如何在 Android 活动屏幕上淡入图像？
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How to do a fadein of an image on an Android Activity screen?
提问by Hiroshi Iwatani
I'd like to display a photo on an Android Activity screen with doing gradual and continual fade-in from pale monotone sepia to the final full color. I know how to do it on a Java Image/BufferedImage for the Graphic object but unfortunately I know nothing for the Android programming environment. Could anyone help?
我想在 Android Activity 屏幕上显示一张照片，从苍白的单调棕褐色逐渐和连续淡入到最终的全色。我知道如何在 Java Image/BufferedImage 上为 Graphic 对象执行此操作，但不幸的是我对 Android 编程环境一无所知。有人可以帮忙吗？
回答by Jorgesys
Hi Hiroshi you can do this for the fade in:
Hi Hiroshi 你可以为淡入做这个：
ImageView myImageView= (ImageView)findViewById(R.id.myImageView);
Animation myFadeInAnimation = AnimationUtils.loadAnimation(this, R.anim.fadein);
myImageView.startAnimation(myFadeInAnimation); //Set animation to your ImageView
and inside your res\anim\ folder the animation file fadein.xml
在 res\anim\ 文件夹中，动画文件fadein.xml
<?xml version="1.0" encoding="UTF-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<alpha
android:fromAlpha="0.0"
android:toAlpha="1.0"
android:interpolator="@android:anim/accelerate_interpolator"
android:duration="3000"/>
</set>
but for the gradual fade in from sepia to the full color, you must use TransitionDrawable
但是对于从棕褐色到全色的逐渐淡入，您必须使用TransitionDrawable
回答by Ricky
I wanted an image to fade (and then disappear) once clicked from full opacity to 0. Here is how I did it:
一旦从完全不透明度点击到 0，我想要一个图像淡入淡出（然后消失）。这是我是如何做到的：
Animation a = new AlphaAnimation(1.00f, 0.00f);
a.setDuration(1000);
a.setAnimationListener(new AnimationListener() {
public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub
}
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub
}
public void onAnimationEnd(Animation animation) {
yourView.setVisibility(View.GONE);
}
});
yourView.startAnimation(a);
回答by Mike Droid
One method for this would be to use the animation set. See here;
一种方法是使用动画集。看这里;
http://developer.android.com/guide/topics/resources/available-resources.html#animation
http://developer.android.com/guide/topics/resources/available-resources.html#animation
Some example code I have done (infinite loop fade out in this example) ;
我做过的一些示例代码（在这个例子中无限循环淡出）；
In the animation .xml file;
在动画 .xml 文件中；
<alpha android:fromAlpha="1.0"
android:toAlpha="0.3"
android:duration="7000"
android:repeatMode="restart"
android:repeatCount="infinite"/>
In the java file;
在java文件中；
ImageView introanim = (ImageView) findViewById(R.id.introanim);
Animation StoryAnimation = AnimationUtils.loadAnimation(this, R.anim.intro_anim);
introanim.startAnimation(StoryAnimation);
You could fade from your sepia background/picture to whatever you want...
你可以从你的棕褐色背景/图片淡入任何你想要的......
回答by Emanuel Adrian Lucaci
Another much simpler solution is to just put a stub onClick method to your ImageView you want to fade, then inside the method you add this:
另一个更简单的解决方案是将存根 onClick 方法放在要淡化的 ImageView 中，然后在方法中添加以下内容：
view.animate().alpha(0).setDuration(2000);
/* Alpha attribute translates to opacity.
A solid View means that the alpha attribute is set to 1 (which is the
default) and completely invisible is 0 */
