Get activity theme from network and apply it programmatically

I want to download themes.xml from network because i开发者_如何学Go need dinamically change application theme. So after application starts, download file themes.xml from network, saves it locally and apply to current activity.

How i can do this?

Thank you.

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in oncreate functions, get the value from network and do like this:

if (valueRecievedFromNetwork == "Dialog")
    this.setTheme(android.R.style.Theme_Dialog);
else if.......