Android 单击项目时播放特定于Listview的歌曲？

我正在制作Mp3播放器。我已成功从我的设备中获取歌曲名称和艺术家，并将其显示在列表视图中，现在我的问题是，当任何用户单击特定项目时，如果有任何歌曲在播放之前播放，歌曲将播放，它将自动停止并播放用户正在单击的新歌，我还希望从我的列表视图中获取歌曲名称和艺术家名称

MediaPlayer mediaPlayer = new 

MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(url); //use it when your audio is in a network location
mediaPlayer.prepare(); // might take long! (for buffering, etc)
mediaPlayer.start();

请帮我这里的所有代码

package com.monstertechno.musicplayerappui;
import android.Manifest;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.media.MediaPlayer;
import android.net.Uri;
import android.renderscript.Sampler;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.Toast;

import com.karumi.dexter.Dexter;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionDeniedResponse;
import com.karumi.dexter.listener.PermissionGrantedResponse;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.single.PermissionListener;
import com.sothree.slidinguppanel.SlidingUpPanelLayout;
import com.sothree.slidinguppanel.SlidingUpPanelLayout.PanelState;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

    public class MainActivity extends AppCompatActivity {
      MediaPlayer mediaPlayer;
        private ArrayList<Song> songList;
        private ListView songView;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            runtimpermission();
            songView = (ListView) findViewById(R.id.song_list);
            songList = new ArrayList<Song>();
            SongAdapter songAdt = new SongAdapter(this, songList);
            songView.setAdapter(songAdt);
            getSongList();
            Collections.sort(songList, new Comparator<Song>() {
                public int compare(Song a, Song b) {
                    return a.getTitle().compareTo(b.getTitle());
                }
            });

            songView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    if(mediaPlayer!=null){
                        mediaPlayer.release();
                    }



                }
            });

        }




        public void  runtimpermission(){

            Dexter.withActivity(this)
                    .withPermission(Manifest.permission.READ_EXTERNAL_STORAGE)

                    .withListener(new PermissionListener() {
                        @Override public void onPermissionGranted(PermissionGrantedResponse response) {
                            Toast.makeText(MainActivity.this, "Permisson Access", Toast.LENGTH_SHORT).show();

                        }
                        @Override public void onPermissionDenied(PermissionDeniedResponse response) {

                            Toast.makeText(MainActivity.this, "Permisson Denied", Toast.LENGTH_SHORT).show();
                         }
                        @Override


                        public void onPermissionRationaleShouldBeShown(PermissionRequest permission, PermissionToken token) {


                            token.continuePermissionRequest();}
                    }).check();

        }

        public void getSongList() {
            //retrieve song info
            ContentResolver musicResolver = getContentResolver();
            Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
            Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);

            if(musicCursor!=null && musicCursor.moveToFirst()){
                //get columns   
                int titleColumn = musicCursor.getColumnIndex
                        (android.provider.MediaStore.Audio.Media.TITLE);
                int idColumn = musicCursor.getColumnIndex
                        (android.provider.MediaStore.Audio.Media._ID);
                int artistColumn = musicCursor.getColumnIndex
                        (android.provider.MediaStore.Audio.Media.ARTIST);

                //add songs to list
                do {
                    long thisId = musicCursor.getLong(idColumn);
                    String thisTitle = musicCursor.getString(titleColumn);
                    String thisArtist = musicCursor.getString(artistColumn);
                    songList.add(new Song(thisId, thisTitle, thisArtist));
                }
                while (musicCursor.moveToNext());
            }

        }

    }







package com.monstertechno.musicplayerappui;

public class Song {
    private long id;
    private String title;
    private String artist;

    public Song(long songID, String songTitle, String songArtist) {
        id=songID;
        title=songTitle;
        artist=songArtist;
    }

    public long getId() {
        return id;
    }

    public String getTitle() {
        return title;
    }

    public String getArtist() {
        return artist;
    }
}



package com.monstertechno.musicplayerappui;

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.ArrayList;

public class SongAdapter extends BaseAdapter {
    private ArrayList<Song> songs;
    private LayoutInflater songInf;

    public SongAdapter(Context c, ArrayList<Song> theSongs){
        songs=theSongs;
        songInf=LayoutInflater.from(c);
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return songs.size();
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int arg0) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View arg1, ViewGroup parent) {
        LinearLayout songLay = (LinearLayout)songInf.inflate
                (R.layout.musiccustom,parent , false);
        // TODO Auto-generated method stub
        TextView songView = (TextView)songLay.findViewById(R.id.song_title);
        TextView artistView = (TextView)songLay.findViewById(R.id.song_artist);
        //get song using position
        Song currSong = songs.get(position);
        //get title and artist strings
        songView.setText(currSong.getTitle());
        artistView.setText(currSong.getArtist());
        //set position as tag
        songLay.setTag(position);
        return songLay;


    }
}

package com.monstertechno.musicplayerappui；
导入android.Manifest；
导入android.content.ContentResolver；
导入android.content.Context；
导入android.content.DialogInterface；
导入android.content.pm.PackageManager；
导入android.database.Cursor；
导入android.media.MediaPlayer；
导入android.net.Uri；
导入android.renderscript.Sampler；
导入android.support.annotation.NonNull；
导入android.support.v4.app.ActivityCompat；
导入android.support.v7.app.AlertDialog；
导入android.support.v7.app.AppActivity；
导入android.os.Bundle；
导入android.util.Log；
导入android.view.view；
导入android.widget.AdapterView；
导入android.widget.ImageButton；
导入android.widget.ListView；
导入android.widget.Toast；
导入com.karumi.dexter.dexter；
导入com.karumi.dexter.PermissionToken；
导入com.karumi.dexter.listener.PermissionDeniedResponse；
导入com.karumi.dexter.listener.PermissionGrantedResponse；
导入com.karumi.dexter.listener.PermissionRequest；
导入com.karumi.dexter.listener.single.PermissionListener；
导入com.sothree.slidenguppanel.slidenguppannellayout；
导入com.sothree.slidinguppanel.slidinguppannellayout.PanelState；
导入java.util.ArrayList；
导入java.util.Collections；
导入java.util.Comparator；
公共类MainActivity扩展了AppCompatActivity{
媒体播放器；
私人ArrayList歌曲列表；
私有列表视图；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
运行权限（）；
songView=（ListView）findViewById（R.id.song_列表）；
songList=newarraylist（）；
SongAdapter songAdt=新的SongAdapter（此，歌曲列表）；
songView.setAdapter（songAdt）；
getSongList（）；
Collections.sort（songList，newcomparator（）{
公共整数比较（歌曲a、歌曲b）{
返回a.getTitle（）.compareTo（b.getTitle（））；
}
});
songView.setOnItemClickListener（新的AdapterView.OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
如果（mediaPlayer！=null）{
mediaPlayer.release（）；
}
}
});
}
公共无效运行权限（）{
Dexter.withActivity（本）
.withPermission（Manifest.permission.READ\u外部存储）
.withListener（新权限Listener（）{
@在PermissionGranded（PermissionGrandedResponse响应）上覆盖公共无效{
Toast.makeText（MainActivity.this，“Permisson访问”，Toast.LENGTH_SHORT.show（）；
}
@覆盖公共void onPermissionDenied（PermissionDeniedResponse响应）{
Toast.makeText（MainActivity.this，“Permisson Denied”，Toast.LENGTH_SHORT.show（）；
}
@凌驾
public void on PermissionRational应显示（PermissionRequest权限、PermissionToken令牌）{
token.continuePermissionRequest（）；}
}).检查（）；
}
public void getSongList（）{
//检索歌曲信息
ContentResolver musicResolver=getContentResolver（）；
Uri musicUri=android.provider.MediaStore.Audio.Media.EXTERNAL\u CONTENT\u Uri；
游标musicCursor=musicSolver.query（musicUri，null，null，null）；
if（musicCursor！=null&&musicCursor.moveToFirst（））{
//获取列
int titleColumn=musicCursor.getColumnIndex
（android.provider.MediaStore.Audio.Media.TITLE）；
int idColumn=musicCursor.getColumnIndex
（android.provider.MediaStore.Audio.Media.\u ID）；
int artistColumn=musicCursor.getColumnIndex
（android.provider.MediaStore.Audio.Media.ARTIST）；
//将歌曲添加到列表中
做{
long thisId=musicCursor.getLong（idColumn）；
String thisttitle=musicCursor.getString（titleColumn）；
String thisArtist=musicCursor.getString（artistColumn）；
歌曲列表。添加（新歌（thisId，thisTitle，thisArtist））；
}
while（musicCursor.moveToNext（））；
}
}
}
包com.monstertechno.musicplayerappui；
公开课歌曲{
私人长id；
私有字符串标题；
私人弦乐演奏家；
公共歌曲（长歌曲ID、弦乐歌曲标题、弦乐歌手）{
id=songID；
标题=歌曲标题；
艺术家=歌手；
}
公共长getId（）{
返回id；
}
公共字符串getTitle（）{
返回标题；
}
公共字符串getArtist（）{
回归艺术家；
}
}
包com.monstertechno.musicplayerappui；
导入android.content.Context；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.BaseAdapter；
导入android.widget.LinearLayout；
导入android.widget.TextView；
导入java.util.ArrayList；
公共类SongAdapter扩展了BaseAdapter{
私人雅乐歌曲；
私人停车场；
公共SongAdap
Uri fileUri = Uri.withAppendedPath(musicURI,"the name of audio file");
mediaPlayer.setDataSource(fileUri);
mediaPlayer.prepare(); // 
mediaPlayer.start();

String thisDataPath = musicCursor.getString(dataColumn);

Uri uri= Uri.parse("file:///"+song.getPath());

 public void getSongList() {
            //retrieve song info
            ContentResolver musicResolver = getContentResolver();
            Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
            Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);

            if(musicCursor!=null && musicCursor.moveToFirst()){
                //get columns   
                int titleColumn = musicCursor.getColumnIndex
                        (android.provider.MediaStore.Audio.Media.TITLE);
                int idColumn = musicCursor.getColumnIndex
                        (android.provider.MediaStore.Audio.Media._ID);
                int artistColumn = musicCursor.getColumnIndex
                        (android.provider.MediaStore.Audio.Media.ARTIST);
                int dataColumn= musicCursor.getColumnIndex
                        (android.provider.MediaStore.Audio.Media.DATA); //This will get you the column index of the file path

                //add songs to list
                do {
                    long thisId = musicCursor.getLong(idColumn);
                    String thisTitle = musicCursor.getString(titleColumn);
                    String thisArtist = musicCursor.getString(artistColumn);
                    String filePath= musicCursor.getString(dataColumn); //Get the file path from the cursor
                    songList.add(new Song(thisId, thisTitle, thisArtist,filePath)); // Make a list of Song objects along with path of each audio file
                }
                while (musicCursor.moveToNext());
            }

        }

 songView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    if(mediaPlayer!=null){
                        mediaPlayer.release();

                    }
                            Song song=songList.get(position);
                            Toast.makeText(getActivity(),song.getFilePath(),Toast.LENGTH_LONG).show();
                            Uri uri= Uri.parse("file:///"+song.getPath());
                            mediaPlayer.setDataSource(fileUri);
                            mediaPlayer.prepare();
                            mediaPlayer.start();



                }
            });