feat: support for external download apps

app/src/main/java/com/github/libretube/constants/PreferenceKeys.kt

@@ -144,6 +144,7 @@ object PreferenceKeys {
     const val CONFIRM_UNSUBSCRIBE = "confirm_unsubscribing"
     const val CLEAR_BOOKMARKS = "clear_bookmarks"
     const val MAX_CONCURRENT_DOWNLOADS = "max_parallel_downloads"
+    const val EXTERNAL_DOWNLOAD_PROVIDER = "external_download_provider"
     const val DISABLE_VIDEO_IMAGE_PROXY = "disable_video_image_proxy"
     const val CONTRIBUTE_TO_SB = "sb_contribute_key"
     const val CONTRIBUTE_TO_DEARROW = "dearrow_contribute_key"

app/src/main/java/com/github/libretube/helpers/DownloadHelper.kt

@@ -4,11 +4,18 @@ import android.content.Context
 import android.content.Intent
 import android.os.Build
 import androidx.core.content.ContextCompat
+import androidx.core.net.toUri
+import androidx.core.os.bundleOf
+import androidx.fragment.app.FragmentManager
 import com.github.libretube.constants.IntentData
 import com.github.libretube.constants.PreferenceKeys
 import com.github.libretube.db.obj.DownloadItem
+import com.github.libretube.enums.PlaylistType
 import com.github.libretube.parcelable.DownloadData
 import com.github.libretube.services.DownloadService
+import com.github.libretube.ui.dialogs.DownloadDialog
+import com.github.libretube.ui.dialogs.DownloadPlaylistDialog
+import com.github.libretube.ui.dialogs.ShareDialog
 import java.nio.file.Path
 import kotlin.io.path.createDirectories
 import kotlin.io.path.div
@@ -17,11 +24,11 @@ object DownloadHelper {
     const val VIDEO_DIR = "video"
     const val AUDIO_DIR = "audio"
     const val SUBTITLE_DIR = "subtitle"
-    const val METADATA_DIR = "metadata"
     const val THUMBNAIL_DIR = "thumbnail"
     const val DOWNLOAD_CHUNK_SIZE = 8L * 1024
     const val DEFAULT_TIMEOUT = 15 * 1000
     const val DEFAULT_RETRY = 3
+    private const val videoMimeType = "video/*"
 
     fun getDownloadDir(context: Context, path: String): Path {
         val storageDir = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
@@ -53,4 +60,49 @@ object DownloadHelper {
     fun DownloadItem.getNotificationId(): Int {
         return Int.MAX_VALUE - id
     }
+
+    fun startDownloadDialog(context: Context, fragmentManager: FragmentManager, videoId: String) {
+        val externalProviderPackageName =
+            PreferenceHelper.getString(PreferenceKeys.EXTERNAL_DOWNLOAD_PROVIDER, "")
+
+        if (externalProviderPackageName.isBlank()) {
+            DownloadDialog().apply {
+                arguments = bundleOf(IntentData.videoId to videoId)
+            }.show(fragmentManager, DownloadDialog::class.java.name)
+        } else {
+            val intent = Intent(Intent.ACTION_VIEW)
+                .setPackage(externalProviderPackageName)
+                .setDataAndType("${ShareDialog.YOUTUBE_FRONTEND_URL}/watch?v=$videoId".toUri(), videoMimeType)
+
+            runCatching { context.startActivity(intent) }
+        }
+    }
+
+    fun startDownloadPlaylistDialog(
+        context: Context,
+        fragmentManager: FragmentManager,
+        playlistId: String,
+        playlistName: String,
+        playlistType: PlaylistType
+    ) {
+        val externalProviderPackageName =
+            PreferenceHelper.getString(PreferenceKeys.EXTERNAL_DOWNLOAD_PROVIDER, "")
+
+        if (externalProviderPackageName.isBlank()) {
+            val downloadPlaylistDialog = DownloadPlaylistDialog().apply {
+                arguments = bundleOf(
+                    IntentData.playlistId to playlistId,
+                    IntentData.playlistName to playlistName,
+                    IntentData.playlistType to playlistType
+                )
+            }
+            downloadPlaylistDialog.show(fragmentManager, null)
+        } else {
+            val intent = Intent(Intent.ACTION_VIEW)
+                .setPackage(externalProviderPackageName)
+                .setDataAndType("${ShareDialog.YOUTUBE_FRONTEND_URL}/playlist?list=$playlistId".toUri(), videoMimeType)
+
+            runCatching { context.startActivity(intent) }
+        }
+    }
 }

app/src/main/java/com/github/libretube/ui/fragments/PlayerFragment.kt

@@ -72,6 +72,7 @@ import com.github.libretube.extensions.togglePlayPauseState
 import com.github.libretube.extensions.updateIfChanged
 import com.github.libretube.extensions.updateParameters
 import com.github.libretube.helpers.BackgroundHelper
+import com.github.libretube.helpers.DownloadHelper
 import com.github.libretube.helpers.ImageHelper
 import com.github.libretube.helpers.IntentHelper
 import com.github.libretube.helpers.NavBarHelper
@@ -92,7 +93,6 @@ import com.github.libretube.ui.activities.MainActivity
 import com.github.libretube.ui.adapters.VideosAdapter
 import com.github.libretube.ui.base.BaseActivity
 import com.github.libretube.ui.dialogs.AddToPlaylistDialog
-import com.github.libretube.ui.dialogs.DownloadDialog
 import com.github.libretube.ui.dialogs.ShareDialog
 import com.github.libretube.ui.extensions.animateDown
 import com.github.libretube.ui.extensions.setupSubscriptionButton
@@ -625,9 +625,7 @@ class PlayerFragment : Fragment(), OnlinePlayerOptions {
             if (streams.duration <= 0) {
                 Toast.makeText(context, R.string.cannotDownload, Toast.LENGTH_SHORT).show()
             } else {
-                val newFragment = DownloadDialog()
+                DownloadHelper.startDownloadDialog(requireContext(), childFragmentManager, videoId)
-                newFragment.arguments = bundleOf(IntentData.videoId to videoId)
-                newFragment.show(childFragmentManager, DownloadDialog::class.java.name)
             }
         }
 

app/src/main/java/com/github/libretube/ui/sheets/PlaylistOptionsBottomSheet.kt

@@ -13,10 +13,10 @@ import com.github.libretube.extensions.serializable
 import com.github.libretube.extensions.toID
 import com.github.libretube.extensions.toastFromMainDispatcher
 import com.github.libretube.helpers.BackgroundHelper
+import com.github.libretube.helpers.DownloadHelper
 import com.github.libretube.obj.ShareData
 import com.github.libretube.ui.base.BaseActivity
 import com.github.libretube.ui.dialogs.DeletePlaylistDialog
-import com.github.libretube.ui.dialogs.DownloadPlaylistDialog
 import com.github.libretube.ui.dialogs.PlaylistDescriptionDialog
 import com.github.libretube.ui.dialogs.RenamePlaylistDialog
 import com.github.libretube.ui.dialogs.ShareDialog
@@ -139,14 +139,7 @@ class PlaylistOptionsBottomSheet : BaseBottomSheet() {
                 }
 
                 R.string.download -> {
-                    val downloadPlaylistDialog = DownloadPlaylistDialog().apply {
+                    DownloadHelper.startDownloadPlaylistDialog(requireContext(), mFragmentManager, playlistId, playlistName, playlistType)
-                        arguments = bundleOf(
-                            IntentData.playlistId to playlistId,
-                            IntentData.playlistName to playlistName,
-                            IntentData.playlistType to playlistType
-                        )
-                    }
-                    downloadPlaylistDialog.show(mFragmentManager, null)
                 }
 
                 else -> {

app/src/main/java/com/github/libretube/ui/sheets/VideoOptionsBottomSheet.kt

@@ -15,13 +15,13 @@ import com.github.libretube.enums.ShareObjectType
 import com.github.libretube.extensions.parcelable
 import com.github.libretube.extensions.toID
 import com.github.libretube.helpers.BackgroundHelper
+import com.github.libretube.helpers.DownloadHelper
 import com.github.libretube.helpers.NavigationHelper
 import com.github.libretube.helpers.PlayerHelper
 import com.github.libretube.helpers.PreferenceHelper
 import com.github.libretube.obj.ShareData
 import com.github.libretube.ui.activities.MainActivity
 import com.github.libretube.ui.dialogs.AddToPlaylistDialog
-import com.github.libretube.ui.dialogs.DownloadDialog
 import com.github.libretube.ui.dialogs.ShareDialog
 import com.github.libretube.ui.fragments.SubscriptionsFragment
 import com.github.libretube.util.PlayingQueue
@@ -71,9 +71,7 @@ class VideoOptionsBottomSheet : BaseBottomSheet() {
                 }
 
                 R.string.download -> {
-                    val newFragment = DownloadDialog()
+                    DownloadHelper.startDownloadDialog(requireContext(), parentFragmentManager, videoId)
-                    newFragment.arguments = bundleOf(IntentData.videoId to videoId)
-                    newFragment.show(parentFragmentManager, DownloadDialog::class.java.name)
                 }
 
                 R.string.share -> {

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

@@ -506,6 +506,8 @@
     <string name="uptime">%.2f%% uptime</string>
     <string name="change">Change</string>
     <string name="gestures">Gestures</string>
+    <string name="external_download_provider">External download provider</string>
+    <string name="external_download_provider_summary">Enter the package name of the app you want to use for downloading videos. Leave blank to use LibreTube\'s inbuilt downloader.</string>
 
     <!-- Notification channel strings -->
     <string name="download_channel_name">Download Service</string>

app/src/main/res/xml/advanced_settings.xml

@@ -26,15 +26,6 @@
             app:key="play_automatically"
             app:title="@string/play_automatically" />
 
-        <com.github.libretube.ui.views.SliderPreference
-            android:icon="@drawable/ic_download"
-            android:key="max_parallel_downloads"
-            android:title="@string/concurrent_downloads"
-            app:defValue="6"
-            app:stepSize="1"
-            app:valueFrom="1"
-            app:valueTo="6" />
-
         <ListPreference
             android:entries="@array/cacheSize"
             android:entryValues="@array/cacheSizeValues"
@@ -58,6 +49,25 @@
 
     </PreferenceCategory>
 
+    <PreferenceCategory app:title="@string/downloads">
+
+        <com.github.libretube.ui.views.SliderPreference
+            android:icon="@drawable/ic_download"
+            android:key="max_parallel_downloads"
+            android:title="@string/concurrent_downloads"
+            app:defValue="6"
+            app:stepSize="1"
+            app:valueFrom="1"
+            app:valueTo="6" />
+
+        <EditTextPreference
+            android:icon="@drawable/ic_open"
+            android:key="external_download_provider"
+            android:summary="@string/external_download_provider_summary"
+            android:title="@string/external_download_provider" />
+
+    </PreferenceCategory>
+
     <PreferenceCategory app:title="@string/misc">
 
         <Preference