AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.android.keychain"
          android:sharedUserId="android.uid.system"
          >
    <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS"/>
    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS"/>
    <application android:label="@string/app_name">
        <service android:name="com.android.keychain.KeyChainService">
            <intent-filter>
                <action android:name="android.security.IKeyChainService"/>
                <action android:name="android.accounts.AccountAuthenticator"/>
            </intent-filter>
            <meta-data android:name="android.accounts.AccountAuthenticator"
                       android:resource="@xml/authenticator"/>
        </service>
        <activity android:name="com.android.keychain.KeyChainActivity"
                  android:theme="@style/Transparent"
		  android:excludeFromRecents="true">
	    <intent-filter>
	        <action android:name="com.android.keychain.CHOOSER"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>
  </application>
</manifest>