网上搜了很多解决方案都不行。有个看起来还算靠谱的结论：
Issue 53088: Android reloads web page when selecting file
Most likely your device is running low on memory so when you open the file chooser dialog, the browser app is closed. When you close the chooser, the browser is reopened and has no choice but to reopen the page. That's how Android works. I know it's not helpful in your case, but if that's the problem you are seeing, you are unlikely to get a fix as this is core to the whole of Android.
Try and use some task managers to close all other apps and then try thus again and see if it works better and confirms memory is your issue.
真无解吗？
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