Q:

Edittext setError does not show message in android 6.0

Edittext setError method is not showing text in android 6.0 but working perfectly in android 5.0. I have tried many solutions but don't get solution and i tried all solution of Android 6 EditText.setError not working correctly, So how to fix this issue?
This is my xml:
<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/toolbar_create_page"
    android:fillViewport="false">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="180dp"
            android:id="@+id/ivPageBanner"
            android:src="@drawable/bg_timeline"
            android:scaleType="fitXY" />

        <ImageView
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:id="@+id/ivPageDp"
            android:layout_alignParentBottom="false"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_marginTop="140dp"
            android:layout_marginLeft="15dp"
            android:src="@drawable/flagwithcamera" />

        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/etPageName"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_below="@+id/ivPageDp"
            android:layout_marginTop="20dp"
            android:hint="Page name"
            style="@style/EditTextTheme"
            android:theme="@style/EditTextTheme"
            android:textCursorDrawable="@drawable/black_cursor"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="15dp"
            android:textColorHint="@color/hint_foreground_material_light" />
    </RelativeLayout>
</ScrollView>

Here is my style for Edittext:
<style name="EditTextTheme" parent="Widget.AppCompat.EditText">
    <item name="android:textColor">@color/transparent</item>
    <item name="android:textColorHint">@color/transparent</item>
    <item name="colorAccent">@color/colorPrimary</item>
    <item name="colorControlNormal">@color/colorPrimary</item>
    <item name="colorControlActivated">@color/colorPrimary</item>
</style>

and here is my Colors.xml:
<color name="colorPrimary">#64100b</color>
<color name="transparent">#fc000000</color>

A:

I got my solution. Just removed this from my Edittext:
android:theme="@style/EditTextTheme"

Reason is underline below text of setError.
Alright, but where are these underlines come from?
android:theme is an attribute of View and when you set a style as android:theme, that style will be wrapped by ContextThemeWrapper with context theme while in inflation of view.
So that means, if you set android:theme property with style that contains android:background item like
<item name="android:background">@color/red</item>

every child view of this theme owner will be have a green background.
"Widget.AppCompat.EditText" is a style and references ?attr/editTextBackground as a "android:background". And in v21/values-21.xml file @drawable/abc_edit_text_material is defined as editTextBackground.
Thanks to https://stackoverflow.com/a/42355788/5909385

