Java Hello World Example and adding button events and features

New Android project, then the default "Next" to complete the creation;

2. Add a button

3. Add the following red code to the SRC Mainactivity.java

Import android.support.v7.app.ActionBarActivity;
Import Android.support.v7.app.ActionBar;
Import android.support.v4.app.Fragment;
Import android.content.Intent;
Import Android.os.Bundle;
Import Android.view.LayoutInflater;
Import Android.view.Menu;
Import Android.view.MenuItem;
Import Android.view.View;
Import Android.view.View.OnClickListener;
Import Android.view.ViewGroup;
Import Android.widget.Button;
Import Android.widget.TextView;
Import Android.widget.Toast;
Import Android.os.Build;

public class Mainactivity extends Actionbaractivity {

Private Button Mbutton;

@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.activity_main);

if (savedinstancestate = = null) {
Getsupportfragmentmanager (). BeginTransaction ()
. Add (R.id.container, New Placeholderfragment ()). commit ();
}

mbutton= (Button) Findviewbyid (r.id.button1);
Mbutton.setonclicklistener (buttononclicklistener);

}

Private Onclicklistener Buttononclicklistener = new Onclicklistener () {
@Override
public void OnClick (View v) {
Toast.maketext (Getapplicationcontext (), "click Button Event",
Toast.length_short). Show ();
}
};

Java Hello World Example and adding button events and features