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Android Build an Interactive Story App (Retired) User Input Finding Views by IDs

ibrahim dirir
ibrahim dirir
11,290 Points
Posted by ibrahim dirir
ibrahim dirir
11,290 Points

challenge Task 1 of 1

task 1 of 1

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

public class MainActivity extends Activity {

    protected Button mExterminateButton;

    @Override
    public void onCreate(Bundle savedInstanceState) {
      mExterminateButton exterminate =  new mExterminateButton
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Declare our view variables

    }

}

1 Answer

Alex Johnson
Alex Johnson
6,067 Points
Alex Johnson
Alex Johnson
6,067 Points

As the challenge says, the mExterminateButton has already been declared, you just need to initialize it. There are a few parts to this. First, you need to use the method findViewById() and pass in the ID they give you in the prompt (button1). But you can't just use button1, you have to say where it is (by using R.id.). Finally, you need to cast the object that's returned as a Button, since that's what mExterminateButton is expecting.

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

public class MainActivity extends Activity {

    // Button declared
    protected Button mExterminateButton;

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

        // Initialize mExterminateButton by finding view by ID and cast as a Button
        mExterminateButton = (Button) findViewById(R.id.button1);
    }
}