├── .gitattributes
├── .gitignore
├── .idea
├── .name
├── codeStyles
│ └── Project.xml
├── gradle.xml
├── jarRepositories.xml
├── misc.xml
└── runConfigurations.xml
├── app
├── .gitignore
├── build.gradle
├── proguard-rules.pro
└── src
│ ├── androidTest
│ └── java
│ │ └── com
│ │ └── learntodroid
│ │ └── androidqrcodescanner
│ │ └── ExampleInstrumentedTest.java
│ ├── main
│ ├── AndroidManifest.xml
│ ├── java
│ │ └── com
│ │ │ └── learntodroid
│ │ │ └── androidqrcodescanner
│ │ │ ├── MainActivity.java
│ │ │ ├── QRCodeFoundListener.java
│ │ │ └── QRCodeImageAnalyzer.java
│ └── res
│ │ ├── drawable-v24
│ │ └── ic_launcher_foreground.xml
│ │ ├── drawable
│ │ └── ic_launcher_background.xml
│ │ ├── layout
│ │ └── activity_main.xml
│ │ ├── mipmap-anydpi-v26
│ │ ├── ic_launcher.xml
│ │ └── ic_launcher_round.xml
│ │ ├── mipmap-hdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-mdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xxhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xxxhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ └── values
│ │ ├── colors.xml
│ │ ├── strings.xml
│ │ └── styles.xml
│ └── test
│ └── java
│ └── com
│ └── learntodroid
│ └── androidqrcodescanner
│ └── ExampleUnitTest.java
├── build.gradle
├── gradle.properties
├── gradle
└── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── settings.gradle
/.gitattributes:
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2 | * text=auto
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/.gitignore:
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1 | *.iml
2 | .gradle
3 | /local.properties
4 | /.idea/caches
5 | /.idea/libraries
6 | /.idea/modules.xml
7 | /.idea/workspace.xml
8 | /.idea/navEditor.xml
9 | /.idea/assetWizardSettings.xml
10 | .DS_Store
11 | /build
12 | /captures
13 | .externalNativeBuild
14 | .cxx
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/.idea/.name:
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1 | Android QR Code Scanner
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/.idea/codeStyles/Project.xml:
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/.idea/runConfigurations.xml:
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/app/.gitignore:
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1 | /build
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/app/build.gradle:
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1 | apply plugin: 'com.android.application'
2 |
3 | android {
4 | compileSdkVersion 29
5 |
6 | defaultConfig {
7 | applicationId "com.learntodroid.androidqrcodescanner"
8 | minSdkVersion 21
9 | targetSdkVersion 29
10 | versionCode 1
11 | versionName "1.0"
12 |
13 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
14 | }
15 |
16 | buildTypes {
17 | release {
18 | minifyEnabled false
19 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
20 | }
21 | }
22 |
23 | compileOptions {
24 | sourceCompatibility JavaVersion.VERSION_1_8
25 | targetCompatibility JavaVersion.VERSION_1_8
26 | }
27 | }
28 |
29 | dependencies {
30 | implementation fileTree(dir: "libs", include: ["*.jar"])
31 | implementation 'androidx.appcompat:appcompat:1.1.0'
32 | implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
33 | testImplementation 'junit:junit:4.12'
34 | androidTestImplementation 'androidx.test.ext:junit:1.1.1'
35 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
36 |
37 | def camerax_version = "1.0.0-beta07"
38 | implementation "androidx.camera:camera-camera2:$camerax_version"
39 | implementation "androidx.camera:camera-lifecycle:$camerax_version"
40 | implementation "androidx.camera:camera-view:1.0.0-alpha14"
41 |
42 | // qrcode reader
43 | implementation 'com.google.zxing:core:3.3.0'
44 | }
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/app/proguard-rules.pro:
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1 | # Add project specific ProGuard rules here.
2 | # You can control the set of applied configuration files using the
3 | # proguardFiles setting in build.gradle.
4 | #
5 | # For more details, see
6 | # http://developer.android.com/guide/developing/tools/proguard.html
7 |
8 | # If your project uses WebView with JS, uncomment the following
9 | # and specify the fully qualified class name to the JavaScript interface
10 | # class:
11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
12 | # public *;
13 | #}
14 |
15 | # Uncomment this to preserve the line number information for
16 | # debugging stack traces.
17 | #-keepattributes SourceFile,LineNumberTable
18 |
19 | # If you keep the line number information, uncomment this to
20 | # hide the original source file name.
21 | #-renamesourcefileattribute SourceFile
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/app/src/androidTest/java/com/learntodroid/androidqrcodescanner/ExampleInstrumentedTest.java:
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1 | package com.learntodroid.androidqrcodescanner;
2 |
3 | import android.content.Context;
4 |
5 | import androidx.test.platform.app.InstrumentationRegistry;
6 | import androidx.test.ext.junit.runners.AndroidJUnit4;
7 |
8 | import org.junit.Test;
9 | import org.junit.runner.RunWith;
10 |
11 | import static org.junit.Assert.*;
12 |
13 | /**
14 | * Instrumented test, which will execute on an Android device.
15 | *
16 | * @see Testing documentation
17 | */
18 | @RunWith(AndroidJUnit4.class)
19 | public class ExampleInstrumentedTest {
20 | @Test
21 | public void useAppContext() {
22 | // Context of the app under test.
23 | Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
24 | assertEquals("com.learntodroid.androidqrcodescanner", appContext.getPackageName());
25 | }
26 | }
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/app/src/main/AndroidManifest.xml:
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/app/src/main/java/com/learntodroid/androidqrcodescanner/MainActivity.java:
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1 | package com.learntodroid.androidqrcodescanner;
2 |
3 | import androidx.annotation.NonNull;
4 | import androidx.appcompat.app.AppCompatActivity;
5 | import androidx.camera.core.Camera;
6 | import androidx.camera.core.CameraSelector;
7 | import androidx.camera.core.ImageAnalysis;
8 | import androidx.camera.core.Preview;
9 | import androidx.camera.lifecycle.ProcessCameraProvider;
10 | import androidx.camera.view.PreviewView;
11 | import androidx.core.app.ActivityCompat;
12 | import androidx.core.content.ContextCompat;
13 | import androidx.lifecycle.LifecycleOwner;
14 |
15 | import android.Manifest;
16 | import android.content.pm.PackageManager;
17 | import android.os.Bundle;
18 | import android.util.Log;
19 | import android.util.Size;
20 | import android.view.View;
21 | import android.widget.Button;
22 | import android.widget.Toast;
23 |
24 | import com.google.common.util.concurrent.ListenableFuture;
25 |
26 | import java.util.concurrent.ExecutionException;
27 |
28 | public class MainActivity extends AppCompatActivity {
29 | private static final int PERMISSION_REQUEST_CAMERA = 0;
30 |
31 | private PreviewView previewView;
32 | private ListenableFuture cameraProviderFuture;
33 |
34 | private Button qrCodeFoundButton;
35 | private String qrCode;
36 |
37 | @Override
38 | protected void onCreate(Bundle savedInstanceState) {
39 | super.onCreate(savedInstanceState);
40 | setContentView(R.layout.activity_main);
41 |
42 | previewView = findViewById(R.id.activity_main_previewView);
43 |
44 | qrCodeFoundButton = findViewById(R.id.activity_main_qrCodeFoundButton);
45 | qrCodeFoundButton.setVisibility(View.INVISIBLE);
46 | qrCodeFoundButton.setOnClickListener(new View.OnClickListener() {
47 | @Override
48 | public void onClick(View v) {
49 | Toast.makeText(getApplicationContext(), qrCode, Toast.LENGTH_SHORT).show();
50 | Log.i(MainActivity.class.getSimpleName(), "QR Code Found: " + qrCode);
51 | }
52 | });
53 |
54 | cameraProviderFuture = ProcessCameraProvider.getInstance(this);
55 | requestCamera();
56 | }
57 |
58 | private void requestCamera() {
59 | if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
60 | startCamera();
61 | } else {
62 | if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {
63 | ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, PERMISSION_REQUEST_CAMERA);
64 | } else {
65 | ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, PERMISSION_REQUEST_CAMERA);
66 | }
67 | }
68 | }
69 |
70 | @Override
71 | public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
72 | if (requestCode == PERMISSION_REQUEST_CAMERA) {
73 | if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
74 | startCamera();
75 | } else {
76 | Toast.makeText(this, "Camera Permission Denied", Toast.LENGTH_SHORT).show();
77 | }
78 | }
79 | }
80 |
81 | private void startCamera() {
82 | cameraProviderFuture.addListener(() -> {
83 | try {
84 | ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
85 | bindCameraPreview(cameraProvider);
86 | } catch (ExecutionException | InterruptedException e) {
87 | Toast.makeText(this, "Error starting camera " + e.getMessage(), Toast.LENGTH_SHORT).show();
88 | }
89 | }, ContextCompat.getMainExecutor(this));
90 | }
91 |
92 | private void bindCameraPreview(@NonNull ProcessCameraProvider cameraProvider) {
93 | previewView.setPreferredImplementationMode(PreviewView.ImplementationMode.SURFACE_VIEW);
94 |
95 | Preview preview = new Preview.Builder()
96 | .build();
97 |
98 | CameraSelector cameraSelector = new CameraSelector.Builder()
99 | .requireLensFacing(CameraSelector.LENS_FACING_BACK)
100 | .build();
101 |
102 | preview.setSurfaceProvider(previewView.createSurfaceProvider());
103 |
104 | ImageAnalysis imageAnalysis =
105 | new ImageAnalysis.Builder()
106 | .setTargetResolution(new Size(1280, 720))
107 | .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
108 | .build();
109 |
110 | imageAnalysis.setAnalyzer(ContextCompat.getMainExecutor(this), new QRCodeImageAnalyzer(new QRCodeFoundListener() {
111 | @Override
112 | public void onQRCodeFound(String _qrCode) {
113 | qrCode = _qrCode;
114 | qrCodeFoundButton.setVisibility(View.VISIBLE);
115 | }
116 |
117 | @Override
118 | public void qrCodeNotFound() {
119 | qrCodeFoundButton.setVisibility(View.INVISIBLE);
120 | }
121 | }));
122 |
123 | Camera camera = cameraProvider.bindToLifecycle((LifecycleOwner)this, cameraSelector, imageAnalysis, preview);
124 | }
125 | }
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/app/src/main/java/com/learntodroid/androidqrcodescanner/QRCodeFoundListener.java:
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1 | package com.learntodroid.androidqrcodescanner;
2 |
3 | public interface QRCodeFoundListener {
4 | void onQRCodeFound(String qrCode);
5 | void qrCodeNotFound();
6 | }
7 |
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/app/src/main/java/com/learntodroid/androidqrcodescanner/QRCodeImageAnalyzer.java:
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1 | package com.learntodroid.androidqrcodescanner;
2 |
3 | import androidx.annotation.NonNull;
4 | import androidx.camera.core.ImageAnalysis;
5 | import androidx.camera.core.ImageProxy;
6 |
7 | import com.google.zxing.BinaryBitmap;
8 | import com.google.zxing.ChecksumException;
9 | import com.google.zxing.FormatException;
10 | import com.google.zxing.NotFoundException;
11 | import com.google.zxing.PlanarYUVLuminanceSource;
12 | import com.google.zxing.Result;
13 | import com.google.zxing.common.HybridBinarizer;
14 | import com.google.zxing.multi.qrcode.QRCodeMultiReader;
15 |
16 | import java.nio.ByteBuffer;
17 |
18 | import static android.graphics.ImageFormat.YUV_420_888;
19 | import static android.graphics.ImageFormat.YUV_422_888;
20 | import static android.graphics.ImageFormat.YUV_444_888;
21 |
22 | public class QRCodeImageAnalyzer implements ImageAnalysis.Analyzer {
23 | private QRCodeFoundListener listener;
24 |
25 | public QRCodeImageAnalyzer(QRCodeFoundListener listener) {
26 | this.listener = listener;
27 | }
28 |
29 | @Override
30 | public void analyze(@NonNull ImageProxy image) {
31 | if (image.getFormat() == YUV_420_888 || image.getFormat() == YUV_422_888 || image.getFormat() == YUV_444_888) {
32 | ByteBuffer byteBuffer = image.getPlanes()[0].getBuffer();
33 | byte[] imageData = new byte[byteBuffer.capacity()];
34 | byteBuffer.get(imageData);
35 |
36 | PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(
37 | imageData,
38 | image.getWidth(), image.getHeight(),
39 | 0, 0,
40 | image.getWidth(), image.getHeight(),
41 | false
42 | );
43 |
44 | BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(source));
45 |
46 | try {
47 | Result result = new QRCodeMultiReader().decode(binaryBitmap);
48 | listener.onQRCodeFound(result.getText());
49 | } catch (FormatException | ChecksumException | NotFoundException e) {
50 | listener.qrCodeNotFound();
51 | }
52 | }
53 |
54 | image.close();
55 | }
56 | }
57 |
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