QR-Code Scanning Using Android Studio

Ravi Shankar
Aug 17, 2017
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INTRODUCTION

Android is one of the most popular operating systems for mobile. In this article, we will learn how to scan QR code without camera options using Android Studio. Android is kernel based operating system that allows the users to modify the GUI component and source code.

Requirement

XML and Java knowledge
Android Studio
Android Emulator or Android mobile

Step to be followed

Carefully follow the below steps to create QR code scan application using Android Studio. The source code is also attached.

Step 1

Open Android Studio and create a new project. Give an application name, company domain, check Include C++ option if you wish to use C++ for coding the project, and click Next.

Step 2

Select the Android minimum SDK. It will show the high percentage of people using that SDK. Now, click "Next".

Step 3

After the process completes, extract the app. Double clicking on the manifests will show Android manifest.XML page.

Step 4

We can add some code here. I have given the source code already so you can use that code or write your own code.

XML Code

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.ravir.qrcode">
<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" 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>
<meta-data android:name="com.google.gms.vision.DEPENDENCIES" android:value="barcode" /> </activity>
<meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" /> </application>
</manifest>

Step 5

In this step, the QR Code is generated. We can go to browse https://www.qrcode-monkey.com/ to open QR code page. Select the Text you wish to write. Just click "Create QR code" and a few seconds later, click on Download PNG.

Step 6

Then, extract the res file, click on Layout down arrow, click to select Activity_Main.xml.

Write a simple XML code. I have given the code in an attachement but you can use your own code too.

Xml 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:id="@+id/activity_main" 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.example.ravir.qrcode.MainActivity">
<LinearLayout android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content">
<ImageView android:id="@+id/imageview" android:layout_width="300dp" android:layout_height="300dp" android:layout_gravity="center_horizontal" />
<Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_gravity="center_horizontal" android:text="Click to Scan" android:id="@+id/btnscan" />
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textview" android:textSize="20dp" android:text="" android:layout_gravity="center_horizontal" />
</LinearLayout>
</RelativeLayout>