动画ImageView从alpha 0到1 [英] Animate ImageView from alpha 0 to 1
问题描述
我有一个想要以隐身方式启动的imageView。单击某个按钮后,我想将图像设置为视图,然后我希望它保持在alpha 1.我该怎么做?到目前为止没有运气。如果我在xml中将alpha设置为0,那么我永远不会看到图像。如果我没有在xml中设置alpha,那么图像始终可见,当单击该按钮时,它会从0到1 alpha动画。
I have an imageView that I want to start as invisible. After a certain button is clicked, I want to animate the Image into view and then I want it to remain at alpha 1. How do I do that? So far no luck. If I set the alpha to 0 in xml, then I never see the image. If I don't set alpha in xml then the image is always visible, and when the button is clicked it animates from 0 to 1 alpha.
这是我的动画代码。
AlphaAnimation animation1 = new AlphaAnimation(0.0f, 1.0f);
animation1.setDuration(1000);
animation1.setStartOffset(5000);
animation1.setFillAfter(true);
tokenBtn.startAnimation(animation1);
推荐答案
尝试让你的ImageView 隐形
in xml:
Try to make your ImageView invisible
in xml:
<ImageView
...
android:visibility="invisible"/>
然后,通过添加 AnimationListener
,make它可见
in onAnimationStart
:
Then, by adding an AnimationListener
, make it visible
in onAnimationStart
:
...
animation1.setFillAfter(true);
animation1.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
// pass it visible before starting the animation
tokenBtn.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationRepeat(Animation animation) { }
@Override
public void onAnimationEnd(Animation animation) { }
});
// finally, start the animation
tokenBtn.startAnimation(animation1);
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