How to write android application code

Android version history The name Andrew and the noun Android share the Greek root andros, which means man.

How to write android application code

Return to Content Tutorial: Building an Android Application in 6 Steps A few months ago, when I started working with Android, I built an Employee Directory application as an experimentation project.

The Employee Directory application is built in six easy steps, each building on top of each other. The end result is a simple, yet functional application that allows you to: EmployeeDirectory6 is the final application.

If you prefer, you can also browse the source code here. If you just want to see how the application is built without setting up the projects, go straight to Step 1 below.

In Eclipse, create a new Workspace and set its default Java Compiler compliance level to 1. Click here for instructions on how to run your projects using the Android emulator or on your device.

Basic Layout In this first step, we define the user interface for searching employees. The default Activity of the application. Working with Lists In this second step, we add a ListView component that will be used in the following step to display the list of employees matching the search criteria.

In this step, we just use an ArrayAdapter to display sample data in the list.

The updated layout with the ListView. An ArrayAdapter is used to populate the ListView. When the user clicks the Search button, we query the database, and populate the list with the employees matching the search criteria. In onCreatewe use the DatabaseHelper class to open the database. In searchwe use a Cursor to query the database.

Layout to display each item in the list. Using Intents and passing information between Activities In this fourth step, we create an Activity to display the details of the employee selected in the list. We start the EmployeeDetails activity by creating an Intent. The Employee details activity.

We retrieve the id of the employee using getIntent. We then use a Cursor to retrieve the employee details. A simple layout to display the details of an employee. Calling, Emailing, and Texting an Employee In this fifth step, we interact with some of the built-in capabilities of our phone. We use Intents to allow the user to call, email, or text an employee.

We reuse the EmployeeDetails Activity to allow the user to display the details of the manager of the selected employee. In onListItemClickwe create an Intent corresponding to the action selected by the user, and start a new activity with that intent. Layout for each action in the actions list.

Updated employee details layout. Navigating Up and Down the Org Chart In this sixth step, we create a new Activity to display the Direct Reports of the selected employee, allowing the user of the application to navigate up and down the org chart of the organization.


We also improve some elements of the application: A new Activity to display the direct reports of a specific employee. The layout for the DirectReports Activity.

When the user selects that action, a new Intent is created for the DirectReports Activity, and a new Activity is started using that Intent. Instead of populating the database with hardcoded sample data, the employee table is now created and populated from an XML file sql.

The xml file used to create and populate the employee table. You can check it out here. Spencer This example has helped me out greatly! My question is for step 4. Every time I modify values from DatabaseHelper.

I must uninstall the application each time and reinstall it for changes to be seen.JSON stands for JavaScript Object Notation is the most popular way to serialize and transmitting data over network. In android, application uses JSON to transmit data over networks and JSON data is parsed, while it is received from cloud servers and from some where else.

JSON Parsing with Android. This article will detail how to make a simple bluetooth application using Android Studio and demo it using an Arduino to toggle an LED and send data back-and-forth. Read And Write Text File In Android Studio.

Code 1. Let’s start create project, setting of the project are show as below images which is quite straight forward. In the Target Android Devices screen, keep the default values and click Next.

In the Add an Activity to Mobile screen, select Empty Activity and click Next. In the Configure Activity screen, keep the default values and click Finish. There are two primary integrated development environments (IDE) for Android.

An IDE is the main program where you'll write code and put your app together. It can help you organize and edit the various files in your app, manage the packages and supporting libraries you app will need, and test it out on real devices or emulators.

Image: Working Friendly Chat app.

how to write android application code

Welcome to the Friendly Chat codelab. In this codelab, you'll learn how to use the Firebase platform to create Android applications.

How to Write Android Apps (Even If You Aren’t A Programmer)