Blodhgard Blodhgard - 1 month ago 18
Android Question

Floating Action Button bug in com.android.support:design:24.2.1

After the latest update of the

com.android.support:design
library, I have a weird bug:

Correct behavihour

Bug

The expected results is the first one. However, around the 40% of the times, the FAB ignore the anchor.
This happens also in the new 25.0.0 version of the design support library.

Here the layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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:layout_gravity="center"
android:background="@color/black_semi_transparent"
android:clickable="true"
android:orientation="vertical"
android:baselineAligned="false">

<Button
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:background="@android:color/transparent"
android:onClick="onBackPressed" />

<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="12"
android:baselineAligned="false"
android:orientation="horizontal">

<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@android:color/transparent"
android:onClick="onBackPressed" />

<android.support.design.widget.CoordinatorLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="18" >

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="vertical" >

<LinearLayout
android:id="@+id/linearlayout_anchor"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:background="@color/red_primary_color"
android:orientation="vertical" >

...

</LinearLayout>

<ScrollView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="6"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp" >

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

...

</LinearLayout>
</ScrollView>
</LinearLayout>

<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:clickable="true"
android:src="@drawable/ic_more_vert_white_36dp"
app:layout_anchor="@id/linearlayout_anchor"
app:layout_anchorGravity="bottom|right|end"/>

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

<Button
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@android:color/transparent"
android:onClick="onBackPressed" />

</LinearLayout>

<Button
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:background="@android:color/transparent"
android:onClick="onBackPressed" />

</LinearLayout>


Any idea?

Answer

Yes it is bug. for the workaround you can do following way.

yourView.post(new Runnable() {
    @Override
    public void run() {
        yourView.requestLayout();
    }
});

where "yourView" is the anchored view.

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