Question

因此,我有一个简单的机体类型申请,通过一份名单来操作。标注一个物品,它具有声望。我有一个公开的静态内涵,名称是健全的ResourceList,其条目包括R.raw.foo, R.raw。在《清单》中与案文有关的条目的顺序相同。

该守则为包括我本人在内的许多用户服务,但最近张贴了Null PointerException,特别是从“CompletionListener”线上张贴。对我来说,这意味着媒体主持人。造成返回无效,但我无法说明为什么会失败,而并非每个人都会失败。

public void onListItemClick(ListView parent, View v, int position, long id) {
    MediaPlayer mp = MediaPlayer.create(getBaseContext(), soundResourceList[position]);
    mp.setOnCompletionListener(new OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {
            mp.release();
        }
    });
    mp.setOnPreparedListener(new OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            mp.start();
        }
    });
}

Normally a NPE with MediaPlayer is due to something like not releasing its previous instance, but I already have that issue handled as shown in the code. So what am I missing that might cause the MediaPlayer.create() to fail?

Answer 1

http://developer.android.com/vis/android/media/MediaPlayer.html#create”rel=“nofollow”>create 方法:

Returns
    a MediaPlayer object, or null if creation failed

由于可能为每个媒体Player分配一些低水平资源,如果总经理忙忙忙忙忙忙忙忙忙忙忙忙,则媒体分配会失败。

如果这些声音都是相对活跃的传闻,那么你可以查看android.media.SoundPool/a>。

友情链接