ListView和Adapter Crash问题的分析和解决

发现情况

正在做一个设备控制app,需要阻塞接受下位机发送的can数据，当数据发送过快，10ms一次的时候，app crash 报错：

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

根据报错信息找到报错位置：

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() + ")]");            }    *****************************************

根据代码发现 mItemCount != mAdapter.getCount()

分析

原因是由于我在子线程中更新数据，在主线程中更新ui。比如你在handler处理同步主线程中 为mItemCount，而这时候子线程add(data),mAdapter.getCount()就加1。这时候mItemCount != mAdapter.getCount();

解决

把数据更新的操作也放到主线程中。这样的话即使1ms发一次数据 app 也不会crash。