How to handle button click event using XML code

In this tutorial how to handle button click event using XML code is shown.

Code:

activity_main.xml

<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=”.MainActivity” >

<TextView
android:id=”@+id/tv1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_alignParentTop=”true”
android:layout_centerHorizontal=”true”
android:layout_marginTop=”111dp” />

<Button
android:id=”@+id/b1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_below=”@+id/textView1″
android:layout_centerHorizontal=”true”
android:layout_marginTop=”48dp”
android:text=”Click Here”
android:onClick=”showmes” />

</RelativeLayout>

MainActivity.java

package com.example.demo;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity {

TextView tv1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1=(TextView)findViewById(R.id.tv1);
}

public void showmes(View v)
{
tv1.setText(“Hello Friends!”);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

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