Android 音乐播放器（暂停、下一首、上一首、进度条、拉动进度条）

1.编写主页面，使用listview组件放置音乐列表信息

2.写Bean类、Adapter适配器

package com.example.myapplication;import java.io.Serializable;public class VideoBean implements Serializable {    private int id;    private String song;    private String singer;    private String album;    private String time;    private int path;    public VideoBean(int id, String song, String singer, String album, String time, int path) {        this.id = id;        this.song = song;        this.singer = singer;        this.album = album;        this.time = time;        this.path = path;    }    public String getTime() {        return time;    }    public String getAlbum() {        return album;    }    public int getId() {        return id;    }    public int getPath() {        return path;    }    public String getSinger() {        return singer;    }    public String getSong() {        return song;    }}

package com.example.myapplication;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.TextView;import java.util.List;public class VideoAdapter extends BaseAdapter {    private List list;    private Context context;    public VideoAdapter(List list, Context context) {        this.list = list;        this.context = context;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int position) {        return position;    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if (convertView==null){            convertView= LayoutInflater.from(context).inflate(R.layout.adaper_video,parent,false);        }        VideoBean bean=list.get(position);        TextView id=convertView.findViewById(R.id.id);        TextView song=convertView.findViewById(R.id.song);        TextView singer=convertView.findViewById(R.id.singer);        TextView album=convertView.findViewById(R.id.album);        TextView time=convertView.findViewById(R.id.time);        id.setText(bean.getId()+"");        song.setText(bean.getSong());        singer.setText(bean.getSinger());        album.setText(bean.getAlbum());        time.setText(bean.getTime());        return convertView;    }}

3.写listview的子布局页面

下载几个mp3音乐导入raw中

4.编写主页面java文件

package com.example.myapplication;import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;import android.media.MediaParser;import android.media.MediaPlayer;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.SeekBar;import android.widget.TextView;import android.widget.Toast;import com.bm.library.PhotoView;import java.io.IOException;import java.util.ArrayList;import java.util.List;import java.util.Locale;public class MainActivity extends AppCompatActivity {    private TextView song,name,next,stop,up,t1,t2;    private ListView video_list;    private List data;    private MediaPlayer mediaPlayer;    private int id=0;    private SeekBar time;    private Handler mHandler = new Handler();    private Runnable mRunnable = new Runnable() {        @Override        public void run() {            if (mediaPlayer != null && mediaPlayer.isPlaying()) {                int mCurrentPosition = mediaPlayer.getCurrentPosition(); // 获取当前播放位置                //总时长                int duration = mediaPlayer.getDuration();                // 计算剩余时长                int timeLeft = duration - mCurrentPosition;                int minutes = timeLeft / 1000 / 60;                int seconds = (timeLeft / 1000) % 60;                t2.setText(String.format(Locale.getDefault(), "%02d:%02d", minutes, seconds));                time.setProgress(mCurrentPosition);                mHandler.postDelayed(this, 1000);            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();        data=new ArrayList();        data.add(new VideoBean(1,"七月上","Jam","七月上","3:10",R.raw.a1));        data.add(new VideoBean(2,"大摇大摆迎春来","大张伟","七月上","2:54",R.raw.a2));        data.add(new VideoBean(3,"抱歉","科德夏萍","陈慧琳","3:56",R.raw.a3));        data.add(new VideoBean(4,"白色恋人","游鸿铭","游鸿铭","4:48",R.raw.a4));        video_list.setAdapter(new VideoAdapter(data,MainActivity.this));        video_list.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView parent, View view, int position, long id) {                  VideoBean bean=data.get(position);                  song.setText(bean.getSong());                  name.setText(bean.getSinger());                  isplaying();                  mediaPlayer=MediaPlayer.create(MainActivity.this,bean.getPath());                  mediaPlayer.start();                  t2.setText("00:00");                  time.setMax(mediaPlayer.getDuration());                  mHandler.post(mRunnable);            }        });        stop.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if (mediaPlayer!=null) {                    if (mediaPlayer.isPlaying()) {                        mediaPlayer.pause();                        stop.setText("开始");                        mHandler.post(mRunnable);                    } else {                        stop.setText("暂停");                        mediaPlayer.start();                        mHandler.post(mRunnable);                    }                }else {                    Toast.makeText(MainActivity.this, "暂未播放音乐", Toast.LENGTH_SHORT).show();                }            }        });        next.setOnClickListener(new View.OnClickListener() {            public void onClick(View v) {                isplaying();                id = (id % data.size()) + 1;                if (id >= data.size()) {                    id = 0;                }                VideoBean bean = data.get(id);                song.setText(bean.getSong());                name.setText(bean.getSinger());                mediaPlayer = MediaPlayer.create(MainActivity.this, bean.getPath());                mediaPlayer.start();                time.setMax(mediaPlayer.getDuration());                mHandler.post(mRunnable);            }        });        up.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                isplaying();                id = id-1;                // 如果索引超出了列表大小，将其重置为0（列表的第一首歌曲）                if (id