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Android Build a Simple Android App with Java Basic Android Programming Making a Button Do Something

Michał Juszczuk
Michał Juszczuk
885 Points
Posted by Michał Juszczuk
Michał Juszczuk
885 Points

Why, in my program the proper form of initialising factTextView is R.id.facttextView instead of R.id.factTextView?

I made everything as it was in toutorial, but Android Studio gave me a tip to write : factTextView = findViewById(R.id.facttextView); - It's working.

factTextView = findViewById(R.id.factTextView); - It's how it's made in toutorial, and it's not working in my case.

Why i had to write it differently, even though variable name is "factTextView" (capital T)?

This is the code: //declare our view variables private TextView factTextView; private Button showFactButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fun_facts);

    // Assign Views from the layout file to the corresponding variables

    factTextView = findViewById(R.id.facttextView);
   showFactButton =findViewById(R.id.showFactbutton);

3 Answers

Maciej Czuchnowski
Maciej Czuchnowski
36,441 Points
Maciej Czuchnowski
Maciej Czuchnowski
36,441 Points

You most likely used the name facttextView (lower case t) in your layout. Check your res/layout/activity_main.xml or similar file in that folder.

Michał Juszczuk
Michał Juszczuk
885 Points
Michał Juszczuk
Michał Juszczuk
885 Points

Ok, dzięki za odpowiedź.

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PLUS
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Courses Plus Student 75 Points
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Courses Plus Student 75 Points

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_fun_facts);

     // Assign the Views form the layout file to the corresponding variables
    factTextView = findViewById(R.id.factTextView);
    showFactButton = findViewById(R.id.showFactButton);