diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 4f15509..a785cf2 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools" >
+    xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.NFC" />
     <uses-permission android:name="android.permission.NFC_TRANSACTION_EVENT" />
@@ -8,52 +8,65 @@
     <application
         android:name=".GlobalVar"
         android:allowBackup="true"
-        android:extractNativeLibs="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
+        android:extractNativeLibs="true"
         android:fullBackupContent="@xml/backup_rules"
         android:icon="@drawable/aic_fill"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/Theme.AICEmu"
-        tools:targetApi="31" >
-
-        <meta-data
-            android:name="xposedmodule"
-            android:value="true" />
-        <meta-data
-            android:name="xposedminversion"
-            android:value="30" />
-        <meta-data
-            android:name="xposeddescription"
-            android:value="Emulate Every AIC Card" />
-        <meta-data
-            android:name="xposedscope"
-            android:resource="@array/xposed_scope" />
+        tools:targetApi="31">
 
         <activity
             android:name=".MainActivity"
             android:exported="true"
-            android:theme="@style/Theme.AICEmu" >
+            android:theme="@style/Theme.AICEmu">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
+
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-
         <activity
             android:name=".ReadCard"
             android:theme="@style/CardActivityTheme" />
-
         <activity
             android:name=".SettingActivity"
             android:exported="false"
             android:label="@string/title_activity_setting"
             android:theme="@style/Theme.AICEmuActionBar" />
 
+        <meta-data
+            android:name="xposedscope"
+            android:resource="@array/xposed_scope" />
+        <meta-data
+            android:name="xposedmodule"
+            android:value="true" />
+        <meta-data
+            android:name="xposedminversion"
+            android:value="93" />
+        <meta-data
+            android:name="xposeddescription"
+            android:value="Emulate Every AIC Card" />
+        <meta-data
+            android:name="xposedsharedprefs"
+            android:value="true" />
+
+        <service
+            android:name=".ApduService"
+            android:exported="true"
+            android:permission="android.permission.BIND_NFC_SERVICE">
+            <intent-filter>
+                <action android:name="android.nfc.cardemulation.action.HOST_APDU_SERVICE" />
+            </intent-filter>
+            <meta-data
+                android:name="android.nfc.cardemulation.host_apdu_service"
+                android:resource="@xml/apdu_service" />
+        </service>
         <service
             android:name=".EmuCard"
             android:exported="true"
-            android:permission="android.permission.BIND_NFC_SERVICE" >
+            android:permission="android.permission.BIND_NFC_SERVICE">
             <intent-filter>
                 <action android:name="android.nfc.cardemulation.action.HOST_NFCF_SERVICE" />
             </intent-filter>
@@ -61,6 +74,5 @@
                 android:name="android.nfc.cardemulation.host_nfcf_service"
                 android:resource="@xml/host_nfcf_service" />
         </service>
-
     </application>
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/moe/tqlwsl/aicemu/ApduService.kt b/app/src/main/java/moe/tqlwsl/aicemu/ApduService.kt
new file mode 100644
index 0000000..0809bd1
--- /dev/null
+++ b/app/src/main/java/moe/tqlwsl/aicemu/ApduService.kt
@@ -0,0 +1,16 @@
+package moe.tqlwsl.aicemu
+
+import android.nfc.cardemulation.HostApduService
+import android.os.Bundle
+
+
+class ApduService : HostApduService() {
+    override fun onDeactivated(reason: Int) {
+        // placeholder
+    }
+
+    override fun processCommandApdu(commandApdu: ByteArray, extras: Bundle): ByteArray {
+        // placeholder
+        return ByteArray(0)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/moe/tqlwsl/aicemu/MainActivity.kt b/app/src/main/java/moe/tqlwsl/aicemu/MainActivity.kt
index db4709d..aa7f923 100644
--- a/app/src/main/java/moe/tqlwsl/aicemu/MainActivity.kt
+++ b/app/src/main/java/moe/tqlwsl/aicemu/MainActivity.kt
@@ -4,6 +4,7 @@ import android.app.AlertDialog
 import android.app.PendingIntent
 import android.content.*
 import android.nfc.NfcAdapter
+import android.nfc.cardemulation.CardEmulation
 import android.nfc.cardemulation.NfcFCardEmulation
 import android.os.Bundle
 import android.util.Log
@@ -12,16 +13,14 @@ import android.widget.*
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.Toolbar
 import androidx.cardview.widget.CardView
-import androidx.core.content.edit
 import androidx.core.view.WindowCompat
 import com.google.android.material.floatingactionbutton.FloatingActionButton
 import com.google.gson.Gson
 import com.google.gson.JsonSyntaxException
 import com.google.gson.reflect.TypeToken
+import moe.tqlwsl.aicemu.databinding.ActivityMainBinding
 import java.io.File
 import java.io.IOException
-import moe.tqlwsl.aicemu.databinding.ActivityMainBinding
-
 
 
 internal data class Card(val name: String, val idm: String)
@@ -83,6 +82,18 @@ class MainActivity : AppCompatActivity() {
             return
         }
 
+        // set default payment app
+        var cardEmulation = CardEmulation.getInstance(nfcAdapter)
+        val componentName = ComponentName(applicationContext, ApduService::class.java)
+        val isDefault =
+            cardEmulation.isDefaultServiceForCategory(componentName, CardEmulation.CATEGORY_PAYMENT)
+        if (!isDefault) {
+            val intent = Intent(CardEmulation.ACTION_CHANGE_DEFAULT)
+            intent.putExtra(CardEmulation.EXTRA_CATEGORY, CardEmulation.CATEGORY_PAYMENT)
+            intent.putExtra(CardEmulation.EXTRA_SERVICE_COMPONENT, componentName)
+            startActivity(intent)
+        }
+
         // add pendingintent in order not to read tag at home
         val intent = Intent(this, javaClass).apply {
             addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
@@ -98,7 +109,7 @@ class MainActivity : AppCompatActivity() {
         )
 
         // setting prefs
-        prefs = applicationContext.getSharedPreferences("AICEmu", MODE_PRIVATE)
+        prefs = applicationContext.getSharedPreferences("AICEmu", Context.MODE_WORLD_READABLE)
         currentCardId = prefs.getInt("currentCardId", -1)
         compatibleID = prefs.getBoolean("compatibleID", false)
         val compatibleButton: Button = findViewById(R.id.button_compatible)
@@ -176,7 +187,7 @@ class MainActivity : AppCompatActivity() {
                 true
             }
             R.id.toolbar_menu_settings -> {
-                Toast.makeText(applicationContext, "还没做完（）\nUnder constuction...", Toast.LENGTH_LONG).show()
+                // Toast.makeText(applicationContext, "还没做完（）\nUnder constuction...", Toast.LENGTH_LONG).show()
                 val settingIntent = Intent(this, SettingActivity::class.java)
                 startActivity(settingIntent)
                 true
diff --git a/app/src/main/res/xml/apdu_service.xml b/app/src/main/res/xml/apdu_service.xml
new file mode 100644
index 0000000..9d682b4
--- /dev/null
+++ b/app/src/main/res/xml/apdu_service.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<host-apdu-service xmlns:android="http://schemas.android.com/apk/res/android"
+    android:apduServiceBanner="@drawable/aic_fill"
+    android:description="@string/apdu_service_desc"
+    android:requireDeviceUnlock="false" >
+    <aid-group
+        android:category="payment"
+        android:description="@string/apdu_service_desc" >
+        <aid-filter android:name="F0010203040506" />
+    </aid-group>
+</host-apdu-service>
\ No newline at end of file