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How to handle button click event using Java code or using button onclick listener method

In this tutorial how to handle button click event using Java code or using button onclick listener method 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=”90dp” />

<Button
android:id=”@+id/b1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_below=”@+id/tv1″
android:layout_centerHorizontal=”true”
android:layout_marginTop=”46dp”
android:text=”Click Here” />

</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.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView tv1;
Button b1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1=(TextView)findViewById(R.id.tv1);
b1=(Button)findViewById(R.id.b1);

b1.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
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;
}

}

https://youtu.be/SoixPH4k7co

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