複数のリサイクルビューまたはフラグメントを接続して、図のようなアニメーションを作成するにはどうすればいいですか? 質問する

その他の関連する重要なファイル:

アクティビティの詳細.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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.support.design.widget.AppBarLayout
        android:id="@+id/app_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/black"
        app:elevation="0dp">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/toolbar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:elevation="0dp"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">
            <!--dummy view-->
            <View
                android:layout_width="match_parent"
                android:layout_height="200dp"/>

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="@android:color/transparent"
                android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
                app:elevation="0dp"
                app:layout_collapseMode="pin"/>
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>

    <com.example.mwajeeh.animations.IconPageIndicator
        android:id="@+id/indicator"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:centered="true"
        app:layout_behavior="com.example.mwajeeh.animations.CollapsingIndicatorBehaviour"/>

<!--add fragments in this view pager with RecyclerView as root and app:layout_behavior="@string/appbar_scrolling_view_behavior"-->
    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.view.WindowInsetsCompat;
import android.util.AttributeSet;
import android.view.View;

public class CollapsingIndicatorBehaviour extends ViewOffsetBehavior<IconPageIndicator> {

    private static final String TAG = "CollapsingIndicatorBehaviour";
    private WindowInsetsCompat lastInsets;

    public CollapsingIndicatorBehaviour() {
    }

    public CollapsingIndicatorBehaviour(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, IconPageIndicator child, View dependency) {
        return dependency instanceof AppBarLayout;
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, IconPageIndicator child, View dependency) {
        //keep child centered inside dependency respecting android:fitsSystemWindows="true"
        int systemWindowInsetTop = 0;
        if (lastInsets != null) {
            systemWindowInsetTop = lastInsets.getSystemWindowInsetTop();
        }
        int bottom = dependency.getBottom();
        float center = (bottom - systemWindowInsetTop) / 2F;
        float halfChild = child.getHeight() / 2F;
        setTopAndBottomOffset((int) (center + systemWindowInsetTop - halfChild));
        if (dependency instanceof AppBarLayout) {
            float totalScrollRange = ((AppBarLayout) dependency).getTotalScrollRange();
            child.collapse(-dependency.getTop(), totalScrollRange);
        }
        return true;
    }

    @NonNull
    @Override
    public WindowInsetsCompat onApplyWindowInsets(CoordinatorLayout coordinatorLayout, IconPageIndicator child, WindowInsetsCompat insets) {
        lastInsets = insets;
        return super.onApplyWindowInsets(coordinatorLayout, child, insets);
    }
}