我正在尝试制作一个音频流应用程序，其url存储在数组列表中。我的asynctask正在缓冲但不播放url中的音频。我到处找答案，但都没找到。我看过的网站：https://www.codeproject.com/questions/1204993/how-do-i-stream-audio-on-android-using-url

package com.koddev.notificationmusicplayer;

import androidx.appcompat.app.AppCompatActivity;

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.ProgressDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.provider.MediaStore;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import com.koddev.notificationmusicplayer.Services.OnClearFromRecentService;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements Playable {

    ImageButton play;
    TextView title;
    private MediaPlayer mPlayer;
    NotificationManager notificationManager;
    private boolean initialStage = true;
    private ProgressDialog progressDialog;
    private boolean playPause;

    List<Track> tracks;
    int position = 0;
    String music;
    boolean isPlaying = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        play = (ImageButton) findViewById(R.id.play);
        title = findViewById(R.id.title);
        mPlayer = new MediaPlayer();
        mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        progressDialog = new ProgressDialog(this);

        popluateTracks();

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            createChannel();
            registerReceiver(broadcastReceiver, new IntentFilter("TRACKS_TRACKS"));
            startService(new Intent(getBaseContext(), OnClearFromRecentService.class));
        }

        play.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                if (isPlaying){
                    onTrackPause();
                } else {
                    onTrackPlay();
                }

            }
        });
    }

    private void createChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            NotificationChannel channel = new NotificationChannel(CreateNotification.CHANNEL_ID,
                    "KOD Dev", NotificationManager.IMPORTANCE_LOW);

            notificationManager = getSystemService(NotificationManager.class);
            if (notificationManager != null){
                notificationManager.createNotificationChannel(channel);
            }
        }
    }

    //populate list with tracks
    private void popluateTracks(){
        tracks = new ArrayList<>();

        tracks.add(new Track("Dubstep", "example",  R.drawable.t1, "www.example1.com/example.mp3"));
        tracks.add(new Track("Sun", "example", R.drawable.t2, "www.example1.com/example.mp3"));
        tracks.add(new Track("Day", "example", R.drawable.t3, "www.example1.com/example.mp3"));
        tracks.add(new Track("Energy", "example", R.drawable.t4, "www.example1.com/example.mp3"));
    }

    BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getExtras().getString("actionname");

            switch (action){
                case CreateNotification.ACTION_PREVIUOS:
                    onTrackPrevious();
                    break;
                case CreateNotification.ACTION_PLAY:
                    if (isPlaying){
                        onTrackPause();
                    } else {
                        onTrackPlay();
                    }
                    break;
                case CreateNotification.ACTION_NEXT:
                    onTrackNext();
                    break;
            }
        }
    };

    class Player extends AsyncTask<String, Void, Boolean> {
        @Override
        protected Boolean doInBackground(String... strings) {
            Boolean prepared = false;

            try {
                mPlayer.setDataSource(strings[0]);
                mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        initialStage = true;
                        playPause = false;

                        mPlayer.stop();
                        mPlayer.reset();
                    }
                });
                mPlayer.prepare();
                prepared = true;
            }catch (Exception e) {
                Log.e("MyAudioStreamingApp", e.getMessage());
                prepared = false;
            }
            return prepared;
        }

        @Override
        protected void onPostExecute(Boolean aBoolean) {
            super.onPostExecute(aBoolean);

            if (progressDialog.isShowing()) {
                progressDialog.cancel();
            }

            mPlayer.start();
            initialStage = false;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            progressDialog.setMessage("Buffering");
            progressDialog.show();
        }
    }

    @Override
    public void onTrackPrevious() {
        position--;
        CreateNotification.createNotification(MainActivity.this, tracks.get(position),
                R.drawable.ic_pause_black_24dp, position, tracks.size()-1);
        title.setText(tracks.get(position).getTitle());
        onTrackPause();
    }

    @Override
    public void onTrackPlay() {

        CreateNotification.createNotification(MainActivity.this, tracks.get(position), R.drawable.ic_pause_black_24dp, position, tracks.size()-1);
        play.setImageResource(R.drawable.ic_pause_black_24dp);
        title.setText(tracks.get(position).getTitle());
        isPlaying = false;
        music = (tracks.get(position).getMusic());
        Toast toast = Toast.makeText(MainActivity.this, music , Toast.LENGTH_LONG);
        toast.show();
        if (!playPause) {

            if (initialStage) {
                new Player().execute(music);
            } else {
                if(!mPlayer.isPlaying()) {
                    mPlayer.start();
                }
                playPause = true;
            }

        } else {

            if (mPlayer.isPlaying()) {
                mPlayer.pause();
            }
            playPause = false;
        }
        }

    @Override
    protected void onPause() {
        super.onPause();
        if (mPlayer !=null) {
            mPlayer.reset();
            mPlayer.release();
            mPlayer = null;
        }
    }

    @Override
    public void onTrackPause() {

        CreateNotification.createNotification(MainActivity.this, tracks.get(position),
                R.drawable.ic_play_arrow_black_24dp, position, tracks.size()-1);
        play.setImageResource(R.drawable.ic_play_arrow_black_24dp);
        title.setText(tracks.get(position).getTitle());
        isPlaying = false;
        mPlayer.pause();

    }

    @Override
    public void onTrackNext() {

        position++;
        CreateNotification.createNotification(MainActivity.this, tracks.get(position),
                R.drawable.ic_pause_black_24dp, position, tracks.size()-1);
        title.setText(tracks.get(position).getTitle());
        onTrackPause();
        mPlayer.reset();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            notificationManager.cancelAll();
        }

        unregisterReceiver(broadcastReceiver);
    }
}