Android入门之本地音乐播放器

2024-01-09 10:34| 来源: 网络整理| 查看: 265

功能简介读取模拟器中音乐文件；列表展示，获取歌曲详细信息：歌名、歌手名、专辑名、专辑封面、播放时间等；基本功能：上下切歌，播放暂停、进度条显示与点击跳转。成品效果图： Android音乐播放器

Mediaplayer基本状态

Mediaplayer播放器主要涉及以下状态，通过调用图中函数进行状态跳转。

Idle //mPlayer刚被创建或者重置之后还未被初始化时的状态;Initialized //setDataSource()加载资源后进入初始化状态；Preparing和Prepared //Preparing是准备中状态, Prepared是就绪状态,可进行播放属性的设置。Started和Paused //播放和暂停状态，调用start()和pause()进行跳转Stop //停止状态，当在某个时刻调用了stop()之后，就需要再次调用prepare()使mPlayer转到就绪状态。PlaybackCompleted //播放完毕状态，如果设置了循环播放模式，当播放完毕的时候，mPlayer会重新进入到Started状态End //End是结束状态，当调用release()时，会释放播放引擎中与mPlayer相关的资源，这时就无法再转换到其他状态了。Error //当mPlayer出现一些错误（例如，格式错误），就会调用OnErrorListener.OnError()方法进入到Error状态。在这里插入图片描述

项目难点详解添加资源文件工程项目添加项目res资源文件夹 -> 新建raw资源文件夹 -> 添加资源 raw资源加载

模拟器添加音乐 1.打开模拟器存储目录，运行模拟器 -> View -> Tools Windows -> Device File Explorer； 2.存储音乐至sdcard/Music/ 或storage/emulated/0/Music/； 3.右键点击Upload，选择音乐资源加载。在这里插入图片描述

权限静态权限读权限&写权限，直接声明使用 [AndroidManifest.xml] 动态权限因为涉及SD卡读取，需要使用动态权限，Android6.0后权限分为静态权限与动态权限，需要分开定义。如果读取工程项目中指定资源资源文件，使用静态权限即可。 [MainActivity.java] 中声明使用，分为权限获取函数及其回调函数 //动态权限申请函数 if (ContextCompat.checkSelfPermission( MainActivity.this, Manifest.permission.WRITE_APN_SETTINGS ) != PackageManager.PERMISSION_GRANTED) //判断是否已经授权 { //申请权限三个参数：1.Activity实例；2.String数组，存放权限；3.唯一请求码 ActivityCompat.requestPermissions( MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, 1 ); }else{ //填写功能函数 loadLocalMusicData(); //权限请求失败，则加载本地数据源，请求成功则调用回调函数中的加载，不管成功与否都会调用 } //动态权限获取函数的回调函数 @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult( requestCode, permissions, grantResults ); switch (requestCode) { case 1: if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { //填写功能函数 loadLocalMusicData(); //申请权限成功，扫描模拟器存储，加载资源 } else { finish(); Toast.makeText( this, "denied！", Toast.LENGTH_SHORT ).show(); } } } 媒体库资源更新

在模拟器中添加资源，并通过动态权限进行读取的过程中，Android系统并不会时时全局扫描资源，通常开关机模拟器时才扫描，所以需要进行媒体库的主动扫描资源。

private void loadLocalMusicData() { /* 更新媒体库mp3文件*/ String file_path = "storage/emulated/0/Music"; MediaScannerConnection.scanFile( this, new String[]{file_path.toString()}, // null, new String[]{"mp3"}, //指定扫描mp3文件，缩短时间 new MediaScannerConnection.OnScanCompletedListener() { @Override public void onScanCompleted(String path, Uri uri) { Log.i( "ExternalStorage", "Scanned" + path + ":" ); Log.i( "ExternalStorage", "->" + uri); } } ); 读取Android多媒体资源文件

这里使用MediaStore库，其是android系统提供的一个多媒体数据库，专门用于存放多媒体信息的，通过ContentResolver即可对数据库进行操作。

MediaStore.Files: 共享的文件,包括多媒体和非多媒体信息MediaStore.Audio: 存放音频信息MediaStore.Image: 存放图片信息MediaStore.Vedio: 存放视频信息

模块化读取资源信息，如mp3文件中的歌曲名、歌手名、专辑名、时长、存放路径等信息。

MediaStore.Audio.Media.TITLE //歌曲标题MediaStore.Audio.Media.ARTIST //歌手名MediaStore.Audio.Media.ALBUM //专辑名MediaStore.Audio.Media.DATA //路径MediaStore.Audio.Media.DURATION //视频时长MediaStore.Audio.Media.ALBUM_ID //相册名 [MainActivity.java] /* 加载本地存储当中的音乐mp3文件到集合当中*/ // 1.获取ContentResolver对象 ContentResolver resolver = getContentResolver(); // 2.获取本地音乐存储的Uri地址 Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; // 3 开始查询地址查询接口 Cursor cursor = resolver.query(uri, null, null, null, null); // 4.遍历Cursor int id = 0; while (cursor.moveToNext()) { String song = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)); //歌曲标题 String singer = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)); //歌手名 String album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM)); //专辑名 id++; String sid = String.valueOf(id); //序列号 String path = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA)); //路径 long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION)); //视频时长 SimpleDateFormat sdf = new SimpleDateFormat("mm:ss"); String time = sdf.format(new Date(duration)); // 获取专辑图片主要是通过album_id进行查询 String album_id = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));//相册名 String albumArt = getAlbumArt(album_id); // 将一行当中的数据封装到对象当中 LocalMusicBean bean = new LocalMusicBean(sid, song, singer, album, time, path, albumArt); //每一首歌的信息封装 mDatas.add(bean); } // 数据源变化，提示适配器更新 adapter.notifyDataSetChanged(); 获取歌曲封面 //获取歌曲的封面 private void loadCover(String path){ MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever(); mediaMetadataRetriever.setDataSource( path ); byte[] cover = mediaMetadataRetriever.getEmbeddedPicture(); Bitmap bitmap = BitmapFactory.decodeByteArray( cover, 0, cover.length ); albumIv.setImageBitmap( bitmap ); } 获取歌曲的时间以及进度条跳转两个TextView：tv_star, tv_end分别时时显示当前时间，时间总长；一个SeekBar实现进度动态显示与跳转；延时50ms更新时间进度条；SeekBar回调函数，点击时、移动时、确定时。 private void SeekBarSet(){ /*新增seekbar进度条*/ int duration = mediaPlayer.getDuration(); //获取视频总时间 seekBar.setMax( duration ); //将音乐总时间设置为Seekbar的最大值 Timer timer = new Timer( ); timer.schedule( new TimerTask() { @Override public void run() { // if (!currentPausePositionInSong){ seekBar.setProgress( mediaPlayer.getCurrentPosition() ); // } } },0,50); seekBar.setOnSeekBarChangeListener( new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int i, boolean b) { int time_end = mediaPlayer.getDuration() / 1000 ; //获取视频时长 tv_end.setText(calaculateTime( time_end )); int time_now = mediaPlayer.getCurrentPosition() / 1000; tv_star.setText(calaculateTime( time_now ) ); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { mediaPlayer.seekTo( seekBar.getProgress() ); // tv_star.setText(formattime( mediaPlayer.getCurrentPosition() )); } } ); } 项目部分代码使用控件列表控件类型功能详细控件ImageView图形按键上一首、下一首、播放、暂停TextView文本栏歌曲名、歌手名、专辑名、单前播放时间、总时长RecyclerView滑动列表加载各歌曲信息的列表LocalMusicAdapter横条信息展示栏加载每一首歌曲信息的基本信息SeekBar进度条显示当前歌曲进度信息

基本控件为以上所述，前端代码就不贴了

项目详细代码

[MainActivity.java] 主类，包含各控件定义与各监听器定义及功能

package com.example.musicplayer_2; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; import android.Manifest; import android.content.ContentResolver; import android.content.Intent; import android.content.pm.PackageManager; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.media.MediaMetadataRetriever; import android.media.MediaPlayer; import android.media.MediaScannerConnection; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.SeekBar; import android.widget.TextView; import android.widget.Toast; import java.io.File; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Timer; import java.util.TimerTask; public class MainActivity extends AppCompatActivity implements View.OnClickListener { private MediaPlayer mediaPlayer; private ImageView nextIv,playIv,lastIv,albumIv; //图像控件： private TextView singerTv,songTv; //文本信息：歌手名、歌名 private RecyclerView musicRv; //类似ListView 可横向滚动 private SeekBar seekBar; private TextView tv_star, tv_end; private List mDatas; //数据源自定义类数组存放各歌曲信息 private LocalMusicAdapter adapter; //歌曲横条信息控件设置 private int currnetPlayPosition = -1; //记录当前正在播放的音乐的位置 private int currentPausePositionInSong = 0; //记录暂停音乐时进度条的位置 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate( savedInstanceState ); setContentView( R.layout.activity_main ); initView(); //控件定义与绑定减少代码量 mediaPlayer = new MediaPlayer(); mDatas = new ArrayList(); //任意类型数组 //创建适配器对象 adapter = new LocalMusicAdapter(this, mDatas); //传参context，mDatas musicRv.setAdapter(adapter); //设置布局管理器 LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false); musicRv.setLayoutManager(layoutManager); //动态权限申请 if (ContextCompat.checkSelfPermission( MainActivity.this, Manifest.permission.WRITE_APN_SETTINGS ) != PackageManager.PERMISSION_GRANTED) //判断是否已经授权 { //申请权限三个参数：1.Activity实例；2.String数组，存放权限；3.唯一请求码 ActivityCompat.requestPermissions( MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, 1 ); }else{ loadLocalMusicData(); //权限请求失败，则加载本地数据源，请求成功则调用回调函数中的加载，不管成功与否都会调用 } // loadLocalMusicData(); //加载本地数据源 setEventListener(); //设置每一项的点击事件 } //动态权限获取函数的回调函数 @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult( requestCode, permissions, grantResults ); switch (requestCode) { case 1: if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { loadLocalMusicData(); //申请权限成功，扫描模拟器存储，加载资源 } else { finish(); Toast.makeText( this, "denied！", Toast.LENGTH_SHORT ).show(); } } } private void loadLocalMusicData() { /* 更新媒体库mp3文件*/ String file_path = "storage/emulated/0/Music"; MediaScannerConnection.scanFile( this, new String[]{file_path.toString()}, // null, new String[]{"mp3"}, new MediaScannerConnection.OnScanCompletedListener() { @Override public void onScanCompleted(String path, Uri uri) { Log.i( "ExternalStorage", "Scanned" + path + ":" ); Log.i( "ExternalStorage", "->" + uri); } } ); /* 加载本地存储当中的音乐mp3文件到集合当中*/ // 1.获取ContentResolver对象 ContentResolver resolver = getContentResolver(); // 2.获取本地音乐存储的Uri地址 Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; // 3 开始查询地址查询接口 Cursor cursor = resolver.query(uri, null, null, null, null); // 4.遍历Cursor int id = 0; while (cursor.moveToNext()) { String song = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)); //歌曲标题 String singer = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)); //歌手名 String album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM)); //专辑名 id++; String sid = String.valueOf(id); //序列号 String path = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA)); //路径 long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION)); //视频时长 SimpleDateFormat sdf = new SimpleDateFormat("mm:ss"); String time = sdf.format(new Date(duration)); // 获取专辑图片主要是通过album_id进行查询 String album_id = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));//相册名 String albumArt = getAlbumArt(album_id); // 将一行当中的数据封装到对象当中 LocalMusicBean bean = new LocalMusicBean(sid, song, singer, album, time, path, albumArt); //每一首歌的信息封装 mDatas.add(bean); } // 数据源变化，提示适配器更新 adapter.notifyDataSetChanged(); } private void initView() { /* 初始化控件的函数*/ 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); albumIv = findViewById(R.id.local_music_bottom_iv_icon); 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); seekBar = findViewById( R.id.local_music_bottom_tv_time ); //进度条定义 tv_star = findViewById( R.id.local_music_bottom_tv_time_star ); tv_end = findViewById( R.id.local_music_bottom_tv_time_end ); } private void setEventListener() { /* 设置每一项的点击事件*/ adapter.setOnItemClickListener(new LocalMusicAdapter.OnItemClickListener() { @Override public void OnItemClick(View view, int position) { currnetPlayPosition = position; LocalMusicBean musicBean = mDatas.get(position); playMusicInMusicBean(musicBean); } }); } public void playMusicInMusicBean(LocalMusicBean musicBean) { //传入一首歌信息 /*根据传入对象播放音乐*/ //设置底部显示的歌手名称和歌曲名 singerTv.setText(musicBean.getSinger()); //获取当前信息并设置 songTv.setText(musicBean.getSong()); stopMusic(); // 重置多媒体播放器 mediaPlayer.reset(); // 设置新的播放路径 try { mediaPlayer.setDataSource(musicBean.getPath()); String albumArt = musicBean.getAlbumArt(); Log.i("lsh123", "playMusicInMusicBean: albumpath=="+albumArt); Bitmap bm = BitmapFactory.decodeFile(albumArt); Log.i("lsh123", "playMusicInMusicBean: bm=="+bm); albumIv.setImageBitmap(bm); playMusic(); SeekBarSet(); //设置进度条及其时间显示 loadCover(musicBean.getPath()); } catch (Exception e) { e.printStackTrace(); } } private void SeekBarSet(){ /*新增seekbar进度条*/ int duration = mediaPlayer.getDuration(); //获取视频总时间 seekBar.setMax( duration ); //将音乐总时间设置为Seekbar的最大值 Timer timer = new Timer( ); timer.schedule( new TimerTask() { @Override public void run() { // if (!currentPausePositionInSong){ seekBar.setProgress( mediaPlayer.getCurrentPosition() ); // } } },0,50); seekBar.setOnSeekBarChangeListener( new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int i, boolean b) { int time_end = mediaPlayer.getDuration() / 1000 ; //获取视频时长 tv_end.setText(calaculateTime( time_end )); int time_now = mediaPlayer.getCurrentPosition() / 1000; tv_star.setText(calaculateTime( time_now ) ); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { mediaPlayer.seekTo( seekBar.getProgress() ); // tv_star.setText(formattime( mediaPlayer.getCurrentPosition() )); } } ); } /* * 点击播放按钮播放音乐，或者暂停从新播放 * 播放音乐有两种情况： * 1.从暂停到播放 * 2.从停止到播放 * */ private void playMusic() { /* 播放音乐的函数*/ if (mediaPlayer!=null&&!mediaPlayer.isPlaying()) { if (currentPausePositionInSong == 0) { //如果已经停止播放 try { mediaPlayer.prepare(); //重新准备播放 mediaPlayer.start(); } catch (Exception e) { e.printStackTrace(); } }else{ // 从暂停到播放 mediaPlayer.seekTo(currentPausePositionInSong); mediaPlayer.start(); } // playIv.setImageResource(R.mipmap.icon_pause); } } private void pauseMusic() { /* 暂停音乐的函数*/ if (mediaPlayer!=null&&mediaPlayer.isPlaying()) { currentPausePositionInSong = mediaPlayer.getCurrentPosition(); //获取进度条 mediaPlayer.pause(); playIv.setImageResource(R.mipmap.icon_play); } } private void stopMusic() { /* 停止音乐的函数*/ if (mediaPlayer!=null) { currentPausePositionInSong = 0; mediaPlayer.pause(); //播放器暂停 mediaPlayer.seekTo(0); //调至0 mediaPlayer.stop(); //停止 playIv.setImageResource(R.mipmap.icon_play); //显示图标 } } @Override protected void onDestroy() { super.onDestroy(); stopMusic(); } /*进度条时间换算与格式转变*/ //时间格式换算1 public String formattime(long time){ String min= (time/(1000*60))+""; String second= (time%(1000*60)/1000)+""; if(min.length() second = 0 + second; } return min +":"+ second; } //时间格式换算2 public String calaculateTime(int time){ int minute, second; if(time > 60){ minute = time / 60; //分钟取整 second = time % 60; //秒钟取余 //分钟再0~9 if(minute >= 0 && minute return "0"+minute+":"+"0"+second; }else { return "0"+minute+":"+second; } }else { //分钟大于10再判断秒 if(second >= 0 && second return minute+":"+second; } } }else if(time return "00:"+"0"+second; }else { return "00:"+ second; } } return null; } private String getAlbumArt(String album_id) { String mUriAlbums = "content://media/external/audio/albums"; String[] projection = new String[]{"album_art"}; Cursor cur = this.getContentResolver().query( Uri.parse(mUriAlbums + "/" + album_id), projection, null, null, null); String album_art = null; if (cur.getCount() > 0 && cur.getColumnCount() > 0) { cur.moveToNext(); album_art = cur.getString(0); } cur.close(); cur = null; return album_art; } private void loadCover(String path){ MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever(); mediaMetadataRetriever.setDataSource( path ); byte[] cover = mediaMetadataRetriever.getEmbeddedPicture(); Bitmap bitmap = BitmapFactory.decodeByteArray( cover, 0, cover.length ); albumIv.setImageBitmap( bitmap ); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.local_music_bottom_iv_last: //上一首 if (currnetPlayPosition ==0) { Toast.makeText(this,"已经是第一首了，没有上一曲！",Toast.LENGTH_SHORT).show(); return; } currnetPlayPosition = currnetPlayPosition-1; //序号索引-1 LocalMusicBean lastBean = mDatas.get(currnetPlayPosition); //从数组中获取上一首信息 playMusicInMusicBean(lastBean); break; case R.id.local_music_bottom_iv_next: //下一首 if (currnetPlayPosition ==mDatas.size()-1) { Toast.makeText(this,"已经是最后一首了，没有下一曲！",Toast.LENGTH_SHORT).show(); return; } currnetPlayPosition = currnetPlayPosition+1; LocalMusicBean nextBean = mDatas.get(currnetPlayPosition); playMusicInMusicBean(nextBean); break; case R.id.local_music_bottom_iv_play: if (currnetPlayPosition == -1) { // 并没有选中要播放的音乐 Toast.makeText(this,"请选择想要播放的音乐",Toast.LENGTH_SHORT).show(); return; } if (mediaPlayer.isPlaying()) { // 此时处于播放状态，需要暂停音乐 pauseMusic(); }else { // 此时没有播放音乐，点击开始播放音乐 playMusic(); } break; } } }

[LocalMusicBean.java] 歌曲信息封装类，包含歌曲各信息

package com.example.musicplayer_2; /** * author : harrison * e-mail : [email protected] * data : zfx上午10:29 * version: 1.0 */ public class LocalMusicBean { private String id; //歌曲id private String song; //歌曲名称 private String singer; //歌手名称 private String album; //专辑名称 private String duration; //歌曲时长 private String path; //歌曲路径 private String albumArt; //专辑地址 public LocalMusicBean() { } public LocalMusicBean(String id, String song, String singer, String album, String duration, String path, String albumArt) { this.id = id; this.song = song; this.singer = singer; this.album = album; this.duration = duration; this.path = path; this.albumArt = albumArt; } 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; } public String getAlbumArt() { return albumArt; } public void setAlbumArt(String albumArt) { this.albumArt = albumArt; } }

[LocalMusicAdapter.java] 歌曲横向展示类

package com.example.musicplayer_2; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.TextView; import androidx.annotation.NonNull; import androidx.recyclerview.widget.RecyclerView; import java.util.List; /** * author : harrison * e-mail : [email protected] * data : zfx上午10:49 * version: 1.0 */ public class LocalMusicAdapter extends RecyclerView.Adapter{ private Context context; private ListmDatas; private OnItemClickListener onItemClickListener; public void setOnItemClickListener(OnItemClickListener onItemClickListener) { //监听器参数传入 this.onItemClickListener = onItemClickListener; } public interface OnItemClickListener{ public void OnItemClick(View view,int position); } public LocalMusicAdapter(Context context, List mDatas) { //构造函数传入参数 context上下文，数据集 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 v) { onItemClickListener.OnItemClick(v,position); } }); } @Override public int getItemCount() { return mDatas.size(); } class LocalMusicViewHolder extends RecyclerView.ViewHolder{ TextView idTv,songTv,singerTv,albumTv,timeTv; public LocalMusicViewHolder(View itemView) { super(itemView); idTv = itemView.findViewById(R.id.item_local_music_num); //序号 songTv = itemView.findViewById(R.id.item_local_music_song); //歌名 singerTv = itemView.findViewById(R.id.item_local_music_singer); //歌手名 albumTv = itemView.findViewById(R.id.item_local_music_album); //专辑名 timeTv = itemView.findViewById(R.id.item_local_music_durtion); //时间 } } }

前端页面代码较长就不贴了，上表中已列清基本控件使用。挣点积分，后续会上传GitHub，完整工程地址：https://download.csdn.net/download/Harrison509/12894922

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