Hi! I have an idea to improve the slidingUp. When you slide the panel must appears on the top an image with parallax effect, in this way on the finish of slide we have a FlexibleSpaceWithImage, and if you continue the scroll the image disappears like your example! What do you think?

Hi,

I'd like to ask if it's possible to implement the next style using this library, as shown on Google's guidelines (called "Flexible space with image") : http://1.bp.blogspot.com/-Vv4SxVSI2DY/VEqQxAf3PWI/AAAAAAAAA7c/mfq7XBrIGgo/s400/activity_transitions%2B%281%29.gif http://www.google.com/design/spec/patterns/scrolling-techniques.html#scrolling-techniques-scrolling

If it is possible, can you please put a sample, or explain what to do?

Hi,

EDIT : Now it's not working for Fragments

Thank you very much for this excellent library, your library has helped a lot. I found that you added new component named which has Flexible space + image + fading action bar + floating action button, this is like a complete package for me. Except that I need a ListView instead of a ScrollView.

Can you help me adding a ListView instead of ScrollView ? P.S : My ListView is already a ObservableListView

Thanks in advance.

Hello. I realised in this activity when i scroll fast down or app the sticky part with the title make some move and shows the layout that scrolling below, in gill gap with recycler view this is not happening.

And i have a question. Can i do ViewPagerTabActivity with fragment and no with activity? (I mean to extend fragment not activity and hide the supportActionbar thats the parent activity has)? I tried it and replace some staffs like setSupportActionBar because i had the actionbar from the activity but when i scroll up it doesnt hide. Thank you in advance

@ksoichiro First of all I started my code by looking at the sample (https://github.com/ksoichiro/Android-ObservableScrollView/blob/master/samples/src/main/java/com/github/ksoichiro/android/observablescrollview/samples/FlexibleSpaceWithImageListViewActivity.java). Everything works perfect if we don't do any dynamic update on listview item. But when I show/hide some views on listview item the particular list item height increases and the overall height of listview also increases. In such cases the scrollY returned is wrong sometimes. We are calling listview.requestLayout() after show/hide. But then also the same error in ScrollY occurs.

I'm using ObservableRecyclerView and it works fine on Android <5. But when I run the same code on Lollipop, I get an exception. The RecyclerView has elements, a click on them starts another activity. When I return from that one, the app crashes with the following exception:

Caused by: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: android.support.v7.widget.RecyclerView$SavedState
            at android.os.Parcel.readParcelableCreator(Parcel.java:2289)
            at android.os.Parcel.readParcelable(Parcel.java:2239)
            at android.view.AbsSavedState.<init>(AbsSavedState.java:57)
            at android.view.View$BaseSavedState.<init>(View.java:20038)
            at com.github.ksoichiro.android.observablescrollview.ObservableRecyclerView$SavedState.<init>(ObservableRecyclerView.java:265)
            at com.github.ksoichiro.android.observablescrollview.ObservableRecyclerView$SavedState.<init>(ObservableRecyclerView.java:252)
            at com.github.ksoichiro.android.observablescrollview.ObservableRecyclerView$SavedState$1.createFromParcel(ObservableRecyclerView.java:304)
            at com.github.ksoichiro.android.observablescrollview.ObservableRecyclerView$SavedState$1.createFromParcel(ObservableRecyclerView.java:301)
            at android.os.Parcel.readParcelable(Parcel.java:2246)
            at android.os.Parcel.readValue(Parcel.java:2146)
            at android.os.Parcel.readSparseArrayInternal(Parcel.java:2540)
            at android.os.Parcel.readSparseArray(Parcel.java:1868)
            at android.os.Parcel.readValue(Parcel.java:2203)
            at android.os.Parcel.readArrayMapInternal(Parcel.java:2479)
            at android.os.BaseBundle.unparcel(BaseBundle.java:221)
            at android.os.Bundle.getSparseParcelableArray(Bundle.java:871)
            at com.android.internal.policy.impl.PhoneWindow.restoreHierarchyState(PhoneWindow.java:1979)
            at android.app.Activity.onRestoreInstanceState(Activity.java:1022)
            at android.app.Activity.performRestoreInstanceState(Activity.java:977)
            at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1161)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2271)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

It looks like on Lollipop, the android.support.v7.widget.RecyclerView is not used by the app since it has the native one available. But the ObservableRecyclerView references that one, leading to the crash.

Thanks for this amazing library Soichiro, I'm curious to implement ToolbarControlListViewActivity in Listview hosted in Fragment with ViewPager setup, I've almost achieved it, but when the toolbar goes off, there is a white space created below the list like you can see in here http://i.imgur.com/RNvJUfY.png If you require i can provide you the code i used to do the setup. Help would be highly appreciated

Can you please help me how can I use this library to hide/show the toolbar just like Google Play app does?

I have a main activity and several fragments. Activity layout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <android.support.v4.widget.DrawerLayout
        android:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <!-- The main content view -->
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <include layout="@layout/toolbar" />

            <com.astuetz.PagerSlidingTabStrip
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:pstsIndicatorColor="@color/primary_text_default_material_dark"
                app:pstsTextColorSelected="@color/primary_text_default_material_dark"
                app:pstsPaddingMiddle="true"/>

            <android.support.v4.view.ViewPager
                android:id="@+id/pager"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
        </LinearLayout>

        <!-- The navigation drawer -->
        <include layout="@layout/navdrawer" />

    </android.support.v4.widget.DrawerLayout>
</LinearLayout>

Fragment:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.github.ksoichiro.android.observablescrollview.ObservableRecyclerView
        android:id="@+id/rcyclrVwWatchlist"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:paddingLeft="@dimen/watchlist_list_padding"
        android:paddingTop="@dimen/watchlist_list_padding"
        android:scrollbarStyle="outsideOverlay"
        android:scrollbars="vertical" />
</RelativeLayout>

How can I achieve this? What sample should I check for this?

Thanks

Hi!

Is it possible to mimic Google I/O 14 app scroll effect as shown in this gif? (the right one) http://4.bp.blogspot.com/-9jn0pCtadO8/U9_E1mlg8CI/AAAAAAAAAt4/yr9CCSThkpg/s640/change_1.gif

That effect is related to this post http://android-developers.blogspot.com.es/2014/08/material-design-in-2014-google-io-app.html and I've been looking through the code to find out how to implement it but I've found it too complicated for me right now.

Do you know a way of mixing your examples to achieve this effect?

Thank you for you help!

Hi @ksoichiro

Thank you for such an excellent library & make our lives better.

Well I was thinking can't we do like this in ViewPager :

1. Let us consider we have a viewpager with 3 pages which contains ListView or ScrollView
2. Each ListView or ScrollView has their own ScrollViewCallback implemented which contains the code for showing & hiding the action bar

I tried using the above method & I was able to hide & show action bar a.k.a Toolbar on scolling but the problem was occuring of white space at the bottom of view. Can this problem be solved ? I know you have a perfect way shown in demo but can we do it this way?

Let me know your views about this. Thank you

I'm testing the library and everything works fine with my API-21 phone, the floatbutton is triggered when clicked. However, when I try it with API-8 most of the things works good except the floatbutton in FlexibleSpaceWithImageListViewActivity class it's not triggered, likewise when I used a different floatbutton to melnykov's one the same happens and nothing is triggered.

I set the view to clickable in xml, and typed the following code and no luck:

mFab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Log.v("mFab1:" , "Do you want change color of this button to red?");
            }
        });

I also tried setting the floatbutton as a button and no luck.

Any suggestions? Thank you very much.

when I use this library, this is the error I get :

Your project has set android.useAndroidX=true, but configuration :app:debugRuntimeClasspath still contains legacy support libraries, which may cause runtime issues. This behavior will not be allowed in Android Gradle plugin 8.0.

is there any way to fix it?

Hi, I did see that some of the apps which uses this library are mentioned in ReadMe, I wonder why whatsapp is not listed here?

As WhatsApp does uses this library in their android-client, you can verify this in their licenses page. Even they've given courtesy.

  Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.os.BaseBundle.getInt(java.lang.String)' on a null object reference
   at com.github.ksoichiro.android.observablescrollview.a.restoreState(SourceFile:71)
   at android.support.v4.view.ViewPager.setAdapter(SourceFile:528)
   ---------
   at android.os.AsyncTask.finish(AsyncTask.java:660)
   at android.os.AsyncTask.-wrap1(AsyncTask.java)
   at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:677)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:154)
   at android.app.ActivityThread.main(ActivityThread.java:6162)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

ObservableWebView has call NestedScrollView.onInterceptTouchEvent(event) in onTouchEvent and then NestedScrollView's mLastMotionY will changed to Y coordinate value of this event's,but this value maybe is bigger than NestedScrollView's max height(when scrolled the WebView),which cause the bug that when I clicked some area inside WebView but it scroll to bottom.

Hi, Hopefully you can answer me. I havent managed to solve this for month. I did a mix of flexibleRecyclerViewSlidingup and ViewPagerTabRecyclerViewFragment, it means i have a fragment sliding up or down to the bottom with pager containing recyclerViews. I noticed while scrolling up of down that my recyclerView item get clicked in same time which i would like obviously to prevent. In face looking at ViewPagerTabRecyclerViewFragment , there is the same behavior : if we try to start a slight scroll on recyclerView, it can be seen on your samples that a click is triggered in the same time.

Could you advise a workaround to avoid this to be triggered while moving up or down? Thank you for your feedback Rgds