private void AddTab(int position, string title, View tabView)
{
var textView = tabView.FindViewById <TextView> (Resource.Id.tab_title);
if (textView != null)
{
if (title != null)
{
textView.Text = title;
}
var alpha = pager.CurrentItem == position ? tabTextSelectedAlpha : tabTextAlpha;
ViewCompat.SetAlpha(textView, alpha);
}
tabView.Focusable = true;
tabView.Click += (object sender, EventArgs e) =>
{
if (pager.CurrentItem != position)
{
var tab = tabsContainer.GetChildAt(pager.CurrentItem);
NotSelected(tab);
pager.SetCurrentItem(position, true);
}
else if (OnTabReselectedListener != null)
{
OnTabReselectedListener.OnTabReselected(position);
}
};
tabsContainer.AddView(tabView, position, shouldExpand ? expandedTabLayoutParams : defaultTabLayoutParams);
}
public void OnOffsetChanged(AppBarLayout appBarLayout, int verticalOffset)
{
int maxScroll = appBarLayout.TotalScrollRange;
float percentage = (float)Math.Abs(verticalOffset) / (float)maxScroll;
ViewCompat.SetAlpha(statusBarView, percentage);
}
void Selected(View tab)
{
if (tab == null)
{
return;
}
var title = tab.FindViewById <TextView> (Resource.Id.tab_title);
if (title == null)
{
return;
}
title.SetTypeface(tabTypeface, tabTypefaceSelectedStyle);
ViewCompat.SetAlpha(title, tabTextSelectedAlpha);
}
public static void AnimateBgColorChange(View clickedView, View backgroundView, View bgOverlay, int newColor)
{
var centerX = (int)(ViewCompat.GetX(clickedView) + (int)(clickedView.MeasuredWidth / 2));
var centerY = clickedView.MeasuredHeight / 2;
var finalRadius = backgroundView.Width;
backgroundView.ClearAnimation();
bgOverlay.ClearAnimation();
object animator;
if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
{
if (!bgOverlay.IsAttachedToWindow)
{
return;
}
animator = ViewAnimationUtils.CreateCircularReveal(bgOverlay, centerX, centerY, 0, finalRadius);
}
else
{
ViewCompat.SetAlpha(bgOverlay, 0);
animator = ViewCompat.Animate(bgOverlay).Alpha(1);
}
var compat = animator as ViewPropertyAnimatorCompat;
if (compat != null)
{
compat
.SetListener(new CustomViewPropertyAnimatorListenerAdapter(backgroundView, newColor, bgOverlay))
.Start();
}
else if (animator != null)
{
((Animator)animator).AddListener(new CustomAnimatorListenerAdapter(backgroundView, newColor, bgOverlay));
((Animator)animator).Start();
}
bgOverlay.SetBackgroundColor(new Color(newColor));
bgOverlay.Visibility = ViewStates.Visible;
}
private void OnItemScrolled(RecyclerView recyclerView, int dx, int dy)
{
float ratio = ComputeRatio(recyclerView);
float footerRatio = Math.Max(0, Math.Min(FOOTER_RATIO_START, ratio) - FOOTER_RATIO_DIFF) / FOOTER_RATIO_MAX;
float avatarRatio = Math.Max(0, Math.Min(AVATAR_RATIO_START, ratio) - AVATAR_RATIO_DIFF) / AVATAR_RATIO_MAX;
float answerRatio = Math.Max(0, Math.Min(ANSWER_RATIO_START, ratio) - ANSWER_RATIO_DIFF) / ANSWER_RATIO_MAX;
float middleRatio = Math.Max(0, Math.Min(MIDDLE_RATIO_START, ratio) - MIDDLE_RATIO_DIFF) / MIDDLE_RATIO_MAX;
ViewCompat.SetPivotY(mFooter, 0);
ViewCompat.SetScaleY(mFooter, footerRatio);
ViewCompat.SetAlpha(mFooter, footerRatio);
ViewCompat.SetPivotY(mMiddleAnswer, mMiddleAnswer.Height);
ViewCompat.SetScaleY(mMiddleAnswer, 1f - answerRatio);
ViewCompat.SetAlpha(mMiddleAnswer, 0.5f - answerRatio);
ViewCompat.SetAlpha(mHeaderCaption1, answerRatio);
ViewCompat.SetAlpha(mHeaderCaption2, 1f - answerRatio);
View mc2 = mMiddleCollapsible[1];
ViewCompat.SetPivotX(mc2, 0);
ViewCompat.SetPivotY(mc2, mc2.Height / 2);
foreach (View view in mMiddleCollapsible)
{
ViewCompat.SetScaleX(view, avatarRatio);
ViewCompat.SetScaleY(view, avatarRatio);
ViewCompat.SetAlpha(view, avatarRatio);
}
ViewGroup.LayoutParams lp = mMiddle.LayoutParameters;
lp.Height = m120dp - (int)(m10dp * (1f - middleRatio));
mMiddle.LayoutParameters = lp;
}
private void OnCancel()
{
_backgroundView.SetBackgroundColor(_newColor);
_bgOverlay.Visibility = ViewStates.Invisible;
ViewCompat.SetAlpha(_bgOverlay, 1);
}
/// <summary>
/// Android4.4ÉÏCollapsingToolbarÕÛµþʱstatusBarÏÔʾºÍÒþ²Ø
/// </summary>
/// <param name="appBarLayout"></param>
private static void SetCollapsingToolbarStatus(AppBarLayout appBarLayout)
{
ViewCompat.SetAlpha(statusBarView, 1);
appBarLayout.AddOnOffsetChangedListener(new AppBarLayoutOffsetChanged());
}