Can use the camera in the app.

software/OpenBookScannerApp/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild

software/OpenBookScannerApp/app/.gitignore

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+/build

software/OpenBookScannerApp/app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "com.github.fablabcb.openbookscannerapp"
+        minSdkVersion 14
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
+    implementation 'com.android.support:design:28.0.0-alpha3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}

software/OpenBookScannerApp/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

software/OpenBookScannerApp/app/src/androidTest/java/com/github/fablabcb/openbookscannerapp/ExampleInstrumentedTest.java

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+package com.github.fablabcb.openbookscannerapp;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.github.fablabcb.openbookscannerapp", appContext.getPackageName());
+    }
+}

software/OpenBookScannerApp/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.github.fablabcb.openbookscannerapp">
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-feature android:name="android.hardware.camera" android:required="true" />
+    <uses-feature android:name="android.hardware.camera.autofocus" android:required="true" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity
+            android:name=".MainActivity"
+            android:label="@string/app_name"
+            android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

software/OpenBookScannerApp/app/src/main/java/com/github/fablabcb/openbookscannerapp/MainActivity.java

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+package com.github.fablabcb.openbookscannerapp;
+
+import android.Manifest;
+import android.content.pm.PackageManager;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.hardware.Camera;
+import android.hardware.Camera.CameraInfo;
+import android.os.Bundle;
+import android.support.design.widget.FloatingActionButton;
+import android.support.v4.app.ActivityCompat;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+public class MainActivity extends AppCompatActivity {
+
+    private final static String DEBUG_TAG = "MainActivity";
+
+    private ImageView imageView;
+    private FloatingActionButton fab;
+    private TextView statusText;
+    private Toolbar toolbar;
+    private boolean cameraIsAvailable;
+    private boolean hasCameraFeature;
+    private boolean cameraIsDisabled;
+    private Camera camera;
+
+
+
+    protected void setAttributesOnCreate() {
+        setContentView(R.layout.activity_main);
+        toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+        imageView = (ImageView) findViewById(R.id.imageView);
+        fab = (FloatingActionButton) findViewById(R.id.fab);
+        statusText = (TextView) findViewById(R.id.statusText);
+        PackageManager pm = getApplicationContext().getPackageManager();
+        hasCameraFeature =  pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);
+        if (hasCameraFeature) {
+            int cameraId = findFrontFacingCamera();
+            try {
+                camera = Camera.open(cameraId);
+                cameraIsDisabled = false;
+            } catch (RuntimeException e) {
+                cameraIsDisabled = true;
+            }
+        }
+        cameraIsAvailable = hasCameraFeature && !cameraIsDisabled;
+    }
+
+    private int findFrontFacingCamera() {
+        // Search for the front facing camera
+        // from http://www.vogella.com/tutorials/AndroidCamera/article.html
+        int numberOfCameras = Camera.getNumberOfCameras();
+        for (int cameraId = 0; cameraId < numberOfCameras; cameraId++) {
+            CameraInfo info = new CameraInfo();
+            Camera.getCameraInfo(cameraId, info);
+            if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
+                Log.d(DEBUG_TAG, "Camera found");
+                return cameraId;
+            }
+        }
+        return -1;
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setAttributesOnCreate();
+
+
+        statusText.setText(cameraIsAvailable ? "A camera is available." :
+                           cameraIsDisabled  ? "Camera use is disabled for this app: no permission." :
+                           !hasCameraFeature  ? "This app has no camera feature." : "TODO");
+        if (!cameraIsAvailable) {
+            // from https://androidkennel.org/android-camera-access-tutorial/
+            // imageView.setImageResource(); // TODO: not picture
+            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
+        }
+
+        fab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                if (cameraIsAvailable) {
+                    camera.startPreview();
+                    camera.takePicture(null, null,
+                            new Camera.PictureCallback() {
+                                @Override
+                                public void onPictureTaken(byte[] data, Camera camera) {
+                                    Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length);
+                                    imageView.setImageBitmap(bm);
+                                }
+                            });
+                }
+            }
+        });
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.menu_main, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+
+        //noinspection SimplifiableIfStatement
+        if (id == R.id.action_settings) {
+            return true;
+        }
+
+        return super.onOptionsItemSelected(item);
+    }
+
+
+    @Override
+    protected void onPause() {
+        // from http://www.vogella.com/tutorials/AndroidCamera/article.html
+        if (camera != null) {
+            camera.release();
+            camera = null;
+        }
+        super.onPause();
+    }
+}

software/OpenBookScannerApp/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

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+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportHeight="108"
+    android:viewportWidth="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1" />
+</vector>