如何在 Android 活动屏幕上淡入图像? [英] How to do a fadein of an image on an Android Activity screen?

问题描述

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彩色.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?

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?

推荐答案

嗨 Hiroshi 你可以为淡入做这个:

Hi Hiroshi you can do this for the fade in:

  ImageView myImageView= (ImageView)findViewById(R.id.myImageView);
  Animation myFadeInAnimation = AnimationUtils.loadAnimation(this, R.anim.fadein);
  myImageView.startAnimation(myFadeInAnimation); //Set animation to your ImageView

在 resanim 文件夹中，动画文件fadein.xml

and inside your resanim folder the animation file 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>

但是对于从棕褐色到全彩色的逐渐淡入，您必须使用 TransitionDrawable

but for the gradual fade in from sepia to the full color, you must use TransitionDrawable

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