App flickers in android task manager -

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i noticed weird flickering occurs when app presented in android "task manager".

it seems activity drawn on top of navigation bar short time , pushed back. when other apps opened, app appears in front of others , "flickers" back.

here screencasts:

my activity_main.xml layout file implements simple navigation drawer empty framelayout replaced current fragment:

<android.support.v4.widget.drawerlayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     xmlns:app="http://schemas.android.com/apk/res-auto"      android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitssystemwindows="true"     android:background="@color/background_material_light"     tools:context=".mainactivity">      <framelayout         android:layout_width="match_parent"         android:layout_height="match_parent">          <framelayout             android:id="@+id/fragment_container_main"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:fitssystemwindows="false" />          <android.support.v7.widget.toolbar             android:id="@+id/toolbar"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:background="?attr/colorprimary"             android:minheight="?attr/actionbarsize"             android:theme="@style/widget.apptheme.toolbar"             app:popuptheme="@style/themeoverlay.appcompat.light" />      </framelayout>      <scriminsetsframelayout         android:id="@+id/navigation_drawer_container"         android:layout_width="wrap_content"         android:layout_height="match_parent"         android:fitssystemwindows="true"         android:layout_gravity="start"         android:background="?android:attr/colorbackground"         app:insetforeground="@color/insetsforeground">          <android.support.v7.widget.recyclerview             android:id="@+id/navigation_drawer_list"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:choicemode="singlechoice"             android:scrollbars="vertical"             android:divider="@null"             android:dividerheight="0dp"             tools:context="navdraweradapter" />      </scriminsetsframelayout>  </android.support.v4.widget.drawerlayout>

has ever encountered problem , knows how solve it? :)

ok, i've found issue. due window background being set @android:color/transparent in application theme.

somehow made whole activity disappear in task manager.


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