Android webview

I need someone to make a code that using webview to able select dropbox chooser. See: [login to view URL] Then click on the chooser button, will pop up new window to select file. There's a 'cancel' and 'choose' button. I have problem that nothing happened when click them on android webview. However with android web app it works, so something must be missing. Please reply with "dropbox", and please send working apk file. if tested works, i'll pay for the code. thanks