feat: 로컬 파일 복사/잘라내기/붙여넣기 기능 구현

app/src/main/java/be/gyu/android/file/explorer/MainActivity.java

@@ -3,6 +3,12 @@ package be.gyu.android.file.explorer;
 // ... (imports)
 
 import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.channels.FileChannel;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -14,103 +20,94 @@ public class MainActivity extends AppCompatActivity implements FileAdapter.OnIte
     private List<FileItem> clipboard = new ArrayList<>();
     private boolean isCutOperation = false;
 
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        // ... (onCreate remains the same)
-    }
-
-    // ... (Action Mode methods)
-
-    private final ActionMode.Callback actionModeCallback = new ActionMode.Callback() {
-        @Override
-        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
-            MenuInflater inflater = mode.getMenuInflater();
-            inflater.inflate(R.menu.context_menu_local, menu);
-            return true;
-        }
-
-        @Override
-        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
-            MenuItem renameItem = menu.findItem(R.id.action_rename);
-            renameItem.setVisible(fileAdapter.getSelectedItemCount() == 1);
-            return true;
-        }
-
-        @Override
-        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
-            int itemId = item.getItemId();
-            if (itemId == R.id.action_copy) {
-                copyToClipboard();
-                mode.finish();
-                return true;
-            } else if (itemId == R.id.action_cut) {
-                cutToClipboard();
-                mode.finish();
-                return true;
-            } else if (itemId == R.id.action_delete) {
-                showDeleteConfirmationDialog();
-                mode.finish();
-                return true;
-            } else if (itemId == R.id.action_rename) {
-                showRenameDialog();
-                mode.finish();
-                return true;
-            }
-            return false;
-        }
-
-        @Override
-        public void onDestroyActionMode(ActionMode mode) {
-            actionMode = null;
-            fileAdapter.clearSelections();
-        }
-    };
-
-    private void copyToClipboard() {
-        clipboard.clear();
-        clipboard.addAll(fileAdapter.getSelectedItems());
-        isCutOperation = false;
-        Toast.makeText(this, clipboard.size() + " items copied", Toast.LENGTH_SHORT).show();
-        invalidateOptionsMenu(); // To show paste button
-    }
-
-    private void cutToClipboard() {
-        clipboard.clear();
-        clipboard.addAll(fileAdapter.getSelectedItems());
-        isCutOperation = true;
-        Toast.makeText(this, clipboard.size() + " items cut", Toast.LENGTH_SHORT).show();
-        invalidateOptionsMenu(); // To show paste button
-    }
-
-    // ... (Delete and Rename methods)
+    // ... (onCreate and Action Mode methods)
 
     // --- Menu Methods ---
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.main_menu, menu);
-        // Show paste button only if there's something in the clipboard
-        MenuItem pasteItem = menu.findItem(R.id.action_paste);
-        pasteItem.setVisible(!clipboard.isEmpty());
         return true;
     }
 
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        // Show paste button only if there's something in the clipboard and not in remote mode
+        MenuItem pasteItem = menu.findItem(R.id.action_paste);
+        pasteItem.setVisible(!clipboard.isEmpty() && !isRemoteMode);
+        return super.onPrepareOptionsMenu(menu);
+    }
+
     @Override
     public boolean onOptionsItemSelected(@NonNull MenuItem item) {
         int itemId = item.getItemId();
         if (itemId == R.id.action_paste) {
-            // TODO: Implement paste logic
-            Toast.makeText(this, "Paste clicked", Toast.LENGTH_SHORT).show();
-            return true;
-        } else if (itemId == R.id.select_storage) {
-            showStorageSelectionDialog();
-            return true;
-        } else if (itemId == R.id.remote_storage) {
-            Intent intent = new Intent(this, RemoteStorageActivity.class);
-            startActivity(intent);
+            pasteFiles();
             return true;
         } 
+        // ... (other menu items)
         return super.onOptionsItemSelected(item);
     }
 
+    // --- File Operation Methods ---
+    
+    private void pasteFiles() {
+        if (clipboard.isEmpty()) return;
+
+        Toast.makeText(this, "Pasting " + clipboard.size() + " items...", Toast.LENGTH_SHORT).show();
+
+        new Thread(() -> {
+            int successCount = 0;
+            for (FileItem item : clipboard) {
+                File sourceFile = new File(item.getPath());
+                File destFile = new File(currentDirectory, sourceFile.getName());
+
+                try {
+                    if (isCutOperation) {
+                        if (sourceFile.renameTo(destFile)) {
+                            successCount++;
+                        }
+                    } else {
+                        copyFileOrDirectory(sourceFile, destFile);
+                        successCount++;
+                    }
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+
+            int finalSuccessCount = successCount;
+            runOnUiThread(() -> {
+                Toast.makeText(this, finalSuccessCount + " items pasted.", Toast.LENGTH_SHORT).show();
+                clipboard.clear();
+                isCutOperation = false;
+                invalidateOptionsMenu(); // Hide paste button
+                loadFiles(currentDirectory); // Refresh list
+            });
+        }).start();
+    }
+
+    private void copyFileOrDirectory(File source, File dest) throws IOException {
+        if (source.isDirectory()) {
+            if (!dest.exists()) {
+                dest.mkdirs();
+            }
+            String[] files = source.list();
+            if (files != null) {
+                for (String file : files) {
+                    copyFileOrDirectory(new File(source, file), new File(dest, file));
+                }
+            }
+        } else {
+            try (InputStream in = new FileInputStream(source);
+                 OutputStream out = new FileOutputStream(dest)) {
+                byte[] buffer = new byte[1024];
+                int length;
+                while ((length = in.read(buffer)) > 0) {
+                    out.write(buffer, 0, length);
+                }
+            }
+        }
+    }
+    
     // ... (rest of the file remains the same)
 }