FloatingActionButton

Description

Android Google+ like floating action button which reacts on the list view scrolling events. Becomes visible when the list view is scrolled up and invisible when scrolled down.

Demo

Integration

1) Add as a dependency to your build.gradle:

dependencies {
    compile 'com.melnykov:floatingactionbutton:1.0.7'
}

2) Add the com.melnykov.fab.FloatingActionButton to your layout XML file. The button should be placed in the bottom right corner of the screen. The width and height of the floating action button are hardcoded to 56dp for the normal and 40dp for the mini button as specified in the guidlines.

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

    <ListView
            android:id="@android:id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    <com.melnykov.fab.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|right"
            android:layout_margin="16dp"
            android:src="@drawable/ic_action_content_new"
            fab:fab_colorNormal="@color/primary"
            fab:fab_colorPressed="@color/primary_pressed"
            fab:fab_colorRipple="@color/ripple" />
</FrameLayout>

3) Attach the ListView, GridView or RecyclerView(currently only the LinearLayoutManager is supported) to the button in the Java code:

ListView listView = (ListView) findViewById(android.R.id.list);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.attachToListView(listView);

FloatingActionButton extends android.widget.ImageButton so it has all methods the latter has.

If you need custom code to be executed when scrolling events occur, extend FloatingActionButton.FabOnScrollListener or FloatingActionButton.FabRecyclerOnViewScrollListener and override FabOnScrollListener.onScrollDown()/ FabOnScrollListener.onScrollUp(). Then pass an instance of a custom listener as a second argument to attachToListView/attachToRecyclerView.

Do not forget to call super.onScrollDown() and super.onScrollUp() in overriden methods. If you do not, the FAB will not react to scrolling events.

4) Add the namespace xmlns:fab="http://schemas.android.com/apk/res-auto" to your layout file.

• Set the button type (normal or mini) via the fab_type xml attribute (default is normal):

  fab:fab_type="mini"

  or

  fab.setType(FloatingActionButton.TYPE_MINI);

• Set the normal and pressed colors via the xml attributes:

  fab:fab_colorNormal="@color/primary"
  fab:fab_colorPressed="@color/primary_pressed"

  or

  fab.setColorNormal(getResources().getColor(R.color.primary));
  fab.setColorPressed(getResources().getColor(R.color.primary_pressed));

• Enable/disable the button shadow with the fab_shadow xml attribite (it's enabled by default):

  fab:fab_shadow="false"

  or

  fab.setShadow(false);

• Show/hide the button expliciltly:

  fab.show();
  fab.hide();
  
  fab.show(false); // Show without an animation
  fab.hide(false); // Hide without an animation

• Specify the ripple color for API 21+:

  fab:fab_colorRipple="@color/ripple"

  or

  fab.setColorRipple(getResources().getColor(R.color.ripple));

5) Set an icon for the FloatingActionButton using android:src xml attribute. Use drawables of size 24dp as specified by guidlines. Icons of desired size can be generated with Android Asset Studio.

Changelog

Version 1.0.7:

• Updated shadow assets to better match material design guidlines;
• Make FabOnScrollListener and FabRecyclerOnViewScrollListener implement ScrollDirectionListener for easier custom listeners usage.

Version 1.0.6:

• Added support for the RecyclerView;
• Added ripple effect and elevation for API level 21.

Thanks to Aidan Follestad.

Version 1.0.5:

• Updated shadow to more accurately match the material design spec;

Version 1.0.4:

• Allow a custom OnScrollListeners to be attached to a list view;
• Work properly with list of different height rows;
• Ignore tiny shakes of fingers.

Version 1.0.3:

• Add methods to show/hide without animation;
• Fix show/hide when a view is not measured yet.

Applications using FloatingActionButton

Please ping me if you would like to be added here.

Icon	Application
	Finger Gesture Launcher
	Vocabletrainer

Links

Country flag icons used in the sample are taken from www.icondrawer.com

License

The MIT License (MIT)

Copyright (c) 2014 Oleksandr Melnykov

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.