Exit an Android app -

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I have an Android app where I check user credentials in the first screen from the remote server. I have 10 seconds of timeout after the timeout app sends the user to the error page. There I have an exit button

I 

  android Os.Process.killProcess (android.os.Process.myPid ()) has tried to erase all logic to exit the app;   
 In the click of the Exit Button I can not extract from the application.  
 Please help me find a way out of the app.   
 
 
 Why users just want to exit the app, because the user entered the wrong identity card or correct Not Credential?  
 If I were you, seeing error / activity / "page" which will provide a creative solution to the problem there is no use in the user simply by saying "error" and the exit from the app.  
 For your query, Google discourages the implementation of the removal button. Android will "get out" of your app when it looks fit and when it comes to the developer to implement the right behavior Depends.

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