There are several ways of doing this, if you have the original seed that was used to create the wallet. I have to agree with #LoyceV on this one and suggest that you rather buy a new phone with a Andriod OS to restore the wallet, before you f#%%* something up with the other methods and you risk losing all those coins.
I see the Source code for that wallet is OpenSource, so that is a good thing. Url:
https://github.com/bitcoin-wallet/bitcoin-wallet <People would have checked it for some nasty code.>
Remember once your Seed/Private key are out there, then it is considered that it is exploited, so make sure you use a reputable wallet and immediatly transfer those coins to another wallet.