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We just left off with a lot of code
that was generated by auto complete.

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We use on click listeners
like this a lot in Android.

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So it'll make more and
more sense the more you use it.

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This on click method,

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will run when ever this listener
detects a click on our button.

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Just like opening our app
triggers the onCreate method,

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typing on our button will
trigger this onClick method.

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So anytime we click on our button,

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the code that we write inside
these curly brackets will run.

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Let's add a comment in the onClick
method to describe what we'd like to do.

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The button was clicked,

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so update the fact
TextView with a new fact.

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All right, now we need a new fact.

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On the line below our comment, let's
create a new string variable named fact.

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And let's set it equal to in
quotation marks Ostriches

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can run faster than horses.

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And don't forget the semicolon.

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Now we need to update our text
view to show this new fact.

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Remember when we were editing the layout?

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We can change the text of a text view
by editing it's text property or

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by changing it directly
in the layout's XML file.

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Android also allows us to make
these kinds of changes in code.

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On a new line type factTextView.setText
and then hit Enter to autocomplete.

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Notice that there's a list of
different parameters down here.

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This is because there are different
versions of this set text method.

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Each taken different parameters.

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We want this first one because it
only has one parameter for the text.

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Now the data type here, CharSequence,

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might be a little confusing
since we're using a String.

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But a String is just
a sequence of characters, so

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it shouldn't be too surprising that
all Strings are also CharSequences.

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Kind of like how text views are also
views or how dogs are also animals.

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In Android,

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whenever you see a Charsequence,
you can just pass in a string.

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All right, let's type fact in between the
parenthesis to pass in our fact variable

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and now we are ready for
the moment of truth.

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Let's click on the Run button,
or hit Ctrl + Alt on Mac,

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or Shift + F10 on Windows to run our app.

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Looks good.

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Let's click on the button to test it.

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Did you know that ostriches
can run faster than horses?