Fix crash on download update

app/src/main/kotlin/org/koitharu/kotatsu/main/ui/MainActivity.kt

@@ -83,6 +83,7 @@ class MainActivity : BaseActivity<ActivityMainBinding>(), AppBarOwner, BottomNav
 	private val viewModel by viewModels<MainViewModel>()
 	private val searchSuggestionViewModel by viewModels<SearchSuggestionViewModel>()
 	private val closeSearchCallback = CloseSearchCallback()
+	private val appUpdateDialog = AppUpdateDialog(this)
 	private lateinit var navigationDelegate: MainNavigationDelegate
 	private lateinit var appUpdateBadge: OptionsMenuBadgeHelper
 
@@ -198,8 +199,7 @@ class MainActivity : BaseActivity<ActivityMainBinding>(), AppBarOwner, BottomNav
 
 		R.id.action_app_update -> {
 			viewModel.appUpdate.value?.also {
-				AppUpdateDialog(this)
-					.show(it)
+				appUpdateDialog.show(it)
 			} != null
 		}
 

app/src/main/kotlin/org/koitharu/kotatsu/settings/SettingsActivity.kt

@@ -29,6 +29,7 @@ import org.koitharu.kotatsu.databinding.ActivitySettingsBinding
 import org.koitharu.kotatsu.main.ui.owners.AppBarOwner
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.settings.about.AboutSettingsFragment
+import org.koitharu.kotatsu.settings.about.AppUpdateDialog
 import org.koitharu.kotatsu.settings.sources.SourceSettingsFragment
 import org.koitharu.kotatsu.settings.sources.SourcesManageFragment
 import org.koitharu.kotatsu.settings.tracker.TrackerSettingsFragment
@@ -41,6 +42,8 @@ class SettingsActivity :
 	AppBarOwner,
 	FragmentManager.OnBackStackChangedListener {
 
+	val appUpdateDialog = AppUpdateDialog(this)
+
 	override val appBar: AppBarLayout
 		get() = viewBinding.appbar
 

app/src/main/kotlin/org/koitharu/kotatsu/settings/about/AboutSettingsFragment.kt

@@ -20,6 +20,7 @@ import org.koitharu.kotatsu.core.ui.BasePreferenceFragment
 import org.koitharu.kotatsu.core.util.ShareHelper
 import org.koitharu.kotatsu.core.util.ext.observe
 import org.koitharu.kotatsu.core.util.ext.observeEvent
+import org.koitharu.kotatsu.settings.SettingsActivity
 import javax.inject.Inject
 
 @AndroidEntryPoint
@@ -76,7 +77,7 @@ class AboutSettingsFragment : BasePreferenceFragment(R.string.about) {
 			Snackbar.make(listView, R.string.no_update_available, Snackbar.LENGTH_SHORT).show()
 			return
 		}
-		AppUpdateDialog(context ?: return).show(version)
+		(activity as SettingsActivity).appUpdateDialog.show(version)
 	}
 
 	private fun openLink(url: String, title: CharSequence?) {

app/src/main/kotlin/org/koitharu/kotatsu/settings/about/AppUpdateDialog.kt

@@ -1,10 +1,14 @@
 package org.koitharu.kotatsu.settings.about
 
+import android.Manifest
 import android.app.DownloadManager
 import android.content.Context
 import android.content.Intent
+import android.os.Build
 import android.os.Environment
 import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.appcompat.app.AppCompatActivity
 import androidx.core.net.toUri
 import androidx.core.text.buildSpannedString
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
@@ -14,19 +18,32 @@ import org.koitharu.kotatsu.core.github.AppVersion
 import org.koitharu.kotatsu.core.util.FileSize
 import com.google.android.material.R as materialR
 
-class AppUpdateDialog(private val context: Context) {
+class AppUpdateDialog(private val activity: AppCompatActivity) {
+
+	private lateinit var latestVersion: AppVersion
+
+	private val permissionRequest = activity.registerForActivityResult(
+		ActivityResultContracts.RequestPermission(),
+	) {
+		if (it) {
+			downloadUpdateImpl()
+		} else {
+			openInBrowser()
+		}
+	}
 
 	fun show(version: AppVersion) {
+		latestVersion = version
 		val message = buildSpannedString {
-			append(context.getString(R.string.new_version_s, version.name))
+			append(activity.getString(R.string.new_version_s, version.name))
 			appendLine()
-			append(context.getString(R.string.size_s, FileSize.BYTES.format(context, version.apkSize)))
+			append(activity.getString(R.string.size_s, FileSize.BYTES.format(activity, version.apkSize)))
 			appendLine()
 			appendLine()
-			append(Markwon.create(context).toMarkdown(version.description))
+			append(Markwon.create(activity).toMarkdown(version.description))
 		}
 		MaterialAlertDialogBuilder(
-			context,
+			activity,
 			materialR.style.ThemeOverlay_Material3_MaterialAlertDialog_Centered,
 		)
 			.setTitle(R.string.app_update_available)
@@ -34,24 +51,38 @@ class AppUpdateDialog(private val context: Context) {
 			.setIcon(R.drawable.ic_app_update)
 			.setNeutralButton(R.string.open_in_browser) { _, _ ->
 				val intent = Intent(Intent.ACTION_VIEW, version.url.toUri())
-				context.startActivity(Intent.createChooser(intent, context.getString(R.string.open_in_browser)))
+				activity.startActivity(Intent.createChooser(intent, activity.getString(R.string.open_in_browser)))
 			}.setPositiveButton(R.string.update) { _, _ ->
-				downloadUpdate(version)
+				downloadUpdate()
 			}.setNegativeButton(android.R.string.cancel, null)
 			.setCancelable(false)
 			.create()
 			.show()
 	}
 
-	private fun downloadUpdate(version: AppVersion) {
+	private fun downloadUpdate() {
+		if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+			permissionRequest.launch(Manifest.permission.WRITE_EXTERNAL_STORAGE)
+		} else {
+			downloadUpdateImpl()
+		}
+	}
+
+	private fun downloadUpdateImpl() {
+		val version = latestVersion
 		val url = version.apkUrl.toUri()
-		val dm = context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
+		val dm = activity.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
 		val request = DownloadManager.Request(url)
-			.setTitle("${context.getString(R.string.app_name)} v${version.name}")
+			.setTitle("${activity.getString(R.string.app_name)} v${version.name}")
 			.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, url.lastPathSegment)
 			.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
 			.setMimeType("application/vnd.android.package-archive")
 		dm.enqueue(request)
-		Toast.makeText(context, R.string.download_started, Toast.LENGTH_SHORT).show()
+		Toast.makeText(activity, R.string.download_started, Toast.LENGTH_SHORT).show()
+	}
+
+	private fun openInBrowser() {
+		val intent = Intent(Intent.ACTION_VIEW, latestVersion.url.toUri())
+		activity.startActivity(Intent.createChooser(intent, activity.getString(R.string.open_in_browser)))
 	}
 }