im new to Github,i want to use this MaterialView pager material design into my project i tryd to import it into android studio,but it shows some error

I am trying to solve this problem but it doesnt seem to work for me. I have styles.xml and v21/styles.xml.

My styles.xml looks like this:

<style name="AppTheme" parent="Theme.AppCompat.NoActionBar"/>

    <style name="AppTheme.NoActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="android:windowTranslucentStatus">true</item>  

My v21/styles.xml looks like this

<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>

    <item name="android:windowContentTransitions">true</item>
    <item name="android:windowAllowEnterTransitionOverlap">true</item>
    <item name="android:windowAllowReturnTransitionOverlap">true</item>
    <item name="android:windowSharedElementEnterTransition">@android:transition/move</item>
    <item name="android:windowSharedElementExitTransition">@android:transition/move</item>
    <item name="android:windowTranslucentStatus">true</item>

    </style>

Now I have created a BaseActivity in order to extend the Material NavDrawer in all the activities. In order to do so, it is required for me to first call the

 setContentView(R.layout.activity_main);
    super.onCreate(savedInstanceState);

If I change this order then the activities which will extend the BaseACtivity wont be able to identify the controls in the BaseActivity and it gives me error for not able to find controls.

So it seems I am in deadlock.

Please let me know what to do.

Thanks in Advance.

Hello, I use MaterialViewPager with RecyclerView, everything is ok, but when i try to remove an item from my recycler adapter (generally the last), i cant see the header view anymore. When i scroll to top after item removed, the header view stays collapsed and i dont know why.

Can you help me ?

not able to use a fragment that contains listview. if i add the listview it looks in whole screen. the effect that is on another fragments not getting in listview.

Hey, I am new to your Material ViewPager and not sure if it is an issue or not. When copying your code (from README, "Usage") into my layout, this error appears in the Android Studio Design Tab:

java.lang.NullPointerException at com.github.florent37.materialviewpager.MaterialViewPager.onFinishInflate(MaterialViewPager.java:70) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:814) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64) at android.view.LayoutInflater.rInflate(LayoutInflater.java:782) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:809) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64) at android.view.LayoutInflater.rInflate(LayoutInflater.java:782) at android.view.LayoutInflater.inflate(LayoutInflater.java:504) at android.view.LayoutInflater.inflate(LayoutInflater.java:385) at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:400) at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:332) at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350) at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:497) at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:485) at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:894) at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:485) at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:590) at com.intellij.android.designer.designSurface.AndroidDesignerEditorPanel$6.run(AndroidDesignerEditorPanel.java:480) at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320) at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310) at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254) at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269) at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227) at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217) at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238) at com.intellij.util.Alarm$Request$1.run(Alarm.java:351) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

My Code in Android Studio: `

<com.github.florent37.materialviewpager.MaterialViewPager
    android:id="@+id/materialViewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:viewpager_logo="@layout/header_logo"
    app:viewpager_logoMarginTop="100dp"
    app:viewpager_color="@color/colorPrimary"
    app:viewpager_headerHeight="200dp"
    app:viewpager_headerAlpha="1.0"
    app:viewpager_hideLogoWithFade="true"
    app:viewpager_hideToolbarAndTitle="true"
    app:viewpager_enableToolbarElevation="true"
    />

What can I do?

Regards, DDerTyp

See the random padding gap in this image.

See the random padding gap in this image.

Sometimes the header becomes transparent and the below scrolled list is visible.

Same issue !

Thanks!

i try to use MaterialViewPager and everything work ok except the color :

and this is my style.xml file :

<!-- Base application theme. -->
<!--<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">-->
    <!--&lt;!&ndash; Customize your theme here. &ndash;&gt;-->
    <!--<item name="colorPrimary">@color/colorPrimary</item>-->
    <!--<item name="colorPrimaryDark">@color/colorPrimaryDark</item>-->
    <!--<item name="colorAccent">@color/colorAccent</item>-->
<!--</style>-->

<!--<style name="AppBaseTheme" parent="@style/Theme.AppCompat.Light.NoActionBar">-->
<!--</style>-->


<style name="AppBaseTheme" parent="@style/Theme.AppCompat.Light">
</style>

<!-- Base application theme. -->
<style name="AppTheme" parent="AppBaseTheme">


    <item name="android:textColorPrimary">@android:color/white</item>
    <item name="drawerArrowStyle">@style/DrawerArrowStyle</item>
    <item name="android:windowTranslucentStatus" tools:targetApi="19">true</item>

    <item name="android:windowContentOverlay">@null</item>
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>

    <!-- Material Theme -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/accent_color</item>

    <item name="android:statusBarColor" tools:targetApi="21">@color/statusBarColor</item>
    <item name="android:navigationBarColor" tools:targetApi="21">@color/navigationBarColor</item>
    <item name="android:windowDrawsSystemBarBackgrounds" tools:targetApi="21">true</item>


</style>

<style name="DrawerArrowStyle" parent="Widget.AppCompat.DrawerArrowToggle">
    <item name="spinBars">true</item>
    <item name="color">@color/drawerArrowColor</item>
</style>

@florent37

Recycler View was working fine till used with Linear Layout Manager works fine. But when i used Grid Layout Manager ! This happened

The complete fragment shifted up and the first item of the grid view is appearing blank

Here is the code:

DrawerLayout

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/id_drawerlayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    >

<!-- main -->

<com.github.florent37.materialviewpager.MaterialViewPager
    android:id="@+id/id_materialViewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:viewpager_logo="@layout/header_logo"
    app:viewpager_pagerTitleStrip="@layout/material_view_pager_pagertitlestrip_newstand"
    app:viewpager_logoMarginTop="100dp"
    app:viewpager_color="?colorPrimary"
    app:viewpager_headerHeight="200dp"
    app:viewpager_headerAlpha="0.6"
    app:viewpager_hideLogoWithFade="false"
    app:viewpager_hideToolbarAndTitle="true"
    app:viewpager_enableToolbarElevation="true"
    app:viewpager_parallaxHeaderFactor="1.5"
    app:viewpager_headerAdditionalHeight="20dp"
    app:viewpager_displayToolbarWhenSwipe="true"
    app:viewpager_transparentToolbar="true"
    app:viewpager_animatedHeaderImage="true"
    />


<!-- slide -->
<android.support.design.widget.NavigationView
    android:id="@+id/id_navigation"
    android:layout_height="match_parent"
    android:layout_width="wrap_content"
    android:layout_gravity="start"
    app:headerLayout="@layout/navigation_header_layout"
    app:menu="@menu/navigation_menu"
    >
</android.support.design.widget.NavigationView>

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

Main Activity

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

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

</LinearLayout>

Main Activity Class

...
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

    Toolbar toolbar = materialViewPager.getToolbar();
    if(toolbar != null) {
        setSupportActionBar(toolbar);
    }
    final ActionBar actionBar = getSupportActionBar();
    if (actionBar != null){
        actionBar.setTitle("");
        actionBar.setHomeButtonEnabled(true);
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setDisplayShowCustomEnabled(true);
        actionBar.setDisplayShowTitleEnabled(true);
        actionBar.setDisplayUseLogoEnabled(true);
    }

    drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, 0, 0);

    drawerLayout.setDrawerListener(drawerToggle);

    navigationView.setNavigationItemSelectedListener((menuItem) -> {

            switch (menuItem.getItemId()) {

            }


            menuItem.setChecked(true);
            drawerLayout.closeDrawers();

            return true;
    });

    mdViewPagerAdapter = new MDViewPagerAdapter(getSupportFragmentManager());

    materialViewPager.getViewPager().setAdapter(mdViewPagerAdapter);

    materialViewPager.setMaterialViewPagerListener(new MaterialViewPager.Listener() {
        @Override
        public HeaderDesign getHeaderDesign(int i) {
            switch (i) {
                case 0:
                    return HeaderDesign.fromColorResAndUrl(
                            R.color.cyan,
                            IAMGE_URL_ONE
                    );
                case 1:
                    return HeaderDesign.fromColorResAndUrl(
                            R.color.cyan,
                            IAMGE_URL_TWO
                    );
                case 2:
                    return HeaderDesign.fromColorResAndUrl(
                            R.color.cyan,
                            IAMGE_URL_THREE
                    );
                default:
                    return null;
            }

        }
    });

    materialViewPager.getViewPager().setOffscreenPageLimit(mdViewPagerAdapter.getCount());
    materialViewPager.getPagerTitleStrip().setViewPager(materialViewPager.getViewPager());

    logo.setOnClickListener((view) -> {
        materialViewPager.notifyHeaderChanged();
    });

Fragment

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

    fetchData();

    //TODO test topic data
    for (int i = 0; i < 20; i++) {
        Topic topic =  new Topic();
        topics.add(topic);
    }

    topicFragmentAdapter.setData(topics);
    recyclerView.setLayoutManager(mLayoutManager);
    recyclerView.setHasFixedSize(true);
    recyclerView.setAdapter(topicFragmentAdapter);

    refreshLayout.setOnRefreshListener(() -> {
        topicFragmentAdapter.notifyDataSetChanged();
        refreshLayout.setRefreshing(false);
    });

    MaterialViewPagerHelper.registerRecyclerView(getActivity(),
            recyclerView, null);

I attempt to find something wrong, but failed. Please, or give me some suggestion! Thank you!

My Activity code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_movie_details_news_stand);
    setTitle("");

    mViewPager = (MaterialViewPager) findViewById(R.id.materialViewPager);

    toolbar = mViewPager.getToolbar();
    mDrawer = (DrawerLayout) findViewById(R.id.drawerLayout);

    if (toolbar != null) {
        setSupportActionBar(toolbar);

        final ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.setDisplayHomeAsUpEnabled(true);
            actionBar.setDisplayShowHomeEnabled(true);
            actionBar.setDisplayShowTitleEnabled(true);
            actionBar.setDisplayUseLogoEnabled(false);
            actionBar.setHomeButtonEnabled(true);
        }
    }

    DrawerFragment drawerFragment = (DrawerFragment) getSupportFragmentManager().findFragmentById(R.id.drawerFragment);
    drawerFragment.setUp(mDrawer, toolbar);

    volleySingleton = VolleySingleton.getInstance();
    requestQueue = volleySingleton.getRequestQueue();

    long movieID = getIntent().getLongExtra(INTENT_EXTRA_MOVIE_ID, 1);
    String title = getIntent().getStringExtra(INTENT_EXTRA_MOVIE_TITLE);

    generateFragments();

    mViewPager.getViewPager().setAdapter(new movieDetailsPagerAdapter(getSupportFragmentManager()));

    if (savedInstanceState != null) {
        movieDetails = savedInstanceState.getParcelable(STATE_MOVIE_DETAILS);

        if (movieDetails.server_timezone != null && !movieDetails.server_timezone.equals("N/A")) {
           mViewPager.setMaterialViewPagerListener(new MovieMaterialViewPagerListener());
        } else {
            sendJsonRequest(URLModifierclass.getMovieDetailsByIDURL(movieID, true, true));
            mViewPager.setMaterialViewPagerListener(new DefaultMaterialViewPagerListener());
        }
    } else {
        sendJsonRequest(URLModifierclass.getMovieDetailsByIDURL(movieID, true, true));
        mViewPager.setMaterialViewPagerListener(new DefaultMaterialViewPagerListener());
    }

    mViewPager.getViewPager().setOffscreenPageLimit(mViewPager.getViewPager().getAdapter().getCount());
    mViewPager.getPagerTitleStrip().setViewPager(mViewPager.getViewPager());

    View view = mViewPager.getRootView();
    TextView headerLogo = (TextView) view.findViewById(R.id.logo_white);
    headerLogo.setText(title);

    mViewPager.getViewPager().setCurrentItem(1);


}

Everything works fine, if i open normally. But if i rotate the screen once. From then it shows all the below problems, even if i come to portriat. so when saveninstancestate!=null it fails.

The Problems

1. it sets the title but the title is above statusbar. I can see character tails in statusbar
2. I made viewpager_transparentToolbar="false" but that is transparent
3. It doesn't set currentItem as 1

All these occur from first time i rotate the screen

Try 1 : :+1: i tried moving if block top the end of oncreate but still all problems exist

Try 2: :+1: i tried removing everything from if block except retrieving my object still it fails

Any Idea? Should i need to do some thing in onSavedInstanceState() ??

Would be nice to have the option to disable the effect and expose the ImageView so the scale type can be set. Great library though, thanks for creating it!

How can i set the attribute scale type for the header image as I have not using the separate layout for header . I am setting the images programatically

java.lang.NullPointerException: Attempt to read from field 'float com.github.florent37.materialviewpager.MaterialViewPagerAnimator.lastYOffset' on a null object reference
    at com.github.florent37.materialviewpager.MaterialViewPager.onSaveInstanceState(MaterialViewPager.java:123)
    at android.view.View.dispatchSaveInstanceState(View.java:15688)
    at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:3206)
    at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:3212)
    at android.view.View.saveHierarchyState(View.java:15671)
    at androidx.fragment.app.FragmentManagerImpl.saveFragmentViewState(FragmentManagerImpl.java:2276)
    at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:951)
    at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
    at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:434)
    at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
    at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
    at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
    at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
    at androidx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)
    at android.os.Handler.handleCallback(Handler.java:751)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6119)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

whenever i run on android pie it crashes and gives me error java.lang.IllegalArgumentException: Cannot set 'scaleX' to Float.NaN

Please anyone help me out with this