java在再次播放之前停止MediaPlayer不起作用

Question

我有一个包含一些项目的列表视图，每个项目都会播放特定的声音。以下是代码：

listView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
            try {
                player.setDataSource(externalStoragePath + "/Android/data/com.whizzappseasyvoicenotepad/" + recordedFilesArray.get(arg2) + ".mp3");
                player.prepare();
                player.start();
            } catch (IllegalArgumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SecurityException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    });

如果我单击一个项目，它开始播放，然后在我之前单击的项目结束播放之前单击另一个项目，MediaPlayer将同时播放两种声音。如果我在MediaPlayer停止播放之前单击了该项目，如何让它停止播放前一个声音并开始播放新的声音

我试着添加播放器。在尝试之前停止（），这样每次我单击一个项目时，MediaPlayer都会在设置新源并重新开始之前停止，但这只会停止上一个声音，而不会播放新的声音

我还尝试添加IF语句，如下所示：

if (!player.isPlaying()){
//normally start the player
}
else if (player.isPlaying()){
//stop it before starting it again
}

我会复制我的实际代码，但我已经删除了，因为它不起作用。它也只是停止了前一个声音，没有播放新的声音

Answer 1

 listView.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
        long arg3) {
        try {
            stopPlaying();
            initializeMediaPlayer(externalStoragePath + "/Android/data/com.whizzappseasyvoicenotepad/" + recordedFilesArray.get(arg2) + ".mp3");
            startPlaying();

        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
});



private void stopPlaying() {
    if (player!=null && player.isPlaying()) {
        player.stop();
        player.release();
    }
}

private void initializeMediaPlayer(String path) {
    player = new MediaPlayer();
    try {
        player.setDataSource(path);
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

private void startPlaying() {
    try {
        player.prepareAsync();
        player.setOnPreparedListener(new OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            if(player!=null)
            player.start();
            }
        });
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 2

停止歌曲后重置播放器

  listView.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
        long arg3) {
        try {
             if (player!=null && player.isPlaying())
              {                     
               player.stop();
               player.reset();
              }

            player.setDataSource(externalStoragePath +     "/Android/data/com.whizzappseasyvoicenotepad/" + recordedFilesArray.get(arg2) + ".mp3");
            player.prepare();
            player.start();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
});

Answer 3

必须在空闲状态下调用setDataSource()。所以你必须在调用setDateSource()之前调用reset()

listView.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
        long arg3) {
        try {
            player.reset();
            player.setDataSource(externalStoragePath + "/Android/data/com.whizzappseasyvoicenotepad/" + recordedFilesArray.get(arg2) + ".mp3");
            player.prepare();
            player.start();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
});

Answer 4

要重用MediaPlayer，必须在设置新dataSource之前调用reset()。还有一件事，你不应该在UI线程中调用prepare()，这可能会导致ANR错误。您宁愿调用prepareAsync()函数