Question

I have simple task: fade screen (+ other actions, but it doesnt matter now) when something happens (say, button pressed).
My minSDKVersion is 11. I do it in this way: activity layout contains a view:

<View
    android:id="@+id/bgFadingView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:alpha="0"
    android:background="@android:color/black" />

and method where I fade screen is as follows:

protected void fadeBGView(boolean fadeIn)
{
    ObjectAnimator animator = ObjectAnimator.ofFloat(bgFadingView, "alpha", fadeIn ? 0.75f : 0f); //bgFadingView is initialized via findViewById(R.id.bgFadingView);
    animator.setDuration(1000);
    animator.start();
}

in other words, I have black view, which occupies the whole screen and when I need to fadeIn, I change view’s alpha from 0 to 0.75.

The problem is that it works with bad framerate… I see fading animation frame by frame – it works at about 15fps. What am I doing wrong? Android system fading works much more smoothly – I want to archieve the same result or close. How to?

Answer 1

All I had to do was:

ObjectAnimator.setFrameDelay(10);

default frame delay was too long, so my animations didnt work smoothly. The problem was not due to device performance limitations.