/ Blur

Library for creating blur effects under Android UI elements

Library for creating blur effects under Android UI elements


Hurry to check our newest library that helps to blur the background in Android apps. BlurTutorial highlights the needed UI elements and brings users' attention to the app's parts you're introducing. You can easily apply a blurred view behind the dialog window and context menu, singling out the important elements.


Want to play around with BlurTutorial animation? Check Appetize!

We’ve created the library to help users enhance their app's usability and appearance. BlurTutorial handles both the tasks.




To use BlurTutorial add dependency to your project:

    implementation 'com.cleveroad.blur_tutorial:blur_tutorial:1.0.1'



The main component of library is the BlurTutorial interface.

     Add list of states to tutorial.
    fun addAllStates(states: List<TutorialState>)

     Add one state to tutorial.
    fun addState(state: TutorialState)

     Add one state by position.
    fun setState(state: TutorialState, index: Int)

     Remove state from tutorial.
    fun removeState(state: TutorialState)

     Clear all states of tutorial. 
     Cancel tutorial process.
    fun clearStates()

     Get current state of tutorial.
    fun getCurrentState(): TutorialState?

     Start tutorial process.
     Should be called in [Activity.onResume] or [Fragment.onResume] or later.
     If you also highlight action bar menu items,
     call it in [Activity.onPrepareOptionsMenu] or [Fragment.onPrepareOptionsMenu] or later.
    fun start()

     Go to next state of tutorial.
     Finish the current state.
    fun next()

     Interrupt tutorial process.
     It can be renewed by calling next() or start()
    fun interrupt()
     Change configuration of
     current [BlurTutorial] instance.
    fun configure(): TutorialBuilder

     Save state of tutorial. 
     You must call it in onSaveInstanceState()
     of your Fragment or Activity.
    fun onSaveInstanceState(outState: Bundle)

     Restore state of tutorial. 
     You must call it in onRestoreInstanceState() of 
     your Fragment or Activity.
    fun onRestoreInstanceState(savedState: Bundle?)

     Release resources. 
     You must call it in onDestroy() of 
     your Fragment or Activity.
    fun onDestroy()


TutorialState is an interface, that describes UI item to explain. There are a few data classes, that implement this interface:

  • ViewState - describes the View to highlight.
  • MenuState - describes the menu item to highlight.
  • RecyclerItemState - describes the RecyclerView item to highlight.
  • PathState - describes the geometric figure to highlight.
    By using this state you can highlight a part of view or a part of visible screen area.


To create an instance of BlurTutorial you have to use TutorialBuilder.

Builder method name parameter description is required
withParent Root of your layout. Will be blurred or dimmed. yes
withPopupLayout Layout of popup window. yes
withPopupAppearAnimation Popup appear animation resource no
withPopupDisappearAnimation Popup disappear animation resource no
withPopupAppearAnimator Popup appear animator resource no
withPopupDisappearAnimator Popup disappear animator resource no
withPopupXOffset X offset of popup window no
withPopupYOffset Y offset of popup window no
withPopupCornerRadius Radius of popup corners no
withBlurRadius Radius of blur. Must be in a range (0.0; 25.0]. By default, it's 10.0 no
withOverlayColor Color of overlay, that will be displayed above blurred or dimmed background. no
withHighlightType Type of highlight: Blur or Dim. By default, it's Blur. no
withListener Listener of tutorial process yes


Also you have to set listener of tutorial process:

interface TutorialListener {

     Called before state is entered.
     Use it to prepare UI for view highlighting.
     E.g. smoothly scroll to this view.
    override fun onStateEnter(state: TutorialState)

    // Called after state exit.
    override fun onStateExit(state: TutorialState)

    // Called on state error. E.g. highlighted view is not visible, etc.
    override fun onStateError(state: TutorialState, error: StateException)

     Called when popup view is inflated.
     Use this method to populate your popup view.
    override fun onPopupViewInflated(state: TutorialState, popupView: View)

    // Called when tutorial process is finished.
    override fun onFinish()

Fragment/Activity usage

companion object {
    private const val VIEW_ID = 0
    private const val MENU_ITEM_ID = 1
    private const val RECYCLER_ITEM_ID = 2
    private const val PATH_ID = 3
    private const val RECYCLER_ITEM_INDEX = 10

private val path = Path().apply {
        addCircle(500F, 500F, 300F, Path.Direction.CCW) 

private val states by lazy {
        listOf(ViewState(VIEW_ID, tvHighlight),
               MenuState(MENU_ITEM_ID, tbMenuOwner, R.id.menu_item),
               RecyclerItemState(RECYCLER_ITEM_ID, rvOwner, RECYCLER_ITEM_INDEX),
               PathState(PATH_ID, path)

private var tutorial: BlurTutorial? = null

private val tutorialListener = object : SimpleTutorialListener() {

        override fun onPopupViewInflated(state: TutorialState, popupView: View) {
            popupView.run {
                val tvTitle = findViewById<TextView>(R.id.tvTitle)
                tvTitle.textResource = when (state.id) {
                    VIEW_ID -> R.string.view_title
                    MENU_ITEM_ID -> R.string.menu_title
                    RECYCLER_ITEM_ID -> R.string.recycler_title
                    PATH_ID -> R.string.path_state
                setOnClickListener { tutorial?.next() }
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    override fun onResume() {
    override fun onSaveInstanceState(outState: Bundle) {

    override fun onViewStateRestored(savedInstanceState: Bundle?) {

    override fun onDestroy() {
    private fun initTutorial() {
        tutorial = TutorialBuilder()
                .build().apply { addAllStates(states) }


Also depending on your Proguard config, you have to setup your proguard-rules.pro file:

-keepclassmembers class androidx.appcompat.widget.Toolbar { *; }

-keep class com.google.android.material.bottomnavigation.BottomNavigationView
-keepclassmembers class com.google.android.material.bottomnavigation.BottomNavigationView { *; }

-keep class com.google.android.material.bottomnavigation.BottomNavigationItemView
-keepclassmembers class com.google.android.material.bottomnavigation.BottomNavigationItemView { *; }

-keep class androidx.appcompat.view.menu.MenuItemImpl
-keepclassmembers class androidx.appcompat.view.menu.MenuItemImpl { *; }

-keep class com.google.android.material.navigation.NavigationView
-keepclassmembers class com.google.android.material.navigation.NavigationView { *; }

-keep class com.google.android.material.internal.NavigationMenuPresenter** { *; }
-keepclassmembers class com.google.android.material.internal.NavigationMenuPresenter { *; }

-keep class com.google.android.material.bottomappbar.BottomAppBar
-keepclassmembers class com.google.android.material.bottomappbar.BottomAppBar { *; }