diff --git a/app/src/main/java/com/example/tampopo_client/views/MainActivity.java b/app/src/main/java/com/example/tampopo_client/views/MainActivity.java
index 237e7c0..21e3aae 100644
--- a/app/src/main/java/com/example/tampopo_client/views/MainActivity.java
+++ b/app/src/main/java/com/example/tampopo_client/views/MainActivity.java
@@ -14,6 +14,7 @@
 import android.widget.TextView;
 
 import androidx.activity.EdgeToEdge;
+import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.graphics.Insets;
 import androidx.core.view.ViewCompat;
@@ -27,7 +28,9 @@
     private ImageButton sendButton;
     private GridView wordGroup;
     private LinearLayout messageList;
-    private String[] words = {"そろそろ会いたいね〜", "今暇だよー", "勉強しよ〜", "ごはんいこ〜"};
+    //アクティビティの選択肢
+    private String[] words = {"ひまnow","あそぼ！","そろそろ会いたない〜？", "勉強なう", "電話しよ～", "お風呂入ってくる～","今暇だよー！","いそがしい～!!"};
+    private Button openDialogButton;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -67,44 +70,78 @@
 //            }
 //        });
 
-        editMessage = findViewById(R.id.editMessage);
-        sendButton = findViewById(R.id.sendButton);
-        wordGroup = findViewById(R.id.wordGroup);
         messageList = findViewById(R.id.messageList);
 
+        // ボタンを押すとダイアログ表示（トリガー用）
+        openDialogButton = findViewById(R.id.openDialogButton);
+        openDialogButton.setOnClickListener(v -> showInputDialog());
+
+    }
+    private void showInputDialog() {
+        // カスタムビュー読み込み
+        View dialogView = getLayoutInflater().inflate(R.layout.main_dialog, null);
+        EditText editTextInput = dialogView.findViewById(R.id.editTextInput);
+        GridView wordGrid = dialogView.findViewById(R.id.wordGrid);
+        ImageButton sendButton = dialogView.findViewById(R.id.sendButton);
+
         // 語群セット
         ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, words);
-        wordGroup.setAdapter(adapter);
+        wordGrid.setAdapter(adapter);
 
-        editMessage.setOnFocusChangeListener((v, hasFocus) -> {
-            if (hasFocus) {
-                wordGroup.setVisibility(View.GONE);
-            }
+        // 語群クリックで入力欄にセット
+        wordGrid.setOnItemClickListener((parent, view, position, id) -> {
+            editTextInput.setText(words[position]);
+            // 入力欄にフォーカス＆キーボード表示
+            editTextInput.requestFocus();
+            InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
+            imm.showSoftInput(editTextInput, InputMethodManager.SHOW_IMPLICIT);
         });
 
-        // 「あそぼ！」的なトリガータップ（ここでは GridView の表示で代用）
-        findViewById(R.id.editMessage).setOnClickListener(v -> {
-            wordGroup.setVisibility(View.VISIBLE);
-        });
-
-        // 語群から選択 → 入力欄にセット
-        wordGroup.setOnItemClickListener((parent, view, position, id) -> {
-            editMessage.setText(words[position]);
-            wordGroup.setVisibility(View.GONE);
-        });
+        // ダイアログ生成
+        AlertDialog dialog = new AlertDialog.Builder(this)
+                .setView(dialogView)
+                .create();
 
         // 送信ボタン処理
         sendButton.setOnClickListener(v -> {
-            String message = editMessage.getText().toString();
+            String message = editTextInput.getText().toString().trim();
+            int length = message.length();
             if (!message.isEmpty()) {
-                TextView textView = new TextView(this);
-                textView.setText(message);
-                textView.setPadding(10, 10, 10, 10);
-                textView.setBackgroundColor(Color.parseColor("#E0E0E0"));
-                messageList.addView(textView);
-
-                editMessage.setText("");
+                if(length > 20){
+                    openDialogButton.setTextSize(7);
+                }else if(length > 10){
+                    openDialogButton.setTextSize(10);
+                }else{
+                    openDialogButton.setTextSize(12);
+                }
+                openDialogButton.setMaxLines(10);
+                openDialogButton.setLineSpacing(4.0f,1.2f);
+                openDialogButton.setText(message);
+                editTextInput.setText("");
+                dialog.dismiss(); // ダイアログを閉じる
+            }else{
+                openDialogButton.setText("");
             }
         });
+
+        dialog.show();
+    }
+
+    private void addMessageToHome(String message) {
+        TextView textView = new TextView(this);
+        textView.setText(message);
+        textView.setPadding(10, 10, 10, 10);
+        textView.setBackgroundColor(Color.parseColor("#E0E0E0"));
+        int length = message.length();
+        if(length > 10){
+            textView.setTextSize(5);
+        }else if(length > 7){
+            textView.setTextSize(8);
+        }else{
+            textView.setTextSize(10);
+        }
+        textView.setMaxLines(10);
+        textView.setLineSpacing(4.0f,1.2f);
+        messageList.addView(textView);
     }
 }
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