Android beginner onClick crash

Question

I\'m programming Android for the first time and I\'m having some difficulties. The idea is to make a guessing game app in which the user takes a number in his/her head and the a

Answer 1

1. where does my reasoning fail?

You are using the wrong setText() method. In the TextView Docs you will see that there is one which takes an int, this is for retrieving a String resource that you have in your strings.xml so you would pass it a resource id. So your setText() is looking for a resource with the id of whatever your answer variable is. You will want to convert this to a String with something like

buttonTextView.setText(String.valueof(answer));

or one of several different ways.

2. How can I debug things like this?

When your app crashes there will be an exception in your logcat. This answer can help you to read your logcat. To open your logcat window in Eclipse, if it isn't already, you can do this

Window --> Show View --> Other --> Android --> LogCat

A couple side notes

You should change your params like in onClick() to something meaningful so I would change

public void onClick(View arg0)

to something like

public void onClick(View v)  // v for view, could also be view, btn
                       //  whatever makes sense to you and others who may read it

You also should compare the id of your View clicked instead of the View itself. So you would compare it with something like the following (assuming you changed arg0 to v)

if (v.getId() == R.id.start)  // Assuming start is the id in your xml of your Button
                                 // this will also allow you to use a switch statement

Your variables in onClick() (min, max, and answer) should be initialized outside of onClick() or they will be reset to the default values with each click which I'm pretty sure you don't want (thanks to 323go for pointing that out).