how can i merge two android manifest.xml files?

I use two plugins in my project. Both of them have androidmainfest.xml at the same path. Problem accurs. How can I merge them into one? I copy the content here, wish someone can help me. Thanks a lot!!!

<meta-data android:name="com.google.android.gms.games.APP_ID" android:value="@string/app_id" />
<meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
<meta-data android:name="com.google.android.gms.appstate.APP_ID" android:value="@string/app_id" />

<activity android:name="cn.sharesdk.unity3d.demo.MainActivity" android:configChanges="keyboardHidden|orientation|screenSize" android:windowSoftInputMode="adjustPan|stateHidden">
  <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
 </activity>

 <activity android:name="cn.sharesdk.framework.ShareSDKUIShell" android:configChanges="keyboardHidden|orientation|screenSize" android:theme="@android:style/Theme.Translucent.NoTitleBar" android:windowSoftInputMode="stateHidden|adjustResize">
  <intent-filter>
    <data android:scheme="tencent100371282" />
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.BROWSABLE" />
    <category android:name="android.intent.category.DEFAULT" />
  </intent-filter>
</activity>


<activity android:name="com.android.AndroidNativeBridge" android:label="@string/app_name" 
    android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen" 
    android:launchMode="singleTask" android:screenOrientation="portrait"  tools:merge="override">
  
  <intent-filter>
    ***<!--action android:name="android.intent.action.MAIN" /-->***/////////////if I open the sentence here there will be two icons appear after installing our project apk file. But if I leave it like this, the sharing to other platforms function does not work!!!!
    <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
  
  <intent-filter>
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <category android:name="android.intent.category.BROWSABLE" />
    <data android:scheme="oauth" android:host="androidnative" />
  </intent-filter>
  <meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true" />
</activity>

<activity android:name="com.facebook.unity.FBUnityLoginActivity" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen" android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen">
</activity>
<activity android:name="com.facebook.LoginActivity" android:screenOrientation="portrait" android:configChanges="keyboardHidden|orientation" android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen">
</activity>
<activity android:name="com.facebook.unity.FBUnityDeepLinkingActivity" android:exported="true">
</activity>
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="\ 855824361110459" />



<activity android:name="com.unity3d.player.UnityPlayerActivity" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
</activity>

<activity android:name="com.unity3d.player.UnityPlayerNativeActivity" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
  <meta-data android:name="android.app.lib_name" android:value="unity" />
  <meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="false" />
</activity>

<activity android:name="com.google.android.gms.ads.AdActivity" android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" />
<receiver android:name="com.unionassets.android.plugin.GcmBroadcastReceiver" android:permission="com.google.android.c2dm.permission.SEND">
  <intent-filter>
    <action android:name="com.google.android.c2dm.intent.RECEIVE" />
    <category android:name="com.example.gcm" />
  </intent-filter>
</receiver>
<service android:name="com.unionassets.android.plugin.GcmIntentService" />
<activity android:name="com.facebook.LoginActivity" android:screenOrientation="portrait" android:configChanges="keyboardHidden|orientation">
</activity>
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="\ 395891937214418" />
<activity android:name="com.facebook.unity.FBUnityLoginActivity" android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen">
</activity>
<activity android:name="com.facebook.unity.FBUnityDeepLinkingActivity" android:exported="true">
</activity>



<receiver android:exported="true" android:name="com.android.gcm.GcmBroadcastReceiver" android:permission="com.google.android.c2dm.permission.SEND" >
  <intent-filter>
    <action android:name="com.google.android.c2dm.intent.RECEIVE" />
    <category android:name="REPLACE_WITH_BUNDLE_IDENTIFIER" />
  </intent-filter>
</receiver>

<service android:name="com.android.gcm.GcmIntentService" />

Nice question, dude!

Declare your manifest header like this:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

And then add one of the following appropriate attributes to the relevant Activity(s):

tools:merge="override"
tools:merge="remove"

I’ve found the method, it says:

To be able to do this you should have at least one plugin with full open source and source eclipse project. Android Native Plugin comes with full open source and eclipse source project.

For example you have another plugin you want to use with Android Native Plugin.
Open Android Native Eclipse project.
Add Other Plugin jar file to the project
Extend AndroidNativeBridge from other plugin Activity class.
Rebuild androidnative.jar and replace it in your project

After this step both plugin should work correctly.

And I tried to find the jar file:
package cn.sharesdk.unity3d.demo;

import android.os.Bundle;
import cn.sharesdk.unity3d.ShareSDKUtils;
import com.unity3d.player.UnityPlayerActivity;

public class MainActivity extends UnityPlayerActivity
{
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
ShareSDKUtils.prepare();
}
}

The shareSDK plugin only supply this jar file no source code. I found out that I can’t modify the file above, what should I do then?