diff --git a/app/build.gradle b/app/build.gradle
index a84c0d4..3a69052 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 24
-    buildToolsVersion "24.0.0"
+    compileSdkVersion 26
+    buildToolsVersion '26.0.2'
 
     defaultConfig {
         applicationId "com.example.android.barcode_scanner"
         minSdkVersion 21
-        targetSdkVersion 24
+        targetSdkVersion 26
         versionCode 1
         versionName "1.0"
     }
@@ -22,6 +22,6 @@ android {
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:24.1.1'
-    compile 'com.google.android.gms:play-services:7.8+'
+    compile 'com.android.support:appcompat-v7:26.1.0'
+    compile 'com.google.android.gms:play-services:11.0.2'
 }
diff --git a/app/src/main/java/com/example/android/barcode_scanner/MainActivity.java b/app/src/main/java/com/example/android/barcode_scanner/MainActivity.java
index 7194e9b..3e0bfb4 100644
--- a/app/src/main/java/com/example/android/barcode_scanner/MainActivity.java
+++ b/app/src/main/java/com/example/android/barcode_scanner/MainActivity.java
@@ -1,12 +1,18 @@
 package com.example.android.barcode_scanner;
 
+import android.Manifest;
 import android.app.Activity;
+import android.content.pm.PackageManager;
+import android.os.Build;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v4.app.ActivityCompat;
 import android.util.Log;
 import android.util.SparseArray;
 import android.view.SurfaceHolder;
 import android.view.SurfaceView;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import com.google.android.gms.vision.CameraSource;
 import com.google.android.gms.vision.Detector;
@@ -17,19 +23,22 @@
 
 public class MainActivity extends Activity {
 
+    private CameraSource cameraSource;
+    private SurfaceView cameraView;
+    private int CAMERA_REQUEST_CODE=334;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        final SurfaceView cameraView = (SurfaceView) findViewById(R.id.camera_view);
-        final TextView barcodeInfo = (TextView) findViewById(R.id.code_info);
+        cameraView = findViewById(R.id.camera_view);
+        final TextView barcodeInfo = findViewById(R.id.code_info);
         BarcodeDetector barcodeDetector =
                 new BarcodeDetector.Builder(this)
                         .setBarcodeFormats(Barcode.QR_CODE)
                         .build();
 
-        final CameraSource cameraSource = new CameraSource
+        cameraSource = new CameraSource
                 .Builder(this, barcodeDetector)
                 .setRequestedPreviewSize(640, 480)
                 .build();
@@ -37,6 +46,12 @@ protected void onCreate(Bundle savedInstanceState) {
             @Override
             public void surfaceCreated(SurfaceHolder holder) {
                 try {
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                        if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
+                            requestPermissions(new String[]{Manifest.permission.CAMERA}, CAMERA_REQUEST_CODE);
+                            return;
+                        }
+                    }
                     cameraSource.start(cameraView.getHolder());
 
                 } catch (IOException ie) {
@@ -75,4 +90,27 @@ public void run() {
             }
         });
     }
+
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+
+        if (requestCode == CAMERA_REQUEST_CODE) {
+            if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA)
+                    == PackageManager.PERMISSION_GRANTED) {
+                if (cameraSource != null) {
+                    try {
+                        cameraSource.start(cameraView.getHolder());
+                    } catch (IOException e) {
+                        e.printStackTrace();
+                    }
+                }
+
+            } else {
+                Toast.makeText(this, "Need camera permission", Toast.LENGTH_LONG).show();
+            }
+
+        }
+    }
 }
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index f8d6ba8..d433551 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,25 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent" android:layout_height="match_parent"
-    android:padding="16dp">
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+
 
     <SurfaceView
-        android:layout_width="640px"
-        android:layout_height="480px"
-        android:layout_centerVertical="true"
-        android:layout_alignParentLeft="true"
         android:id="@+id/camera_view"
-        />
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_alignParentLeft="true"
+        android:layout_centerVertical="true" />
 
     <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
         android:id="@+id/code_info"
-        android:layout_toRightOf="@+id/camera_view"
-        android:textSize="20sp"
-        android:layout_marginLeft="16dp"
-        android:text="Nothing to read."
-        android:layout_alignParentTop="true"
-        />
-
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textColor="@android:color/white"
+        android:text="@string/str_nothing_to_read"
+        android:textSize="@dimen/text_size_medium" />
 </RelativeLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
index 47c8224..0a8eba9 100644
--- a/app/src/main/res/values/dimens.xml
+++ b/app/src/main/res/values/dimens.xml
@@ -2,4 +2,7 @@
     <!-- Default screen margins, per the Android Design guidelines. -->
     <dimen name="activity_horizontal_margin">16dp</dimen>
     <dimen name="activity_vertical_margin">16dp</dimen>
+    <dimen name="text_size_small">14sp</dimen>
+    <dimen name="text_size_medium">16sp</dimen>
+    <dimen name="text_size_large">18sp</dimen>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 62f6530..90fbb51 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,4 @@
 <resources>
     <string name="app_name">Barcode_Scanner</string>
+    <string name="str_nothing_to_read">Nothing to read.</string>
 </resources>
diff --git a/build.gradle b/build.gradle
index c20bca1..92d45f7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,9 +3,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.2'
+        classpath 'com.android.tools.build:gradle:3.0.0-beta7'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -15,6 +16,7 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a2a2950..bada4b9 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sun Aug 21 00:53:27 IST 2016
+#Sat Oct 14 10:43:32 IST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip