下划线显示在我的EditText文本下方。
<EditText
android:id="@+id/search_text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:background="@null"
android:hint="@string/search"
android:textColorHint="@color/transparent_white"
android:textSize="@dimen/text_size_medium_18"
android:soundEffectsEnabled="true"
android:layout_marginBottom="@dimen/padding_small_4"
android:textColor="@color/white"/>