在Android Studio中为媒体播放器使用多个音频源

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

import java.io.IOException;

public class MainActivity extends AppCompatActivity implements AudioManager.OnAudioFocusChangeListener {

    private MediaPlayer mediaPlayer;
    private AudioManager audioManager;

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

        mediaPlayer = new MediaPlayer();
        audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);

        Button playButton = findViewById(R.id.play_button);
        Button stopButton = findViewById(R.id.stop_button);

        playButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                playAudio();
            }
        });

        stopButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                stopAudio();
            }
        });
    }

    private void playAudio() {
        try {
            mediaPlayer.setDataSource("audio_source_1.mp3"); // 设置第一个音频源
            mediaPlayer.prepare();
            mediaPlayer.start();
            audioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void stopAudio() {
        if (mediaPlayer.isPlaying()) {
            mediaPlayer.stop();
            mediaPlayer.reset();
            audioManager.abandonAudioFocus(this);
        }
    }

    @Override
    public void onAudioFocusChange(int focusChange) {
        switch (focusChange) {
            case AudioManager.AUDIOFOCUS_GAIN:
                // 获得音频焦点，可以继续播放音频
                mediaPlayer.start();
                break;
            case AudioManager.AUDIOFOCUS_LOSS:
                // 失去音频焦点，停止播放音频
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.stop();
                    mediaPlayer.reset();
                }
                audioManager.abandonAudioFocus(this);
                break;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mediaPlayer.release();
    }
}