Added zim scheme deep link support.

* Refactored code to retrieve the ZIM file from `LibkiwixBookOnDisk` instead of `NewBookDao`, since `NewBookDao` no longer exists and books are now stored in `Libkiwix`.
* Added a UI test case for this deep link to verify correct behavior.
* Added `testZimHostDeepLink` to specifically test the new compose deep link and help prevent future regressions.

app/src/androidTest/java/org/kiwix/kiwixmobile/deeplinks/DeepLinkRobot.kt

@@ -0,0 +1,71 @@
+/*
+ * Kiwix Android
+ * Copyright (c) 2025 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.deeplinks
+
+import androidx.compose.ui.test.assertTextEquals
+import androidx.compose.ui.test.junit4.ComposeContentTestRule
+import androidx.compose.ui.test.onNodeWithTag
+import androidx.test.espresso.web.sugar.Web.onWebView
+import androidx.test.espresso.web.webdriver.DriverAtoms.findElement
+import androidx.test.espresso.web.webdriver.Locator
+import applyWithViewHierarchyPrinting
+import org.kiwix.kiwixmobile.BaseRobot
+import org.kiwix.kiwixmobile.core.R
+import org.kiwix.kiwixmobile.core.main.reader.READER_SCREEN_TESTING_TAG
+import org.kiwix.kiwixmobile.core.ui.components.TOOLBAR_TITLE_TESTING_TAG
+import org.kiwix.kiwixmobile.testutils.TestUtils.testFlakyView
+
+fun deepLink(func: DeepLinkRobot.() -> Unit) =
+  DeepLinkRobot().applyWithViewHierarchyPrinting(func)
+
+class DeepLinkRobot : BaseRobot() {
+  fun checkZimFileLoadedSuccessful(composeTestRule: ComposeContentTestRule) {
+    testFlakyView({
+      composeTestRule.apply {
+        waitForIdle()
+        onNodeWithTag(READER_SCREEN_TESTING_TAG).assertExists()
+      }
+    })
+  }
+
+  fun assertZimFilePageLoaded(composeTestRule: ComposeContentTestRule) {
+    testFlakyView({
+      composeTestRule.apply {
+        waitForIdle()
+        onWebView()
+          .withElement(
+            findElement(
+              Locator.XPATH,
+              "//*[contains(text(), 'History')]"
+            )
+          )
+      }
+    })
+  }
+
+  fun checkZimHostScreenVisible(composeTestRule: ComposeContentTestRule) {
+    testFlakyView({
+      composeTestRule.apply {
+        waitForIdle()
+        onNodeWithTag(TOOLBAR_TITLE_TESTING_TAG)
+          .assertTextEquals(context.getString(R.string.menu_wifi_hotspot))
+      }
+    })
+  }
+}

app/src/androidTest/java/org/kiwix/kiwixmobile/deeplinks/DeepLinksTest.kt

@@ -27,6 +27,8 @@ import androidx.compose.ui.test.junit4.createComposeRule
 import androidx.compose.ui.test.onNodeWithTag
 import androidx.compose.ui.test.performClick
 import androidx.core.content.FileProvider
+import androidx.core.net.toUri
+import androidx.lifecycle.Lifecycle
 import androidx.test.core.app.ActivityScenario
 import androidx.test.espresso.accessibility.AccessibilityChecks
 import androidx.test.espresso.matcher.ViewMatchers.withContentDescription
@@ -44,16 +46,21 @@ import org.junit.Rule
 import org.junit.Test
 import org.junit.jupiter.api.fail
 import org.kiwix.kiwixmobile.BaseActivityTest
+import org.kiwix.kiwixmobile.core.main.ZIM_HOST_NAV_DEEP_LINK
+import org.kiwix.kiwixmobile.core.utils.LanguageUtils.Companion.handleLocaleChange
 import org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil
 import org.kiwix.kiwixmobile.core.utils.TestingUtils.COMPOSE_TEST_RULE_ORDER
 import org.kiwix.kiwixmobile.core.utils.TestingUtils.RETRY_RULE_ORDER
 import org.kiwix.kiwixmobile.core.utils.dialog.ALERT_DIALOG_CONFIRM_BUTTON_TESTING_TAG
 import org.kiwix.kiwixmobile.main.KiwixMainActivity
+import org.kiwix.kiwixmobile.main.OPENING_ZIM_FILE_DELAY
+import org.kiwix.kiwixmobile.nav.destination.library.library
 import org.kiwix.kiwixmobile.page.history.navigationHistory
 import org.kiwix.kiwixmobile.testutils.RetryRule
 import org.kiwix.kiwixmobile.testutils.TestUtils
 import org.kiwix.kiwixmobile.testutils.TestUtils.TEST_PAUSE_MS_FOR_DOWNLOAD_TEST
 import org.kiwix.kiwixmobile.testutils.TestUtils.testFlakyView
+import org.kiwix.kiwixmobile.ui.KiwixDestination
 import java.io.File
 import java.io.FileOutputStream
 import java.io.OutputStream
@@ -108,7 +115,9 @@ class DeepLinksTest : BaseActivityTest() {
   fun fileTypeDeepLinkTest() {
     loadZimFileInApplicationAndReturnSchemeTypeUri("file")?.let {
       // Launch the activity to test the deep link
-      ActivityScenario.launch<KiwixMainActivity>(createDeepLinkIntent(it)).onActivity {}
+      ActivityScenario.launch<KiwixMainActivity>(
+        createDeepLinkIntent(it, "application/octet-stream")
+      ).onActivity {}
       clickOnCopy(composeTestRule)
       navigationHistory {
         checkZimFileLoadedSuccessful(composeTestRule)
@@ -138,7 +147,9 @@ class DeepLinksTest : BaseActivityTest() {
   fun contentTypeDeepLinkTest() {
     loadZimFileInApplicationAndReturnSchemeTypeUri("content")?.let {
       // Launch the activity to test the deep link
-      ActivityScenario.launch<KiwixMainActivity>(createDeepLinkIntent(it)).onActivity {}
+      ActivityScenario.launch<KiwixMainActivity>(
+        createDeepLinkIntent(it, "application/octet-stream")
+      ).onActivity {}
       clickOnCopy(composeTestRule)
       navigationHistory {
         checkZimFileLoadedSuccessful(composeTestRule)
@@ -151,6 +162,60 @@ class DeepLinksTest : BaseActivityTest() {
     }
   }
 
+  @Test
+  fun zimUrlTypeDeepLinkTest() {
+    activityScenario =
+      ActivityScenario.launch(KiwixMainActivity::class.java).apply {
+        moveToState(Lifecycle.State.RESUMED)
+        onActivity {
+          handleLocaleChange(
+            it,
+            "en",
+            SharedPreferenceUtil(context)
+          )
+        }
+      }
+    activityScenario.onActivity {
+      it.navigate(KiwixDestination.Library.route)
+    }
+    library {
+      refreshList(composeTestRule)
+      waitUntilZimFilesRefreshing(composeTestRule)
+      deleteZimIfExists(composeTestRule)
+    }
+    loadZimFileInApplicationAndReturnSchemeTypeUri("file")
+    library {
+      refreshList(composeTestRule)
+      waitUntilZimFilesRefreshing(composeTestRule)
+    }
+    // it tests the zim deep link e.g. (zim://60094d1e-1c9a-a60b-2011-4fb02f8db6c3/A/Android_(operating_system).html)
+    ActivityScenario.launch<KiwixMainActivity>(
+      createDeepLinkIntent("zim://60094d1e-1c9a-a60b-2011-4fb02f8db6c3/A/Android_(operating_system).html".toUri())
+    ).onActivity {}
+    // for a bit to properly handle the deep link.
+    composeTestRule.mainClock.advanceTimeBy(OPENING_ZIM_FILE_DELAY + 500)
+    composeTestRule.waitForIdle()
+    deepLink {
+      checkZimFileLoadedSuccessful(composeTestRule)
+      assertZimFilePageLoaded(composeTestRule)
+    }
+  }
+
+  @Test
+  fun testZimHostDeepLink() {
+    // For testing the deep link triggers when user click on notification of the hotspot.
+    // it should open the WIFI-Hotspot screen.
+    ActivityScenario.launch<KiwixMainActivity>(
+      createDeepLinkIntent(ZIM_HOST_NAV_DEEP_LINK.toUri())
+    ).onActivity {}
+    // for a bit to properly handle the deep link.
+    composeTestRule.mainClock.advanceTimeBy(OPENING_ZIM_FILE_DELAY + 500)
+    composeTestRule.waitForIdle()
+    deepLink {
+      checkZimHostScreenVisible(composeTestRule)
+    }
+  }
+
   private fun loadZimFileInApplicationAndReturnSchemeTypeUri(schemeType: String): Uri? {
     val loadFileStream =
       DeepLinksTest::class.java.classLoader.getResourceAsStream("testzim.zim")
@@ -180,14 +245,16 @@ class DeepLinksTest : BaseActivityTest() {
     }
   }
 
-  private fun createDeepLinkIntent(uri: Uri): Intent {
-    val intent =
-      Intent(Intent.ACTION_VIEW).apply {
-        setDataAndType(uri, "application/octet-stream")
-        addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-        setPackage(context.packageName)
-      }
-    return intent
+  private fun createDeepLinkIntent(
+    uri: Uri,
+    mimeType: String? = null
+  ): Intent {
+    return Intent(Intent.ACTION_VIEW).apply {
+      data = uri
+      mimeType?.let { setDataAndType(uri, it) }
+      addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+      setPackage(context.packageName)
+    }
   }
 
   @After

app/src/main/AndroidManifest.xml

@@ -141,6 +141,14 @@
         <category android:name="android.intent.category.BROWSABLE" />
         <data android:scheme="kiwix" android:host="zimhost" />
       </intent-filter>
+      <intent-filter>
+        <action android:name="android.intent.action.VIEW" />
+
+        <category android:name="android.intent.category.DEFAULT" />
+        <category android:name="android.intent.category.BROWSABLE" />
+
+        <data android:scheme="zim" />
+      </intent-filter>
     </activity>
 
     <receiver

app/src/main/java/org/kiwix/kiwixmobile/main/KiwixMainActivity.kt

@@ -83,6 +83,7 @@ import org.kiwix.kiwixmobile.core.main.PAGE_URL_KEY
 import org.kiwix.kiwixmobile.core.main.SHOULD_OPEN_IN_NEW_TAB
 import org.kiwix.kiwixmobile.core.main.ZIM_FILE_URI_KEY
 import org.kiwix.kiwixmobile.core.main.ZIM_HOST_DEEP_LINK_SCHEME
+import org.kiwix.kiwixmobile.core.reader.ZimFileReader.Companion.CONTENT_PREFIX
 import org.kiwix.kiwixmobile.core.reader.ZimReaderSource
 import org.kiwix.kiwixmobile.core.utils.LanguageUtils.Companion.handleLocaleChange
 import org.kiwix.kiwixmobile.core.utils.dialog.DialogHost
@@ -309,6 +310,21 @@ class KiwixMainActivity : CoreMainActivity() {
           }, OPENING_ZIM_FILE_DELAY)
         }
 
+        "zim" -> {
+          val zimId = it.host
+          val page = it.encodedPath?.removePrefix("/")
+          if (zimId.isNullOrEmpty() || page.isNullOrEmpty()) {
+            return toast(R.string.cannot_open_file)
+          }
+          lifecycleScope.launch {
+            delay(OPENING_ZIM_FILE_DELAY)
+            val book = libkiwixBookOnDisk.bookById(zimId)
+              ?: return@launch toast(R.string.cannot_open_file)
+            openPage("$CONTENT_PREFIX$page", book.zimReaderSource)
+            clearIntentDataAndAction()
+          }
+        }
+
         else -> {
           if (it.scheme != ZIM_HOST_DEEP_LINK_SCHEME) {
             toast(R.string.cannot_open_file)

core/src/main/java/org/kiwix/kiwixmobile/core/dao/LibkiwixBookOnDisk.kt

@@ -228,6 +228,9 @@ class LibkiwixBookOnDisk @Inject constructor(
       it.zimReaderSource.toDatabase().endsWith(downloadTitle, true)
     }
 
+  suspend fun bookById(bookId: String) =
+    getBooks().firstOrNull { it.book.id == bookId }
+
   /**
    * Asynchronously writes the library data to their respective file in a background thread
    * to prevent potential data loss and ensures that the library holds the updated ZIM file data.

core/src/main/java/org/kiwix/kiwixmobile/core/main/reader/CoreReaderFragment.kt

@@ -1869,7 +1869,7 @@ abstract class CoreReaderFragment :
   }
 
   private fun startIntentBasedOnAction(intent: Intent?) {
-    Log.d(TAG_KIWIX, "action" + requireActivity().intent?.action)
+    Log.d(TAG_KIWIX, "action: ${requireActivity().intent?.action}")
     when (intent?.action) {
       Intent.ACTION_PROCESS_TEXT -> {
         goToSearchWithText(intent)
@@ -1903,7 +1903,7 @@ abstract class CoreReaderFragment :
           // Added condition to handle ZIM files. When opening from storage, the intent may
           // return null for the type, triggering the search unintentionally. This condition
           // prevents such occurrences.
-          intent.scheme !in listOf("file", "content", ZIM_HOST_DEEP_LINK_SCHEME)
+          intent.scheme !in listOf("file", "content", "zim", ZIM_HOST_DEEP_LINK_SCHEME)
         ) {
           val searchString = if (intent.data == null) "" else intent.data?.lastPathSegment
           openSearch(