java - 我有一个arraylist，它的大小为1，但是当我到达索引0时，我得到= java.lang.IndexOutOfBoundsException：索引：0，大小：0(I have an arraylist and its size is 1, but when i get at index 0, i get = java.lang.IndexOutOfBoundsException: Index: 0, Size: 0)

Question

@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
    VideoTask videoTask =  new VideoTask(paccakModel, childPosition, video);
    videoTask.execute();

    ArrayList<VideoModelXml> test = videoTask.getVideoModelXmls();
    test.get(0);

   video.setVideoPath(test.get(0).getUrlVideo());
   video.start();
    return true;
}

I have an arraylist and its size is 1, but when i get at index 0, i get = java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 can anybody tell me, what is going on?

(我有一个arraylist，它的大小是1，但是当我到达索引0时，我会得到= java.lang.IndexOutOfBoundsException：索引：0，大小：0谁能告诉我，这是怎么回事？)

  ask by Hamizul Fuad translate from so

Answer 1

The reason for your issue is videoTask.getVideoModelXmls() returns nothing.

(问题的原因是videoTask.getVideoModelXmls()返回任何内容。)

It should be empty.

(它应该是空的。)

If you want to avoid the crash

(如果要避免坠机)

ArrayList<VideoModelXml> test = videoTask.getVideoModelXmls();
if (test .size() > 0){
test.get(0);

   video.setVideoPath(test.get(0).getUrlVideo());
   video.start();
}

Which will avoid your crash.

(这样可以避免崩溃。)