Merge pull request #2800 from kiwix/Issue#2787

Change the method to get data directory path in Android 10+

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

@@ -18,8 +18,11 @@
 
 package org.kiwix.kiwixmobile.nav.destination.library
 
+import android.annotation.SuppressLint
+import android.app.Activity
 import android.content.Intent
 import android.net.ConnectivityManager
+import android.os.Build
 import android.os.Bundle
 import android.provider.Settings
 import android.view.LayoutInflater
@@ -28,6 +31,7 @@ import android.view.MenuInflater
 import android.view.MenuItem
 import android.view.View
 import android.view.ViewGroup
+import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.SearchView
 import androidx.appcompat.widget.Toolbar
@@ -51,15 +55,21 @@ import org.kiwix.kiwixmobile.core.extensions.ActivityExtensions.navigate
 import org.kiwix.kiwixmobile.core.extensions.ActivityExtensions.viewModel
 import org.kiwix.kiwixmobile.core.extensions.closeKeyboard
 import org.kiwix.kiwixmobile.core.extensions.snack
+import org.kiwix.kiwixmobile.core.extensions.toast
 import org.kiwix.kiwixmobile.core.main.CoreMainActivity
 import org.kiwix.kiwixmobile.core.utils.BookUtils
+import org.kiwix.kiwixmobile.core.utils.EXTERNAL_SELECT_POSITION
+import org.kiwix.kiwixmobile.core.utils.INTERNAL_SELECT_POSITION
 import org.kiwix.kiwixmobile.core.utils.NetworkUtils
+import org.kiwix.kiwixmobile.core.utils.REQUEST_SELECT_FOLDER_PERMISSION
 import org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil
 import org.kiwix.kiwixmobile.core.utils.SimpleRecyclerViewScrollListener
 import org.kiwix.kiwixmobile.core.utils.SimpleTextListener
 import org.kiwix.kiwixmobile.core.utils.dialog.DialogShower
 import org.kiwix.kiwixmobile.core.utils.dialog.KiwixDialog
+import org.kiwix.kiwixmobile.core.utils.dialog.KiwixDialog.SelectFolder
 import org.kiwix.kiwixmobile.core.utils.dialog.KiwixDialog.YesNoDialog.WifiOnly
+import org.kiwix.kiwixmobile.core.utils.files.FileUtils.getPathFromUri
 import org.kiwix.kiwixmobile.zim_manager.NetworkState
 import org.kiwix.kiwixmobile.zim_manager.ZimManageViewModel
 import org.kiwix.kiwixmobile.zim_manager.library_view.AvailableSpaceCalculator
@@ -242,8 +252,53 @@ class OnlineLibraryFragment : BaseFragment(), FragmentActivityExtensions {
     downloader.download(book)
   }
 
+  @SuppressLint("InflateParams")
   private fun storeDeviceInPreferences(storageDevice: StorageDevice) {
-    sharedPreferenceUtil.putPrefStorage(storageDevice.name)
+    if (storageDevice.isInternal) {
+      sharedPreferenceUtil.putPrefStorage(
+        sharedPreferenceUtil.getPublicDirectoryPath(storageDevice.name)
+      )
+      sharedPreferenceUtil.putStoragePosition(INTERNAL_SELECT_POSITION)
+    } else {
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+        val view = LayoutInflater.from(activity).inflate(R.layout.select_folder_dialog, null)
+        dialogShower.show(SelectFolder { view }, ::selectFolder)
+      } else {
+        sharedPreferenceUtil.putPrefStorage(storageDevice.name)
+        sharedPreferenceUtil.putStoragePosition(EXTERNAL_SELECT_POSITION)
+      }
+    }
+  }
+
+  private fun selectFolder() {
+    val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+    intent.addFlags(
+      Intent.FLAG_GRANT_READ_URI_PERMISSION
+        or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+        or Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
+        or Intent.FLAG_GRANT_PREFIX_URI_PERMISSION
+    )
+    startActivityForResult(intent, REQUEST_SELECT_FOLDER_PERMISSION)
+  }
+
+  @SuppressLint("WrongConstant") override fun onActivityResult(
+    requestCode: Int,
+    resultCode: Int,
+    data: Intent?
+  ) {
+    super.onActivityResult(requestCode, resultCode, data)
+    if (requestCode == REQUEST_SELECT_FOLDER_PERMISSION && resultCode == Activity.RESULT_OK) {
+      data?.let {
+        getPathFromUri(requireActivity(), data)?.let(sharedPreferenceUtil::putPrefStorage)
+        sharedPreferenceUtil.putStoragePosition(EXTERNAL_SELECT_POSITION)
+      } ?: run {
+        activity.toast(
+          resources
+            .getString(R.string.system_unable_to_grant_permission_message),
+          Toast.LENGTH_SHORT
+        )
+      }
+    }
   }
 
   private fun onBookItemClick(item: LibraryListItem.BookItem) {

app/src/main/java/org/kiwix/kiwixmobile/settings/KiwixPrefsFragment.kt

@@ -41,7 +41,9 @@ class KiwixPrefsFragment : CorePrefsFragment() {
 
   override fun setStorage() {
     findPreference<Preference>(PREF_STORAGE)?.title = getString(
-      if (sharedPreferenceUtil.prefStorage == internalStorage()) R.string.internal_storage
+      if (sharedPreferenceUtil.prefStorage == internalStorage()?.let
+          (sharedPreferenceUtil::getPublicDirectoryPath)
+      ) R.string.internal_storage
       else R.string.external_storage
     )
     findPreference<Preference>(PREF_STORAGE)?.summary = storageCalculator.calculateAvailableSpace()

buildSrc/src/main/kotlin/Libs.kt

@@ -7,54 +7,62 @@ import kotlin.String
  *   `$ ./gradlew buildSrcVersions`
  */
 object Libs {
+
+  /**
+   * For Getting Path of Selected Folder
+   **/
+
+  const val select_folder_document_file =
+    "androidx.documentfile:documentfile:" + Versions.document_file_version
+
   /**
    * https://github.com/Kotlin/kotlinx.coroutines
    */
   const val kotlinx_coroutines_android: String =
-      "org.jetbrains.kotlinx:kotlinx-coroutines-android:" +
+    "org.jetbrains.kotlinx:kotlinx-coroutines-android:" +
       Versions.org_jetbrains_kotlinx_kotlinx_coroutines
 
   /**
    * https://github.com/Kotlin/kotlinx.coroutines
    */
   const val kotlinx_coroutines_test: String = "org.jetbrains.kotlinx:kotlinx-coroutines-test:" +
-      Versions.org_jetbrains_kotlinx_kotlinx_coroutines
+    Versions.org_jetbrains_kotlinx_kotlinx_coroutines
 
   /**
    * https://developer.android.com/testing
    */
   const val espresso_contrib: String = "androidx.test.espresso:espresso-contrib:" +
-      Versions.androidx_test_espresso
+    Versions.androidx_test_espresso
 
   /**
    * https://developer.android.com/testing
    */
   const val espresso_core: String = "androidx.test.espresso:espresso-core:" +
-      Versions.androidx_test_espresso
+    Versions.androidx_test_espresso
 
   /**
    * https://developer.android.com/testing
    */
   const val espresso_intents: String = "androidx.test.espresso:espresso-intents:" +
-      Versions.androidx_test_espresso
+    Versions.androidx_test_espresso
 
   /**
    * https://developer.android.com/testing
    */
   const val espresso_web: String = "androidx.test.espresso:espresso-web:" +
-      Versions.androidx_test_espresso
+    Versions.androidx_test_espresso
 
   /**
    * https://github.com/square/retrofit
    */
   const val adapter_rxjava2: String = "com.squareup.retrofit2:adapter-rxjava2:" +
-      Versions.com_squareup_retrofit2
+    Versions.com_squareup_retrofit2
 
   /**
    * https://github.com/square/retrofit
    */
   const val converter_simplexml: String = "com.squareup.retrofit2:converter-simplexml:" +
-      Versions.com_squareup_retrofit2
+    Versions.com_squareup_retrofit2
 
   /**
    * https://github.com/square/retrofit
@@ -65,13 +73,13 @@ object Libs {
    * https://square.github.io/okhttp/
    */
   const val logging_interceptor: String = "com.squareup.okhttp3:logging-interceptor:" +
-      Versions.com_squareup_okhttp3
+    Versions.com_squareup_okhttp3
 
   /**
    * https://square.github.io/okhttp/
    */
   const val mockwebserver: String = "com.squareup.okhttp3:mockwebserver:" +
-      Versions.com_squareup_okhttp3
+    Versions.com_squareup_okhttp3
 
   /**
    * https://square.github.io/okhttp/
@@ -82,55 +90,55 @@ object Libs {
    * https://kotlinlang.org/
    */
   const val kotlin_android_extensions: String = "org.jetbrains.kotlin:kotlin-android-extensions:" +
-      Versions.org_jetbrains_kotlin
+    Versions.org_jetbrains_kotlin
 
   /**
    * https://kotlinlang.org/
    */
   const val kotlin_android_extensions_runtime: String =
-      "org.jetbrains.kotlin:kotlin-android-extensions-runtime:" + Versions.org_jetbrains_kotlin
+    "org.jetbrains.kotlin:kotlin-android-extensions-runtime:" + Versions.org_jetbrains_kotlin
 
   /**
    * https://kotlinlang.org/
    */
   const val kotlin_annotation_processing_gradle: String =
-      "org.jetbrains.kotlin:kotlin-annotation-processing-gradle:" + Versions.org_jetbrains_kotlin
+    "org.jetbrains.kotlin:kotlin-annotation-processing-gradle:" + Versions.org_jetbrains_kotlin
 
   /**
    * https://kotlinlang.org/
    */
   const val kotlin_gradle_plugin: String = "org.jetbrains.kotlin:kotlin-gradle-plugin:" +
-      Versions.org_jetbrains_kotlin
+    Versions.org_jetbrains_kotlin
 
   /**
    * https://kotlinlang.org/
    */
   const val kotlin_stdlib_jdk7: String = "org.jetbrains.kotlin:kotlin-stdlib-jdk7:" +
-      Versions.org_jetbrains_kotlin
+    Versions.org_jetbrains_kotlin
 
   /**
    * https://developer.android.com/topic/libraries/architecture/index.html
    */
   const val navigation_fragment_ktx: String = "androidx.navigation:navigation-fragment-ktx:" +
-      Versions.androidx_navigation
+    Versions.androidx_navigation
 
   /**
    * https://developer.android.com/topic/libraries/architecture/index.html
    */
   const val navigation_safe_args_gradle_plugin: String =
-      "androidx.navigation:navigation-safe-args-gradle-plugin:" + Versions.androidx_navigation
+    "androidx.navigation:navigation-safe-args-gradle-plugin:" + Versions.androidx_navigation
 
   /**
    * https://developer.android.com/topic/libraries/architecture/index.html
    */
   const val navigation_testing: String = "androidx.navigation:navigation-testing:" +
-      Versions.androidx_navigation
+    Versions.androidx_navigation
 
   /**
    * https://developer.android.com/topic/libraries/architecture/index.html
    */
   const val navigation_ui_ktx: String = "androidx.navigation:navigation-ui-ktx:" +
-      Versions.androidx_navigation
+    Versions.androidx_navigation
 
   /**
    * https://github.com/google/dagger
@@ -141,19 +149,19 @@ object Libs {
    * https://github.com/google/dagger
    */
   const val dagger_android: String = "com.google.dagger:dagger-android:" +
-      Versions.com_google_dagger
+    Versions.com_google_dagger
 
   /**
    * https://github.com/google/dagger
    */
   const val dagger_android_processor: String = "com.google.dagger:dagger-android-processor:" +
-      Versions.com_google_dagger
+    Versions.com_google_dagger
 
   /**
    * https://github.com/google/dagger
    */
   const val dagger_compiler: String = "com.google.dagger:dagger-compiler:" +
-      Versions.com_google_dagger
+    Versions.com_google_dagger
 
   /**
    * https://github.com/yahoo/squidb
@@ -164,13 +172,13 @@ object Libs {
    * https://github.com/yahoo/squidb
    */
   const val squidb_annotations: String = "com.yahoo.squidb:squidb-annotations:" +
-      Versions.com_yahoo_squidb
+    Versions.com_yahoo_squidb
 
   /**
    * https://github.com/yahoo/squidb
    */
   const val squidb_processor: String = "com.yahoo.squidb:squidb-processor:" +
-      Versions.com_yahoo_squidb
+    Versions.com_yahoo_squidb
 
   /**
    * https://github.com/JakeWharton/butterknife/
@@ -181,13 +189,13 @@ object Libs {
    * https://github.com/JakeWharton/butterknife/
    */
   const val butterknife_compiler: String = "com.jakewharton:butterknife-compiler:" +
-      Versions.com_jakewharton
+    Versions.com_jakewharton
 
   /**
    * https://github.com/JakeWharton/butterknife/
    */
   const val butterknife_gradle_plugin: String = "com.jakewharton:butterknife-gradle-plugin:" +
-      Versions.com_jakewharton
+    Versions.com_jakewharton
 
   /**
    * https://developer.android.com/testing
@@ -218,7 +226,7 @@ object Libs {
    * https://objectbox.io
    */
   const val objectbox_gradle_plugin: String = "io.objectbox:objectbox-gradle-plugin:" +
-      Versions.io_objectbox
+    Versions.io_objectbox
 
   /**
    * https://objectbox.io
@@ -234,7 +242,7 @@ object Libs {
    * https://objectbox.io
    */
   const val objectbox_processor: String = "io.objectbox:objectbox-processor:" +
-      Versions.io_objectbox
+    Versions.io_objectbox
 
   /**
    * https://objectbox.io
@@ -270,42 +278,42 @@ object Libs {
    * https://developer.android.com/topic/libraries/architecture/index.html
    */
   const val android_arch_lifecycle_extensions: String = "android.arch.lifecycle:extensions:" +
-      Versions.android_arch_lifecycle_extensions
+    Versions.android_arch_lifecycle_extensions
 
   /**
    * https://developer.android.com/studio
    */
   const val com_android_tools_build_gradle: String = "com.android.tools.build:gradle:" +
-      Versions.com_android_tools_build_gradle
+    Versions.com_android_tools_build_gradle
 
   const val de_fayard_buildsrcversions_gradle_plugin: String =
-      "de.fayard.buildSrcVersions:de.fayard.buildSrcVersions.gradle.plugin:" +
+    "de.fayard.buildSrcVersions:de.fayard.buildSrcVersions.gradle.plugin:" +
       Versions.de_fayard_buildsrcversions_gradle_plugin
 
   const val com_github_triplet_play_gradle_plugin: String =
-      "com.github.triplet.play:com.github.triplet.play.gradle.plugin:" +
+    "com.github.triplet.play:com.github.triplet.play.gradle.plugin:" +
       Versions.com_github_triplet_play_gradle_plugin
 
   /**
    * http://jcp.org/en/jsr/detail?id=250
    */
   const val javax_annotation_api: String = "javax.annotation:javax.annotation-api:" +
-      Versions.javax_annotation_api
+    Versions.javax_annotation_api
 
   const val ink_page_indicator: String = "com.pacioianu.david:ink-page-indicator:" +
-      Versions.ink_page_indicator
+    Versions.ink_page_indicator
 
   /**
    * http://github.com/square/leakcanary/
    */
   const val leakcanary_android: String = "com.squareup.leakcanary:leakcanary-android:" +
-      Versions.leakcanary_android
+    Versions.leakcanary_android
 
   /**
    * http://tools.android.com
    */
   const val constraintlayout: String = "androidx.constraintlayout:constraintlayout:" +
-      Versions.constraintlayout
+    Versions.constraintlayout
 
   /**
    * http://developer.android.com/tools/extras/support-library.html
@@ -323,7 +331,7 @@ object Libs {
   const val junit_jupiter: String = "org.junit.jupiter:junit-jupiter:" + Versions.junit_jupiter
 
   const val xfetch2okhttp: String = "androidx.tonyodev.fetch2okhttp:xfetch2okhttp:" +
-      Versions.xfetch2okhttp
+    Versions.xfetch2okhttp
 
   /**
    * https://assertj.github.io/doc/

buildSrc/src/main/kotlin/Versions.kt

@@ -11,6 +11,9 @@ import org.gradle.plugin.use.PluginDependencySpec
  * YOU are responsible for updating manually the dependency version.
  */
 object Versions {
+
+  const val document_file_version: String = "1.0.1"
+
   const val org_jetbrains_kotlinx_kotlinx_coroutines: String = "1.4.1"
 
   const val androidx_test_espresso: String = "3.3.0"
@@ -121,4 +124,4 @@ object Versions {
  */
 val PluginDependenciesSpec.buildSrcVersions: PluginDependencySpec
   inline get() =
-      id("de.fayard.buildSrcVersions").version(Versions.de_fayard_buildsrcversions_gradle_plugin)
+    id("de.fayard.buildSrcVersions").version(Versions.de_fayard_buildsrcversions_gradle_plugin)

core/build.gradle.kts

@@ -47,6 +47,9 @@ dependencies {
   implementation(Libs.squidb_annotations)
   add("kapt", Libs.squidb_processor)
 
+  // Document File
+  implementation(Libs.select_folder_document_file)
+
   // Square
   implementation(Libs.converter_simplexml) {
     exclude(group = "xpp3", module = "xpp3")

core/src/main/java/eu/mhutti1/utils/storage/StorageDeviceUtils.kt

@@ -33,7 +33,7 @@ object StorageDeviceUtils {
   @JvmStatic
   fun getReadableStorage(context: Context): List<StorageDevice> {
     val storageDevices = ArrayList<StorageDevice>().apply {
-      add(environmentDevices())
+      add(environmentDevices(context))
       addAll(externalMountPointDevices())
       addAll(externalFilesDirsDevices(context, false))
     }
@@ -63,9 +63,9 @@ object StorageDeviceUtils {
       ?.map { dir -> StorageDevice(dir, false) }
       .orEmpty()
 
-  private fun environmentDevices() =
+  private fun environmentDevices(context: Context) =
     StorageDevice(
-      generalisePath(Environment.getExternalStorageDirectory().path, false),
+      generalisePath(context.getExternalFilesDir("").toString(), true),
       Environment.isExternalStorageEmulated()
     )
 

core/src/main/java/eu/mhutti1/utils/storage/adapter/StorageViewHolder.kt

@@ -43,7 +43,9 @@ internal class StorageViewHolder(
       else R.string.external_storage
     )
 
-    file_name.isChecked = sharedPreferenceUtil.prefStorage == item.name
+    if (adapterPosition == sharedPreferenceUtil.storagePosition) {
+      file_name.isChecked = true
+    }
     file_size.text = storageCalculator.calculateAvailableSpace(item.file) + " / " +
       storageCalculator.calculateTotalSpace(item.file) + "  "
     clickOverlay.setOnClickListener {

core/src/main/java/org/kiwix/kiwixmobile/core/settings/CorePrefsFragment.java

@@ -20,11 +20,15 @@ package org.kiwix.kiwixmobile.core.settings;
 
 import android.Manifest;
 import android.annotation.SuppressLint;
+import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
+import android.os.Build;
 import android.os.Bundle;
 import android.view.LayoutInflater;
+import android.view.View;
 import android.webkit.WebView;
+import androidx.annotation.Nullable;
 import androidx.core.content.ContextCompat;
 import androidx.navigation.NavController;
 import androidx.preference.EditTextPreference;
@@ -50,7 +54,13 @@ import org.kiwix.kiwixmobile.core.utils.LanguageUtils;
 import org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil;
 import org.kiwix.kiwixmobile.core.utils.dialog.DialogShower;
 import org.kiwix.kiwixmobile.core.utils.dialog.KiwixDialog;
+import org.kiwix.kiwixmobile.core.utils.files.FileUtils;
 
+import static android.app.Activity.RESULT_OK;
+import static android.content.Intent.ACTION_OPEN_DOCUMENT_TREE;
+import static org.kiwix.kiwixmobile.core.utils.ConstantsKt.EXTERNAL_SELECT_POSITION;
+import static org.kiwix.kiwixmobile.core.utils.ConstantsKt.INTERNAL_SELECT_POSITION;
+import static org.kiwix.kiwixmobile.core.utils.ConstantsKt.REQUEST_SELECT_FOLDER_PERMISSION;
 import static org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil.PREF_NIGHT_MODE;
 import static org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil.PREF_STORAGE;
 
@@ -175,9 +185,6 @@ public abstract class CorePrefsFragment extends PreferenceFragmentCompat impleme
     versionPref.setSummary(getVersionName() + " Build: " + getVersionCode());
   }
 
-
-
-
   private int getVersionCode() {
     try {
       return getActivity().getPackageManager()
@@ -278,13 +285,47 @@ public abstract class CorePrefsFragment extends PreferenceFragmentCompat impleme
     findPreference(PREF_STORAGE).setSummary(
       storageCalculator.calculateAvailableSpace(storageDevice.getFile())
     );
-    sharedPreferenceUtil.putPrefStorage(storageDevice.getName());
+
     if (storageDevice.isInternal()) {
+      sharedPreferenceUtil.putPrefStorage(
+        sharedPreferenceUtil.getPublicDirectoryPath(storageDevice.getName()));
       findPreference(PREF_STORAGE).setTitle(getString(R.string.internal_storage));
+      sharedPreferenceUtil.putStoragePosition(INTERNAL_SELECT_POSITION);
     } else {
-      findPreference(PREF_STORAGE).setTitle(getString(R.string.external_storage));
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+        @SuppressLint("InflateParams") View view = LayoutInflater.from(getActivity()).inflate(R.layout.select_folder_dialog, null);
+        alertDialogShower.show(new KiwixDialog.SelectFolder(() -> view), () -> {
+          selectFolder();
+          return Unit.INSTANCE;
+        });
+      } else {
+        sharedPreferenceUtil.putPrefStorage(storageDevice.getName());
+        findPreference(PREF_STORAGE).setTitle(getString(R.string.external_storage));
+        sharedPreferenceUtil.putStoragePosition(EXTERNAL_SELECT_POSITION);
+      }
     }
     return Unit.INSTANCE;
   }
 
+  private void selectFolder() {
+    Intent intent = new Intent(ACTION_OPEN_DOCUMENT_TREE);
+    intent.addFlags(
+      Intent.FLAG_GRANT_READ_URI_PERMISSION
+        | Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+        | Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
+        | Intent.FLAG_GRANT_PREFIX_URI_PERMISSION);
+    startActivityForResult(intent, REQUEST_SELECT_FOLDER_PERMISSION);
+  }
+
+  @SuppressLint("WrongConstant") @Override
+  public void onActivityResult(int requestCode, int resultCode,
+    @Nullable Intent data) {
+    super.onActivityResult(requestCode, resultCode, data);
+    if (requestCode == REQUEST_SELECT_FOLDER_PERMISSION && resultCode == RESULT_OK) {
+      sharedPreferenceUtil.putPrefStorage(
+        FileUtils.getPathFromUri(requireActivity(), data));
+      findPreference(PREF_STORAGE).setTitle(getString(R.string.external_storage));
+      sharedPreferenceUtil.putStoragePosition(EXTERNAL_SELECT_POSITION);
+    }
+  }
 }

core/src/main/java/org/kiwix/kiwixmobile/core/utils/Constants.kt

@@ -23,6 +23,7 @@ const val CONTACT_EMAIL_ADDRESS = "android@kiwix.org"
 // Request stuff
 const val REQUEST_STORAGE_PERMISSION = 1
 const val REQUEST_WRITE_STORAGE_PERMISSION_ADD_NOTE = 3
+const val REQUEST_SELECT_FOLDER_PERMISSION = 4
 
 // Tags
 const val TAG_FILE_SEARCHED = "searchedarticle"
@@ -37,3 +38,7 @@ const val TAG_FROM_TAB_SWITCHER = "fromtabswitcher"
 const val EXTRA_IS_WIDGET_VOICE = "isWidgetVoice"
 const val HOTSPOT_SERVICE_CHANNEL_ID = "hotspotService"
 const val OLD_PROVIDER_DOMAIN = "org.kiwix.zim.base"
+
+// For Storage select dialog
+const val INTERNAL_SELECT_POSITION = 0
+const val EXTERNAL_SELECT_POSITION = 1

core/src/main/java/org/kiwix/kiwixmobile/core/utils/SharedPreferenceUtil.kt

@@ -27,6 +27,7 @@ import io.reactivex.Flowable
 import io.reactivex.processors.PublishProcessor
 import org.kiwix.kiwixmobile.core.NightModeConfig
 import org.kiwix.kiwixmobile.core.NightModeConfig.Mode.Companion.from
+import org.kiwix.kiwixmobile.core.R
 import java.io.File
 import java.util.Locale
 import javax.inject.Inject
@@ -76,12 +77,20 @@ class SharedPreferenceUtil @Inject constructor(val context: Context) {
     get() {
       val storage = sharedPreferences.getString(PREF_STORAGE, null)
       return when {
-        storage == null -> defaultStorage().also(::putPrefStorage)
+        storage == null -> getPublicDirectoryPath(defaultStorage()).also {
-        !File(storage).exists() -> defaultStorage()
+          putPrefStorage(it)
+          putStoragePosition(0)
+        }
+        !File(storage).exists() -> getPublicDirectoryPath(defaultStorage()).also {
+          putStoragePosition(0)
+        }
         else -> storage
       }
     }
 
+  val storagePosition: Int
+    get() = sharedPreferences.getInt(STORAGE_POSITION, 0)
+
   private fun defaultStorage(): String =
     getExternalFilesDirs(context, null)[0]?.path
       ?: context.filesDir.path // a workaround for emulators
@@ -108,6 +117,10 @@ class SharedPreferenceUtil @Inject constructor(val context: Context) {
     _prefStorages.onNext(storage)
   }
 
+  fun putStoragePosition(pos: Int) {
+    sharedPreferences.edit { putInt(STORAGE_POSITION, pos) }
+  }
+
   fun putPrefFullScreen(fullScreen: Boolean) =
     sharedPreferences.edit { putBoolean(PREF_FULLSCREEN, fullScreen) }
 
@@ -160,10 +173,14 @@ class SharedPreferenceUtil @Inject constructor(val context: Context) {
       _textZooms.offer(textZoom)
     }
 
+  fun getPublicDirectoryPath(path: String): String =
+    path.substringBefore(context.getString(R.string.android_directory_seperator))
+
   companion object {
     // Prefs
     const val PREF_LANG = "pref_language_chooser"
     const val PREF_STORAGE = "pref_select_folder"
+    const val STORAGE_POSITION = "storage_position"
     const val PREF_WIFI_ONLY = "pref_wifi_only"
     const val PREF_KIWIX_MOBILE = "kiwix-mobile"
     const val PREF_SHOW_INTRO = "showIntro"

core/src/main/java/org/kiwix/kiwixmobile/core/utils/dialog/KiwixDialog.kt

@@ -185,6 +185,14 @@ sealed class KiwixDialog(
     getView = customGetView
   )
 
+  data class SelectFolder(val customGetView: (() -> View)?) : KiwixDialog(
+    R.string.select_folder,
+    null,
+    android.R.string.ok,
+    null,
+    getView = customGetView
+  )
+
   object NotesDiscardConfirmation : KiwixDialog(
     null,
     R.string.confirmation_alert_dialog_message,

core/src/main/java/org/kiwix/kiwixmobile/core/utils/files/FileUtils.kt

@@ -17,19 +17,25 @@
  */
 package org.kiwix.kiwixmobile.core.utils.files
 
+import android.annotation.SuppressLint
+import android.app.Activity
 import android.content.ContentUris
 import android.content.Context
+import android.content.Intent
 import android.net.Uri
 import android.os.Environment
 import android.provider.DocumentsContract
 import android.util.Log
+import android.widget.Toast
+import androidx.documentfile.provider.DocumentFile
+import org.kiwix.kiwixmobile.core.R
 import org.kiwix.kiwixmobile.core.downloader.ChunkUtils
 import org.kiwix.kiwixmobile.core.entity.LibraryNetworkEntity.Book
 import org.kiwix.kiwixmobile.core.extensions.get
+import org.kiwix.kiwixmobile.core.extensions.toast
 import java.io.BufferedReader
 import java.io.File
 import java.io.IOException
-import java.util.ArrayList
 
 object FileUtils {
 
@@ -228,4 +234,44 @@ object FileUtils {
   } catch (e: IOException) {
     "".also { e.printStackTrace() }
   }
+
+  @SuppressLint("WrongConstant")
+  @JvmStatic fun getPathFromUri(activity: Activity, data: Intent): String? {
+    val uri: Uri? = data.data
+    val takeFlags: Int = data.flags and (Intent.FLAG_GRANT_READ_URI_PERMISSION
+      or Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+    uri?.let {
+      activity.grantUriPermission(
+        activity.packageName, it,
+        Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+      )
+      activity.contentResolver.takePersistableUriPermission(it, takeFlags)
+
+      val dFile = DocumentFile.fromTreeUri(activity, it)
+      if (dFile != null) {
+        dFile.uri.path?.let { file ->
+          val originalPath = file.substring(
+            file.lastIndexOf(":") + 1
+          )
+          val path = "${activity.getExternalFilesDirs("")[1]}"
+          return@getPathFromUri path.substringBefore(
+            activity.getString(R.string.android_directory_seperator)
+          )
+            .plus(File.separator).plus(originalPath)
+        }
+      }
+      activity.toast(
+        activity.resources
+          .getString(R.string.system_unable_to_grant_permission_message),
+        Toast.LENGTH_SHORT
+      )
+    } ?: run {
+      activity.toast(
+        activity.resources
+          .getString(R.string.system_unable_to_grant_permission_message),
+        Toast.LENGTH_SHORT
+      )
+    }
+    return null
+  }
 }

core/src/main/res/layout/select_folder_dialog.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Kiwix Android
+  ~ Copyright (c) 2022 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/>.
+  ~
+  -->
+
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto"
+  android:layout_width="match_parent"
+  android:layout_height="wrap_content">
+
+  <ImageView
+    android:id="@+id/img"
+    android:layout_width="match_parent"
+    android:layout_height="120dp"
+    android:layout_marginTop="15dp"
+    android:contentDescription="@string/app_name"
+    android:src="@drawable/select_folder_preview_image1"
+    app:layout_constraintEnd_toEndOf="parent"
+    app:layout_constraintStart_toStartOf="parent"
+    app:layout_constraintTop_toTopOf="parent" />
+
+  <ImageView
+    android:layout_width="match_parent"
+    android:layout_height="120dp"
+    android:layout_marginTop="5dp"
+    android:layout_marginBottom="8dp"
+    android:contentDescription="@string/app_name"
+    android:src="@drawable/select_folder_preview_image2"
+    app:layout_constraintEnd_toEndOf="parent"
+    app:layout_constraintStart_toStartOf="parent"
+    app:layout_constraintTop_toBottomOf="@+id/img" />
+</androidx.constraintlayout.widget.ConstraintLayout>

core/src/main/res/values/strings.xml

@@ -295,6 +295,9 @@
   <string name="all_files_permission_needed_message">In order to access all the zim files across device we need to have All Files Permission</string>
   <string name="allowed">Allowed</string>
   <string name="not_allowed">Not allowed</string>
+  <string name="android_directory_seperator" translatable="false">/Android</string>
+  <string name="select_folder" translatable="false">Please select a folder for external storage.</string>
+  <string name="system_unable_to_grant_permission_message" translatable="false">System unable to grant permission!</string>
   <string-array name="pref_night_modes_entries">
     <item>@string/on</item>
     <item>@string/off</item>