Fixed Camera Source access and Improved the Camera UI

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.android.support:appcompat-v7:26.1.0'
     compile 'com.google.android.gms:play-services:7.8+'
 }

app/src/main/AndroidManifest.xml

@@ -4,6 +4,8 @@
 
     <uses-permission android:name="android.permission.CAMERA"/>
     <uses-permission android:name="android.permission.CAPTURE_VIDEO_OUTPUT"/>
+    <uses-feature android:name="android.hardware.camera.autofocus"
+        android:required="true" />
 
     <meta-data android:name="com.google.android.gms.vision.DEPENDENCIES" android:value="barcode"/>
 
@@ -12,7 +14,7 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme" >
+        android:theme="@style/AppTheme">
         <activity android:name=".MainActivity" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/com/example/android/barcode_scanner/MainActivity.java

@@ -1,7 +1,12 @@
 package com.example.android.barcode_scanner;
 
+import android.Manifest;
 import android.app.Activity;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageManager;
 import android.os.Bundle;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
 import android.util.Log;
 import android.util.SparseArray;
 import android.view.SurfaceHolder;
@@ -17,11 +22,23 @@
 
 public class MainActivity extends Activity {
 
+    private static final int CAMERA_PERMISSION_CAMERA = 0x000000;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
+        setRequestedOrientation(ActivityInfo
+                .SCREEN_ORIENTATION_PORTRAIT);
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        //Check for Camera Permission
+        if (ContextCompat.checkSelfPermission(MainActivity.this,
+                Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
+
+                ActivityCompat.requestPermissions(MainActivity.this,
+                        new String[]{Manifest.permission.CAMERA}, CAMERA_PERMISSION_CAMERA);
+        }
+
         final SurfaceView cameraView = (SurfaceView) findViewById(R.id.camera_view);
         final TextView barcodeInfo = (TextView) findViewById(R.id.code_info);
         BarcodeDetector barcodeDetector =
@@ -33,10 +50,16 @@ protected void onCreate(Bundle savedInstanceState) {
                 .Builder(this, barcodeDetector)
                 .setRequestedPreviewSize(640, 480)
                 .build();
+
         cameraView.getHolder().addCallback(new SurfaceHolder.Callback() {
             @Override
             public void surfaceCreated(SurfaceHolder holder) {
                 try {
+                    if (ActivityCompat.checkSelfPermission(MainActivity.this,
+                            Manifest.permission.CAMERA)
+                            != PackageManager.PERMISSION_GRANTED) {
+                        return;
+                    }
                     cameraSource.start(cameraView.getHolder());
 
                 } catch (IOException ie) {

app/src/main/res/layout/activity_main.xml

@@ -1,25 +1,30 @@
 <?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">
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/bg_color">
 
     <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="300dp"
+        android:layout_height="300dp"
+        android:layout_marginTop="16dp"
+        android:layout_centerHorizontal="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:text="@string/text"
+        android:layout_below="@id/camera_view"
+        android:layout_marginTop="16dp"
         android:layout_marginLeft="16dp"
-        android:text="Nothing to read."
-        android:layout_alignParentTop="true"
-        />
+        android:layout_marginRight="16dp"
+        android:layout_marginBottom="10dp"/>
+
+</RelativeLayout>
+
+
 
-</RelativeLayout>

app/src/main/res/values/colors.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="colorPrimary">#3F51B5</color>
-    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorPrimary">#8e8d8d</color>
+    <color name="colorPrimaryDark">#434242</color>
     <color name="colorAccent">#FF4081</color>
+    <color name="bg_color">#d7d6d6</color>
 </resources>

app/src/main/res/values/strings.xml

@@ -1,3 +1,4 @@
 <resources>
     <string name="app_name">Barcode_Scanner</string>
+    <string name="text">Nothing to read.</string>
 </resources>

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()
     }
 }
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Sun Aug 21 00:53:27 IST 2016
+#Wed Oct 18 13:36:45 WAT 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