Android app development guide for freshers by ace web academy

STEP BY STEP PROCESS TO DEVELOP YOUR OWN

ANDROID APP –A BEGINNER’S GUIDE

It’s the rage of android apps now as every business gets success and reaches the end users with its true potential. This is not down to earth process to create an outstanding app; rather every developer with basic knowledge of some coding languages like JAVA, C, C++ can do this.

So if you wanted to create an app out of your ideas, then here is the quick and simple guide which helps you to build your own android app guide in less time. Follow the simple steps and for sure you can earn handsome amount with the creative app which you have curetted.

1. Prerequisites of android app development:

If you want to create a basic android app, you should have basic knowledge on coding languages like JAVA, C, C++

Concept/idea to showcase or implement your app

System specifications to check:

The following are the required software requirements which you need to install if you are not having before you start creating the app. Doesn’t have!

Download and install the both Java tool Kit and Android Studio

http://www.acewebacademy.com/blog/wp-content/uploads/2016/06/How-to-build-your-own-Android-App-Step-by-Step-Guide.jpg

First we need to install Java Jdk, because android studio will select automatically jdk path.

Or If you want to install android studio first then you need to set “Home path'

• Java Jdk1.7 or Jdk 1.8

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

• Android Studio

http://developer.android.com/sdk/index.html

Hardware Requirements: Ensure that you are having these hardware

specifications - RAM 4GB, Hard disk 500GB

2. Wireframe:

Have a great idea to develop app? Then now draw wireframe for your basic app

and ensure that you are making use of this tool to represent the proposed

functionality of the app and the structure of the app.

There should be proper attention on the graphical elements and the functionality

of the app. When this is achieved properly, then developing the code will be

easier and you will also know how the end users are going to use it. It is also

helpful to make desired changes if you wish things are not as per the

specifications.

For example I want to develop a basic Login Demo app with login & sign up

buttons functionality. Here is my wireframe

App name: Login Demo

Login Button

SignUp Button



http://developer.android.com/sdk/index.html

3. Impeccable Design:

Design is the element which attracts the people. When they like the graphics and

the colors used for the theme of the app, then they would spend some more time

and know the details of the app or its services. So make sure that you are vigilant

about the colors and as well the images and the graphics which you put into it.

4. Start development:

Once you are done with the wireframe and then added the images and the

designs of the app, now it is time to start the coding as per the requirements.

Steps How to create android app (Login app Demo)

Step 1:

Open the Android studio and you can follow the bellow steps to create new app.

Go to file------->New ----> new project

Step 2:

Define Your app name, package name.

Here you have to enter the app name, company domain and as well the package name once

you are decided with the name.

App Name: Login Demo

Package/Domain Name: By default you can see your PC name.

package com.infasta.logindemo; here com is domain name, infasta(PC name) is user

editable name and login demo is an app name

Step 3:

Enter the form Factors of the app (phone&tab, wear, tv, glass).

Enter the details of the SDK, TV glass, Wear and then proceed further.

Form factor: It says type of your app, below are option you can find. Depends on the

requirement you need to choose.

Step 4:

Once you select the form factor, the code will be generated by default.

Select empty activity for Login App Demo

Step 5:

After you selected the form empty form factor, java class(with default class name as

MainActivity) and related xml file(with default name as activity_main)

As per your requirement you change both Java class and xml file name.

Step 6:

Once you finish step 5, your application starts building in back-end in this process dependence jar files

will be added to app and completes app building.

Build the Application

Here your project is created and now you can add the dependence jar files and build the

application

Step 7:

Once your application is built project gets created and then Java Class, Xml files open

automatically. You can see same as below

Code for Login app Demo

Step 8:

Open xml file, go to Design part and drag required 2 buttons from left side widgets window

Here you can define the button listener method inside button tag

android:onClick="loginPage"

<!—onClick=signupPage this method name you can write inside the java class

end of onCreate() method -->

In text view you can see below code.

<?xml version="1.0"encoding="utf-8"?>

<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"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="com.infasta.logindemo.MainActivity">

<Button

style="?android:attr/buttonStyleSmall"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Login"

android:id="@+id/SignUp"

android:layout_alignParentTop="true"

android:layout_alignParentLeft="true"

android:layout_alignParentStart="true"

android:layout_marginTop="108dp"

android:layout_alignParentRight="true"

android:layout_alignParentEnd="true"

android:onClick="loginPage"/>

<!—onClick=loginPage this method name you can write inside the java class


<Button



android:text="Signup"

android:id="@+id/button2"

android:layout_below="@+id/SignUp"



android:layout_alignRight="@+id/SignUp"

android:layout_alignEnd="@+id/SignUp"

android:onClick="signupPage"/>

<!—onClick=signupPage this method name you can write inside the java class


</RelativeLayout>

Step 9:

You can define the button actions above the screen in java file.

Every screen’s logical code is provided here.

MainActivity.java

package com.infasta.logindemo;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

//login button method

public void loginPage(View v){

Intent intent=new Intent(this,LoginActivity.class);

startActivity(intent);

}

//signup button method

public void signupPage(View v){



}

}

How to create the new Activity or another screen

Step 10: To create new Activity, follow the below screen and here you can defend the java class, xml

file name also.

Step 11:

This is the screen for (Login screen) xml files

activity_login.xml










tools:context="com.infasta.logindemo.LoginActivity">

<EditText



android:id="@+id/editText"






android:layout_alignParentEnd="true"

android:hint="user name"/>

<EditText



android:id="@+id/editText2"

android:layout_below="@+id/editText"



android:layout_alignRight="@+id/editText"

android:layout_alignEnd="@+id/editText"

android:hint="password"/>

<Button




android:text="Login"

android:onClick="homePage"

android:id="@+id/button"

android:layout_below="@+id/editText2"

android:layout_centerHorizontal="true"/>

</RelativeLayout>

Above the screen java file LoginActivity.java






import android.widget.EditText;

public class LoginActivity extends AppCompatActivity {

EditText nameEdt,passEdt; //user reference variable names

@Override



setContentView(R.layout.activity_login);

//register the editText id's and type cast to xml id's

nameEdt=(EditText)findViewById(R.id.editText);

passEdt=(EditText)findViewById(R.id.editText2);

}

public void homePage(View v){

//navigation one screen to another screen

//current class and target class name



}

}

Step 12:

This screen is for (signup screen) java and xml files

Activity_signup.xml










tools:context="com.infasta.logindemo.SignUpActivity">

<TextView



android:textAppearance="?android:attr/textAppearanceLarge"

android:text="New User"

android:id="@+id/textView"


android:layout_centerHorizontal="true"

android:layout_marginTop="54dp"/>

<TextView




android:text="Name"

android:id="@+id/textView2"

android:layout_below="@+id/textView"




<EditText




android:layout_alignBottom="@+id/textView2"

android:layout_alignLeft="@+id/textView"

android:layout_alignStart="@+id/textView"/>

<TextView




android:text="Phone"


android:layout_alignBottom="@+id/editText4"


android:layout_alignParentStart="true"/>

<EditText



android:inputType="phone"

android:ems="10"



android:layout_alignRight="@+id/editText3"

android:layout_alignEnd="@+id/editText3"/>

<TextView




android:text="Password"


android:layout_alignBottom="@+id/editText5"



<EditText



android:inputType="textPassword"

android:ems="10"



android:layout_alignLeft="@+id/editText4"

android:layout_alignStart="@+id/editText4"/>

<Button




android:text="signup"

android:id="@+id/button3"

android:layout_below="@+id/textView4"

android:layout_alignRight="@+id/textView"

android:layout_alignEnd="@+id/textView"


android:onClick="signup"/>

</RelativeLayout>

java file for SignupAcitvity.java






import android.widget.EditText;

public class SignUpActivity extends AppCompatActivity {

EditTextnameEdt,passEdt,phoneEdt; //user reference variable names

@Override



setContentView(R.layout.activity_sign_up);


nameEdt=(EditText)findViewById(R.id.editText3);

passEdt=(EditText)findViewById(R.id.editText4);

phoneEdt=(EditText)findViewById(R.id.editText5);

}

//button

public void signup(View v){

//get the values from edit text

String name=nameEdt.getText().toString();

String pass=passEdt.getText().toString();

String phone=phoneEdt.getText().toString();

//navigation one screen to another screen

//current class and target class name

Intent intent=new Intent(this,HomeActivity.class);

//put the values from Intent

intent.putExtra("key1",name);//key and value pair

intent.putExtra("key2",pass);

intent.putExtra("key3",phone);


}

}

Step 13 :

How to pass the values from one screen to another screen OR

Here the above signup details are shown as followed.

Ctivity_home.xml










tools:context="com.infasta.logindemo.HomeActivity">

<TextView




android:text="Name:"






<TextView



android:textAppearance="?android:attr/textAppearanceMedium"

android:text="Medium Text"


android:layout_alignTop="@+id/textView5"


android:layout_alignParentEnd="true"/>

<TextView




android:text="password"





<TextView







android:layout_alignRight="@+id/textView6"

android:layout_alignEnd="@+id/textView6"/>

<TextView




android:text="Phone"





<TextView






android:layout_alignTop="@+id/textView9"

android:layout_alignLeft="@+id/textView8"

android:layout_alignStart="@+id/textView8"/>

</RelativeLayout>

java file HomeActivity.java





import android.widget.TextView;

public class HomeActivity extends AppCompatActivity {

TextView name,pass,phone;//user reference variable names

@Override



setContentView(R.layout.activity_home);


name=(TextView)findViewById(R.id.textView6);

pass=(TextView)findViewById(R.id.textView8);

phone=(TextView)findViewById(R.id.textView10);

//get the values from Intent

Intent intent=getIntent();

//Display the values

//key1,key,key2,key3=intent key’s name

name.setText(intent.getStringExtra("key1"));pass.setText(intent.getStringExtra(

"key2"));

phone.setText(intent.getStringExtra("key3"));

}

}

Conclusion:

This is the simple guide which helps even the developers to develop the app which gets the attention of

the market. If you have an idea for business, do not stop implementing it just thinking of the budget.

Because you can even create an app and this is as simple as explained above. Just make a note of the

factors and the functionality and then you can achieve step by step in no time. Happy and successful

journey of creating the app for your simple business.

SOURCE:

HOW TO BUILD YOUR OWN ANDROID APP -STEP BY STEP GUIDE

-By Ace Web Academy Trainer

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Android app development guide for freshers by ace web academy