fab.show() not animated first time after initializing new activity

Question

I am using the floating action button (fab) component from com.android.support:design:23.1.0 Library to generate my app's fabs.

But the first time I load a new activity with fab.hide() and try to make the icon visible through fab.show() after a button was clicked, there is no animation for the fab. This happens only the first time after loading a new activity. When I try that multiple times to hide and show the button, it is animated properly.

What is the issue here? It would be a charm to get it animated also right after an activity is loaded.

Java in activity:

    fabSend = (FloatingActionButton) findViewById(R.id.fabSend);
    fabSend.hide();    


CompoundButton.OnCheckedChangeListener changeChecker = new CompoundButton.OnCheckedChangeListener() {

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (isChecked){
//                FAB on
                fabSend.show();
            }   else {
//                FAB off
                fabSend.hide();
            }
        }
    };

Layout.xml

            <android.support.design.widget.FloatingActionButton
                android:id="@+id/fabSend"
                app:borderWidth="0dp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="end"
                android:layout_alignParentBottom="true"
                android:layout_marginRight="@dimen/fab_margin"
                android:layout_marginBottom="54dp"
                android:src="@drawable/ic_check_white_24dp" />

Answer 1

I've had the same problem. In my fab xml I had visibility="gone", than I tried to show fab from the code by fab.show() - and animation was not working the first time. I've changed xml to visibility="invisible" and problem was solved.

Answer 2

Solved this one finally. I designed a new class to handle the reveal animation with a delay. Grab it here, initialize it and you're good to go. I found a pretty similar animation to the standard fab.show() at 50ms delay on it.

    public static void showFabWithAnimation(final FloatingActionButton fab, final int delay) {
    fab.setVisibility(View.INVISIBLE);
    fab.setScaleX(0.0F);
    fab.setScaleY(0.0F);
    fab.setAlpha(0.0F);
    fab.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
        @Override
        public boolean onPreDraw() {
            fab.getViewTreeObserver().removeOnPreDrawListener(this);
            fab.postDelayed(new Runnable() {
                @Override
                public void run() {
                    fab.show();
                }
            }, delay);
            return true;
        }
    });
}

Answer 3

The best way to achieve that is by simply setting your Fab's scaleX and scaleY to zero in XML. It is the easiest method and it also leaves your application code clean.

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"

    android:scaleX="0"
    android:scaleY="0"
    android:visibility="invisible"/>