Show an alert dialog when no appropriate file manager was found

app/src/main/java/org/schabi/newpipe/download/DownloadDialog.java

@@ -53,6 +53,7 @@
 import org.schabi.newpipe.extractor.stream.SubtitlesStream;
 import org.schabi.newpipe.extractor.stream.VideoStream;
 import org.schabi.newpipe.settings.NewPipeSettings;
+import org.schabi.newpipe.streams.io.NoFileManagerSafeGuard;
 import org.schabi.newpipe.streams.io.StoredDirectoryHelper;
 import org.schabi.newpipe.streams.io.StoredFileHelper;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
@@ -687,7 +688,12 @@ private void showFailedDialog(@StringRes final int msg) {
     }
 
     private void launchDirectoryPicker(final ActivityResultLauncher<Intent> launcher) {
-        launcher.launch(StoredDirectoryHelper.getPicker(context));
+        NoFileManagerSafeGuard.launchSafe(
+                launcher,
+                StoredDirectoryHelper.getPicker(context),
+                TAG,
+                context
+        );
     }
 
     private void prepareSelectedDownload() {
@@ -766,8 +772,12 @@ private void prepareSelectedDownload() {
                 initialPath = Uri.parse(initialSavePath.getAbsolutePath());
             }
 
-            requestDownloadSaveAsLauncher.launch(StoredFileHelper.getNewPicker(context,
-                    filenameTmp, mimeTmp, initialPath));
+            NoFileManagerSafeGuard.launchSafe(
+                    requestDownloadSaveAsLauncher,
+                    StoredFileHelper.getNewPicker(context, filenameTmp, mimeTmp, initialPath),
+                    TAG,
+                    context
+            );
 
             return;
         }

app/src/main/java/org/schabi/newpipe/local/subscription/SubscriptionFragment.kt

@@ -55,6 +55,7 @@ import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService
 import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.KEY_MODE
 import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.KEY_VALUE
 import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.PREVIOUS_EXPORT_MODE
+import org.schabi.newpipe.streams.io.NoFileManagerSafeGuard
 import org.schabi.newpipe.streams.io.StoredFileHelper
 import org.schabi.newpipe.util.NavigationHelper
 import org.schabi.newpipe.util.OnClickGesture
@@ -179,15 +180,23 @@ class SubscriptionFragment : BaseStateFragment<SubscriptionState>() {
     }
 
     private fun onImportPreviousSelected() {
-        requestImportLauncher.launch(StoredFileHelper.getPicker(activity, JSON_MIME_TYPE))
+        NoFileManagerSafeGuard.launchSafe(
+            requestImportLauncher,
+            StoredFileHelper.getPicker(activity, JSON_MIME_TYPE),
+            TAG,
+            requireContext()
+        )
     }
 
     private fun onExportSelected() {
         val date = SimpleDateFormat("yyyyMMddHHmm", Locale.ENGLISH).format(Date())
         val exportName = "newpipe_subscriptions_$date.json"
 
-        requestExportLauncher.launch(
-            StoredFileHelper.getNewPicker(activity, exportName, JSON_MIME_TYPE, null)
+        NoFileManagerSafeGuard.launchSafe(
+            requestExportLauncher,
+            StoredFileHelper.getNewPicker(activity, exportName, JSON_MIME_TYPE, null),
+            TAG,
+            requireContext()
         )
     }
 

app/src/main/java/org/schabi/newpipe/local/subscription/SubscriptionsImportFragment.java

@@ -30,6 +30,7 @@
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.subscription.SubscriptionExtractor;
 import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService;
+import org.schabi.newpipe.streams.io.NoFileManagerSafeGuard;
 import org.schabi.newpipe.streams.io.StoredFileHelper;
 import org.schabi.newpipe.util.Constants;
 import org.schabi.newpipe.util.ServiceHelper;
@@ -175,8 +176,14 @@ public void onImportUrl(final String value) {
     }
 
     public void onImportFile() {
-        // leave */* mime type to support all services with different mime types and file extensions
-        requestImportFileLauncher.launch(StoredFileHelper.getPicker(activity, "*/*"));
+        NoFileManagerSafeGuard.launchSafe(
+                requestImportFileLauncher,
+                // leave */* mime type to support all services
+                // with different mime types and file extensions
+                StoredFileHelper.getPicker(activity, "*/*"),
+                TAG,
+                getContext()
+        );
     }
 
     private void requestImportFileResult(final ActivityResult result) {

app/src/main/java/org/schabi/newpipe/settings/ContentSettingsFragment.java

@@ -25,6 +25,7 @@
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.localization.ContentCountry;
 import org.schabi.newpipe.extractor.localization.Localization;
+import org.schabi.newpipe.streams.io.NoFileManagerSafeGuard;
 import org.schabi.newpipe.streams.io.StoredFileHelper;
 import org.schabi.newpipe.util.NavigationHelper;
 import org.schabi.newpipe.util.PicassoHelper;
@@ -73,19 +74,28 @@ public void onCreatePreferences(final Bundle savedInstanceState, final String ro
 
         final Preference importDataPreference = requirePreference(R.string.import_data);
         importDataPreference.setOnPreferenceClickListener((Preference p) -> {
-            requestImportPathLauncher.launch(
+            NoFileManagerSafeGuard.launchSafe(
+                    requestImportPathLauncher,
                     StoredFileHelper.getPicker(requireContext(),
-                            ZIP_MIME_TYPE, getImportExportDataUri()));
+                            ZIP_MIME_TYPE, getImportExportDataUri()),
+                    TAG,
+                    getContext()
+            );
+
             return true;
         });
 
         final Preference exportDataPreference = requirePreference(R.string.export_data);
         exportDataPreference.setOnPreferenceClickListener((final Preference p) -> {
-
-            requestExportPathLauncher.launch(
+            NoFileManagerSafeGuard.launchSafe(
+                    requestExportPathLauncher,
                     StoredFileHelper.getNewPicker(requireContext(),
                             "NewPipeData-" + exportDateFormat.format(new Date()) + ".zip",
-                            ZIP_MIME_TYPE, getImportExportDataUri()));
+                            ZIP_MIME_TYPE, getImportExportDataUri()),
+                    TAG,
+                    getContext()
+            );
+
             return true;
         });
 

app/src/main/java/org/schabi/newpipe/settings/DownloadSettingsFragment.java

@@ -21,6 +21,7 @@
 import com.nononsenseapps.filepicker.Utils;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.streams.io.NoFileManagerSafeGuard;
 import org.schabi.newpipe.streams.io.StoredDirectoryHelper;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
 
@@ -214,7 +215,12 @@ public boolean onPreferenceTreeClick(final Preference preference) {
     }
 
     private void launchDirectoryPicker(final ActivityResultLauncher<Intent> launcher) {
-        launcher.launch(StoredDirectoryHelper.getPicker(ctx));
+        NoFileManagerSafeGuard.launchSafe(
+                launcher,
+                StoredDirectoryHelper.getPicker(ctx),
+                TAG,
+                ctx
+        );
     }
 
     private void requestDownloadVideoPathResult(final ActivityResult result) {

app/src/main/java/org/schabi/newpipe/streams/io/NoFileManagerSafeGuard.java

@@ -0,0 +1,75 @@
+package org.schabi.newpipe.streams.io;
+
+import android.content.ActivityNotFoundException;
+import android.content.Context;
+import android.os.Build;
+import android.util.Log;
+
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.appcompat.app.AlertDialog;
+
+import org.schabi.newpipe.R;
+
+/**
+ * Helper for when no file-manager/activity was found.
+ */
+public final class NoFileManagerSafeGuard {
+    private NoFileManagerSafeGuard() {
+        // No impl
+    }
+
+    /**
+     * Shows an alert dialog when no file-manager is found.
+     * @param context Context
+     */
+    private static void showActivityNotFoundAlert(final Context context) {
+        if (context == null) {
+            throw new IllegalArgumentException(
+                    "Unable to open no file manager alert dialog: Context is null");
+        }
+
+        final String message;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            // Android 10+ only allows SAF
+            message = context.getString(R.string.no_appropriate_file_manager_message_android_10);
+        } else {
+            message = context.getString(
+                    R.string.no_appropriate_file_manager_message,
+                    context.getString(R.string.downloads_storage_use_saf_title));
+        }
+
+
+        new AlertDialog.Builder(context)
+                .setTitle(R.string.no_app_to_open_intent)
+                .setMessage(message)
+                .setPositiveButton(R.string.ok, null)
+                .show();
+    }
+
+    /**
+     * Launches the file manager safely.
+     *
+     * If no file manager is found (which is normally only the case when the user uninstalled
+     * the default file manager or the OS lacks one) an alert dialog shows up, asking the user
+     * to fix the situation.
+     *
+     * @param activityResultLauncher see {@link ActivityResultLauncher#launch(Object)}
+     * @param input see {@link ActivityResultLauncher#launch(Object)}
+     * @param tag Tag used for logging
+     * @param context Context
+     * @param <I> see {@link ActivityResultLauncher#launch(Object)}
+     */
+    public static <I> void launchSafe(
+            final ActivityResultLauncher<I> activityResultLauncher,
+            final I input,
+            final String tag,
+            final Context context
+    ) {
+        try {
+            activityResultLauncher.launch(input);
+        } catch (final ActivityNotFoundException aex) {
+            Log.w(tag, "Unable to launch file/directory picker", aex);
+            NoFileManagerSafeGuard.showActivityNotFoundAlert(context);
+        }
+    }
+}

app/src/main/java/us/shandian/giga/ui/fragment/MissionsFragment.java

@@ -32,6 +32,7 @@
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.settings.NewPipeSettings;
+import org.schabi.newpipe.streams.io.NoFileManagerSafeGuard;
 import org.schabi.newpipe.streams.io.StoredFileHelper;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
 
@@ -46,6 +47,7 @@
 
 public class MissionsFragment extends Fragment {
 
+    private static final String TAG = "MissionsFragment";
     private static final int SPAN_SIZE = 2;
 
     private SharedPreferences mPrefs;
@@ -257,9 +259,13 @@ private void recoverMission(@NonNull DownloadMission mission) {
             initialPath = Uri.parse(initialSavePath.getAbsolutePath());
         }
 
-        requestDownloadSaveAsLauncher.launch(
+        NoFileManagerSafeGuard.launchSafe(
+                requestDownloadSaveAsLauncher,
                 StoredFileHelper.getNewPicker(mContext, mission.storage.getName(),
-                        mission.storage.getType(), initialPath));
+                        mission.storage.getType(), initialPath),
+                TAG,
+                mContext
+        );
     }
 
     @Override

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

@@ -671,6 +671,8 @@
     <string name="recent">Recent</string>
     <string name="chapters">Chapters</string>
     <string name="no_app_to_open_intent">No app on your device can open this</string>
+    <string name="no_appropriate_file_manager_message">No appropriate file manager was found for this action.\nPlease install a file manager or try to disable \'%s\' in the download settings.</string>
+    <string name="no_appropriate_file_manager_message_android_10">No appropriate file manager was found for this action.\nPlease install a Storage Access Framework compatible file manager.</string>
     <string name="georestricted_content">This content is not available in your country.</string>
     <string name="soundcloud_go_plus_content">This is a SoundCloud Go+ track, at least in your country, so it cannot be streamed or downloaded by NewPipe.</string>
     <string name="private_content">This content is private, so it cannot be streamed or downloaded by NewPipe.</string>