Question

我正在创建一个声卡，点击大约30种不同的声音后它就会停止工作;我相信android的内存不足。以下是我的代码。我怎样才能实现.release（），这样当声音完成播放时它会被释放？如果两件事同时发挥，我真的不在乎;这些剪辑是可能的。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

我发表评论，但我会发一个答案来表明我的意思......

您的想法是，您可以使用一定数量的MediaPlayer个实例。这样你永远不会超过最大实例数。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，那么准备声音所需的时间几乎可以忽略不计，因此在单击处理程序中调用create不会导致可怕的性能。我想，每个按钮都与特定资源相关联，因此我设置了一个帮助方法，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，用AudioPlayer变量说SoundPool。设置构造函数以初始化AudioPlayer对象并创建Play方法。 SoundPool可以更好地播放多次播放的短音，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);
    }
}

所以你的课应该是

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

您可以使用MediaPlayer.OnCompletionListener吗？

类似的东西：

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

尝试这样的事情

您的活动类：

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;
}

}

完成播放后如何释放媒体播放器？

4 个答案: