In this tutorial how to handle button click event using Java code or using button onclick listener method is shown.<\/p>\n
Code:<\/p>\n
activity_main.xml<\/p>\n
<RelativeLayout xmlns:android=”http:\/\/schemas.android.com\/apk\/res\/android”
\nxmlns:tools=”http:\/\/schemas.android.com\/tools”
\nandroid:layout_width=”match_parent”
\nandroid:layout_height=”match_parent”
\nandroid:paddingBottom=”@dimen\/activity_vertical_margin”
\nandroid:paddingLeft=”@dimen\/activity_horizontal_margin”
\nandroid:paddingRight=”@dimen\/activity_horizontal_margin”
\nandroid:paddingTop=”@dimen\/activity_vertical_margin”
\ntools:context=”.MainActivity” ><\/p>\n
<TextView
\nandroid:id=”@+id\/tv1″
\nandroid:layout_width=”wrap_content”
\nandroid:layout_height=”wrap_content”
\nandroid:layout_alignParentTop=”true”
\nandroid:layout_centerHorizontal=”true”
\nandroid:layout_marginTop=”90dp” \/><\/p>\n
<Button
\nandroid:id=”@+id\/b1″
\nandroid:layout_width=”wrap_content”
\nandroid:layout_height=”wrap_content”
\nandroid:layout_below=”@+id\/tv1″
\nandroid:layout_centerHorizontal=”true”
\nandroid:layout_marginTop=”46dp”
\nandroid:text=”Click Here” \/><\/p>\n
<\/RelativeLayout><\/p>\n
MainActivity.java<\/p>\n
package com.example.demo;<\/p>\n
import android.os.Bundle;
\nimport android.app.Activity;
\nimport android.view.Menu;
\nimport android.view.View;
\nimport android.widget.Button;
\nimport android.widget.TextView;
\npublic class MainActivity extends Activity {
\nTextView tv1;
\nButton b1;<\/p>\n
@Override
\nprotected void onCreate(Bundle savedInstanceState) {
\nsuper.onCreate(savedInstanceState);
\nsetContentView(R.layout.activity_main);
\ntv1=(TextView)findViewById(R.id.tv1);
\nb1=(Button)findViewById(R.id.b1);<\/p>\n
b1.setOnClickListener(new View.OnClickListener() {<\/p>\n
@Override
\npublic void onClick(View arg0) {
\n\/\/ TODO Auto-generated method stub
\ntv1.setText(“Hello Friends!”);
\n}
\n});
\n}
\n@Override
\npublic boolean onCreateOptionsMenu(Menu menu) {
\n\/\/ Inflate the menu; this adds items to the action bar if it is present.
\ngetMenuInflater().inflate(R.menu.main, menu);
\nreturn true;
\n}<\/p>\n
}<\/p>\n