diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9d982af..efeb69c 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -45,10 +45,6 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity
-            android:name=".AuthActivity"
-            android:theme="@style/Theme.OwnDroid">
-        </activity>
         <receiver
             android:name=".Receiver"
             android:description="@string/app_name"
diff --git a/app/src/main/java/com/bintianqi/owndroid/Auth.kt b/app/src/main/java/com/bintianqi/owndroid/Auth.kt
index a258b02..686f77e 100644
--- a/app/src/main/java/com/bintianqi/owndroid/Auth.kt
+++ b/app/src/main/java/com/bintianqi/owndroid/Auth.kt
@@ -2,60 +2,63 @@ package com.bintianqi.owndroid
 
 import android.annotation.SuppressLint
 import android.content.Context
-import android.content.Intent
 import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
 import android.widget.Toast
-import androidx.activity.compose.setContent
-import androidx.activity.enableEdgeToEdge
 import androidx.biometric.BiometricManager
 import androidx.biometric.BiometricPrompt
 import androidx.biometric.BiometricPrompt.AuthenticationCallback
+import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material3.Button
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.ComposeView
 import androidx.core.content.ContextCompat
-import androidx.core.view.WindowCompat
+import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentActivity
 import com.bintianqi.owndroid.ui.theme.OwnDroidTheme
 
-var authenticated = false
-
-class AuthActivity: FragmentActivity(){
+class AuthFragment: Fragment() {
     @SuppressLint("UnrememberedMutableState")
-    @OptIn(ExperimentalMaterial3Api::class)
-    override fun onCreate(savedInstanceState: Bundle?) {
-        enableEdgeToEdge()
-        WindowCompat.setDecorFitsSystemWindows(window, false)
-        super.onCreate(savedInstanceState)
-        val mainActivityIntent = Intent(applicationContext, MainActivity::class.java)
-        val sharedPref = applicationContext.getSharedPreferences("data", Context.MODE_PRIVATE)
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
+        val sharedPref = context?.getSharedPreferences("data", Context.MODE_PRIVATE)!!
+        val onAuthSucceed = {
+            val fragmentManager = this.parentFragmentManager
+            val fragment = fragmentManager.findFragmentByTag("auth")
+            if(fragment != null) {
+                val fragmentTransaction = fragmentManager.beginTransaction()
+                fragmentTransaction.replace(R.id.base, homeFragment)
+                fragmentTransaction.commit()
+            }
+        }
         val callback = object: AuthenticationCallback() {
             override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
                 super.onAuthenticationSucceeded(result)
-                authenticated = true
-                startActivity(mainActivityIntent)
-                finish()
+                onAuthSucceed()
             }
             override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
                 super.onAuthenticationError(errorCode, errString)
-                Toast.makeText(applicationContext, errString, Toast.LENGTH_SHORT).show()
-                /*if (errString.toString().isNotEmpty()) {
-                }*/
+                if(errorCode == BiometricPrompt.ERROR_NO_DEVICE_CREDENTIAL) onAuthSucceed()
+                if(errorCode == BiometricPrompt.ERROR_CANCELED) return
+                Toast.makeText(context, errString, Toast.LENGTH_SHORT).show()
             }
         }
-        setContent {
-            val materialYou = mutableStateOf(sharedPref.getBoolean("material_you",true))
-            val blackTheme = mutableStateOf(sharedPref.getBoolean("black_theme", false))
-            OwnDroidTheme(materialYou.value, blackTheme.value) {
-                Auth(this, callback)
+        return ComposeView(requireContext()).apply {
+            setContent {
+                val materialYou = mutableStateOf(sharedPref.getBoolean("material_you",true))
+                val blackTheme = mutableStateOf(sharedPref.getBoolean("black_theme", false))
+                OwnDroidTheme(materialYou.value, blackTheme.value) {
+                    Auth(this@AuthFragment.requireActivity(), callback)
+                }
             }
         }
     }
@@ -66,9 +69,9 @@ fun Auth(activity: FragmentActivity, callback: AuthenticationCallback) {
     Column(
         horizontalAlignment = Alignment.CenterHorizontally,
         verticalArrangement = Arrangement.Center,
-        modifier = Modifier.fillMaxSize()
+        modifier = Modifier.fillMaxSize().background(MaterialTheme.colorScheme.background)
     ){
-        Text(text = "Authenticate", style = MaterialTheme.typography.headlineLarge)
+        Text(text = "Authenticate", style = MaterialTheme.typography.headlineLarge, color = MaterialTheme.colorScheme.onBackground)
         Button(
             onClick = {
                 authWithBiometricPrompt(activity, callback)
diff --git a/app/src/main/java/com/bintianqi/owndroid/MainActivity.kt b/app/src/main/java/com/bintianqi/owndroid/MainActivity.kt
index 85fbf3a..c2e0a3c 100644
--- a/app/src/main/java/com/bintianqi/owndroid/MainActivity.kt
+++ b/app/src/main/java/com/bintianqi/owndroid/MainActivity.kt
@@ -4,12 +4,13 @@ import android.annotation.SuppressLint
 import android.app.admin.DevicePolicyManager
 import android.content.ComponentName
 import android.content.Context
-import android.content.Intent
 import android.os.Build.VERSION
 import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
 import android.widget.Toast
 import androidx.activity.ComponentActivity
-import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
@@ -28,12 +29,14 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.ComposeView
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.core.view.WindowCompat
+import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentActivity
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.NavHost
@@ -45,27 +48,39 @@ import com.bintianqi.owndroid.ui.theme.OwnDroidTheme
 import kotlinx.coroutines.delay
 import java.util.Locale
 
+val homeFragment = HomeFragment()
+
 var backToHome = false
 @ExperimentalMaterial3Api
 class MainActivity : FragmentActivity() {
     @SuppressLint("UnrememberedMutableState")
     override fun onCreate(savedInstanceState: Bundle?) {
-        if(!authenticated){
-            startActivity(Intent(applicationContext, AuthActivity::class.java))
-            finish()
-        }
+        registerActivityResult(this)
         enableEdgeToEdge()
         WindowCompat.setDecorFitsSystemWindows(window, false)
         super.onCreate(savedInstanceState)
-        registerActivityResult(this)
-        val locale = applicationContext.resources.configuration.locale
+        setContentView(R.layout.base)
+        val fragmentManager = supportFragmentManager
+        val transaction = fragmentManager.beginTransaction()
+        transaction.add(R.id.base, AuthFragment(), "auth")
+        transaction.commit()
+        val locale = applicationContext.resources?.configuration?.locale
         zhCN = locale==Locale.SIMPLIFIED_CHINESE||locale==Locale.CHINESE||locale==Locale.CHINA
-        val sharedPref = applicationContext.getSharedPreferences("data", Context.MODE_PRIVATE)
-        setContent {
-            val materialYou = mutableStateOf(sharedPref.getBoolean("material_you",true))
-            val blackTheme = mutableStateOf(sharedPref.getBoolean("black_theme", false))
-            OwnDroidTheme(materialYou.value, blackTheme.value){
-                MyScaffold(materialYou, blackTheme)
+    }
+}
+
+class HomeFragment: Fragment() {
+    @OptIn(ExperimentalMaterial3Api::class)
+    @SuppressLint("UnrememberedMutableState")
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
+        val sharedPref = context?.getSharedPreferences("data", Context.MODE_PRIVATE)!!
+        return ComposeView(requireContext()).apply {
+            setContent {
+                val materialYou = mutableStateOf(sharedPref.getBoolean("material_you",true))
+                val blackTheme = mutableStateOf(sharedPref.getBoolean("black_theme", false))
+                OwnDroidTheme(materialYou.value, blackTheme.value){
+                    MyScaffold(materialYou, blackTheme)
+                }
             }
         }
     }
diff --git a/app/src/main/res/layout/base.xml b/app/src/main/res/layout/base.xml
new file mode 100644
index 0000000..b6d7e67
--- /dev/null
+++ b/app/src/main/res/layout/base.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/base"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+</FrameLayout>