local_music_song);            singerTv=itemView.findViewById(R.id.item_local_music_singer);            albumTv=itemView.findViewById(R.id.item_local_music_album);            timeTv=itemView.findViewById(R.id.item_local_music_durtion);        }    }}第六步  LocalMusicBean.javapackage com.example.mymusic02;public class LocalMusicBean {
       private String id;    private String song;    private String singer;    private String album;    private String duration;    private String path;    public LocalMusicBean() {
       }    public LocalMusicBean(String id, String song, String singer, String album, String duration, String path) {
           this.id = id;        this.song = song;        this.singer = singer;        this.album = album;        this.duration = duration;        this.path = path;    }    public String getId() {
           return id;    }    public void setId(String id) {
           this.id = id;    }    public String getSong() {
           return song;    }    public void setSong(String song) {
           this.song = song;    }    public String getSinger() {
           return singer;    }    public void setSinger(String singer) {
           this.singer = singer;    }    public String getAlbum() {
           return album;    }    public void setAlbum(String album) {
           this.album = album;    }    public String getDuration() {
           return duration;    }    public void setDuration(String duration) {
           this.duration = duration;    }    public String getPath() {
           return path;    }    public void setPath(String path) {
           this.path = path;    }    ![请添加图片描述](https://img-blog.csdnimg.cn/20200807023411442.png)
      
     
    
   

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