android-Drawable Animation

最新推荐文章于 2022-10-01 20:03:29 发布

翻译最新推荐文章于 2022-10-01 20:03:29 发布 · 389 阅读

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本文将介绍如何利用Android中的Drawable动画功能，通过加载一系列Drawable资源来创建传统电影风格的动画效果。通过XML动画列表，实现不同图片的有序播放，模仿电影滚动画面的效果。并展示了一个实例Activity，演示如何在触摸屏幕时触发此动画。

Drawable animation lets you load a series of Drawable resources one after another to create an animation. This is a traditional animation in the sense that it is created with a sequence of different images, played in order, like a roll of film. The AnimationDrawable class is the basis for Drawable animations.

<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="true">
    <item android:drawable="@drawable/rocket_thrust1" android:duration="200" />
    <item android:drawable="@drawable/rocket_thrust2" android:duration="200" />
    <item android:drawable="@drawable/rocket_thrust3" android:duration="200" />
</animation-list>

Here's an example Activity, in which the animation is added to anImageView and then animated when the screen is touched:

AnimationDrawable rocketAnimation;

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  ImageView rocketImage = (ImageView) findViewById(R.id.rocket_image);
  rocketImage.setBackgroundResource(R.drawable.rocket_thrust);
  rocketAnimation = (AnimationDrawable) rocketImage.getBackground();
}

public boolean onTouchEvent(MotionEvent event) {
  if (event.getAction() == MotionEvent.ACTION_DOWN) {
    rocketAnimation.start();
    return true;
  }
  return super.onTouchEvent(event);
}