Add QBDocumentsProvider

qb-mobile/android/app/src/main/AndroidManifest.xml

@@ -33,6 +33,18 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
+
+        <provider
+            android:name="org.quixbyte.qb_mobile.QBDocumentsProvider"
+            android:authorities="com.example.android.storageprovider.documents"
+            android:grantUriPermissions="true"
+            android:exported="true"
+            android:permission="android.permission.MANAGE_DOCUMENTS">
+            <intent-filter>
+                <action android:name="android.content.action.DOCUMENTS_PROVIDER" />
+            </intent-filter>
+        </provider>
+
     </application>
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility and

qb-mobile/android/app/src/main/kotlin/org/quixbyte/qb_mobile/QBDocumentsProvider.kt

@@ -0,0 +1,91 @@
+package org.quixbyte.qb_mobile
+
+import android.database.Cursor
+import android.database.MatrixCursor
+import android.os.CancellationSignal
+import android.os.ParcelFileDescriptor
+import android.provider.DocumentsContract.Document
+import android.provider.DocumentsContract.Root
+import android.provider.DocumentsProvider
+
+
+class QBDocumentsProvider : DocumentsProvider() {
+    var DEFAULT_ROOT_PROJECTION =
+        arrayOf(
+            Root.COLUMN_ROOT_ID, Root.COLUMN_MIME_TYPES,
+            Root.COLUMN_FLAGS, Root.COLUMN_ICON, Root.COLUMN_TITLE,
+            Root.COLUMN_SUMMARY, Root.COLUMN_DOCUMENT_ID,
+            Root.COLUMN_AVAILABLE_BYTES,
+        )
+    var DEFAULT_DOCUMENT_PROJECTION = arrayOf(
+        Document.COLUMN_DOCUMENT_ID, Document.COLUMN_MIME_TYPE,
+        Document.COLUMN_DISPLAY_NAME, Document.COLUMN_LAST_MODIFIED,
+        Document.COLUMN_FLAGS, Document.COLUMN_SIZE,
+    )
+
+
+    override fun queryRoots(projection: Array<out String?>?): Cursor? {
+        var result =
+            MatrixCursor(DEFAULT_ROOT_PROJECTION);
+
+        // It's possible to have multiple roots (e.g. for multiple accounts in the
+        // same app) -- just add multiple cursor rows.
+        var row = result.newRow();
+        row.add(Root.COLUMN_ROOT_ID, "qb_mobile")
+
+        // You can provide an optional summary, which helps distinguish roots
+        // with the same title. You can also use this field for displaying an
+        // user account name.
+        row.add(Root.COLUMN_SUMMARY, "a service for quickly synchronizing files")
+
+        // FLAG_SUPPORTS_CREATE means at least one directory under the root supports
+        // creating documents. FLAG_SUPPORTS_RECENTS means your application's most
+        // recently used documents will show up in the "Recents" category.
+        // FLAG_SUPPORTS_SEARCH allows users to search all documents the application
+        // shares.
+        row.add(
+            Root.COLUMN_FLAGS,
+            Root.FLAG_SUPPORTS_CREATE or Root.FLAG_SUPPORTS_RECENTS or Root.FLAG_SUPPORTS_SEARCH)
+
+        // COLUMN_TITLE is the root title (e.g. Gallery, Drive).
+        row.add(Root.COLUMN_TITLE, "QuixByte")
+
+        // This document id cannot change after it's shared.
+        row.add(Root.COLUMN_DOCUMENT_ID, 0);
+
+        // The child MIME types are used to filter the roots and only present to the
+        // user those roots that contain the desired type somewhere in their file hierarchy.
+        row.add(Root.COLUMN_MIME_TYPES, "");
+        row.add(Root.COLUMN_AVAILABLE_BYTES, 100000);
+        row.add(Root.COLUMN_ICON, "");
+
+        return result
+    }
+
+    override fun queryDocument(
+        documentId: String?,
+        projection: Array<out String?>?
+    ): Cursor? {
+        TODO("Not yet implemented")
+    }
+
+    override fun queryChildDocuments(
+        parentDocumentId: String?,
+        projection: Array<out String?>?,
+        sortOrder: String?
+    ): Cursor? {
+        TODO("Not yet implemented")
+    }
+
+    override fun openDocument(
+        documentId: String?,
+        mode: String?,
+        signal: CancellationSignal?
+    ): ParcelFileDescriptor? {
+        TODO("Not yet implemented")
+    }
+
+    override fun onCreate(): Boolean {
+        return true
+    }
+}