java - 如何播放、停止和暂停在 android 中的媒体播放器实例上工作？

Question

我想开发媒体播放器类型的应用程序，它有两个按钮，一个用于播放和暂停，一个用于停止。我在我的布局文件中使用了两个图像按钮，并在 Java 文件和我放在这里的代码中引用了它，但是当我点击停止按钮时，音频停止了，但我想重播音频文件；但我不能玩播放按钮。

下面是我的 Java 代码

public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.activity_aarti_fragment, container, false);

        btnplay=(ImageButton)v.findViewById(R.id.btnplay);
        btnstop=(ImageButton)v.findViewById(R.id.btnstop);
        seekbar=(SeekBar)v.findViewById(R.id.seekbar);

        mp = MediaPlayer.create(getActivity(), R.raw.arti);
        btnstop.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                mp.stop();
                btnplay.setImageResource(R.drawable.ic_action_play);
                Toast.makeText(getActivity(), "Stop",Toast.LENGTH_LONG).show();

            }
        });
        btnplay.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                if(mp.isPlaying())
                {
                    mp.pause();
                    btnplay.setImageResource(R.drawable.ic_action_play);
                    Toast.makeText(getActivity(), "Pause",Toast.LENGTH_SHORT).show();
                }
                else
                {   btnplay.setImageResource(R.drawable.ic_action_pause);
                    mp.start();
                    Toast.makeText(getActivity(), "Play",Toast.LENGTH_SHORT).show();
                }
            }
        });

        return v;
    }

Answer 1

使用这个:

private BackgroundSound mBackgroundSound;
private MediaPlayer player;
public class BackgroundSound extends AsyncTask<Void, Void, Void> {
    @Override
    protected Void doInBackground(Void... params) {
        player = MediaPlayer.create(HomePage.this, R.raw.background);
        AudioManager audioManager = (AudioManager)  getSystemService(AUDIO_SERVICE);
        float actualVolume = (float) audioManager
                .getStreamVolume(AudioManager.STREAM_MUSIC);
        float maxVolume = (float) audioManager
                .getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        float volume = actualVolume / maxVolume;
        player.setLooping(true); // Set looping
        player.setVolume(volume, volume);
        player.start();
        return null;
    }
}

播放:

        mBackgroundSound = new BackgroundSound();
        mBackgroundSound.execute();

停止:

        mBackgroundSound.cancel(true);
        if (player != null) {
             player.stop();
             player.release();
        }

暂停:

        if (player != null) {
             player.pause();
        }