Update MainActivity.java

Author: Zenlua

app/src/main/java/com/example/rootfilepicker/MainActivity.java

@@ -23,14 +23,14 @@
 public class MainActivity extends AppCompatActivity {
     private List<String> fileFilter = new ArrayList<>();
     private String typeUri = "path";
-        private static final int PERMISSION_REQUEST_CODE = 1;
+    private static final int PERMISSION_REQUEST_CODE = 1;
     private ListView listView;
     private File currentDirectory;
     private TextView tvCurrentPath;
     private FileListAdapter adapter;
     private final List<FileItem> fileItems = new ArrayList<>();
     private final List<FileItem> selectedItems = new ArrayList<>();
-    
+    private final String fileFilter = ""; // ví dụ: ".txt"
     private List<String> extensionFilter = new ArrayList<>();
 
     @Override
@@ -45,7 +45,7 @@ protected void onCreate(Bundle savedInstanceState) {
             }
         }
                 typeUri = intent.getStringExtra("type_uri");
-        
+
         }
         super.onCreate(savedInstanceState);
     // Lưu khi app thoát
@@ -100,7 +100,7 @@ protected void onCreate(Bundle savedInstanceState) {
 
         btnSave.setOnClickListener(v -> {
     saveSelectedPaths();
-    finish(); // Thoát app sau khi lưu
+    finish();
 });
 
         if (checkPermission()) {