android relativelayout height not working corretly

Question

I want android:text="30" textview be center position in Relativelayout.

but android:layout_height="match_parent" is not working correctly. It look like "wrap_content".

I was trying everything I found adding one more Relativelayout and do working correctly.

how text"30" move center position
why match_parent not work?

why added one more Relativelayout then working correctly?

<androidx.core.widget.NestedScrollView
    android:id="@+id/product_grid"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="56dp"
    android:background="@color/productGridBackgroundColor"
    android:elevation="8dp"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:clipChildren="false"
        android:clipToPadding="false"
        android:orientation="vertical"
        android:padding="24dp"
        android:paddingTop="16dp">

        <com.google.android.material.card.MaterialCardView
            style="@style/Widget.MaterialComponents.CardView"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:layout_marginLeft="@dimen/mtrl_card_spacing"
            android:layout_marginTop="@dimen/mtrl_card_spacing"
            android:layout_marginRight="@dimen/mtrl_card_spacing"
            android:minHeight="200dp">

            **<!--height = match_parent not working-->**
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/home_card_title_level"/>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"

                    android:layout_centerHorizontal="true"
                    android:layout_centerVertical="true"
                    android:text="30"/>

            </RelativeLayout>

            <!--**if this code added then work perfectly**
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"/>
            -->

        </com.google.android.material.card.MaterialCardView>

    </LinearLayout>
</androidx.core.widget.NestedScrollView>

Anushree Anushree · Accepted Answer · 2019-12-27T13:08:17

Remove Relative Layout and add android:layout_gravity="center

  <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_centerHorizontal="true"
                android:layout_centerVertical="true"
                android:text="30"/>

android relativelayout height not working corretly

1 Answers