Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
anirudh erabelly
Courses Plus Student 1,122 PointssetOnClickListener() , View.onClickListener() , View datatype.
What does setOnClickListener() , View.onClickListener() mean?? explain me briefly what does "View" datatype really mean in java programming?? why do we write LaunchActivity extends Activity??
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class LaunchActivity extends Activity {
public Button mLaunchButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_launch);
mLaunchButton = (Button)findViewById(R.id.launchButton);
mLaunchButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Add your code in here!
Intent
}
});
}
}
1 Answer
obsaabawaji
69,690 PointsViews are specific to android development and are just Objects. View is the super class(or Parent class) that all other child class views( like Button, TextView, ImageView) inherit from. Having a View class and its child classes also allows you to interact with your UI inside of your java code. LaunchActivity extends Activity is an example of setting up that inheritance. What you are telling your compiler in that line is that you want all the functionality that Activity has to be available to LaunchActivity.
anirudh erabelly
Courses Plus Student 1,122 Pointsanirudh erabelly
Courses Plus Student 1,122 Pointswhat about setOnClickListener()??