11

I have an activity where I am changing the ImageView periodically, for that I wrote the below line of code .

imageview.setImageUri(resId);

I am increasing the resource id .It works fine but there is sudden transition from one image to another. I don't want that,I want the smooth transition of image view to another image. How can i do that?

4

3 回答 3

17

尝试这个

ImageView demoImage = (ImageView) findViewById(R.id.DemoImage);
int imagesToShow[] = { R.drawable.image1, R.drawable.image2,R.drawable.image3 };

animate(demoImage, imagesToShow, 0,false);  



  private void animate(final ImageView imageView, final int images[], final int imageIndex, final boolean forever) {

  //imageView <-- The View which displays the images
  //images[] <-- Holds R references to the images to display
  //imageIndex <-- index of the first image to show in images[] 
  //forever <-- If equals true then after the last image it starts all over again with the first image resulting in an infinite loop. You have been warned.

    int fadeInDuration = 500; // Configure time values here
    int timeBetween = 3000;
    int fadeOutDuration = 1000;

    imageView.setVisibility(View.INVISIBLE);    //Visible or invisible by default - this will apply when the animation ends
    imageView.setImageResource(images[imageIndex]);

    Animation fadeIn = new AlphaAnimation(0, 1);
    fadeIn.setInterpolator(new DecelerateInterpolator()); // add this
    fadeIn.setDuration(fadeInDuration);

    Animation fadeOut = new AlphaAnimation(1, 0);
    fadeOut.setInterpolator(new AccelerateInterpolator()); // and this
    fadeOut.setStartOffset(fadeInDuration + timeBetween);
    fadeOut.setDuration(fadeOutDuration);

    AnimationSet animation = new AnimationSet(false); // change to false
    animation.addAnimation(fadeIn);
    animation.addAnimation(fadeOut);
    animation.setRepeatCount(1);
    imageView.setAnimation(animation);

    animation.setAnimationListener(new AnimationListener() {
        public void onAnimationEnd(Animation animation) {
            if (images.length - 1 > imageIndex) {
                animate(imageView, images, imageIndex + 1,forever); //Calls itself until it gets to the end of the array
            }
            else {
                if (forever == true){
                animate(imageView, images, 0,forever);  //Calls itself to start the animation all over again in a loop if forever = true
                }
            }
        }
        public void onAnimationRepeat(Animation animation) {
            // TODO Auto-generated method stub
        }
        public void onAnimationStart(Animation animation) {
            // TODO Auto-generated method stub
        }
    });
}
于 2013-07-11T07:31:24.970 回答
2

尝试 alpha 动画。首先淡出imageview，在动画结束时，更改资源，然后淡入imageview。

于 2013-07-11T07:25:33.470 回答
1

为了平滑过渡，您必须在 Android 中使用动画，首先阅读以下链接： http ://www.vogella.com/articles/AndroidAnimation/article.html

stackoverflow 上有很多关于动画的类似问题，网上有很多关于这个主题的教程。在 google 上进行简单搜索将为您带来大量结果

于 2013-07-11T07:25:28.810 回答