Implement file/folder opening along with link opening

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/MainActivity.java

@@ -20,6 +20,7 @@ import android.os.*;
 import android.provider.DocumentsContract;
 import android.util.*;
 import android.view.*;
+import android.webkit.MimeTypeMap;
 import android.widget.*;
 
 import androidx.annotation.NonNull;
@@ -508,12 +509,37 @@ public class MainActivity extends BaseActivity implements ControlButtonMenuListe
         b.show();
     }
 
+    private static void setUri(Context context, String input, Intent intent) {
+        if(input.startsWith("file:")) {
+            int truncLength = 5;
+            if(input.startsWith("file://")) truncLength = 7;
+            input = input.substring(truncLength);
+            Log.i("MainActivity", input);
+            boolean isDirectory = new File(input).isDirectory();
+            if(isDirectory) {
+                intent.setType(DocumentsContract.Document.MIME_TYPE_DIR);
+            }else{
+                String type = null;
+                String extension = MimeTypeMap.getFileExtensionFromUrl(input);
+                if(extension != null) type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
+                if(type == null) type = "*/*";
+                intent.setType(type);
+            }
+            intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
+            intent.setData(DocumentsContract.buildDocumentUri(
+                    context.getString(R.string.storageProviderAuthorities), input
+            ));
+            return;
+        }
+        intent.setDataAndType(Uri.parse(input), "*/*");
+    }
+
     public static void openLink(String link) {
         Context ctx = touchpad.getContext(); // no more better way to obtain a context statically
         ((Activity)ctx).runOnUiThread(() -> {
             try {
                 Intent intent = new Intent(Intent.ACTION_VIEW);
-                intent.setDataAndType(Uri.parse(link.replace("file://", "content://")), "*/*");
+                setUri(ctx, link, intent);
                 ctx.startActivity(intent);
             } catch (Throwable th) {
                 Tools.showError(ctx, th);

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/scoped/FolderProvider.java

@@ -1,16 +1,21 @@
 package net.kdt.pojavlaunch.scoped;
 
+import android.annotation.TargetApi;
 import android.content.res.AssetFileDescriptor;
 import android.database.Cursor;
 import android.database.MatrixCursor;
 import android.graphics.Point;
 import android.os.CancellationSignal;
 import android.os.ParcelFileDescriptor;
+import android.provider.DocumentsContract;
 import android.provider.DocumentsContract.Document;
 import android.provider.DocumentsContract.Root;
 import android.provider.DocumentsProvider;
+import android.util.Log;
 import android.webkit.MimeTypeMap;
 
+import androidx.annotation.Nullable;
+
 import net.kdt.pojavlaunch.R;
 import net.kdt.pojavlaunch.Tools;
 
@@ -19,8 +24,10 @@ import org.apache.commons.io.FileUtils;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.LinkedList;
+import java.util.List;
 
 /**
  * A document provider for the Storage Access Framework which exposes the files in the
@@ -183,6 +190,7 @@ public class FolderProvider extends DocumentsProvider {
 
     @Override
     public String getDocumentType(String documentId) throws FileNotFoundException {
+        Log.i("FolderPRovider", "getDocumentType("+documentId+")");
         File file = getFileForDocId(documentId);
         return getMimeType(file);
     }
@@ -300,4 +308,11 @@ public class FolderProvider extends DocumentsProvider {
         row.add(Document.COLUMN_ICON, R.mipmap.ic_launcher);
     }
 
+    @Override
+    @TargetApi(26)
+    public DocumentsContract.Path findDocumentPath(@Nullable String parentDocumentId, String childDocumentId) throws FileNotFoundException {
+        File source = BASE_DIR;
+        if(parentDocumentId != null) source = getFileForDocId(parentDocumentId);
+        return new DocumentsContract.Path(getDocIdForFile(source), Collections.singletonList(childDocumentId));
+    }
 }

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/tasks/AsyncMinecraftDownloader.java

@@ -93,7 +93,8 @@ public class AsyncMinecraftDownloader {
             }
 
             try {
-                assets = downloadIndex(verInfo, new File(Tools.ASSETS_PATH, "indexes/" + verInfo.assets + ".json"));
+                if(verInfo.assets != null)
+                    assets = downloadIndex(verInfo, new File(Tools.ASSETS_PATH, "indexes/" + verInfo.assets + ".json"));
             } catch (IOException e) {
                 Log.e("AsyncMcDownloader", e.toString(), e);
                 throw new DownloaderException(e);
@@ -199,7 +200,8 @@ public class AsyncMinecraftDownloader {
 
 
         try {
-            downloadAssets(assets, verInfo.assets, assets.mapToResources ? new File(Tools.OBSOLETE_RESOURCES_PATH) : new File(Tools.ASSETS_PATH));
+            if(assets != null)
+                downloadAssets(assets, verInfo.assets, assets.mapToResources ? new File(Tools.OBSOLETE_RESOURCES_PATH) : new File(Tools.ASSETS_PATH));
         } catch (Exception e) {
             Log.e("AsyncMcDownloader", e.toString(), e);
             ProgressKeeper.submitProgress(ProgressLayout.DOWNLOAD_MINECRAFT, -1, -1);