小编San*_*rle的帖子

我有一个像这样的音频文件列表,

int music_numbers[] = { R.raw.one, R.raw.two, R.raw.three, R.raw.four,
            R.raw.five, R.raw.six, R.raw.seven, R.raw.eight, R.raw.nine };

我需要逐个玩这个 - 当我向这个play_numbers方法发送100时 - 我打算打数字...

我做到了这一点 - 但我无法一个接一个地做到这一点......

private void _play_numbers(final String i) {
    // TODO Auto-generated method stub

    mPlayer = MediaPlayer.create(PlayFileActivity.this, R.raw.payment);
    mPlayer.start();

    mPlayer.setOnCompletionListener(new OnCompletionListener() {

        @Override
        public void onCompletion(MediaPlayer mp) {
            // TODO Auto-generated method stub
            mPlayer.stop();
            myDigit = i.charAt(1) + "";

            _function_play_file(Integer.parseInt(myDigit));

        }

    });

}

在_function_play_file中 - 我有这个

void _function_play_file(int files) {

        switch (files) {
        case 0:
            mPlayer = MediaPlayer.create(this, music_numbers[0]);
            mPlayer.start(); …

我在这里看到一个奇怪的错误..我有一个列表视图,它是从异步中的服务器填充...它首先填充然后显示列表视图...但是当我向下滚动它崩溃...从日志我看到它与列表视图的人口无关... ...你能帮我吗？

04-12 12:39:54.676: E/AndroidRuntime(1984): FATAL EXCEPTION: main
04-12 12:39:54.676: E/AndroidRuntime(1984): java.lang.NullPointerException
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.widget.AbsListView.obtainView(AbsListView.java:1304)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.widget.ListView.makeAndAddView(ListView.java:1727)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.widget.ListView.fillUp(ListView.java:682)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.widget.ListView.correctTooHigh(ListView.java:1349)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.widget.ListView.fillGap(ListView.java:624)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.widget.AbsListView.trackMotionScroll(AbsListView.java:2944)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.widget.AbsListView.onTouchEvent(AbsListView.java:2065)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.widget.ListView.onTouchEvent(ListView.java:3315)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.view.View.dispatchTouchEvent(View.java:3766)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:897)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
04-12 12:39:54.676: E/AndroidRuntime(1984):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
04-12 12:39:54.676: E/AndroidRuntime(1984): …