@Override
protected void initialize(Bundle savedInstanceState) {
super.initialize(savedInstanceState);
mOverlay = (ViewGroup) findViewById(R.id.overlay);
mTray = findViewById(R.id.tray);
mFab = (FloatingActionButton) findViewById(R.id.fab);
mFab.getViewTreeObserver()
.addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (android.os.Build.VERSION.SDK_INT >= 16) {
mFab.getViewTreeObserver().removeOnGlobalLayoutListener(this);
} else {
mFab.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
initializeLayout();
}
});
mFab.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
showTray();
hideFab();
}
});
setupTray(savedInstanceState);
if (findViewById(R.id.pad_pager) == null) {
showFab();
}
}
private void updateFavoriteBtn() {
fab.setImageDrawable(isFavorite ? mStarFilled : mStarOutline);
if (fab.getScaleX() == 0) {
// credits for onPreDraw technique:
// http://frogermcs.github.io/Instagram-with-Material-Design-concept-part-2-Comments-transition/
fab.getViewTreeObserver()
.addOnPreDrawListener(
new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
fab.getViewTreeObserver().removeOnPreDrawListener(this);
fab.animate()
.withLayer()
.scaleX(1f)
.scaleY(1f)
.setInterpolator(new DecelerateInterpolator())
.setDuration(mAnimShortDuration)
.start();
return true;
}
});
}
}