Minimum SDK version changed to 24: The NDK version in kiwix-build has been upgraded (as mentioned in https://github.com/kiwix/kiwix-build/issues/544). However, to make this upgrade compatible, the minimum SDK version had to be updated to 24 since the NDK version is not compatible with Android API levels below 24. The README.md file has been updated to reflect the new minimum Android support version, which is now Android 7, due to the change in the minimum SDK version. Since the project's minimum SDK version is now 24, some conditions related to Android 23 and 24 have become unused. These unused conditions have been removed, and along with that, the drawable-night-23 and drawable-23 launch_screen.xml files, which were no longer in use, have also been removed.

README.md

@@ -13,7 +13,7 @@ is to make Wikipedia available offline. This is done by reading the
 content of a file in the ZIM format, a highly compressed open format
 with additional metadata.
 
-This is the version for Android, with support versions ranging from 5
+This is the version for Android, with support versions ranging from 7
 to 13 (like [mentioned
 here](https://github.com/kiwix/kiwix-android/blob/develop/buildSrc/src/main/kotlin/Config.kt)).
 

app/src/main/AndroidManifest.xml

@@ -27,8 +27,7 @@
     android:allowBackup="true"
     android:icon="@mipmap/ic_launcher"
     android:roundIcon="@mipmap/ic_launcher_round"
-    android:supportsRtl="true"
+    android:supportsRtl="true">
-    tools:targetApi="m">
 
     <activity
       android:name=".main.KiwixMainActivity"

app/src/main/java/org/kiwix/kiwixmobile/webserver/wifi_hotspot/HotspotNotificationManager.kt

@@ -63,16 +63,12 @@ class HotspotNotificationManager @Inject constructor(
     val stopIntent = Intent(context, HotspotService::class.java).setAction(
       HotspotService.ACTION_STOP_SERVER
     )
-    val stopHotspot = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+    val stopHotspot = PendingIntent.getService(
-      PendingIntent.getService(
       context,
       0,
       stopIntent,
       PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
     )
-    } else {
-      PendingIntent.getService(context, 0, stopIntent, PendingIntent.FLAG_UPDATE_CURRENT)
-    }
     return NotificationCompat.Builder(context, HOTSPOT_SERVICE_CHANNEL_ID)
       .setContentTitle(context.getString(R.string.hotspot_notification_content_title))
       .setContentText(context.getString(R.string.hotspot_running))

app/src/main/java/org/kiwix/kiwixmobile/webserver/wifi_hotspot/HotspotService.kt

@@ -20,7 +20,6 @@ package org.kiwix.kiwixmobile.webserver.wifi_hotspot
 import android.app.Service
 import android.content.Intent
 import android.os.Binder
-import android.os.Build
 import android.os.IBinder
 import android.widget.Toast
 import org.kiwix.kiwixmobile.KiwixApp
@@ -84,6 +83,7 @@ class HotspotService :
             onServerFailedToStart()
           }
         } ?: kotlin.run(::onServerFailedToStart)
+
       ACTION_STOP_SERVER -> {
         Toast.makeText(
           this, R.string.server_stopped_successfully_toast_message,
@@ -91,6 +91,7 @@ class HotspotService :
         ).show()
         stopHotspotAndDismissNotification()
       }
+
       ACTION_CHECK_IP_ADDRESS -> webServerHelper?.pollForValidIpAddress()
       else -> {}
     }
@@ -103,9 +104,7 @@ class HotspotService :
   private fun stopHotspotAndDismissNotification() {
     webServerHelper?.stopAndroidWebServer()
     zimHostCallbacks?.onServerStopped()
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
     stopForeground(STOP_FOREGROUND_REMOVE)
-    }
     stopSelf()
     hotspotStateReceiver = null
     hotspotNotificationManager?.dismissNotification()

app/src/main/java/org/kiwix/kiwixmobile/zimManager/Fat32Checker.kt

@@ -18,7 +18,6 @@
 package org.kiwix.kiwixmobile.zimManager
 
 import android.annotation.SuppressLint
-import android.os.Build
 import android.os.FileObserver
 import io.reactivex.Flowable
 import io.reactivex.functions.BiFunction
@@ -63,22 +62,12 @@ class Fat32Checker constructor(
       )
   }
 
-  @Suppress("DEPRECATION")
+  private fun fileObserver(it: String): FileObserver =
-  private fun fileObserver(it: String): FileObserver {
+    object : FileObserver(File(it), MOVED_FROM or DELETE) {
-    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-      return object : FileObserver(File(it), MOVED_FROM or DELETE) {
       override fun onEvent(event: Int, path: String?) {
         requestCheckSystemFileType.onNext(Unit)
       }
     }.apply { startWatching() }
-    } else {
-      object : FileObserver(it, FileObserver.MOVED_FROM or FileObserver.DELETE) {
-        override fun onEvent(event: Int, path: String?) {
-          requestCheckSystemFileType.onNext(Unit)
-        }
-      }.apply { startWatching() }
-    }
-  }
 
   private fun toFileSystemState(it: String) =
     when {

buildSrc/src/main/kotlin/Config.kt

@@ -23,7 +23,7 @@ object Config {
   // Here is a list of all Android versions with their corresponding API
   // levels: https://apilevels.com/
   const val compileSdk = 33 // SDK version used by Gradle to compile our app.
-  const val minSdk = 21 // Minimum SDK (Minimum Support Device) is 21 (Android 5.0 Lollipop).
+  const val minSdk = 24 // Minimum SDK (Minimum Support Device) is 24 (Android 7.0 Nougat).
   const val targetSdk = 33 // Target SDK (Maximum Support Device) is 33 (Android 13).
 
   val javaVersion = JavaVersion.VERSION_1_8

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

@@ -22,7 +22,6 @@ import android.app.Dialog
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
-import android.net.Uri
 import android.os.Build
 import android.os.Bundle
 import android.text.Editable
@@ -446,16 +445,12 @@ class AddNoteDialog : DialogFragment() {
     }
     val noteFile = File("$zimNotesDirectory$articleNoteFileName.txt")
     if (noteFile.exists()) {
-      val noteFileUri = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
       // From Nougat 7 (API 24) access to files is shared temporarily with other apps
       // Need to use FileProvider for the same
-        FileProvider.getUriForFile(
+      val noteFileUri = FileProvider.getUriForFile(
         requireContext(), requireContext().packageName + ".fileprovider",
         noteFile
       )
-      } else {
-        Uri.fromFile(noteFile)
-      }
       val noteFileShareIntent = Intent(Intent.ACTION_SEND).apply {
         type = "application/octet-stream"
         putExtra(Intent.EXTRA_STREAM, noteFileUri)

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

@@ -20,7 +20,6 @@ package org.kiwix.kiwixmobile.core.main
 import android.content.Context
 import android.content.Intent
 import android.net.Uri
-import android.os.Build
 import android.util.Log
 import android.webkit.MimeTypeMap
 import android.webkit.WebResourceError
@@ -94,18 +93,15 @@ open class CoreWebViewClient(
       )?.let {
         if (it.exists()) {
           val context: Context = instance
-          val uri = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
+          val uri = FileProvider.getUriForFile(
-            FileProvider.getUriForFile(
             context,
             context.packageName + ".fileprovider", it
-            ) else Uri.fromFile(it)
+          )
           val intent = Intent(Intent.ACTION_VIEW).apply {
             setDataAndType(uri, DOCUMENT_TYPES[extension])
             flags = Intent.FLAG_ACTIVITY_NO_HISTORY
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
             addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
           }
-          }
           callback.openExternalUrl(intent)
         }
       }

core/src/main/java/org/kiwix/kiwixmobile/core/read_aloud/ReadAloudNotificationManger.kt

@@ -57,29 +57,21 @@ class ReadAloudNotificationManger @Inject constructor(
     val stopIntent = Intent(context, ReadAloudService::class.java).setAction(
       ReadAloudService.ACTION_STOP_TTS
     )
-    val stopReadAloud = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+    val stopReadAloud = PendingIntent.getService(
-      PendingIntent.getService(
       context,
       0,
       stopIntent,
       PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
     )
-    } else {
-      PendingIntent.getService(context, 0, stopIntent, PendingIntent.FLAG_UPDATE_CURRENT)
-    }
     val pauseOrResumeIntent = Intent(context, ReadAloudService::class.java).setAction(
       ReadAloudService.ACTION_PAUSE_OR_RESUME_TTS
     ).putExtra(IS_TTS_PAUSE_OR_RESUME, !isPauseTTS)
-    val pauseOrResumeReadAloud = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+    val pauseOrResumeReadAloud = PendingIntent.getService(
-      PendingIntent.getService(
       context,
       0,
       pauseOrResumeIntent,
       PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
     )
-    } else {
-      PendingIntent.getService(context, 0, pauseOrResumeIntent, PendingIntent.FLAG_UPDATE_CURRENT)
-    }
     return NotificationCompat.Builder(context, READ_ALOUD_SERVICE_CHANNEL_ID)
       .setContentTitle(context.getString(R.string.menu_read_aloud))
       .setContentText(context.getString(R.string.read_aloud_running))

core/src/main/java/org/kiwix/kiwixmobile/core/read_aloud/ReadAloudService.kt

@@ -21,7 +21,6 @@ package org.kiwix.kiwixmobile.core.read_aloud
 import android.app.Service
 import android.content.Intent
 import android.os.Binder
-import android.os.Build
 import android.os.IBinder
 import org.kiwix.kiwixmobile.core.CoreApp
 import java.lang.ref.WeakReference
@@ -49,6 +48,7 @@ class ReadAloudService : Service() {
         startForegroundNotificationHelper(isPauseTTS)
         readAloudCallbacks?.onReadAloudPauseOrResume(isPauseTTS)
       }
+
       ACTION_STOP_TTS -> {
         stopReadAloudAndDismissNotification()
       }
@@ -58,9 +58,7 @@ class ReadAloudService : Service() {
 
   private fun stopReadAloudAndDismissNotification() {
     readAloudCallbacks?.onReadAloudStop()
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
     stopForeground(STOP_FOREGROUND_REMOVE)
-    }
     stopSelf()
     readAloudNotificationManager?.dismissNotification()
   }

custom/src/main/AndroidManifest.xml

@@ -8,8 +8,7 @@
     android:name=".CustomApp"
     android:icon="@mipmap/ic_launcher"
     android:roundIcon="@mipmap/ic_launcher_round"
-    android:supportsRtl="true"
+    android:supportsRtl="true">
-    tools:targetApi="m">
 
     <activity
       android:name=".main.CustomMainActivity"

custom/src/main/java/org/kiwix/kiwixmobile/custom/main/CustomReaderFragment.kt

@@ -18,9 +18,7 @@
 
 package org.kiwix.kiwixmobile.custom.main
 
-import android.annotation.TargetApi
 import android.app.Dialog
-import android.os.Build
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuInflater
@@ -138,7 +136,6 @@ class CustomReaderFragment : CoreReaderFragment() {
     )
   }
 
-  @TargetApi(Build.VERSION_CODES.M)
   private fun openObbOrZim() {
     customFileValidator.validate(
       onFilesFound = {

custom/src/main/res/drawable-night-v23/launch_screen.xml

@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?><!--
-  ~ Kiwix Android
-  ~ Copyright (c) 2020 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/>.
-  ~
-  -->
-
-<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
-  android:opacity="opaque">
-  <!-- The background color, preferably the same as your normal theme -->
-  <item android:drawable="@color/alabaster_white" />
-  <item
-    android:bottom="24dp"
-    android:drawable="@mipmap/ic_launcher"
-    android:gravity="center"
-    android:left="24dp"
-    android:right="24dp"
-    android:top="24dp" />
-</layer-list>

custom/src/main/res/drawable-v23/launch_screen.xml

@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?><!--
-  ~ Kiwix Android
-  ~ Copyright (c) 2020 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/>.
-  ~
-  -->
-
-<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
-  android:opacity="opaque">
-  <!-- The background color, preferably the same as your normal theme -->
-  <item android:drawable="@color/alabaster_white" />
-  <item
-    android:bottom="24dp"
-    android:drawable="@mipmap/ic_launcher"
-    android:gravity="center"
-    android:left="24dp"
-    android:right="24dp"
-    android:top="24dp" />
-</layer-list>