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Android Build a Simple Android App (2014) Basic Android Programming Accessing Views in Code

Posted by Edu Pucheta
Edu Pucheta
286 Points

My code is in read,and i don´t know why.

public class FunFactsActivity extends Activity {

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

        //Declare our view variables and assign the Views from the layout file

        final TextView factLabel= (TextView) findViewById(R.id.factTextView);
        Button showFactButton = (Button) findViewById(R.id.showFactButton) ;
        View.OnClickListener listener = new View.OnClickListener() {
            @Override
            public void onClick(View view) {
// the button was clicked so a new fact is displayed
                String fact = "Ostrages can run faster than horses" ;
                factLabel.setText(fact);
            };
        };
        showFactButton.setOnClickListener(listener);

    }

The second time that says showFactButton is in red. :(

2 Answers

Daniel Hartin
Daniel Hartin
18,106 Points
Daniel Hartin
Daniel Hartin
18,106 Points

Hi Edu

Not entirely sure I know what you mean, however from looking at the code you've posted the second showFactButton is here in the line findViewById(R.id.showFactButton);

If this showFactButton is underlined in red it is highly likely your XML file has a different id set for the Button element and may just be a simple typo error.

Go into your XML layout file and look for the line

android:id="@+id/showFactButton"

Please bear in mind the line that declared the id must be spelt exactly the same as it is in your java code.

Hope this helps, but if it doesn't solve it or your having problems just paste your XML code back here

Daniel

Edu Pucheta
Edu Pucheta
286 Points
Edu Pucheta
Edu Pucheta
286 Points

Thanks you! Really accurate and quick reply!

I think i solved that problem. Now, i do not know what happens. The button just does not work.

public class FunFactsActivity extends Activity {

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

    //Declare our view variables and assign the Views from the layout file
    final TextView factLabel= (TextView) findViewById(R.id.factTextView);
    Button showFactButton = (Button) findViewById(R.id.showFactButton) ;
    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // the button was clicked so a new fact is displayed
            String fact = "Ostriches can run faster than horses.";
            factLabel.setText(fact);
        }
    };
    showFactButton.setOnClickListener(listener);

}