Android Question Different behaviors between mobiles ?

Dont put a try/catch everywhere. That will just cause the code to fail silently and impossible to debug.
How did the string get an exclamation mark and what makes you think it was device dependent?
I've had weird characters in my requests but they were down to user issues.

Hello,

Thanks a lot for your reply. That's super kind of you.

How did the string get an exclamation mark

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It was the user input in an EditText.
The content is put into a string, urlencoded and sent to a server which urldecodes it, stores it in a text file and replies "OK".
That's basic.

what makes you think it was device dependent?

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Because when I was prototyping, I never got the same issue. I had made tests with a lot of phones.

And in fact, my client told me that the code worked on 22 phones but not on the 23th...

I've had weird characters in my requests but they were down to user issues.

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I can understand that. That's the reason why, we developers, do a lot of testing, try to secure the user's inputs, etc. That's OK for me but what makes me very uncomfortable is not being able to understand why on some models the app could not work even if the Android's version is about the same...

Thats weird, because an exclamation mark is a valid charachter (it doesnt get urlencoded).
I've really stopped caring about obscure device issues, if someone has such a device then they are probably aware that half the things wont work on it.