Question

我知道，当它抛出IllegalStateException时，直截了当。但就我而言，我不能猜测，源头的麻烦在哪里。我敢说，麻烦就行了：

private class LoadMoreDataTask extends AsyncTask<Void, Void, Void> {
    @Override
    protected Void doInBackground(Void... params) {
        if (isCancelled()) {
            return null;
        }
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
        }
        OFFSET = OFFSET + COUNT;
        getWallsData();
        return null;
    }
    @Override
    protected void onPostExecute(Void result) { 

        mPostListAdapter.notifyDataSetChanged();                
        wallPostsList.onLoadMoreComplete();
        super.onPostExecute(result);
    }
    @Override
    protected void onCancelled() {
        wallPostsList.onLoadMoreComplete();
    }

有一条logcat消息：

java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131099757, class com.costum.android.widget.LoadMoreListView) with Adapter(class android.widget.HeaderViewListAdapter)]

Answer 1

问题得到解决：答案被发现 there ！我做了什么？我添加了切换器，布尔LOADMORE SWITCHER = false;作为全局可见性并替换为mPostListAdapter.notifyDataSetChanged（）;从doInBackground（）到getWallsData（）。

private Boolean LOADMORE SWITCHER=false;
....
private class LoadMoreDataTask extends AsyncTask<Void, Void, Void> {
    @Override
    protected Void doInBackground(Void... params) {
        if (isCancelled()) {
            return null;
        }
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
        }
        OFFSET = OFFSET + COUNT;
        LOADMORE=true;
        getWallsData();
        return null;
    }
    @Override
    protected void onPostExecute(Void result) { 

       // mPostListAdapter.notifyDataSetChanged(); was replaced to getWallsData() body
        wallPostsList.onLoadMoreComplete();
        super.onPostExecute(result);
    }
    @Override
    protected void onCancelled() {
        wallPostsList.onLoadMoreComplete();
    } 
}
.....
getWallsData(){
     ...
     if(LOADMORE){
          mPostListAdapter.notifyDataSetChanged();
          LOADMORE=false;


     }
}

我非常高兴地说：我不再有这个问题：

java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131099757, class com.costum.android.widget.LoadMoreListView) with Adapter(class android.widget.HeaderViewListAdapter)]

IllegalStateException：适配器的内容已更改，但ListView未收到通知

1 个答案: