Added the downloadZIMFileInBackground for testing the download when application is in background.

* Removed some unused code from project.

app/src/androidTest/java/org/kiwix/kiwixmobile/download/DownloadRobot.kt

@@ -26,6 +26,7 @@ import androidx.compose.ui.test.junit4.ComposeContentTestRule
 import androidx.compose.ui.test.onAllNodesWithTag
 import androidx.compose.ui.test.onNodeWithTag
 import androidx.compose.ui.test.performClick
+import androidx.compose.ui.test.performTextClearance
 import androidx.compose.ui.test.performTextInput
 import applyWithViewHierarchyPrinting
 import org.kiwix.kiwixmobile.BaseRobot
@@ -57,6 +58,7 @@ fun downloadRobot(func: DownloadRobot.() -> Unit) =
   DownloadRobot().applyWithViewHierarchyPrinting(func)
 
 class DownloadRobot : BaseRobot() {
+  private val searchZIMFileTitle = "Zapping Sauvage"
   fun clickLibraryOnBottomNav(composeTestRule: ComposeContentTestRule) {
     composeTestRule.apply {
       waitUntilTimeout()
@@ -135,6 +137,27 @@ class DownloadRobot : BaseRobot() {
     }
   }
 
+  fun searchZappingSauvageFile(composeTestRule: ComposeContentTestRule) {
+    testFlakyView({
+      composeTestRule.apply {
+        waitForIdle() // let the compose settle.
+        runCatching {
+          // if searchView already opened do nothing.
+          onNodeWithTag(ONLINE_LIBRARY_SEARCH_VIEW_CLOSE_BUTTON_TESTING_TAG).assertExists()
+        }.onFailure {
+          // if searchView is not opened then open it.
+          onNodeWithTag(SEARCH_ICON_TESTING_TAG).performClick()
+        }
+        waitForIdle()
+        onNodeWithTag(ONLINE_LIBRARY_SEARCH_VIEW_TESTING_TAG).apply {
+          performTextClearance()
+          performTextInput(searchZIMFileTitle)
+        }
+        waitUntilTimeout(TestUtils.TEST_PAUSE_MS_FOR_DOWNLOAD_TEST.toLong())
+      }
+    })
+  }
+
   private fun refreshOnlineList(composeTestRule: ComposeContentTestRule) {
     composeTestRule.refresh()
   }

app/src/androidTest/java/org/kiwix/kiwixmobile/download/DownloadTest.kt

@@ -17,6 +17,9 @@
  */
 package org.kiwix.kiwixmobile.download
 
+import android.accessibilityservice.AccessibilityService
+import android.content.Context
+import android.content.Intent
 import android.os.Build
 import android.util.Log
 import androidx.compose.ui.test.junit4.createComposeRule
@@ -24,6 +27,7 @@ import androidx.core.content.edit
 import androidx.lifecycle.Lifecycle
 import androidx.preference.PreferenceManager
 import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ApplicationProvider
 import androidx.test.espresso.IdlingPolicies
 import androidx.test.espresso.IdlingRegistry
 import androidx.test.espresso.accessibility.AccessibilityChecks
@@ -59,10 +63,13 @@ import org.kiwix.kiwixmobile.testutils.RetryRule
 import org.kiwix.kiwixmobile.testutils.TestUtils
 import org.kiwix.kiwixmobile.testutils.TestUtils.closeSystemDialogs
 import org.kiwix.kiwixmobile.testutils.TestUtils.isSystemUINotRespondingDialogVisible
+import org.kiwix.kiwixmobile.testutils.TestUtils.waitUntilTimeout
 import org.kiwix.kiwixmobile.ui.KiwixDestination
 import org.kiwix.kiwixmobile.utils.KiwixIdlingResource.Companion.getInstance
 import java.util.concurrent.TimeUnit
 
+const val TWO_MINUTES_IN_MILLISECONDS = 2 * 60 * 1000
+
 @LargeTest
 class DownloadTest : BaseActivityTest() {
   @Rule(order = RETRY_RULE_ORDER)
@@ -233,6 +240,52 @@ class DownloadTest : BaseActivityTest() {
     }
   }
 
+  @Test
+  fun downloadZIMFileInBackground() {
+    activityScenario.onActivity {
+      kiwixMainActivity = it
+      it.navigate(KiwixDestination.Library.route)
+    }
+    // delete all the ZIM files showing in the LocalLibrary
+    // screen to properly test the scenario.
+    library {
+      refreshList(composeTestRule)
+      waitUntilZimFilesRefreshing(composeTestRule)
+      deleteZimIfExists(composeTestRule)
+    }
+    downloadRobot {
+      clickDownloadOnBottomNav(composeTestRule)
+      waitForDataToLoad(composeTestRule = composeTestRule)
+      stopDownloadIfAlreadyStarted(composeTestRule)
+      searchZappingSauvageFile(composeTestRule)
+      downloadZimFile(composeTestRule)
+      assertDownloadStart(composeTestRule)
+    }
+    // press the home button so that application goes into background
+    InstrumentationRegistry.getInstrumentation().uiAutomation.performGlobalAction(
+      AccessibilityService.GLOBAL_ACTION_HOME
+    )
+    // wait for 2 minutes to download the ZIM file in background.
+    composeTestRule.waitUntilTimeout(TWO_MINUTES_IN_MILLISECONDS.toLong())
+    // relaunch the application.
+    val context = ApplicationProvider.getApplicationContext<Context>()
+    val intent = context.packageManager.getLaunchIntentForPackage(context.packageName)
+    intent?.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK)
+    context.startActivity(intent)
+    InstrumentationRegistry.getInstrumentation().waitForIdleSync()
+    activityScenario.onActivity {
+      kiwixMainActivity = it
+      it.navigate(KiwixDestination.Library.route)
+    }
+    library {
+      refreshList(composeTestRule)
+      waitUntilZimFilesRefreshing(composeTestRule)
+      downloadRobot {
+        checkIfZimFileDownloaded(composeTestRule)
+      }
+    }
+  }
+
   @After
   fun finish() {
     IdlingRegistry.getInstance().unregister(getInstance())

app/src/main/java/org/kiwix/kiwixmobile/nav/destination/library/local/LocalLibraryFragment.kt

@@ -144,8 +144,7 @@ class LocalLibraryFragment : BaseFragment(), CopyMoveFileHandler.FileCopyMoveCal
       swipeRefreshItem = Pair(false, true),
       scanningProgressItem = Pair(false, ZERO),
       noFilesViewItem = Triple("", "", false),
-      actionMenuItems = listOf(),
-      bottomNavigationHeight = ZERO
+      actionMenuItems = listOf()
     )
   )
 
@@ -187,10 +186,7 @@ class LocalLibraryFragment : BaseFragment(), CopyMoveFileHandler.FileCopyMoveCal
       setContent {
         val lazyListState = rememberLazyListState()
         LaunchedEffect(Unit) {
-          updateLibraryScreenState(
-            bottomNavigationHeight = getBottomNavigationHeight(),
-            actionMenuItems = actionMenuItems()
-          )
+          updateLibraryScreenState(actionMenuItems = actionMenuItems())
         }
         LocalLibraryScreen(
           listState = lazyListState,
@@ -266,8 +262,7 @@ class LocalLibraryFragment : BaseFragment(), CopyMoveFileHandler.FileCopyMoveCal
     swipeRefreshItem: Pair<Boolean, Boolean>? = null,
     scanningProgressItem: Pair<Boolean, Int>? = null,
     noFilesViewItem: Triple<String, String, Boolean>? = null,
-    actionMenuItems: List<ActionMenuItem>? = null,
-    bottomNavigationHeight: Int? = null
+    actionMenuItems: List<ActionMenuItem>? = null
   ) {
     libraryScreenState.value = libraryScreenState.value.copy(
       fileSelectListState = fileSelectListState ?: libraryScreenState.value.fileSelectListState,
@@ -276,9 +271,7 @@ class LocalLibraryFragment : BaseFragment(), CopyMoveFileHandler.FileCopyMoveCal
       scanningProgressItem = scanningProgressItem
         ?: libraryScreenState.value.scanningProgressItem,
       noFilesViewItem = noFilesViewItem ?: libraryScreenState.value.noFilesViewItem,
-      actionMenuItems = actionMenuItems ?: libraryScreenState.value.actionMenuItems,
-      bottomNavigationHeight = bottomNavigationHeight
-        ?: libraryScreenState.value.bottomNavigationHeight
+      actionMenuItems = actionMenuItems ?: libraryScreenState.value.actionMenuItems
     )
   }
 
@@ -363,12 +356,6 @@ class LocalLibraryFragment : BaseFragment(), CopyMoveFileHandler.FileCopyMoveCal
     }
   }
 
-  // private fun getBottomNavigationView() =
-  //   requireActivity().findViewById<BottomNavigationView>(R.id.bottom_nav_view)
-
-  private fun getBottomNavigationHeight() = ZERO
-  // getBottomNavigationView().measuredHeight
-
   private fun filePickerButtonClick() {
     if (!requireActivity().isManageExternalStoragePermissionGranted(sharedPreferenceUtil)) {
       showManageExternalStoragePermissionDialog()

app/src/main/java/org/kiwix/kiwixmobile/nav/destination/library/local/LocalLibraryScreenState.kt

@@ -65,9 +65,5 @@ data class LocalLibraryScreenState(
   /**
    * Represents a list of action menu items available in the screen's top app bar.
    */
-  val actionMenuItems: List<ActionMenuItem>,
-  /**
-   * Stores the height of the bottom navigation bar in pixels.
-   */
-  val bottomNavigationHeight: Int
+  val actionMenuItems: List<ActionMenuItem>
 )

app/src/main/java/org/kiwix/kiwixmobile/nav/destination/library/online/OnlineBookItem.kt

@@ -206,7 +206,9 @@ private fun BookSizeAndDateRow(item: BookItem) {
   ) {
     BookSize(
       Byte(item.book.size).humanReadable,
-      modifier = Modifier.weight(1f).testTag(ONLINE_BOOK_SIZE_TEXT_TESTING_TAG)
+      modifier = Modifier
+        .weight(1f)
+        .testTag(ONLINE_BOOK_SIZE_TEXT_TESTING_TAG)
     )
     BookDate(item.book.date)
   }

app/src/main/java/org/kiwix/kiwixmobile/nav/destination/library/online/OnlineLibraryFragment.kt

@@ -58,7 +58,6 @@ import org.kiwix.kiwixmobile.core.base.BaseFragment
 import org.kiwix.kiwixmobile.core.base.FragmentActivityExtensions
 import org.kiwix.kiwixmobile.core.data.remote.KiwixService.Companion.ITEMS_PER_PAGE
 import org.kiwix.kiwixmobile.core.downloader.Downloader
-import org.kiwix.kiwixmobile.core.downloader.downloadManager.ZERO
 import org.kiwix.kiwixmobile.core.extensions.ActivityExtensions.hasNotificationPermission
 import org.kiwix.kiwixmobile.core.extensions.ActivityExtensions.isManageExternalStoragePermissionGranted
 import org.kiwix.kiwixmobile.core.extensions.ActivityExtensions.navigate
@@ -129,7 +128,6 @@ class OnlineLibraryFragment : BaseFragment(), FragmentActivityExtensions {
         isRefreshing = false,
         scanningProgressItem = Pair(false, ""),
         noContentViewItem = Pair("", false),
-        bottomNavigationHeight = ZERO,
         onBookItemClick = { onBookItemClick(it) },
         availableSpaceCalculator = availableSpaceCalculator,
         onRefresh = { refreshFragment(true) },
@@ -209,12 +207,6 @@ class OnlineLibraryFragment : BaseFragment(), FragmentActivityExtensions {
     composeView = it
   }
 
-  // private fun getBottomNavigationView() =
-  //   requireActivity().findViewById<BottomNavigationView>(org.kiwix.kiwixmobile.R.id.bottom_nav_view)
-
-  private fun getBottomNavigationHeight() = ZERO
-  // getBottomNavigationView().measuredHeight
-
   private fun onPauseResumeButtonClick(item: LibraryListItem.LibraryDownloadItem) {
     context?.let { context ->
       if (isNotConnected) {
@@ -251,7 +243,6 @@ class OnlineLibraryFragment : BaseFragment(), FragmentActivityExtensions {
       LaunchedEffect(Unit) {
         onlineLibraryScreenState.value.update {
           copy(
-            bottomNavigationHeight = getBottomNavigationHeight(),
             isSearchActive = isSearchActive,
             scanningProgressItem = false to getString(R.string.reaching_remote_library)
           )

app/src/main/java/org/kiwix/kiwixmobile/nav/destination/library/online/OnlineLibraryScreenState.kt

@@ -30,10 +30,6 @@ data class OnlineLibraryScreenState(
    * Manages the online library list state.
    */
   val onlineLibraryList: List<LibraryListItem>?,
-  /**
-   * Stores the height of the bottom navigation bar in pixels.
-   */
-  val bottomNavigationHeight: Int,
   /**
    * Controls the visibility and behavior of the "Pull to refresh" animation.
    *

core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreMainActivity.kt

@@ -60,7 +60,6 @@ import org.kiwix.kiwixmobile.core.reader.ZimReaderSource
 import org.kiwix.kiwixmobile.core.utils.ExternalLinkOpener
 import org.kiwix.kiwixmobile.core.utils.dialog.AlertDialogShower
 import org.kiwix.kiwixmobile.core.utils.dialog.RateDialogHandler
-import org.kiwix.kiwixmobile.core.utils.files.Log
 import javax.inject.Inject
 import kotlin.system.exitProcess
 
@@ -351,9 +350,7 @@ abstract class CoreMainActivity : BaseActivity(), WebViewProvider {
   }
 
   private fun activeFragments(): MutableList<Fragment> =
-    supportFragmentManager.fragments.also {
-      Log.d("Fragments", "Found fragments: ${supportFragmentManager.fragments}")
-    }
+    supportFragmentManager.fragments
 
   fun navigate(action: NavDirections) {
     navController.currentDestination?.getAction(action.actionId)?.run {