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<uses-feature android:name="android.hardware.nfc"
android:required="true"/>

<!-- Internet Permissions -->
<uses-permission android:name="android.permission.INTERNET" />

</manifest>
*****************************activity_main****************************
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"

android:gravity="center"
android:orientation="vertical"
tools:context="kr.icehs.intec.emart.MainActivity"
android:weightSum="1"
android:background="#FFFFFF">

<ImageView
android:id="@+id/mart_logo"
android:layout_width="wrap_content"
android:layout_height="91dp"
android:src="@drawable/emart"
android:layout_weight="0.04" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Consumer"
android:id="@+id/btn_consumer"
android:textColor="#FFFFFF"
android:textSize="15dp"
android:background="#FC961E"
android:onClick="onbtn_consumerClicked"/>
/>

<Space
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.10" />

<Button

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