ListView和Adapter Crash問題的分析和解決

發現情況

正在做一個設備控制app,需要阻塞接受下位機發送的can數據，當數據發送過快，10ms一次的時候，app crash 報錯：

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.

原因查找

根據報錯信息找到報錯位置：

protected void layoutChildren() {
    *****************************************

    else if (mItemCount != mAdapter.getCount()) {
                throw new 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(" + getId() + ", " + getClass() 
                        + ") with Adapter(" + mAdapter.getClass() + ")]");
            }
    *****************************************

根據代碼發現 mItemCount != mAdapter.getCount()

分析

原因是由於我在子線程中更新數據，在主線程中更新ui。
比如你在handler處理同步主線程中 爲mItemCount，而這時候子線程add(data),mAdapter.getCount()就加1。
這時候mItemCount != mAdapter.getCount();

解決

把數據更新的操作也放到主線程中。
這樣的話即使1ms發一次數據 app 也不會crash。