diff --git a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
deleted file mode 100644
index 2fed0e0..0000000
--- a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
+++ /dev/null
@@ -1,46 +0,0 @@
-package com.example.cosmosclient.views;
-
-import android.content.Intent;
-import android.support.v7.app.AppCompatActivity;
-import android.os.Bundle;
-import android.view.View;
-import android.widget.Button;
-import android.widget.EditText;
-
-import com.example.cosmosclient.R;
-
-public class SigninActivity extends AppCompatActivity {
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_signin);
-
-        //各種IDを取得
-        Button SigninButton = findViewById(R.id.SigninButton);
-        Button SignupButton = findViewById(R.id.SignupButton);
-        EditText EmailAddressText = findViewById(R.id.EMailAddressText);
-        EditText PasswordText = findViewById(R.id.PasswordText);
-        Button ForgotPasswordButton = findViewById(R.id.ForgotPasswordButton);
-
-        //Sign inボタンの処理
-        SigninButton.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                Intent intent = new Intent(getApplication(), GroupList.class);
-                startActivity(intent);
-                finish();
-            }
-        });
-
-        //サインアップ画面への遷移処理
-        SignupButton.setOnClickListener(new View.OnClickListener(){
-            @Override
-            public void onClick(View v){
-                Intent intent = new Intent(getApplication(), SignupActivity.class);
-                startActivity(intent);
-                finish();
-            }
-        });
-    }
-}
diff --git a/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java b/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
deleted file mode 100644
index c738fa8..0000000
--- a/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.example.cosmosclient.views;
-
-import android.content.Intent;
-import android.support.v7.app.AppCompatActivity;
-import android.os.Bundle;
-import android.view.View;
-import android.widget.Button;
-import android.widget.EditText;
-
-import com.example.cosmosclient.R;
-
-public class SignupActivity extends AppCompatActivity {
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_signup);
-
-        //各種idを取得
-        Button LoginButton = findViewById(R.id.LoginButton);
-        Button MakeAccountButton = findViewById(R.id.MakeAccountButton);
-        EditText EmailAddressText = findViewById(R.id.EMailAddressText);
-        EditText PasswordText = findViewById(R.id.PasswordText);
-        EditText ConfirmPasswordText = findViewById(R.id.ConfirmPasswordText);
-
-        //Make Accountボタンの処理
-        MakeAccountButton.setOnClickListener(new View.OnClickListener(){
-            @Override
-            public void onClick(View v){
-                Intent intent = new Intent(getApplication(), GroupList.class);
-                startActivity(intent);
-                finish();
-            }
-        });
-
-        //サインイン画面への遷移処理
-        LoginButton.setOnClickListener(new View.OnClickListener(){
-            @Override
-            public void onClick(View v){
-                Intent intent = new Intent(getApplication(),SigninActivity.class);
-                startActivity(intent);
-                finish();
-            }
-        });
-
-    }
-}
diff --git a/app/src/main/res/layout/activity_signin.xml b/app/src/main/res/layout/activity_signin.xml
deleted file mode 100644
index 7416c05..0000000
--- a/app/src/main/res/layout/activity_signin.xml
+++ /dev/null
@@ -1,156 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".views.SigninActivity">
-
-    <Button
-        android:id="@+id/SigninButton"
-        android:layout_width="294dp"
-        android:layout_height="66dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="28dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:text="@string/sign_in"
-        android:textAllCaps="false"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.445"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/PasswordText" />
-
-    <EditText
-        android:id="@+id/PasswordText"
-        android:layout_width="294dp"
-        android:layout_height="41dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="16dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:autofillHints=""
-        android:ems="10"
-        android:hint="@string/password"
-        android:inputType="textPassword"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.445"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/EMailAddressText" />
-
-    <EditText
-        android:id="@+id/EMailAddressText"
-        android:layout_width="294dp"
-        android:layout_height="41dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="16dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:autofillHints=""
-        android:ems="10"
-        android:hint="@string/e_mail_address"
-        android:inputType="textEmailAddress"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.445"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/textView2" />
-
-    <TextView
-        android:id="@+id/textView2"
-        android:layout_width="78dp"
-        android:layout_height="31dp"
-        android:layout_marginStart="16dp"
-        android:layout_marginLeft="16dp"
-        android:layout_marginTop="72dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:text="@string/sign_in"
-        android:textAllCaps="false"
-        android:textSize="20sp"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.119"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
-
-    <TextView
-        android:id="@+id/textView3"
-        android:layout_width="155dp"
-        android:layout_height="21dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:text="@string/don_t_have_an_account"
-        app:layout_constraintEnd_toStartOf="@+id/SignupButton"
-        app:layout_constraintHorizontal_bias="0.569"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="@+id/SignupButton" />
-
-    <Button
-        android:id="@+id/SignupButton"
-        style="@android:style/Widget.DeviceDefault.Button.Borderless"
-        android:layout_width="95dp"
-        android:layout_height="21dp"
-        android:layout_gravity="left|top"
-        android:layout_marginTop="8dp"
-        android:layout_marginEnd="64dp"
-        android:layout_marginRight="64dp"
-        android:background="#00000000"
-        android:text="@string/sign_up_now"
-        android:textAllCaps="false"
-        android:textColor="#3F51B5"
-        android:textSize="14sp"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/textView4" />
-
-    <View
-        android:layout_width="match_parent"
-        android:layout_height="1dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="50dp"
-        android:layout_marginTop="32dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="50dp"
-        android:background="@android:color/darker_gray"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.0"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/SigninButton" />
-
-    <TextView
-        android:id="@+id/textView4"
-        android:layout_width="37dp"
-        android:layout_height="28dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="20dp"
-        android:background="#FFFFFF"
-        android:gravity="center"
-        android:text="@string/or"
-        android:textSize="18sp"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.489"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/SigninButton" />
-
-    <Button
-        android:id="@+id/ForgotPasswordButton"
-        style="@android:style/Widget.DeviceDefault.Button.Borderless"
-        android:layout_width="115dp"
-        android:layout_height="18dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="4dp"
-        android:background="#00000000"
-        android:text="@string/forgot_password"
-        android:textAllCaps="false"
-        android:textColor="#3F51B5"
-        android:textSize="14sp"
-        app:layout_constraintStart_toStartOf="@+id/PasswordText"
-        app:layout_constraintTop_toBottomOf="@+id/PasswordText" />
-
-
-</android.support.constraint.ConstraintLayout>
diff --git a/app/src/main/res/layout/activity_signup.xml b/app/src/main/res/layout/activity_signup.xml
deleted file mode 100644
index 3088668..0000000
--- a/app/src/main/res/layout/activity_signup.xml
+++ /dev/null
@@ -1,154 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".views.SignupActivity">
-
-    <TextView
-        android:id="@+id/textView6"
-        android:layout_width="155dp"
-        android:layout_height="21dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:text="@string/already_have_a_account"
-        app:layout_constraintEnd_toStartOf="@+id/LoginButton"
-        app:layout_constraintHorizontal_bias="0.562"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="@+id/LoginButton" />
-
-    <Button
-        android:id="@+id/LoginButton"
-        style="@android:style/Widget.DeviceDefault.Button.Borderless"
-        android:layout_width="44dp"
-        android:layout_height="21dp"
-        android:layout_gravity="left|top"
-        android:layout_marginTop="8dp"
-        android:layout_marginEnd="116dp"
-        android:layout_marginRight="116dp"
-        android:background="#00000000"
-        android:textAllCaps="false"
-        android:text="@string/login"
-        android:textColor="#3F51B5"
-        android:textSize="14sp"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/textView5" />
-
-    <View
-        android:layout_width="match_parent"
-        android:layout_height="1dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="50dp"
-        android:layout_marginTop="32dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="50dp"
-        android:background="@android:color/darker_gray"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.0"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/MakeAccountButton" />
-
-    <TextView
-        android:id="@+id/textView5"
-        android:layout_width="37dp"
-        android:layout_height="28dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="20dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:background="#FFFFFF"
-        android:gravity="center"
-        android:text="@string/or"
-        android:textSize="18sp"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.498"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/MakeAccountButton" />
-
-    <Button
-        android:id="@+id/MakeAccountButton"
-        android:layout_width="294dp"
-        android:layout_height="66dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="16dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:textAllCaps="false"
-        android:text="@string/make_account"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.445"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/ConfirmPasswordText" />
-
-    <EditText
-        android:id="@+id/ConfirmPasswordText"
-        android:layout_width="294dp"
-        android:layout_height="41dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="16dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:ems="10"
-        android:hint="@string/confirm_password"
-        android:inputType="textPassword"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.445"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/PasswordText" />
-
-    <EditText
-        android:id="@+id/PasswordText"
-        android:layout_width="294dp"
-        android:layout_height="41dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="16dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:ems="10"
-        android:hint="@string/password"
-        android:inputType="textPassword"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.445"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/EMailAddressText" />
-
-    <EditText
-        android:id="@+id/EMailAddressText"
-        android:layout_width="294dp"
-        android:layout_height="41dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginTop="16dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:ems="10"
-        android:hint="@string/e_mail_address"
-        android:inputType="textEmailAddress"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.445"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/textView2" />
-
-    <TextView
-        android:id="@+id/textView2"
-        android:layout_width="78dp"
-        android:layout_height="31dp"
-        android:layout_marginStart="16dp"
-        android:layout_marginLeft="16dp"
-        android:layout_marginTop="72dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
-        android:text="@string/sign_up"
-        android:textSize="20sp"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.119"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file