播放完成后如何释放我的媒体播放器？

Question

我正在创建一个音板，单击大约 30 种不同的声音后它停止工作；我相信android内存不足。下面是我的代码。如何实现 .release() 以便在播放完声音后释放它？我真的不在乎两件事是否同时播放。为了实现这一点，剪辑太短了。我只想得到我的代码集。

public class soundPageOne extends Activity {
    public void onCreate(Bundle savedState) {
        super.onCreate(savedState);
        setContentView(R.layout.soundsone);

        final MediaPlayer pg1 = MediaPlayer.create(this, R.raw.peter1);
        Button playSound1 = (Button) this.findViewById(R.id.peter1Button);

        playSound1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                pg1.start();

        }
    });

我已经做了很多搜索，但由于我缺乏 java/android 知识，我无法得到任何工作。在此先感谢，如果有人需要更多代码，请告诉我。

Answer 1

我发表了评论，但无论如何我都会发布一个答案来说明我的意思......

这个想法是您可以使用一定数量的MediaPlayer 实例。这样，您永远不会超过最大实例数。该数组应该是您希望能够听到的并发声音数量的长度。如果声音是本地文件，则准备声音所需的时间几乎可以忽略不计，因此在点击处理程序中调用create 不会导致糟糕的性能。我想你的每个按钮都与一个特定的资源相关联，所以我设置了一个辅助方法来以相同的方式为每个按钮创建和播放声音。

public class soundPageOne extends Activity {

    private MediaPlayer[] mPlayers = new MediaPlayer[2];
    private int mNextPlayer = 0;

    @Override
    public void onCreate(Bundle savedState) {
        super.onCreate(savedState);
        setContentView(R.layout.soundsone);
        Button playSound1 = (Button)this.findViewById(R.id.peter1Button);
        playSound1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startSound(R.raw.peter1);
            }
        });
    }

    public void onDestroy() {
        super.onDestroy(); // <---------------------- This needed to be there
        for (int i = 0; i < mPlayers.length; ++i)
            if (mPlayers[i] != null)
                try {
                    mPlayers[i].release();
                    mPlayers[i] = null;
                }
                catch (Exception ex) {
                    // handle...
                }
    }

    private void startSound(int id) {
        try {
            if (mPlayers[mNextPlayer] != null) {
                mPlayers[mNextPlayer].release();
                mPlayers[mNextPlayer] = null;
            }
            mPlayers[mNextPlayer] = MediaPlayer.create(this, id);
            mPlayers[mNextPlayer].start();
        }
        catch (Exception ex) {
            // handle
        }
        finally {
            ++mNextPlayer;
            mNextPlayer %= mPlayers.length;
        }
    }

}

Answer 2

创建一个类，比如AudioPlayer 和SoundPool 变量。设置一个构造函数来初始化AudioPlayer 对象并创建一个Play 方法。 SoundPool 更适合播放多次的短声音，并且不需要您释放。

public class AudioPlayer {

    private SoundPool sPool = new SoundPool(Integer.MAX_VALUE, AudioManager.STREAM_MUSIC, 0);

    public AudioPlayer(Context c, int id){  
        sounds.put("1",sPool.load(c, id, 1));   
    }

    public void play(Context c) {
        sPool.play("1", 1, 1, 1, 0, 1f);
    }
}

所以你的班级应该是这样的

public class soundPageOne extends Activity {
public void onCreate(Bundle savedState) {
    super.onCreate(savedState);
    setContentView(R.layout.soundsone);

    final AudioPlayer ap = new AudioPlayer(this, R.raw.sound);
    Button playSound1 = (Button) this.findViewById(R.id.peter1Button);

    playSound1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            ap.play();

    }
});

Answer 3

你能用MediaPlayer.OnCompletionListener吗？

类似：

public class soundPageOne extends Activity implements MediaPlayer.OnCompletionListener {
    public void onCreate(Bundle savedState) {
        super.onCreate(savedState);
        setContentView(R.layout.soundsone);
        final MediaPlayer pg1 = MediaPlayer.create(this, R.raw.peter1);

        //***set the listener here***
        pg1.setOnCompletionListener(this);

        Button playSound1 = (Button) this.findViewById(R.id.peter1Button);

        playSound1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                pg1.start();
            }   
        });
    }

    //***this code will be executed once the sound finishes playing***
    @Override
    public void onCompletion(MediaPlayer mp) {
        //log messages, other things can go here
        mp.release();
    }

Answer 4

试试这样的

您的活动课程：

public class soundPageOne extends Activity {
public void onCreate(Bundle savedState) {
    super.onCreate(savedState);
    setContentView(R.layout.soundsone);

    final AudioPlayer pg1 = new AudioPlayer();
    Button playSound1 = (Button) this.findViewById(R.id.peter1Button);

    playSound1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            pg1.play(this, R.raw.sound);

    }
});

}

这是另一个 Java 类：

public class AudioPlayer {

private MediaPlayer mPlayer;

public void stop() {
    if (mPlayer != null) {
        mPlayer.release();
        mPlayer = null;
    }
}

public void play(Context c, int sound) {

    stop();

    mPlayer = MediaPlayer.create(c, sound);

    mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        public void onCompletion(MediaPlayer mp) {
            stop();
        }
    });

    mPlayer.start();
}

public boolean isPlaying() {
    return mPlayer != null;
}

}