Protobuf + java java.lang.IndexOutOfBoundsException:索引0无效,大小为0

Question

if (hashTags!=null && hashTags.size()>0) {
        for (int i = 0; i<hashTags.size();i++){
        getPostsRequestBuilder.setTags(i, hashTags.get(i));                         
        }
    }

现在,hashTags是一个ArrayList<String>并且它不是空的,所以问题不在于此.protobuf中的标签是重复的字符串.所以,如果我删除getPostsRequestBuilder.setTags并且什么也不做 - 程序不会崩溃,所以问题就在于此.它在第一个(0)元素上崩溃

12-22 15:24:25.390: E/AndroidRuntime(6252): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
12-22 15:24:25.390: E/AndroidRuntime(6252):     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
12-22 15:24:25.390: E/AndroidRuntime(6252):     at java.util.ArrayList.set(ArrayList.java:481)
12-22 15:24:25.390: E/AndroidRuntime(6252):     at com.google.protobuf.LazyStringArrayList.set(LazyStringArrayList.java:119)
12-22 15:24:25.390: E/AndroidRuntime(6252):     at com.google.protobuf.LazyStringArrayList.set(LazyStringArrayList.java:1)
12-22 15:24:25.390: E/AndroidRuntime(6252):     at protobuf.shrick.Shrick$GetPostsRequest$Builder.setTags(Shrick.java:20845)
12-22 15:24:25.390: E/AndroidRuntime(6252):     at pro.shrick.asynctasks.SearchRequest.doInBackground(SearchRequest.java:29)
12-22 15:24:25.390: E/AndroidRuntime(6252):     at pro.shrick.asynctasks.SearchRequest.doInBackground(SearchRequest.java:1)

Answer 1

您应该只使用set*方法来覆盖重复字段中当前的值.您的重复字段当前为空,因此没有要覆盖的第0个元素.

使用add*方法向重复字段添加新值:

getPostsRequestBuilder.addTags(hashTags.get(i));