ExpansionPanel

Expansion panels contain creation flows and allow lightweight editing of an element.

AndroidX Ready

Based on Expansion Panels described on Material Design Components https://material.io/archive/guidelines/components/expansion-panels.html#

Download

dependencies {
    implementation 'com.github.florent37:expansionpanel:1.2.4'
}

Usage

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

    <com.github.florent37.expansionpanel.ExpansionHeader
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        app:expansion_headerIndicator="@id/headerIndicator"
        app:expansion_layout="@id/expansionLayout"
        app:expansion_toggleOnClick="true">

        <!-- HEADER -->

        ...
        <!-- HEADER INDICATOR -->
        <ImageView
               android:adjustViewBounds="true"
               android:id="@+id/headerIndicator"
               android:layout_gravity="center_vertical|right"
               android:layout_height="wrap_content"
               android:layout_marginLeft="16dp"
               android:layout_width="wrap_content"
               app:srcCompat="@drawable/ic_expansion_header_indicator_grey_24dp" />


    </com.github.florent37.expansionpanel.ExpansionHeader>

    <com.github.florent37.expansionpanel.ExpansionLayout
        android:id="@+id/expansionLayout"
        android:layout_height="wrap_content"
        android:layout_width="match_parent">

        <!-- CONTENT -->

    </com.github.florent37.expansionpanel.ExpansionLayout>
</LinearLayout>

Header

1. Connect with his Expansion Layout : expansion_layout (they must have the same parent)
2. Define the indicator view with expansion_headerIndicator (the id of a view inside the header)
3. If you want to expand/close when the header is clicked, setup expansion_toggleOnClick
4. You can modify the indicator rotation with expansion_headerIndicatorRotationExpanded and expansion_headerIndicatorRotationCollapsed

Layout

You can modify the default expansion of the label with `app:expansion_expanded="false"

Layout can be toggled programmatically with .toggle()

Use .setEnable(true/false) to enable/disable the expansion

Listener

Just add a listener into ExpansionLayout (not the header !) to follow the expansion layout state

ExpansionLayout expansionLayout = findViewById(...);
expansionLayout.addListener(new ExpansionLayout.Listener() {
    @Override
    public void onExpansionChanged(ExpansionLayout expansionLayout, boolean expanded) {

    }
});

Open only one

You can setup multiple expansions layout to enable only 1 opened at time

final ExpansionLayoutCollection expansionLayoutCollection = new ExpansionLayoutCollection();
expansionLayoutCollection.add(ex1);
expansionLayoutCollection.add(ex2);

expansionLayoutCollection.openOnlyOne(true);

or direcly in xml with

• ExpansionsViewGroupLinearLayout
• ExpansionsViewGroupFrameLayout
• ExpansionsViewGroupRelativeLayout
• ExpansionsViewGroupConstraintLayout

<com.github.florent37.expansionpanel.viewgroup.ExpansionsViewGroupLinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:expansion_openOnlyOne="true"
                android:orientation="vertical">

                <!-- Expansions Header & Layouts -->

</com.github.florent37.expansionpanel.viewgroup.ExpansionsViewGroupLinearLayout>

Horizontal

Simply use HorizontalExpansionLayout instead of ExpansionLayout

<com.github.florent37.expansionpanel.HorizontalExpansionLayout
        android:id="@+id/expansionLayout"
        android:layout_height="wrap_content"
        android:layout_width="match_parent">

        <!-- CONTENT -->

</com.github.florent37.expansionpanel.HorizontalExpansionLayout>

RecyclerView

Sample: https://github.com/florent37/ExpansionPanel/blob/master/app/src/main/java/florent37/github/com/expansionpanel/ExpansionPanelSampleActivityRecycler.java

public class MyRecyclerAdapter extends RecyclerView.Adapter<MyRecyclerHolder> {

    ...

    //add an ExpansionLayoutCollection to your recycler adapter
    private final ExpansionLayoutCollection expansionsCollection = new ExpansionLayoutCollection();


    @Override
    public void onBindViewHolder(MyRecyclerHolder holder, int position) {
        //bind your elements

        //just add the ExpansionLayout (with findViewById) to the expansionsCollection
        expansionsCollection.add(holder.getExpansionLayout());
    }
}

Single Listener

Update gradle, add ability to have only one listener at time

For what? If you tried to debug ViewHolders with this layout, then you might notice that over time addListener continues to add a listener, which causes a lot of unnecessary listeners and, moreover, there can be many listeners to one layouts in different ViewHolders due to which it may cause logic breakdown

var isExpanded = false

expandableLayout.run {
    //expandableLayout.singleListener = true
    singleListener = true

    expandableLayout.addListener { expansionLayout, expanded ->
        isExpanded = expanded
    }

    //do not toggle (expand/collapse, etc) before add listener

    if (isExpanded)
        expand(false)
    else
        collapse(false)
}

Credits

Author: Florent Champigny

Blog : http://www.tutos-android-france.com/

Fiches Plateau Moto : https://www.fiches-plateau-moto.fr/

License

Copyright 2017 Florent37, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.