Android Button Example

In Android, just use “android.widget.Button” class to display a normal button.

A button consists of text or an icon (or both text and an icon) that communicates what action occurs when the user touches it.

Depending on whether you want a button with text, an icon, or both, you can create the button in your layout in three ways:

1.With text, using the Button class:

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/button_text"

/>

2.With an icon, using the ImageButton class:

<ImageButton

android:id="@+id/btnDisplay"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/button_icon"

/>

3.With text and an icon, using the Button class with the android:drawableLeft attribute:

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/button_text"

android:drawableLeft="@drawable/button_icon"

/>

In this tutorial, we show you how to display a normal button, add a click listener, when user click on the button, show the toast message.

1. Add Button

Open “res/layout/main.xml” file, add a button.

File : res/layout/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"

tools:context=".MainActivity" >

<Button

android:id="@+id/btnHello"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_centerVertical="true"

android:text="Hello" />

</RelativeLayout>

2. Code

package com.learnsimply.buttonclick;

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 MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button btnClick = (Button)findViewById(R.id.btnHello);

btnClick.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Toast.makeText(MainActivity.this, "Hello is clicked", 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.activity_main, menu);

return true;

}

}

Download Source Code Android button example.zip