open file manager opens directory provider

app/src/main/java/com/geode/launcher/SettingsActivity.kt

@@ -8,6 +8,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Build
 import android.os.Bundle
+import android.provider.DocumentsContract
 import android.widget.Toast
 import androidx.activity.ComponentActivity
 import androidx.activity.OnBackPressedDispatcher
@@ -110,9 +111,21 @@ fun onOpenFolder(context: Context) {
 }
 
 fun onOpenFileManager(context: Context) {
+    // future thoughts: Intent.ACTION_VIEW may not work on some devices
+    // the "correct" solution is to go through a list of possible intents/applications
+    // don't feel like writing that behavior. this is good enough
+
     val intent = Intent(Intent.ACTION_VIEW).apply {
-        addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+        data = DocumentsContract.buildRootUri(
-        type = "vnd.android.document/directory"
+            "${context.packageName}.user",
+            UserDirectoryProvider.ROOT
+        )
+
+        addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION or
+                Intent.FLAG_GRANT_WRITE_URI_PERMISSION or
+                Intent.FLAG_GRANT_PREFIX_URI_PERMISSION or
+                Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
+        )
     }
 
     try {

app/src/main/java/com/geode/launcher/UserDirectoryProvider.kt

@@ -11,8 +11,6 @@ import android.webkit.MimeTypeMap
 import com.geode.launcher.utils.LaunchUtils
 import java.io.File
 
-private const val ROOT = "root"
-
 private val DEFAULT_ROOT_PROJECTION: Array<String> = arrayOf(
     DocumentsContract.Root.COLUMN_ROOT_ID,
     DocumentsContract.Root.COLUMN_FLAGS,
@@ -30,7 +28,12 @@ private val DEFAULT_DOCUMENT_PROJECTION: Array<String> = arrayOf(
     DocumentsContract.Document.COLUMN_SIZE
 )
 
+// a lot of this code is pulled from <https://github.com/dolphin-emu/dolphin>
 class UserDirectoryProvider : DocumentsProvider() {
+    companion object {
+        internal const val ROOT = "root"
+    }
+
     private lateinit var rootDir: File
 
     override fun onCreate(): Boolean {