如何在滚动 RecyclerView 时滚动底部栏的 up/down

Question

随着 Google 最近发布的设计支持库，引入了几个很酷的新视图。使用一些新组件（例如 CoordinatorLayout ）可能 (!) 使您能够实现滚动行为。

我尝试了一些内置的滚动行为，但没有任何效果，

我的布局中有一个 bottombar(LinearLayout) 代替 FloatingActionButton

这是我想要的。

应该会出现此屏幕底栏的 OnLaunch。
在 Recyclerview 底部栏向上滚动时应该向下滚动。
在 recyclerview 底部栏向下滚动时应该向上滚动

是否有任何内置机制可以实现此目的？或者我们需要编写 java 代码？

这是我的代码：

main_activty.xml

<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:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

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

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:elevation="5dp"
            app:tabGravity="fill"
            app:tabIndicatorColor="@android:color/white"
            app:tabMode="fixed" />

    </android.support.design.widget.AppBarLayout>

    <!-- All Scrollable Views -->

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <!-- Bottom bar-->

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="#a0000000"
        android:orientation="horizontal"
        android:paddingBottom="@dimen/padding_small"
        android:paddingTop="@dimen/padding_small">

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.33"
            android:gravity="center"
            android:paddingBottom="@dimen/padding_small"
            android:paddingTop="@dimen/padding_small"
            android:text="AC"
            android:textColor="@color/white" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.33"
            android:gravity="center"
            android:paddingBottom="@dimen/padding_small"
            android:paddingTop="@dimen/padding_small"
            android:text="Sleeper"
            android:textColor="@color/white" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.33"
            android:gravity="center"
            android:paddingBottom="@dimen/padding_small"
            android:paddingTop="@dimen/padding_small"
            android:text="Premium"
            android:textColor="@color/white" />

    </LinearLayout>


</android.support.design.widget.CoordinatorLayout>

fragment.xml（这里放了我的 recyclerview 代码）

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingBottom="@dimen/padding_small"
        android:paddingTop="@dimen/padding_small"
        android:weightSum="1">

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.33"
            android:background="@drawable/bg_srp_sorter"
            android:clickable="true"
            android:gravity="center"
            android:paddingBottom="@dimen/padding_small"
            android:paddingTop="@dimen/padding_small"
            android:text="Departure" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.33"
            android:background="@drawable/bg_srp_sorter"
            android:gravity="center"
            android:paddingBottom="@dimen/padding_small"
            android:paddingTop="@dimen/padding_small"
            android:text="Duration" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.33"
            android:gravity="center"
            android:paddingBottom="@dimen/padding_small"
            android:paddingTop="@dimen/padding_small"
            android:text="Price" />

    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/lite_gray"></View>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:weightSum="1">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/bus_list_recycler_view"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1" />

    </LinearLayout>
</LinearLayout>

toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar 

xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorPrimary"
    app:layout_scrollFlags="scroll|enterAlways"
    android:minHeight="?attr/actionBarSize">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="1">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.10">

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/abc_ic_ab_back_mtrl_am_alpha" />


        </LinearLayout>


        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.78"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:weightSum="1">

                <TextView
                    android:id="@+id/toolbar_title_source"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.47"
                    android:ellipsize="end"
                    android:singleLine="true"
                    android:text="Thiruvananthapuram "
                    android:textColor="@color/white"
                    android:textSize="@dimen/label_text_size_large" />

                <TextView
                    android:id="@+id/toolbar_title_arrow"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.08"
                    android:text="@string/char_right"
                    android:textColor="@color/white"
                    android:textSize="@dimen/label_text_size_large"
                    android:textStyle="bold" />

                <TextView
                    android:id="@+id/toolbar_title_destination"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.47"
                    android:ellipsize="end"
                    android:singleLine="true"
                    android:text=" Cochin"
                    android:textColor="@color/white"
                    android:textSize="@dimen/label_text_size_large" />


            </LinearLayout>


            <TextView
                android:id="@+id/toolbar_sub_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="2 Seat(s)"
                android:textColor="@color/lite_gray"
                android:textSize="@dimen/label_text_size_normal" />

        </LinearLayout>


        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.13">

            <ImageView
                android:layout_width="30dp"
                android:layout_height="30dp"
                android:scaleType="fitCenter"
                android:src="@drawable/filter" />
        </LinearLayout>
    </LinearLayout>

</android.support.v7.widget.Toolbar>

Answer 1

由于您使用的是 CoordinatorLayout，因此您可以创建一个自定义 Behaviour 来实现您所要求的功能，请遵循以下示例： create class extends CoordinatorLayout.Behavior<View> 遵循以下示例：

public class QuickReturnFloaterBehavior extends CoordinatorLayout.Behavior<View> {

    private int distance;

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

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, View child, View directTargetChild, View target, int nestedScrollAxes) {
        return (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0;
    }

    @Override public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dx, int dy, int[] consumed) {
        if (dy > 0 && distance < 0 || dy < 0 && distance > 0) {
            child.animate().cancel();
            distance = 0;
        }
        distance += dy;
        final int height = child.getHeight() > 0 ? (child.getHeight()) : 600/*update this accordingly*/;
        if (distance > height && child.isShown()) {
            hide(child);
        } else if (distance < 0 && !child.isShown()) {
            show(child);
        }
    }

    private void hide(View view) {
        view.setVisibility(View.GONE);// use animate.translateY(height); instead
    }

    private void show(View view) {
        view.setVisibility(View.VISIBLE);// use animate.translateY(-height); instead
    }

}

现在应用此 behaviour 将其添加到您的布局中

app:layout_behavior="com.example.QuickReturnFloaterBehavior"

Answer 2

我是这样做的：

mRecylerView.addOnScrollListener(new HideShowScrollListener() {
            @Override
            public void onHide() {
                //fab.animate().setInterpolator(new AccelerateDecelerateInterpolator()).scaleX(0).scaleY(0);
               // do your hiding animation here

            }

            @Override
            public void onShow() {
               // fab.animate().setInterpolator(new AccelerateDecelerateInterpolator()).scaleX(1).scaleY(1);
              // do your showing animation here
            }
        });

您将需要HideShowScrollListener.class

/**
* This class is a ScrollListener for RecyclerView that allows to show/hide
* views when list is scrolled.
* */
public abstract class HideShowScrollListener extends RecyclerView.OnScrollListener {
    private static final int HIDE_THRESHOLD = 20;
    private int scrolledDistance = 0;
    private boolean controlsVisible = true;

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);

        if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {
            onHide();
            controlsVisible = false;
            scrolledDistance = 0;
        } else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) {
            onShow();
            controlsVisible = true;
            scrolledDistance = 0;
        }

        if((controlsVisible && dy>0) || (!controlsVisible && dy<0)) {
            scrolledDistance += dy;
        }
    }

    public abstract void onHide();
    public abstract void onShow();

}

Answer 3

@k0sh 给出了很好的解决方案。我想更新它以获得流畅的动画同时显示和隐藏布局。替换里面的完整代码 onNestedPreScroll() 使用以下代码：

if (dy > 0) {

        CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
        int viewBottomMargin = layoutParams.bottomMargin;
        child.animate().translationY(child.getHeight() + viewBottomMargin).setInterpolator(new LinearInterpolator()).start();

} else if (dy < 0) {

        child.animate().translationY(0).setInterpolator(new LinearInterpolator()).start();

}

Answer 4

片段中的可见性和动画隐藏：

recyclerView.addOnScrollListener(new HideShowScrollListener() {
        final Fragment parentFragment = getParentFragment();
        @Override
        public void onHide() {
            bottomLayout.animate().setDuration(200).translationYBy(-bottomLayout.getHeight()).setListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationEnd(Animator animation) {
                        bottomLayout.setVisibility(View.GONE);
                    }
            });
        }

        @Override
        public void onShow() {
            bottomLayout.animate().setDuration(200).translationY(0).setListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationEnd(Animator animation) {
                        bottomLayout.setVisibility(View.VISIBLE);
                    }
            });
        }

        @Override
        public void onScrolled() {
            // To load more data
        }
    });

HideShowScrollListener.java

public abstract class HideShowScrollListener extends RecyclerView.OnScrollListener {
        private static final int HIDE_THRESHOLD = 20;
        private int scrolledDistance = 0;
        private boolean controlsVisible = true;

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);

            onScrolled();

            if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {
                onHide();
                controlsVisible = false;
                scrolledDistance = 0;
            } else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) {
                onShow();
                controlsVisible = true;
                scrolledDistance = 0;
            }

            if((controlsVisible && dy>0) || (!controlsVisible && dy<0)) {
                scrolledDistance += dy;
            }
        }

        public abstract void onHide();
        public abstract void onShow();
        public abstract void onScrolled();
}

Answer 5

@k0sh 的有效，但有时听不到轻微的滚动。

我在 NestedScrollView 中有内容，底栏是 LinearLayout，但没有回收站视图。所以，我不能使用其他建议的答案。

有相同情况的可以使用postBottom Navigation Behavior中的BottomNavigationBehavior。它完美且有用。

When the current top-level view has a scrolling content, the bottom navigation should hide when it is scrolled down and retract back when the content is scrolled up. For this purpose, we need to be aware of the direction of the scroll. VerticalScrollingBehavior is a generic layout behavior that it is somehow an extension to the CoordinatorLayout.Behavior that dispatches events on for direction of scrolling.

BottomNavigationBehavior 的源代码 - https://gist.github.com/NikolaDespotoski/1d6fef4949eb9be05a46#file-bottomnavigationbehavior-java

来自 BottomNavigationBehavior

的片段

@Override
public void onDirectionNestedPreScroll(CoordinatorLayout coordinatorLayout, V child, View target, int dx, int dy, int[] consumed, @ScrollDirection int scrollDirection) {
    handleDirection(child, scrollDirection);
}

@Override
protected boolean onNestedDirectionFling(CoordinatorLayout coordinatorLayout, V child, View target, float velocityX, float velocityY, @ScrollDirection int scrollDirection) {
    handleDirection(child, scrollDirection);
    return true;
}

private void handleDirection(V child, @ScrollDirection int scrollDirection) {
    if (!scrollingEnabled) return;
    if (scrollDirection == ScrollDirection.SCROLL_DIRECTION_DOWN && hidden) {
        hidden = false;
        animateOffset(child, 0);
    } else if (scrollDirection == ScrollDirection.SCROLL_DIRECTION_UP && !hidden) {
        hidden = true;
        animateOffset(child, child.getHeight());
    }
}

Answer 6

package com.keshav.hideactionbarandfooterexample;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.widget.FrameLayout;
import android.widget.ImageButton;

import java.util.ArrayList;
import java.util.List;

import adapters.RecyclerAdapter;
import listners.HidingScrollListener;

public class MainActivity extends AppCompatActivity {

    private Toolbar mToolbar;
    private Toolbar toolbar_bottom;
    private ImageButton mFabButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setTheme(R.style.AppThemeRed);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Log.e("keshav", "MainActivity called");

        initToolbar();
        mFabButton = (ImageButton) findViewById(R.id.fabButton);
        initRecyclerView();
    }

    private void initToolbar() {
        mToolbar = (Toolbar) findViewById(R.id.toolbar);
        toolbar_bottom = (Toolbar) findViewById(R.id.toolbar_bottom);
        setSupportActionBar(mToolbar);
        setSupportActionBar(toolbar_bottom);
        setTitle(getString(R.string.app_name));
        mToolbar.setTitleTextColor(getResources().getColor(android.R.color.white));
        toolbar_bottom.setTitleTextColor(getResources().getColor(android.R.color.white));


        toolbar_bottom.setVisibility(View.GONE);
    }

    private void initRecyclerView() {
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        RecyclerAdapter recyclerAdapter = new RecyclerAdapter(createItemList());
        recyclerView.setAdapter(recyclerAdapter);

        recyclerView.addOnScrollListener(new HidingScrollListener() {
            @Override
            public void onHide() {
                hideViews();
            }

            @Override
            public void onShow() {
                showViews();
            }
        });
    }

    private void hideViews() {
        // TODO (-mToolbar)  plus means  2 view above ho jaye or not visible to user
        mToolbar.animate().translationY(-mToolbar.getHeight()).setInterpolator(new AccelerateInterpolator(2));

        // TODO uncomment this Hide Footer in android when Scrolling
        // TODO (+mToolbar)  plus means  2 view forward ho jaye or not visible to user
        toolbar_bottom.animate().translationY(+toolbar_bottom.getHeight()).setInterpolator(new AccelerateInterpolator(2));

        // TODO keshav Hide Also Floatng Button In Android
        FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mFabButton.getLayoutParams();
        int fabBottomMargin = lp.bottomMargin;
        mFabButton.animate().translationY(mFabButton.getHeight() + fabBottomMargin).setInterpolator(new AccelerateInterpolator(2)).start();
        // TODO keshav Hide Also Floatng Button In Android
    }

    private void showViews() {
        mToolbar.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2));

        // TODO uncomment this Hide Footer in android when Scrolling
        toolbar_bottom.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2));
        mFabButton.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2)).start();
    }

    private List<String> createItemList() {
        List<String> itemList = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            itemList.add("Item " + i);
        }
        return itemList;
    }
}

=============================================
             RecyclerAdapter
=============================================
package adapters;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.keshav.hideactionbarandfooterexample.R;

import java.util.List;

/*
* RecyclerView Adapter that allows to add a header view.
* */
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private static final int TYPE_HEADER = 2;
    private static final int TYPE_ITEM = 1;
    private List<String> mItemList;

    public RecyclerAdapter(List<String> itemList) {
        mItemList = itemList;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        Context context = parent.getContext();
        if (viewType == TYPE_ITEM) {
            final View view = LayoutInflater.from(context).inflate(R.layout.recycler_item, parent, false);
            return RecyclerItemViewHolder.newInstance(view);
        } else if (viewType == TYPE_HEADER) {
            final View view = LayoutInflater.from(context).inflate(R.layout.recycler_header, parent, false);
            return new RecyclerHeaderViewHolder(view);
        }
        throw new RuntimeException("There is no type that matches the type " + viewType + " + make sure your using types correctly");
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
        if (!isPositionHeader(position)) {
            RecyclerItemViewHolder holder = (RecyclerItemViewHolder) viewHolder;
            String itemText = mItemList.get(position - 1); // header
            holder.setItemText(itemText);
        }
    }

    public int getBasicItemCount() {
        return mItemList == null ? 0 : mItemList.size();
    }


    @Override
    public int getItemViewType(int position) {
        if (isPositionHeader(position)) {
            return TYPE_HEADER;
        }

        return TYPE_ITEM;
    }

    @Override
    public int getItemCount() {
        return getBasicItemCount() + 1; // header
    }

    private boolean isPositionHeader(int position) {
        return position == 0;
    }

}

=====================================================
         RecyclerHeaderViewHolder
=====================================================
package adapters;

import android.support.v7.widget.RecyclerView;
import android.view.View;

public class RecyclerHeaderViewHolder extends RecyclerView.ViewHolder {
    public RecyclerHeaderViewHolder(View itemView) {
        super(itemView);
    }
}

=====================================================
              RecyclerItemViewHolder
=====================================================

package adapters;

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;

import com.keshav.hideactionbarandfooterexample.R;


public class RecyclerItemViewHolder extends RecyclerView.ViewHolder {

    private final TextView mItemTextView;

    public RecyclerItemViewHolder(final View parent, TextView itemTextView) {
        super(parent);
        mItemTextView = itemTextView;
    }

    public static RecyclerItemViewHolder newInstance(View parent) {
        TextView itemTextView = (TextView) parent.findViewById(R.id.itemTextView);
        return new RecyclerItemViewHolder(parent, itemTextView);
    }

    public void setItemText(CharSequence text) {
        mItemTextView.setText(text);
    }

}

===================================================
            activity_main.xml
===================================================

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

    <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"/>

    <ImageButton
            android:id="@+id/fabButton"
            android:layout_width="56dp"
            android:layout_height="56dp"
            android:layout_gravity="bottom|right"
            android:layout_marginBottom="16dp"
            android:layout_marginRight="16dp"
            android:background="@drawable/fab_bcg"
            android:src="@drawable/ic_favorite_outline_white_24dp"
            android:contentDescription="@string/fab_description"/>


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar_bottom"
        android:layout_width="match_parent"
        android:layout_alignParentBottom="true"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"/>

    </RelativeLayout>

</FrameLayout>


==================================================
    recycle_header.xml in layout folder
==================================================

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

==================================================
    recycle_item.xml in layout folder
==================================================
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_margin="8dp"
    card_view:cardCornerRadius="4dp">
    <TextView
        android:id="@+id/itemTextView"
        android:layout_width="match_parent"
        android:layout_height="?attr/listPreferredItemHeight"
        android:gravity="center_vertical"
        android:padding="8dp"
        style="@style/Base.TextAppearance.AppCompat.Body2"/>
</android.support.v7.widget.CardView>


=================================================
                      styles.xml
=================================================
<resources>

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

    <style name="AppThemeRed" parent="AppTheme">
        <item name="colorPrimary">@color/color_primary_red</item>
        <item name="colorPrimaryDark">@color/color_primary_red_dark</item>
    </style>

    <style name="AppThemeGreen" parent="AppTheme">
        <item name="colorPrimary">@color/color_primary_green</item>
        <item name="colorPrimaryDark">@color/color_primary_green_dark</item>
    </style>

    <style name="AppThemeBlue" parent="AppTheme">
        <item name="colorPrimary">@color/color_primary_blue</item>
        <item name="colorPrimaryDark">@color/color_primary_blue_dark</item>
        <item name="colorAccent">@color/color_accent_pink</item>
    </style>

</resources>

build.gradle 依赖关系

  compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support:recyclerview-v7:25.3.1'
    compile 'com.android.support:cardview-v7:25.3.1'
    compile 'com.android.support:design:25.3.1'

如何在滚动 RecyclerView 时滚动底部栏的 up/down

How to scroll up/down of bottom bar on scrolling of RecyclerView

android

android-toolbar

android-appbarlayout