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Android Build a Simple Android App Basic Android Programming Initializing a Button

Posted by bong zi jiang
bong zi jiang
616 Points

help me

after see video i still don get it so confuse for me

can someone answer me where should i start?

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
        TextView factLabel = (TextView) findViewById(R.id.factTextView);
        Button showFactButton;
    }
}
Jeremy Hill
Jeremy Hill
29,567 Points 
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
        TextView factLabel = (TextView) findViewById(R.id.factTextView);
        Button showFactButton = (Button) findViewById(R.id.showFactButton);
    }
}

You have to initialize "showFactButton", it has already been declared. When you initialize a variable you add a value to it; in this case we are adding the findViewById(R.id.showFactButton) to it and casting it to a Button. That is my understanding of it anyway. The code above passed, just look it over to see what I did.

1 Answer

Cindy Lea
PLUS
Cindy Lea
Courses Plus Student 6,497 Points
Cindy Lea
Cindy Lea
Courses Plus Student 6,497 Points

You need to add this:

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