In this post, we will learn about Android Button widget. We will also see different attributes that are used to customise this widget.

Output

Android Button Tutorial Output

Video Output

Getting Started

Android Button can be defined as below –

Android Button is user interface that user can tap or click to perform some action.

Different Attributes Of Android Button Widget

Different attributes that are used in button are list below. However, if you want to see the complete list of attributes, you need to visit android official documentation on Button widget. Here, we are listing commonly used attributes.

Attributes in Button are inherited from TextView and View. Some of the popular attributes are –

Example Of Android Button Widget

In this section, we will learn how to use android Button widget in any android application. At first, we will create android application. Then, we will use Button widget in the application.

Follow the steps below to create new android project. Please ignore the steps if you have already created the project.

1. Creating New Project

Since we have a project now. We will modify the xml and java file to use Button widget. Please follow the steps below.

2. Modify Values Folder

Open res/values/strings.xml file. Then, add below code into it.

<resources>
	<string name="app_name">Button</string>
	<string name="show_message">Show message</string>
	<string name="welcome_message">Welcome to Button Tutorial!</string>
</resources>

Other values folder have not been changed. So, we are not going to mention it here.

3. Use Button Widget in xml file

Open res/layout/activity_main.xml file. Add below code into it. You may also visit post to use Button widget programmatically in android

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	android:id="@+id/activity_main"
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:gravity="center"
	android:orientation="vertical">

	<Button
		android:id="@+id/btnShow"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/show_message">
	</Button>

</LinearLayout>

Here, we have defined android Button widget in xml file. Now, we will access this Button in java file. Then, we will show Toast message on button click.

4. Access Button in java file

Open src/main/java/com.tutorialwing.edittext/MainActivity.java file. Then, add below code into it.

package com.tutorialwing.button;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

		Button btnShow = findViewById(R.id.btnShow);
		if (btnShow != null) {
			btnShow.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View v) {
					Toast.makeText(MainActivity.this, R.string.welcome_message, Toast.LENGTH_LONG).show();
				}
			});
		}
	}
}

Since AndroidManifest file is important part of any android application. we are also going to see the content inside this file.

AndroidManifest.xml file

Code inside main/AndroidManifest.xml file is as below.

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.button"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<application
		android:allowBackup="true"
		android:icon="@mipmap/ic_launcher"
		android:label="@string/app_name"
		android:roundIcon="@mipmap/ic_launcher_round"
		android:supportsRtl="true"
		android:theme="@style/AppTheme">
		<activity android:name=".MainActivity">
			<intent-filter>
				<action android:name="android.intent.action.MAIN"/>

				<category android:name="android.intent.category.LAUNCHER"/>
			</intent-filter>
		</activity>
	</application>

</manifest>

Now, when we run the application, we will get output as shown above.

That’s end of tutorial on Android Button tutorial and it’s example.