diff --git a/code/AndroidManifest.xml b/code/AndroidManifest.xml
new file mode 100644
index 0000000..1e61f90
--- /dev/null
+++ b/code/AndroidManifest.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.tooth">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Tooth">
+        <activity
+            android:name=".SplashActivity"
+            android:exported="true"
+            android:theme="@android:style/Theme.NoTitleBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file
diff --git a/code/MainActivity.java b/code/MainActivity.java
new file mode 100644
index 0000000..8de1ecf
--- /dev/null
+++ b/code/MainActivity.java
@@ -0,0 +1,14 @@
+package com.example.tooth;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+
+public class MainActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+    }
+}
\ No newline at end of file
diff --git a/code/SplashActivity.java b/code/SplashActivity.java
new file mode 100644
index 0000000..25a3d64
--- /dev/null
+++ b/code/SplashActivity.java
@@ -0,0 +1,30 @@
+package com.example.tooth;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Handler;
+import android.view.WindowManager;
+
+public class SplashActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_splash);
+        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
+                WindowManager.LayoutParams.FLAG_FULLSCREEN);
+        new Handler().postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                Intent mainIntent = new Intent(SplashActivity.this, MainActivity.class);
+                startActivity(mainIntent);
+                finish();
+ /* overridePendingTransition(R.anim.mainfadein,
+ R.anim.splashfadeout);*/
+            }
+        }, 3000);
+    }
+}
+
diff --git a/code/activity_main.xml b/code/activity_main.xml
new file mode 100644
index 0000000..4fc2444
--- /dev/null
+++ b/code/activity_main.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.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=".MainActivity">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hello World!"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/code/activity_splash.xml b/code/activity_splash.xml
new file mode 100644
index 0000000..e272701
--- /dev/null
+++ b/code/activity_splash.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.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=".SplashActivity">
+    <RelativeLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+        <ImageView
+            android:layout_width="fill_parent"
+            android:layout_height="fill_parent"
+            android:id="@+id/splash"
+            android:src="@drawable/splash"
+            android:layout_alignParentTop="true"
+            android:layout_alignParentStart="true"
+            android:layout_alignParentLeft="true"/>
+    </RelativeLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/code/wenjuan b/code/wenjuan
deleted file mode 100644
index f7f13b3..0000000
--- a/code/wenjuan
+++ /dev/null
@@ -1 +0,0 @@
-qqqqq
\ No newline at end of file