为什么COMMIT在执行立即后解决了问题？(Why COMMIT resolved the issue after execute immediate?)

 我听说RunOnUiThread方法将一个runnable （ RunOnUiThread的{}块）发布到UI线程的handler 。 然后UI线程将在不忙时执行runnable.run()方法。 如你所知，UI 必须有一段时间让我们不忙，因为如果没有，它会导致系统显示ANR（应用程序没有响应）消息（甚至当UI线程尝试运行耗时时它会抛出Exception （滞后）工作，如网络:)）。 
 
 ** edit **这是一个java代码，向您展示runOnUiThread工作原理。 引自此博客（韩文） 
 
@Override
public final void runOnUiThread(Runnable action)
{
    if (Thread.currentThread() !=mUiThread)
    {
        mHandler.post(action);
    }
    else
    {
        action.run();
    }
}
 
 PS我不是kotlin的出口，但我希望我的回答对你有帮助。 抱歉我的英语不好。 

I heard that RunOnUiThread method posts a runnable( the {} block in kotlin) to the handler of the UI thread. Then the UI thread will execute the runnable.run() method when it is not busy. As you know there must be a time when the UI thread us not busy, because it will cause the system to show ANR(applicafion not responding) message if not (And even it throwsExceptions when the UI thread tries to run time-consuming(lagging) jobs like networking :)). 
 
**edit ** Here's a java code that shows you how runOnUiThread works. Cited from this blog (Korean)
 
@Override
public final void runOnUiThread(Runnable action)
{
    if (Thread.currentThread() !=mUiThread)
    {
        mHandler.post(action);
    }
    else
    {
        action.run();
    }
}
 
P.S. I am not an export in kotlin, but I hope my answer helped you.