Android: Implementing OnClickListener on a button

Main Activity

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class ButtonActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_button);

        Button clickme=(Button) findViewById(R.id.b);

        clickme.setOnClickListener(new OnClickListener(){

            @Override

            public void onClick(View arg0) {

                Toast.makeText(getApplicationContext(), "You clicked me",Toast.LENGTH_LONG).show();

               

            }

           

        });

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.button, menu);

        return true;

    }

}

Activity_button 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

   

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".ButtonActivity" >

    <Button

        android:id="@+id/b"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_alignParentLeft="true"

        android:layout_alignParentRight="true"

        android:text="Click me" />

</RelativeLayout>

 

Run the program

 After clicking the button the toast appears