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Initial commit for the QRCodeScannerSample application
Change-Id: I6fb65b73c0b77a1ba2b0bcd59e7414dbd21dbf13
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‎QRCodeScannerSample/.gitignore

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*.iml
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.gradle
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/local.properties
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.idea
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.project
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.settings
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.DS_Store
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/bin
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/build
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/captures
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/out
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.externalNativeBuild
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.cxx

‎QRCodeScannerSample/README.md

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# Glass QR Code Scanner Sample
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This project shows how to scan and read the QR codes using touch gestures,
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the [CameraX API](https://developer.android.com/training/camerax) and
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the [ZXing API](https://github.com/zxing/zxing/wiki/Getting-Started-Developing).
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## Running
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This sample does not require any additional setup. Open the project in Android Studio, connect your device,
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and press Play to launch the app!

‎QRCodeScannerSample/app/.gitignore

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/bin
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/build

‎QRCodeScannerSample/app/build.gradle

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/*
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* Copyright 2019 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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apply plugin: 'com.android.application'
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android {
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compileSdkVersion 29
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defaultConfig {
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applicationId "com.example.glass.glassqrcodescanner"
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minSdkVersion 27
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targetSdkVersion 29
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versionCode 1
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versionName "1.0"
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}
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buildTypes {
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release {
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minifyEnabled false
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}
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}
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compileOptions {
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sourceCompatibility JavaVersion.VERSION_1_8
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targetCompatibility JavaVersion.VERSION_1_8
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}
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}
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dependencies {
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implementation 'androidx.appcompat:appcompat:1.1.0'
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implementation 'androidx.camera:camera-core:1.0.0-alpha06'
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implementation 'androidx.camera:camera-camera2:1.0.0-alpha06'
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implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
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implementation 'com.google.zxing:core:3.2.1'
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}

‎QRCodeScannerSample/app/src/main/AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?><!--
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Copyright 2019 Google LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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package="com.example.glass.qrcodescannersample">
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<uses-feature android:name="android.hardware.camera" />
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<uses-permission android:name="android.permission.CAMERA" />
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/AppTheme"
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tools:ignore="AllowBackup,GoogleAppIndexingWarning">
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<!--
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Changes Glass touchpad response from the following key strokes:
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- Enter
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- Tab
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- Shift + Tab
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- Back button
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- Home button
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- Arrows
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to the motion events, enabling this app to use the touch gestures.
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-->
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<meta-data
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android:name="com.google.android.glass.TouchEnabledApplication"
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android:value="true" />
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<activity android:name="com.example.glass.qrcodescannersample.MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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<!--
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Makes this app visible on the application list in the Glass Launcher.
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-->
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<category android:name="com.google.android.glass.category.DIRECTORY" />
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</intent-filter>
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</activity>
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<activity android:name="com.example.glass.qrcodescannersample.CameraActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.DEFAULT" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎QRCodeScannerSample/app/src/main/java/com/example/glass/qrcodescannersample/BaseActivity.java

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/*
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* Copyright 2019 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.glass.qrcodescannersample;
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import android.os.Bundle;
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import android.view.MotionEvent;
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import android.view.View;
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import androidx.annotation.Nullable;
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import androidx.fragment.app.FragmentActivity;
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import com.example.glass.qrcodescannersample.GlassGestureDetector.OnGestureListener;
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/**
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* Base Activity class used to hide the system UI and capture gestures.
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*/
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public abstract class BaseActivity extends FragmentActivity implements OnGestureListener {
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private GlassGestureDetector glassGestureDetector;
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private View decorView;
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@Override
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protected void onCreate(@Nullable Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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decorView = getWindow().getDecorView();
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decorView.setOnSystemUiVisibilityChangeListener(visibility -> {
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if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
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hideSystemUI();
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}
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});
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glassGestureDetector = new GlassGestureDetector(this, this);
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}
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@Override
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protected void onResume() {
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super.onResume();
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hideSystemUI();
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}
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@Override
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public boolean dispatchTouchEvent(MotionEvent ev) {
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return glassGestureDetector.onTouchEvent(ev) || super.dispatchTouchEvent(ev);
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}
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private void hideSystemUI() {
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decorView.setSystemUiVisibility(
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View.SYSTEM_UI_FLAG_IMMERSIVE
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| View.SYSTEM_UI_FLAG_LAYOUT_STABLE
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| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
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| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
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| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
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| View.SYSTEM_UI_FLAG_FULLSCREEN);
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}
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}

‎QRCodeScannerSample/app/src/main/java/com/example/glass/qrcodescannersample/CameraActivity.java

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/*
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* Copyright 2019 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.glass.qrcodescannersample;
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import android.Manifest.permission;
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import android.app.Activity;
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import android.content.Intent;
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import android.content.pm.PackageManager;
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import android.os.Bundle;
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import android.util.DisplayMetrics;
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import android.util.Size;
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import android.view.TextureView;
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import androidx.annotation.NonNull;
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import androidx.camera.core.CameraX;
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import androidx.core.content.ContextCompat;
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import com.example.glass.qrcodescannersample.GlassGestureDetector.Gesture;
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import com.example.glass.qrcodescannersample.QRCodeImageAnalysis.QrCodeAnalysisCallback;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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/**
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* Activity responsible for requesting camera permission, starting camera and returning scanned QR
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* code as a result.
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*/
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public class CameraActivity extends BaseActivity implements QrCodeAnalysisCallback {
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/**
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* Key for the scan result in an {@link Intent}.
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*/
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public static final String QR_SCAN_RESULT = "SCAN_RESULT";
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/**
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* Request code for the camera permission. This value doesn't have any special meaning.
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*/
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private static final int CAMERA_PERMISSIONS_REQUEST_CODE = 105;
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/**
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* Single thread executor service for the image analysis purposes.
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*/
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private ExecutorService executorService;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_camera);
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executorService = Executors.newSingleThreadExecutor();
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if (ContextCompat.checkSelfPermission(this,
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permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
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startCamera();
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} else {
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requestPermissions(new String[]{permission.CAMERA}, CAMERA_PERMISSIONS_REQUEST_CODE);
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}
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}
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@Override
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protected void onDestroy() {
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super.onDestroy();
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executorService.shutdown();
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}
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@Override
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public boolean onGesture(Gesture gesture) {
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switch (gesture) {
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case SWIPE_DOWN:
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finishNoQR();
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return true;
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default:
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return false;
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}
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}
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@Override
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public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
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@NonNull int[] grantResults) {
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if (requestCode == CAMERA_PERMISSIONS_REQUEST_CODE) {
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for (int result : grantResults) {
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if (result != PackageManager.PERMISSION_GRANTED) {
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finishNoQR();
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} else {
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startCamera();
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}
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}
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} else {
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super.onRequestPermissionsResult(requestCode, permissions, grantResults);
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}
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}
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@Override
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public void onQrCodeDetected(String result) {
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final Intent intent = new Intent();
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intent.putExtra(QR_SCAN_RESULT, result);
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setResult(Activity.RESULT_OK, intent);
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finish();
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}
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private void startCamera() {
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final TextureView textureView = findViewById(R.id.view_finder);
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final QRCodePreview qrCodePreview = new QRCodePreview(
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CameraConfigProvider.getPreviewConfig(getDisplaySize()),
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textureView);
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final QRCodeImageAnalysis qrCodeImageAnalysis = new QRCodeImageAnalysis(
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CameraConfigProvider.getImageAnalysisConfig(), executorService, this);
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CameraX.bindToLifecycle(this, qrCodePreview.getUseCase(), qrCodeImageAnalysis.getUseCase());
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}
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private void finishNoQR() {
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setResult(Activity.RESULT_CANCELED);
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finish();
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}
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private Size getDisplaySize() {
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final DisplayMetrics displayMetrics = new DisplayMetrics();
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getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
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return new Size(displayMetrics.widthPixels, displayMetrics.heightPixels);
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}
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}

‎QRCodeScannerSample/app/src/main/java/com/example/glass/qrcodescannersample/CameraConfigProvider.java

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/*
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* Copyright 2019 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.glass.qrcodescannersample;
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import android.util.Size;
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import androidx.camera.core.ImageAnalysis.ImageReaderMode;
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import androidx.camera.core.ImageAnalysisConfig;
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import androidx.camera.core.PreviewConfig;
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/**
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* Provides appropriate {@link androidx.camera.core.UseCaseConfig} objects.
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*/
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public class CameraConfigProvider {
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/**
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* Returns {@link PreviewConfig} object to create the {@link androidx.camera.core.Preview}
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* instance. It is important to build {@link PreviewConfig} object with the appropriate display
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* size.
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*/
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public static PreviewConfig getPreviewConfig(Size displaySize) {
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return new PreviewConfig.Builder()
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.setTargetResolution(displaySize)
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.build();
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}
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/**
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* Returns {@link ImageAnalysisConfig} object to create the {@link androidx.camera.core.ImageAnalysis}
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* instance.
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*/
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public static ImageAnalysisConfig getImageAnalysisConfig() {
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return new ImageAnalysisConfig.Builder()
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.setImageReaderMode(ImageReaderMode.ACQUIRE_LATEST_IMAGE)
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.build();
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}
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}

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