Custom Activity create 2 icons on on android screen

Hi, I am new in Unity and Android.

I try to make a custom Activity extends from UnityPlayerActivity. I created a aar module in Android Studio.

Package name in Unity settings is com.yd.ghost, and aar package name is com.yd.ghostplugin

The AndroidManifest.xml in aar module is

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.yd.ghostplugin">
     <application android:icon="@drawable/app_icon" android:label="@string/app_name">
         <activity android:name=".MainActivity"
             android:label="@string/app_name"
             android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
             <intent-filter>
             </intent-filter>
         </activity>
     </application>
 </manifest>

Maybe the AndroidManifest in aar module is not related to this issue, I am not sure. Then I build the aar and put it in project folder /Assets/Plugins/Android. And put another AndroidManifest.xml in the same folder

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.yd.ghostplugin" xmlns:tools="http://schemas.android.com/tools" android:versionName="0.3" android:versionCode="34" android:installLocation="preferExternal">
   <supports-screens android:smallScreens="true" android:normalScreens="true" android:largeScreens="true" android:xlargeScreens="true" android:anyDensity="true" />
   <application android:theme="@style/UnityThemeSelector" 
                android:icon="@drawable/app_icon"
                android:label="@string/app_name"
                android:isGame="true"
                android:banner="@drawable/app_banner">
     <activity android:label="@string/app_name" 
               android:screenOrientation="landscape" 
               android:launchMode="singleTask" 
               android:configChanges="mcc|mnc|locale|touchscreen|keyboard|keyboardHidden|navigation|orientation|screenLayout|uiMode|screenSize|smallestScreenSize|fontScale|layoutDirection|density" android:hardwareAccelerated="false" 
               android:name=".MainActivity">
       <intent-filter>
         <action android:name="android.intent.action.MAIN" />
         <category android:name="android.intent.category.LAUNCHER" />
         <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
       </intent-filter>
       <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
     </activity>
     <meta-data android:name="unity.build-id" android:value="06d5277a-aa20-4424-91cd-8ea71291f3d6" />
     <meta-data android:name="unity.splash-mode" android:value="0" />
     <meta-data android:name="unity.splash-enable" android:value="True" />
     <meta-data android:name="android.max_aspect" android:value="2.1" />
   </application>
   <uses-sdk android:minSdkVersion="17" android:targetSdkVersion="25" />
   <uses-feature android:glEsVersion="0x00020000" />
   <supports-gl-texture android:name="GL_OES_compressed_ETC1_RGB8_texture" />
   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="18" />
   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="18" />
   <uses-feature android:name="android.hardware.sensor.accelerometer" android:required="false" />
   <uses-feature android:name="android.hardware.touchscreen" android:required="false" />
   <uses-feature android:name="android.hardware.touchscreen.multitouch" android:required="false" />
   <uses-feature android:name="android.hardware.touchscreen.multitouch.distinct" android:required="false" />
 </manifest>

And I got 2 icons on the screen. I try to google, and get the answer: you need to remove these lines

             <action android:name="android.intent.action.MAIN" />
             <category android:name="android.intent.category.LAUNCHER" />

But if I remove these lines, build failed.