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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
68,987 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()??