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Android Build a Simple Android App (2014) Basic Android Programming Initializing a Button

Eleni Minadaki
Eleni Minadaki
3,687 Points
Posted by Eleni Minadaki
Eleni Minadaki
3,687 Points

Compiler error on Stage 3,Build a simple android app

Button showFactButton = (Button)findViewById(R.id.showFactButton); Button showFactButton;

Could anyone see where is the problem here? Thanks a lot!

FunFactsActivity.java 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class FunFactsActivity extends Activity {

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

        // Declare our View variables and assign them the Views from the layout file

        Button showFactButton = (Button)findViewById(R.id.showFactButton);
       Button showFactButton;
    }
}

4 Answers

Jasmine Leon
Jasmine Leon
8,098 Points
Jasmine Leon
Jasmine Leon
8,098 Points

It means that you can't declare a variable twice or more in the same scope. You need to either have:

  • Button showFactButton = (Button) findViewById(R.id.showFactButton); or
  • Button showFactButton; in the onCreate method, but not both.

Does that help?

Jasmine Leon
Jasmine Leon
8,098 Points
Jasmine Leon
Jasmine Leon
8,098 Points

You should remove the second declaration of the showFactButton.

Eleni Minadaki
Eleni Minadaki
3,687 Points
Eleni Minadaki
Eleni Minadaki
3,687 Points

Thanks for your reply Jasmine Leon i write this:Button showFactButton = (Button) findViewById(R.id.showFactButton); Button showFactButton; and the error is this! FunFactsActivity.java:16: error: variable showFactButton is already defined in method onCreate(Bundle) Button showFactButton; it look like the error is the showFactButton but can't understand what it means!

Eleni Minadaki
Eleni Minadaki
3,687 Points
Eleni Minadaki
Eleni Minadaki
3,687 Points

Now it is very understandable for me,thank you very much for your help! apreciate!