ADD file via upload

testing/AIFragment.java

@@ -0,0 +1,74 @@
+package com.example.doitnow;
+
+import android.os.Bundle;
+import android.view.Gravity;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.ScrollView;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+public class AIFragment extends Fragment {
+
+    private EditText userInput;
+    private Button sendButton;
+    private LinearLayout chatContainer;
+    private ScrollView scrollView;
+
+    @Nullable
+    @Override
+    public View onCreateView(@NonNull LayoutInflater inflater,
+                             @Nullable ViewGroup container,
+                             @Nullable Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.fragment_ai, container, false);
+
+        userInput = view.findViewById(R.id.user_input);
+        sendButton = view.findViewById(R.id.send_button);
+        chatContainer = view.findViewById(R.id.chat_container);
+        scrollView = view.findViewById(R.id.scrollView);
+
+        sendButton.setOnClickListener(v -> {
+            String inputText = userInput.getText().toString().trim();
+            if (!inputText.isEmpty()) {
+                addMessage(inputText, 0xFFE6D6F3,true); // 使用者
+                addMessage("暫未接入 AI", 0xFFF0F0F0,false); // AI
+                userInput.setText("");
+                scrollToBottom();
+            }
+        });
+
+        return view;
+    }
+
+    private void addMessage(String text, int backgroundColor,boolean alignRight) {
+        TextView messageView = new TextView(getContext());
+        messageView.setText(text);
+        messageView.setTextSize(16);
+        messageView.setPadding(20, 12, 20, 12);
+        messageView.setBackgroundColor(backgroundColor);
+
+        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
+                ViewGroup.LayoutParams.WRAP_CONTENT,
+                ViewGroup.LayoutParams.WRAP_CONTENT);
+        params.setMargins(0, 8, 0, 8);
+        if (alignRight){
+            params.gravity= Gravity.END;
+        }else{
+            params.gravity=Gravity.START;
+        }
+        messageView.setLayoutParams(params);
+
+        chatContainer.addView(messageView);
+    }
+
+    private void scrollToBottom() {
+        scrollView.post(() -> scrollView.fullScroll(View.FOCUS_DOWN));
+    }
+}