fix(android): handle exteral storage

android/app/src/main/java/com/logseq/app/FileUtil.java

@@ -10,6 +10,9 @@ import android.os.Environment;
 import android.provider.DocumentsContract;
 import android.provider.MediaStore;
 import android.text.TextUtils;
+import android.util.Log;
+
+import java.io.File;
 
 // https://stackoverflow.com/questions/29713587/how-to-get-the-real-path-with-action-open-document-tree-intent
 // https://gist.github.com/asifmujteba/d89ba9074bc941de1eaa#file-asfurihelper
@@ -31,7 +34,26 @@ public class FileUtil {
                     return Environment.getExternalStorageDirectory() + "/" + split[1];
                 }
 
-                // TODO handle non-primary volumes
+                // NOTE: It's not a good idea to use storage root as Graph root.
+                String relPath = "";
+                if (split.length == 2) {
+                    relPath = split[1];
+                }
+
+                String storageState = Environment.getExternalStorageState();
+                if (storageState.equals(Environment.MEDIA_MOUNTED)) {
+                    // attempt 1
+                    File dir = new File("/storage/" + type + "/" + relPath);
+                    if (dir.exists()) {
+                        return dir.getPath();
+                    }
+                    // attempt 2
+                    dir = new File("/mnt/" + type + "/" + relPath);
+                    if (dir.exists()) {
+                        return dir.getPath();
+                    }
+                }
+                // TODO: other cases
             } else if (isDownloadsDocument(uri)) {
                 final String id = DocumentsContract.getDocumentId(uri);
                 if (!TextUtils.isEmpty(id)) {
@@ -67,7 +89,6 @@ public class FileUtil {
                 return getDataColumn(context, contentUri, selection, selectionArgs);
             }
         } else if ("content".equalsIgnoreCase(uri.getScheme())) {
-
             // Return the remote address
             if (isGooglePhotosUri(uri))
                 return uri.getLastPathSegment();

android/app/src/main/java/com/logseq/app/FolderPicker.java

@@ -58,7 +58,13 @@ public class FolderPicker extends Plugin {
         Uri docUri = DocumentsContract.buildDocumentUriUsingTree(treeUri,
                 DocumentsContract.getTreeDocumentId(treeUri));
         Log.i("Logseq/FolderPicker", "Got uri " + docUri);
-        ret.put("path", FileUtil.getPath(context, docUri));
-        call.resolve(ret);
+        String path = FileUtil.getPath(context, docUri);
+        Log.i("Logseq/FolderPicker", "Convert to path " + FileUtil.getPath(context, docUri));
+        if (path == null || path.isEmpty()) {
+            call.reject("Cannot support this directory type: " + docUri);
+        } else {
+            ret.put("path", path);
+            call.resolve(ret);
+        }
     }
 }

src/main/frontend/fs/capacitor_fs.cljs

@@ -308,9 +308,12 @@
   (open-dir [_this _ok-handler]
     (p/let [_    (when (= (mobile-util/platform) "android") (check-permission-android))
             {:keys [path localDocumentsPath]} (p/chain
-                                               (.pickFolder mobile-util/folder-picker)
+                                               (p/catch (.pickFolder mobile-util/folder-picker)
+                                                        (fn [e]
+                                                          (js/alert (str e))
+                                                          nil)) ;; NOTE: Can not pick folder, let it crash
                                                #(js->clj % :keywordize-keys true))
-            _ (when (and (mobile-util/native-ios?) 
+            _ (when (and (mobile-util/native-ios?)
                          (not (or (local-container-path? path localDocumentsPath)
                                   (mobile-util/iCloud-container-path? path))))
                 (state/pub-event! [:modal/show-instruction]))