Basic QR Code Reader

app/build.gradle

@@ -167,6 +167,14 @@ dependencies {
     implementation "androidx.compose.material3:material3:1.3.2"
     implementation "com.squareup.moshi:moshi:1.15.2"
     implementation "com.squareup.moshi:moshi-adapters:1.15.2"
+
+    def camerax_version = "1.3.2"
+    implementation "androidx.camera:camera-core:$camerax_version"
+    implementation "androidx.camera:camera-camera2:$camerax_version"
+    implementation "androidx.camera:camera-lifecycle:$camerax_version"
+    implementation "androidx.camera:camera-view:$camerax_version"
+
+    implementation 'com.google.zxing:core:3.5.3'
 }
 
 configurations.implementation {

app/src/main/AndroidManifest.xml

@@ -18,6 +18,8 @@
     <uses-permission
         android:name="android.permission.READ_PRECISE_PHONE_STATE"
         tools:ignore="ProtectedPermissions" />
+    <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-feature android:name="android.hardware.camera" android:required="true"/>
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

app/src/main/java/de/fraunhofer/fokus/OpenMobileNetworkToolkit/Preferences/SharedPreferencesIOFragment.java

@@ -24,6 +24,7 @@
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
+import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.ScrollView;
@@ -35,6 +36,8 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
+import androidx.navigation.NavController;
+import androidx.navigation.fragment.NavHostFragment;
 
 import java.io.BufferedReader;
 import java.io.File;
@@ -48,6 +51,7 @@
 import de.fraunhofer.fokus.OpenMobileNetworkToolkit.ClearPreferencesFragment;
 import de.fraunhofer.fokus.OpenMobileNetworkToolkit.MultiSelectDialogFragment;
 import de.fraunhofer.fokus.OpenMobileNetworkToolkit.R;
+import de.fraunhofer.fokus.OpenMobileNetworkToolkit.ScannerFragment;
 import de.fraunhofer.fokus.OpenMobileNetworkToolkit.SettingPreferences.ClearPreferencesListener;
 
 import org.json.JSONObject;
@@ -59,6 +63,7 @@ public class SharedPreferencesIOFragment extends Fragment implements ClearPrefer
     private Uri uri;
     private LinearLayout mainLayout;
     private ScrollView scrollView;
+    private ImageButton qrButton;
 
     private final ActivityResultLauncher<Intent> exportPreferencesLauncher = registerForActivityResult(
             new ActivityResultContracts.StartActivityForResult(), result -> {
@@ -109,6 +114,19 @@ public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup c
         return view;
     }
 
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+        getParentFragmentManager().setFragmentResultListener("qr_scan_request", this, (requestKey, bundle) -> {
+            String scannedText = bundle.getString("scanned_qr");
+            if (scannedText != null) {
+                Log.d("OriginalFragment", "Got scanned QR: " + scannedText);
+                clearConfig();
+                importPreferenceFromText(scannedText);
+            }
+        });
+    }
+
     private void clearConfig() {
         ClearPreferencesFragment fragment = new ClearPreferencesFragment();
         fragment.setClearPreferencesListener(this);
@@ -117,6 +135,16 @@ private void clearConfig() {
 
 
     private void setupUI(View view) {
+
+        qrButton = view.findViewById(R.id.fragment_shared_preferences_io_button_scan_qr_code);
+        qrButton.setOnClickListener(v -> {
+            NavController navController = NavHostFragment.findNavController(this);
+            navController.navigate(R.id.fragment_scanner);
+
+        });
+
+
+
         mainLayout = view.findViewById(R.id.fragment_shared_preferences_io);
 
         Button exportButton = createButton("Export Config", v -> createFile());
@@ -209,7 +237,16 @@ private List<String> getKeysFromJson(String jsonString) {
         return keys;
     }
 
-
+    private void importPreferenceFromText(String jsonString) {
+        try {
+            List<String> keys = getKeysFromJson(jsonString);
+            MultiSelectDialogFragment dialogFragment = getMultiSelectDialogFragment(jsonString, keys);
+            dialogFragment.show(getParentFragmentManager(), "multiSelectDialog");
+        } catch (Exception e) {
+            Log.e(TAG, "Failed to import Config", e);
+            showToast("Failed to import Config");
+        }
+    }
     private void importPreferencesFromFile(Uri uri) {
         try (BufferedReader reader = new BufferedReader(new InputStreamReader(context.getContentResolver().openInputStream(uri)))) {
             StringBuilder stringBuilder = new StringBuilder();

app/src/main/java/de/fraunhofer/fokus/OpenMobileNetworkToolkit/ScannerFragment.java

@@ -0,0 +1,179 @@
+/*
+ * SPDX-FileCopyrightText:  2025 Peter Hasse <peter.hasse@fokus.fraunhofer.de>
+ * SPDX-FileCopyrightText: 2025 Johann Hackler <johann.hackler@fokus.fraunhofer.de>
+ * SPDX-FileCopyrightText: 2025 Fraunhofer FOKUS
+ *
+ *  SPDX-License-Identifier: BSD-3-Clause-Clear
+ */
+
+package de.fraunhofer.fokus.OpenMobileNetworkToolkit;
+
+import android.Manifest;
+import android.annotation.SuppressLint;
+import android.content.pm.PackageManager;
+import android.graphics.ImageFormat;
+import android.media.Image;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Toast;
+
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.camera.core.CameraSelector;
+import androidx.camera.core.ImageAnalysis;
+import androidx.camera.core.Preview;
+import androidx.camera.lifecycle.ProcessCameraProvider;
+import androidx.camera.view.PreviewView;
+import androidx.core.content.ContextCompat;
+import androidx.fragment.app.Fragment;
+import androidx.navigation.NavController;
+import androidx.navigation.fragment.NavHostFragment;
+
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.BinaryBitmap;
+import com.google.zxing.DecodeHintType;
+import com.google.zxing.MultiFormatReader;
+import com.google.zxing.NotFoundException;
+import com.google.zxing.PlanarYUVLuminanceSource;
+import com.google.zxing.Result;
+import com.google.zxing.common.HybridBinarizer;
+
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import java.util.EnumMap;
+import java.util.Map;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+
+public class ScannerFragment extends Fragment {
+
+    private PreviewView previewView;
+    private Executor cameraExecutor;
+    private MultiFormatReader barcodeReader;
+    private static final int CAMERA_PERMISSION_REQUEST_CODE = 1001;
+    private ActivityResultLauncher<String> requestPermissionLauncher;
+
+    @Override
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.fragment_scanner, container, false);
+        previewView = view.findViewById(R.id.previewView);
+        cameraExecutor = Executors.newSingleThreadExecutor();
+        setupBarcodeReader();
+
+
+        requestPermissionLauncher = registerForActivityResult(
+                new ActivityResultContracts.RequestPermission(),
+                isGranted -> {
+                    if (isGranted) {
+                        Log.d("ScannerFragment", "Camera permission granted. Starting camera...");
+                        startCamera();
+                    } else {
+                        Log.e("ScannerFragment", "Camera permission denied.");
+                        Toast.makeText(getContext(), "Camera permission is required to scan QR codes.", Toast.LENGTH_LONG).show();
+                    }
+        });
+
+
+        if (ContextCompat.checkSelfPermission(requireContext(), Manifest.permission.CAMERA)
+                == PackageManager.PERMISSION_GRANTED) {
+            startCamera();
+        } else {
+            requestPermissionLauncher.launch(Manifest.permission.CAMERA);
+        }
+
+        return view;
+    }
+
+    private void setupBarcodeReader() {
+        barcodeReader = new MultiFormatReader();
+        Map<DecodeHintType, Object> hints = new EnumMap<>(DecodeHintType.class);
+        hints.put(DecodeHintType.POSSIBLE_FORMATS,
+                Arrays.asList(BarcodeFormat.QR_CODE, BarcodeFormat.EAN_13, BarcodeFormat.CODE_128));
+        barcodeReader.setHints(hints);
+    }
+
+    private void startCamera() {
+
+        ListenableFuture<ProcessCameraProvider> cameraProviderFuture =
+                ProcessCameraProvider.getInstance(requireContext());
+
+        cameraProviderFuture.addListener(() -> {
+            try {
+                ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
+
+                Preview preview = new Preview.Builder().build();
+                preview.setSurfaceProvider(previewView.getSurfaceProvider());
+
+                ImageAnalysis imageAnalysis = new ImageAnalysis.Builder()
+                        .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
+                        .build();
+
+                imageAnalysis.setAnalyzer(cameraExecutor, image -> {
+                    if (image.getFormat() == ImageFormat.YUV_420_888) {
+                        @SuppressLint("UnsafeOptInUsageError")
+                        Image mediaImage = image.getImage();
+                        if (mediaImage != null) {
+                            int width = mediaImage.getWidth();
+                            int height = mediaImage.getHeight();
+                            ByteBuffer buffer = image.getPlanes()[0].getBuffer();
+                            byte[] data = new byte[buffer.remaining()];
+                            buffer.get(data);
+
+                            PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(
+                                    data, width, height,
+                                    0, 0, width, height,
+                                    false
+                            );
+
+                            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
+
+                            try {
+                                Result result = barcodeReader.decode(bitmap);
+                                Log.d("ZXing", "Scanned: " + result.getText());
+
+                                requireActivity().runOnUiThread(() -> {
+                                    Bundle bundleResult = new Bundle();
+                                    bundleResult.putString("scanned_qr", result.getText());
+                                    getParentFragmentManager().setFragmentResult("qr_scan_request", bundleResult);
+                                    NavHostFragment.findNavController(this).popBackStack();
+                                });
+
+                            } catch (NotFoundException e) {
+                                // No QR code found, ignore
+                            } finally {
+                                image.close();
+                            }
+                        } else {
+                            image.close();
+                        }
+                    } else {
+                        image.close();
+                    }
+                });
+
+
+                CameraSelector cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA;
+
+                cameraProvider.unbindAll();
+                cameraProvider.bindToLifecycle(this, cameraSelector, preview, imageAnalysis);
+
+            } catch (ExecutionException | InterruptedException e) {
+                e.printStackTrace();
+            }
+
+        }, ContextCompat.getMainExecutor(requireContext()));
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+    }
+}

app/src/main/res/drawable/qr_code_scanner_24.xml

@@ -0,0 +1,5 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:tint="#5B70E0" android:viewportHeight="24" android:viewportWidth="24" android:width="24dp">
+
+    <path android:fillColor="@android:color/white" android:pathData="M9.5,6.5v3h-3v-3H9.5M11,5H5v6h6V5L11,5zM9.5,14.5v3h-3v-3H9.5M11,13H5v6h6V13L11,13zM17.5,6.5v3h-3v-3H17.5M19,5h-6v6h6V5L19,5zM13,13h1.5v1.5H13V13zM14.5,14.5H16V16h-1.5V14.5zM16,13h1.5v1.5H16V13zM13,16h1.5v1.5H13V16zM14.5,17.5H16V19h-1.5V17.5zM16,16h1.5v1.5H16V16zM17.5,14.5H19V16h-1.5V14.5zM17.5,17.5H19V19h-1.5V17.5zM22,7h-2V4h-3V2h5V7zM22,22v-5h-2v3h-3v2H22zM2,22h5v-2H4v-3H2V22zM2,2v5h2V4h3V2H2z"/>
+
+</vector>

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

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ SPDX-FileCopyrightText:  2025 Peter Hasse <peter.hasse@fokus.fraunhofer.de>
+  ~ SPDX-FileCopyrightText: 2025 Johann Hackler <johann.hackler@fokus.fraunhofer.de>
+  ~ SPDX-FileCopyrightText: 2025 Fraunhofer FOKUS
+  ~
+  ~  SPDX-License-Identifier: BSD-3-Clause-Clear
+  -->
+
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:id="@+id/fragment_scanner"
+    android:layout_height="match_parent">
+    <androidx.camera.view.PreviewView
+        android:id="@+id/previewView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -5,6 +5,16 @@
     android:orientation="vertical"
     android:id="@+id/fragment_shared_preferences_io"
     android:padding="16dp">
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+        <ImageButton
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:id="@+id/fragment_shared_preferences_io_button_scan_qr_code"
+            android:src="@drawable/qr_code_scanner_24">
+        </ImageButton>
+    </LinearLayout>
 
 
 </LinearLayout>

app/src/main/res/navigation/nav_graph.xml

@@ -55,7 +55,13 @@
             app:destination="@id/workProfileActivity" />
 
     </fragment>
+    <fragment
+        android:id="@+id/fragment_scanner"
+        android:label="ScannerFragment"
+        android:name="de.fraunhofer.fokus.OpenMobileNetworkToolkit.ScannerFragment"
+        tools:layout="@layout/fragment_scanner">
 
+    </fragment>
     <fragment
         android:id="@+id/about_fragment"
         android:name="de.fraunhofer.fokus.OpenMobileNetworkToolkit.AboutFragment"