I also recommend to you to use electrum mobile wallet you can save your bitcoin there and don't forget to save the 12 words phrase seed
Because 12 word seed phrase is your backup to recover your wallet in other wallet or you can recover it in your desktop electrum wallet..
So if your phone was loss you can be still recover your bitcoin that was save in your mobile phone..
And you can  recover it also in other wallet just save your seed phrase in piece of paper or notepad anywhere in your computer..

I use on my phone Mycelium. But I use it only to monitor some wallets, so I can't give 100% steps, only advises on what you should try yourself.
And whatever people tell, you should test it first for yourself anyway.

As you maybe know, in Bitcoin world all that matters is the wallet's private key or keys. HD wallets have a seed based on what they can generate private keys "by a rule", but the principle is the same.
So you need the private keys or the seed to be kept safe. If your phone gets stolen, you'll have to move fast, restore the wallet(s) on another machine from seed/private keys and move out your coins before the thief will do that.

So I said I have Mycellium. This one allows you to backup your data. You can test yourself doing a backup, erase Mycellium data from your phone, uninstall it, then install and restore from backup. See if the wallet address remains unchanged. I really think that they know what they do and you can safely use Mycellium. Make sure that you keep the backup data in a really safe place.

Another option is hardware wallet. If you have a bigger amount of Bitcoin you should consider this option, it's the safest.

My android BTC bitcoin wallet should be the same like my windows wallet 

Hi,

my HTC has rebooted badly (battery issue)

The following reboot acted like a 1st android boot, and all settings were lost, but not files and apps. Anyway i've had to put setting in apps

Bitcoin app wallet was still there, but not the wallet content and history.

When i browse the folder /data/de.schildbach.wallet folder, it's empty. i'm not root in the phone.
I'm not developper, but taken a look @ MODE_PRIVATE in Java, can it be the explanation ? how to recover ?

thanks for your help

There is any reliable website like swappa to buy used phones with Bitcoin?

Turkish forces have clashed with Hay'et Tahrir al-Sham fighters in Idlib province on the Syria-Turkey border, activists and a monitor reported.

The Syrian Observatory for Human Rights, a Britain-based war monitor, said on Sunday that the Turkish troops exchanged fire with the rebel alliance near the village of Kafr Lusin.