Nikos Maravitsas

About Nikos Maravitsas

Nikos has graduated from the Department of Informatics and Telecommunications of The National and Kapodistrian University of Athens. Currently, his main interests are system’s security, parallel systems, artificial intelligence, operating systems, system programming, telecommunications, web applications, human – machine interaction and mobile development.

Android HorizontalScrollView Example

In this example we are going to see how to use HorizontalScrollView in an Android Application. The HorizontalScrollView is like a ScrollView but with horizontal orientation. It is very useful because it is not very usefull to scoll up and down the whole screen of you application. You can use a small portions of the screen as HorizontalScrollView with scrolling items and have the main screen stable most of the time.

For this tutorial, we will use the following tools in a Windows 64-bit platform:

  • JDK 1.7
  • Eclipse 4.2 Juno
  • Android SKD 4.2

1. Create a new Android Project

Open Eclipse IDE and go to File -> New -> Project -> Android -> Android Application Project. You have to specify the Application Name, the Project Name and the Package name in the appropriate text fields and then click Next.

create-new-project-attr

In the next window make sure the “Create activity” option is selected in order to create a new activity for your project, and click Next. This is optional as you can create a new activity after creating the project, but you can do it all in one step.

check-create-new-activity

Select “BlankActivity” and click Next.

create-blanc-activity

You will be asked to specify some information about the new activity.  In the Layout Name text field you have to specify the name of the file that will contain the layout description of your app. In our case the file res/layout/main.xml will be created. Then, click Finish.

new-activity-attr

2. Create the main layout of the Application

Open res/layout/main.xml file :

main-xml

And paste the following code :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <HorizontalScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="50dp" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Button1" />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Button2" />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Button3" />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Button4" />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Button5" />

        </LinearLayout>
    </HorizontalScrollView>

</LinearLayout>

Now you may open the Graphical layout editor to preview the User Interface you created:

graphical-layout

3. Code

Now we have to write the code of the application. Use the Package Explorer to navigate to the Java file of the Activity you’ve created:

src-main

The code of this tutorial is pretty much self explanatory:

package com.javacodegeeks.android.androidhorizontalscrollview;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

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

	@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;
	}

}

4. Run the application

This is the main screen of our Application:

main-screen

Now, when you scroll the button bar …:

scroll

Download Eclipse Project

This was an Android OnClickListener Example. Download the Eclipse Project of this tutorial: AndroidHorizontalScrollView.zip

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