Working with Button

activity_main.xml:

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

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

    android:id="@+id/LinearLayout1"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context=".MainActivity" >

    

    <Button 

        android:id="@+id/clickButton"

        android:layout_height="wrap_content"

        android:layout_width="wrap_content"

        android:text="Click Me"

        android:layout_gravity="center"

        android:layout_marginTop="50dp"

        android:textSize="20dp"

        />

    

</LinearLayout>

MainActivity.java:

package com.ram.workingwithbutton;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);


Button clickBtn = (Button)findViewById(R.id.clickButton);

clickBtn.setOnClickListener(this);
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "button is working", Toast.LENGTH_LONG).show();
}



}