Salvuccio96 Salvuccio96 - 3 months ago 48
Android Question

How to create a floating action button (FAB) in android, using AppCompat v21?

I would like to create a floating action button (to add items to a listview), like google calendar, maintaining compatibility with pre-lollipop Android versions (before 5.0).

I created this layout:

Activity main_activity.xml:

<LinearLayout ... >

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

<RelativeLayout ... >

<!-- My rest of the layout -->

<!-- Floating action button -->
<ImageButton style="@style/AppTheme"
android:layout_width="60dp"
android:layout_height="60dp"
android:text="New Button"
android:id="@+id/button"
android:src="@drawable/ic_fab"
android:background="@drawable/fab"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="24dp"
android:layout_marginRight="24dp"/>

</RelativeLayout>

</LinearLayout>


Drawable fab.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid android:color="#ffa48bc0"/>
</shape>


Style styles.xml

<resources>
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#ff1d79b1</item>
<item name="colorPrimaryDark">#ff084d95</item>
</style>
</resources>


The result is similar, but there isn't the shading, a characteristic of material design:

Calendar's floating action button:

Calendar's floating action button

My app's floating action button:

My app's floating action button

How can I add the shading to my button?

I have already used the attribute elevation, but does not work

Answer

There is no longer a need for creating your own FAB nor using a third party library, it was included in AppCompat 22.

https://developer.android.com/reference/android/support/design/widget/FloatingActionButton.html

Just add the new support library called design in in your gradle-file:

compile 'com.android.support:design:22.2.0'

...and you are good to go:

<android.support.design.widget.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:layout_margin="16dp"
        android:clickable="true"
        android:src="@drawable/ic_happy_image" />
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