#1553 Generate & show QR

README.md

@@ -79,6 +79,7 @@ are interested in our custom apps, they have their own repo
 - [JUnit5](https://github.com/junit-team/junit5/) - The next generation of JUnit
 - [AssertJ](https://github.com/joel-costigliola/assertj-core) - Fluent assertions for test code
 - [Fetch](https://github.com/tonyofrancis/Fetch) - A customizable file download manager library for Android
+- [ZXing](https://github.com/zxing/zxing) - Barcode scanning library for Java, Android
 
 ## Contributing
 

app/src/main/java/org/kiwix/kiwixmobile/qr/ShareByQRCodeDialog.kt

@@ -20,15 +20,32 @@ package org.kiwix.kiwixmobile.qr
 
 import android.app.AlertDialog
 import android.app.Dialog
+import android.net.Uri
 import android.os.Bundle
+import androidx.core.net.toUri
 import androidx.fragment.app.DialogFragment
+import androidx.navigation.fragment.navArgs
 import org.kiwix.kiwixmobile.core.databinding.DialogShareByQrCodeBinding
+import org.kiwix.kiwixmobile.core.qr.GenerateQR
 
 class ShareByQRCodeDialog : DialogFragment() {
+
+  private val args: ShareByQRCodeDialogArgs by navArgs()
+
+  private lateinit var binding: DialogShareByQrCodeBinding
+
   override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
-    val binding = DialogShareByQrCodeBinding.inflate(layoutInflater)
+    binding = DialogShareByQrCodeBinding.inflate(layoutInflater)
+
+    loadQrCode(args.uri.toUri())
+
     return AlertDialog.Builder(requireContext())
       .setView(binding.root)
       .create()
   }
+
+  private fun loadQrCode(uri: Uri) {
+    val qrCode = GenerateQR().createQR(uri)
+    binding.qrCode.setImageBitmap(qrCode)
+  }
 }

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

@@ -160,7 +160,7 @@
     android:name="org.kiwix.kiwixmobile.qr.ShareByQRCodeDialog"
     android:label="ShareByQRCodeFragment"
     tools:layout="@layout/dialog_share_by_qr_code">
-    <deepLink
-      app:uri="kiwix://shareByQr" />
+    <deepLink app:uri="kiwix://shareByQr/{uri}" />
+    <argument android:name="uri" />
   </dialog>
 </navigation>

buildSrc/src/main/kotlin/Libs.kt

@@ -359,4 +359,9 @@ object Libs {
   const val roomRuntime = "androidx.room:room-runtime:" + Versions.roomVersion
 
   const val roomRxjava2 = "androidx.room:room-rxjava2:" + Versions.roomVersion
+
+  /**
+   * https://github.com/zxing/zxing
+   */
+  const val zxing = "com.google.zxing:core:" + Versions.zxing
 }

buildSrc/src/main/kotlin/Versions.kt

@@ -105,6 +105,8 @@ object Versions {
   const val material_show_case_view: String = "1.3.7"
 
   const val roomVersion = "2.5.0"
+
+  const val zxing = "3.5.3"
 }
 
 /**

core/build.gradle.kts

@@ -84,4 +84,7 @@ dependencies {
   implementation(Libs.webkit)
   testImplementation(Libs.kotlinx_coroutines_test)
   implementation(Libs.kotlinx_coroutines_android)
+
+  // ZXing
+  implementation(Libs.zxing)
 }

core/src/main/java/org/kiwix/kiwixmobile/core/qr/GenerateQR.kt

@@ -0,0 +1,48 @@
+/*
+ * Kiwix Android
+ * Copyright (c) 2024 Kiwix <android.kiwix.org>
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package org.kiwix.kiwixmobile.core.qr
+
+import android.graphics.Bitmap
+import android.graphics.Color
+import android.net.Uri
+import com.google.zxing.BarcodeFormat
+import com.google.zxing.EncodeHintType
+import com.google.zxing.qrcode.QRCodeWriter
+
+/**
+ * Utility class to generate QR codes.
+ */
+class GenerateQR {
+  /**
+   * Create a QR code for the given [uri].
+   */
+  fun createQR(uri: Uri, size: Int = 512): Bitmap {
+    val hints = hashMapOf<EncodeHintType, Int>().also {
+      it[EncodeHintType.MARGIN] = 1
+    }
+    val bits = QRCodeWriter().encode("$uri", BarcodeFormat.QR_CODE, size, size, hints)
+    return Bitmap.createBitmap(size, size, Bitmap.Config.RGB_565).also {
+      for (x in 0 until size) {
+        for (y in 0 until size) {
+          it.setPixel(x, y, if (bits[x, y]) Color.BLACK else Color.WHITE)
+        }
+      }
+    }
+  }
+}

core/src/main/java/org/kiwix/kiwixmobile/core/webserver/ZimHostFragment.kt

@@ -392,8 +392,9 @@ class ZimHostFragment : BaseFragment(), ZimHostCallbacks, ZimHostContract.View {
       visibility = View.VISIBLE
       setOnClickListener {
         // Navigate cross-module via deeplink
+        val authority = ip?.toUri()?.encodedAuthority // Need to exclude the scheme
         val request = NavDeepLinkRequest.Builder
-          .fromUri("kiwix://shareByQr".toUri())
+          .fromUri("kiwix://shareByQr/$authority".toUri())
           .build()
         findNavController().navigate(request)
       }