Button not showing in API 26 and above

[VinodKumar-b]

My app minimum API Level is 21 and max is 28. Button is not showing in API 26 and above. But button is working. when I click on the position where the button was placed, from then onwards the button is showing in API 26 and above.

the following is the xml code for my layout file.

`

<android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar_layout"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">

        <android.support.v7.widget.AppCompatImageButton
            android:id="@+id/d_btn_close"
            android:layout_width="?attr/actionBarSize"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:tint="@color/colorAccent"
            app:srcCompat="@drawable/ic_close"/>

        <TextView
            android:id="@+id/d_tv_cardName_toolbar"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center_vertical"
            android:text="@string/card_name"
            android:fontFamily="monospace"
            android:textStyle="bold"
            android:textAppearance="@style/Base.TextAppearance.AppCompat.Title"
            android:textColor="@color/secondaryTextColor" />

        <android.support.v7.widget.AppCompatImageButton
            android:id="@+id/d_btn_edt"
            android:layout_width="?attr/actionBarSize"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:tint="@color/colorAccent"
            app:srcCompat="@drawable/ic_edit" />

        <android.support.v7.widget.AppCompatImageButton
            android:id="@+id/d_btn_dlt"
            android:layout_width="?attr/actionBarSize"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:tint="@color/colorAccent"
            app:srcCompat="@drawable/ic_delete" />

    </LinearLayout>

</android.support.design.widget.AppBarLayout>

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background_1">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/spacing_medium"/>

        <LinearLayout
            android:id="@+id/lay_card"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <android.support.v7.widget.CardView
                android:id="@+id/d_card_view"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/spacing_large"
                android:visibility="visible"
                app:cardBackgroundColor="@color/light_green_700"
                app:cardCornerRadius="8dp"
                app:cardElevation="5dp">

                <!--  My Code -->

            </android.support.v7.widget.CardView>

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center_vertical"
            android:padding="8dp"
            android:baselineAligned="false">

            <LinearLayout
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:orientation="horizontal"
                android:gravity="center_vertical"
                android:paddingStart="8dp"
                android:paddingEnd="@dimen/spacing_middle">

                <View
                    android:layout_width="@dimen/spacing_middle"
                    android:layout_height="0dp" />

                <android.support.v7.widget.AppCompatImageView
                    android:id="@+id/d_img_remState"
                    android:layout_width="35dp"
                    android:layout_height="35dp"
                    android:background="?attr/selectableItemBackgroundBorderless"
                    android:src="@drawable/ic_notifications_none"
                    android:tint="@color/colorAccent"
                    android:clickable="false"/>

                <View
                    android:layout_width="@dimen/spacing_middle"
                    android:layout_height="0dp" />

                <com.sackcentury.shinebuttonlib.ShineButton
                    android:layout_width="30dp"
                    android:layout_height="30dp"
                    android:id="@+id/d_btn_fav"
                    app:btn_fill_color="@color/colorAccent"
                    app:siShape="@raw/heart"
                    android:contentDescription="@string/favorite_button"
                    app:small_shine_color="@color/colorAccent"
                    app:big_shine_color="@color/colorPrimary"
                    android:elevation="10dp" />

            </LinearLayout>

            <LinearLayout
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:gravity="center_vertical|end"
                android:orientation="horizontal">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="3dp"
                    android:text="@string/show_btn" />

                <View
                    android:layout_width="@dimen/spacing_medium"
                    android:layout_height="0dp"/>

                <android.support.v7.widget.AppCompatImageButton
                    android:id="@+id/d_btn_showw"
                    android:layout_width="35dp"
                    android:layout_height="35dp"
                    android:background="?attr/selectableItemBackgroundBorderless"
                    android:scaleType="fitXY"
                    android:src="@drawable/asl_eye"
                    android:tint="@color/colorAccent" />
                <View
                    android:layout_width="@dimen/spacing_large"
                    android:layout_height="0dp"/>

            </LinearLayout>

        </LinearLayout>

    </LinearLayout>

    <com.google.android.gms.ads.AdView
        android:id="@+id/banner_adView_credit_open"
        xmlns:ads="http://schemas.android.com/apk/res-auto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        ads:adSize="BANNER"
        ads:adUnitId="@string/banner_add_unit_id"/>

</RelativeLayout>

`