android - centerVertical won't work with a fragment -


i made simple fragment 2 edit texts in it. then, tried add image button. want fragment in center of activity , worked fine. however, image button won't in center of fragment below 2 edit texts. why won't centervertical work fragments? here xml code login view xml file:

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"  > <edittext     android:hint="type username"     android:id="@+id/usernametext"     android:imeoptions="actiondone"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     /> <edittext     android:hint="type password"     android:id="@+id/passwordtext"     android:layout_below="@id/usernametext"     android:imeoptions="actiondone"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     />  <imagebutton      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:src="@drawable/login"      android:onclick="onclick"      android:id="@+id/loginbtn"      android:layout_below="@id/passwordtext"      android:layout_centervertical="true"/>  </relativelayout>

and main xml file:

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.bazar.mainactivity"> <fragment  android:name="com.example.bazar.login" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerinparent="true" /> </relativelayout>

change fragment's layout params in main.xml to

android:layout_width="match_parent" android:layout_height="match_parent"

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