How to put RecyclerView below Toolbar and above Ta

问题:

I want to create a layout like the below image:

A CoordinatorLayout which contain :

1. CollapsingToolbarLayout( contain ImageView & Toolbar)
2. RecyclerView
3. TabLayout
4. ViewPager( that each fragment of it contain a RecyclerView)

I wanna responding to scroll events in this way:

1. CollapsingToolbarLayout expand and collapse by scrolling
2. Toolbar sticks to the top until TabLayout reach to the top
3. After that toolbar scroll up and TabLayout stick to the top

I'm having trouble with the RecyclerView between CollapsingToolbarLayout and TabLayout. I can implement this layout without that RecyclerView( I put CollapsingToolbarLayout and TabLayout inside the AppBarLayout and the ViewPager outside it, inside the CoordinatorLayout).

My Question:

1. Where should I put that RecyclerView?
2. Which & where layout_scrollFlags and layout_behavior should I set for each layouts?

It seems that AppBarLayout have a limited height. When I put the RecyclerView inside AppBarLayout, only a portion part of the RecyclerView is visible and also TabLayout disappear.

I read lots of tutorials like this one and lots of questions like this one and this one, but non of them help me.

回答1:

use this as a main layout

activity_main

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/swipe_refresh_layout_profile"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:ignore="RtlHardcoded">
        <android.support.design.widget.CoordinatorLayout
            android:id="@+id/co_profile_activity_root_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/white"
            android:visibility="visible">
            <android.support.design.widget.AppBarLayout
                android:id="@+id/appbar_profile"
                android:layout_width="match_parent"
                android:layout_height="@dimen/profile_img_placeholder_height"
                android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
                <android.support.design.widget.CollapsingToolbarLayout
                    android:id="@+id/collapse_toolbar_profile"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
                    <RelativeLayout
                        android:id="@+id/rel_top"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:scaleType="centerCrop">
                        <ImageView
                            android:id="@+id/img_bg_placeholder_profile"
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:scaleType="centerCrop"
                            android:tint="#11000000"
                            app:layout_collapseMode="parallax"
                            app:layout_collapseParallaxMultiplier="0.9" />

                        <LinearLayout
                            android:id="@+id/lin_top_inner"
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:background="#BF473e6b"
                            android:orientation="vertical"
                            android:scaleType="centerCrop">
                        </LinearLayout>

                    </RelativeLayout>

                    <FrameLayout
                        android:id="@+id/frame_detail_profile"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center|center_horizontal"
                        android:orientation="vertical"
                        app:layout_collapseMode="parallax"
                        app:layout_collapseParallaxMultiplier="0.3">
                        <android.support.v7.widget.RecyclerView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content">
                        </android.support.v7.widget.RecyclerView>
                    </FrameLayout>

                    <android.support.v7.widget.Toolbar
                        android:id="@+id/toolbar_profile"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/profile_toolbar_height"
                        android:gravity="top|center"
                        app:layout_anchor="@id/frame_detail_profile"
                        app:layout_collapseMode="pin"
                        app:theme="@style/ThemeOverlay.AppCompat.Dark"
                        app:title="">

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

                            <TextView
                                android:id="@+id/tv_toolbar_title"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:layout_marginLeft="@dimen/profile_toolbar_title_left_margin"
                                android:gravity="center_vertical|center"
                                android:ellipsize="end"
                                android:singleLine="true"
                                android:layout_gravity="center"
                                android:textColor="@android:color/white"
                                android:textSize="20sp" />
                        </LinearLayout>
                    </android.support.v7.widget.Toolbar>

                    <android.support.design.widget.TabLayout
                        android:id="@+id/tab_layout_profile"
                        android:layout_width="match_parent"
                        android:layout_height="?attr/actionBarSize"
                        android:layout_gravity="bottom"
                        android:layout_marginTop="@dimen/profile_tab_layout_top_margin"
                        android:background="@color/white"
                        app:tabIndicatorColor="@color/colorPrimary"
                        app:tabSelectedTextColor="@color/colorPrimary"
                        app:tabTextColor="@color/charcoal_grey" />
                </android.support.design.widget.CollapsingToolbarLayout>
            </android.support.design.widget.AppBarLayout>

            <android.support.v4.view.ViewPager
                android:id="@+id/view_pager_profile"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_behavior="@string/appbar_scrolling_view_behavior" />
        </android.support.design.widget.CoordinatorLayout>
    </RelativeLayout>
</android.support.v4.widget.SwipeRefreshLayout>

and for grid layout of tabs use adapter classes.

回答2:

Start with AppBarLayout under which you add CollapsingToolbarLayout with scrollFlags="scroll|exitUntilCollapsed",

add LinearLayout with vertical orientation to CollapsingToolbarLayout and add the

• FrameLayout with ImageView + Toolbar

• RecyclerView

• TabLayout

回答3:

Two things to be done:-

1. When the search button is clicked, set the visibility of recycler view to VISIBLE
2. When the back button is pressed, set the visibility of recycler view to GONE

Following are the implementations:

1. Setting the visibility of recycler view to VISIBLE:

    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.searchView) {
            rView.setVisibility(VISIBLE);
        }
        return true;
    }

2. Setting the visibility of recycle adapter to GONE

    MenuItem searchMenuItem = menu.findItem(R.id.searchView);
    MenuItemCompat.setOnActionExpandListener(searchMenuItem, new MenuItemCompat.OnActionExpandListener() {
        @Override
        public boolean onMenuItemActionExpand(MenuItem item) {
            return true;
        }

        @Override
        public boolean onMenuItemActionCollapse(MenuItem item) {
            recyclerView.setVisibility(GONE);
            return true;
        }
    });

NOTE: Do not forget to keep the visibilty as GONE initially when the activity is started