Android First App With SoftwareTechIT | #1 ANDROID FIRST APP HELLO WORLD | Android First App Tutorial, Android Studio App,

 

This tutorial will teach you the basics of how to build an Android app using the Android Studio development environment. As Android devices become increasingly more common, demand for new apps will only increase. Android Studio is an easy to use (and free) development environment to learn on. It's best if one has a working knowledge of the Java programming language for this tutorial because it is the language used by Android. There won't be much code used in this tutorial, so I will assume that you know enough Java to understand or are willing to look up what you don't know. This will take roughly 30-60 minutes, depending on how quickly you are able to download and install Android Studio. After using this tutorial to create your first Android app, you'll be well on your way to a fun new hobby or possibly even a promising career in mobile development.

 

Step 1: Install Android Studio

1.   Go to http://developer.android.com/sdk/index.html to download Android Studio.

2.   Use the installer to install Android Studio following its instructions.

First, you learn how to create a "Hello, World!" project with Android Studio and run it. Then, you create a new interface for the app that takes user input and switches to a new screen in the app to display it.

Before you start, there are two fundamental concepts that you need to understand about Android apps: how they provide multiple entry points, and how they adapt to different devices.

 

Step 1: Create a new project

1.   Open Android Studio.

2.   Under the "Quick Start" menu, select "Start a new Android Studio project."

3.   On the "Create New Project" window that opens, name your project "HelloWorld".

4.   If you choose to, set the company name as desired*.

5.   Note where the project file location is and change it if desired.

6.   Click "Next."

7.   Make sure on that "Phone and Tablet" is the only box that is checked.

8.   If you are planning to test the app on your phone, make sure the minimum SDK is below your phone's operating system level.

9.   Click "Next."

10.                Select "Blank Activity."

11.                Click "Next."

12.                Leave all of the Activity name fields as they are.

13.                Click "Finish."

 

 

Step 3: Edit the Welcome Message in the Main Activity

1.   Navigate to the activity_main.xml tab if it is not already open.

2.   Make sure that the Design tab is open on the activity_main.xml display.

3.   Click and drag the "Hello, world!" from the upper left corner of the phone display to the center of the screen.

4.   In the project file system on the left side of the window, open the values folder.

5.   In the values folder, double-click the strings.xml file.

6.   In this file, find the line "Hello world!".

7.   After the "Hello world!" message, add "Welcome to my app!"

8.   Navigate back to the activity_main.xml tab.

9.   Make sure that your centered text now reads "Hello world! Welcome to my app!"

MainActivity.java Code:-

package com.example.firstapp;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

Activity_main.xml code:-

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>