The content of the adapter has c

扫描android视频文件，展示列表的时候，突然报了下面的错误

FATAL EXCEPTION: main
Process: com.haijia.demo, PID: 15355
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. Make sure your adapter calls notifyDataSetChanged() when its content changes.

其中错误描述：

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.

的意思大体是，你的adapter的内容变化了，但是你的ListView并不知情。请保证你adapter的数据在主线程中进行更改！

修改办法

private class DeviceAdapter extends BaseAdapter {  
  
    private LayoutInflater inflater;  
    private ArrayList<Device> devices;  
  
    public DeviceAdapter() {  
        inflater = LayoutInflater.from(mContext);  
    }  
  
    @SuppressWarnings("unchecked")  
    public void setDeviceList(ArrayList<Device> list) {  
        if (list != null) {  
            devices = (ArrayList<Device>) list.clone();  
            notifyDataSetChanged();  
        }  
    }  
  
    public void clearDeviceList() {  
        if (devices != null) {  
            devices.clear();  
        }  
        notifyDataSetChanged();  
    }  
  
    @Override  
    public int getCount() {  
        return devices == null ? 0 : devices.size();  
    }  
以下略）  

相对于原来，我做了两项改动：

1.将所有数据“完全”保存在adapter内部，即使有外部数据进入，也会用.clone()重新生成副本，保证了数据完全是由adapter维护的。

2.保证所有setDeviceList()/clearDeviceList()是从主线程里调用的，如何保证是从主线程中调用的呢：

a.调用Activity.runOnUIThread()方法；

b.使用AsyncTask。