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SurfaceView 中的 Android 动画角色

发布于 2024-11-18 05:29:06 字数 137 浏览 1 评论 0原文

我想在屏幕上制作一个角色的动画（例如遛狗）。 AnimationDrawable 似乎非常适合此目的，并且 AnimationDrawable 需要 ImageView。如何在 SurfaceView 中添加和移动 ImageView？

谢谢。

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陪你到最终 2024-11-25 05:29:06

您不需要 ImageView。

如果您的动画是 XML Drawable，您可以直接从 Resources 将其加载到 AnimationDrawable 变量中：

Resources res = context.getResources();
AnimationDrawable animation = (AnimationDrawable)res.getDrawable(R.drawable.anim);

然后设置其边界并在canvas：

animation.setBounds(left, top, right, bottom);
animation.draw(canvas);

您还需要手动设置动画以在下一个计划间隔运行。这可以通过使用animation.setCallback创建一个新的回调，然后实例化android.os.Handler并使用handler.postAtTime方法来完成将下一个动画帧添加到当前Thread 的消息队列中。

animation.setCallback(new Callback() {

  @Override
  public void unscheduleDrawable(Drawable who, Runnable what) {
    return;
  }

  @Override
  public void scheduleDrawable(Drawable who, Runnable what, long when) {
    //Schedules a message to be posted to the thread that contains the animation
    //at the next interval. 
    //Required for the animation to run. 
    Handler h = new Handler(); 
    h.postAtTime(what, when);
  }

  @Override
  public void invalidateDrawable(Drawable who) {
    return;
  }
});

animation.start();

You don't need an ImageView.

If your animation is an XML Drawable, you can load it directly from the Resources into an AnimationDrawable variable:

Resources res = context.getResources();
AnimationDrawable animation = (AnimationDrawable)res.getDrawable(R.drawable.anim);

Then set it's bounds and draw on the canvas:

animation.setBounds(left, top, right, bottom);
animation.draw(canvas);

You also need to manually set the animation to run on it's next scheduled interval. This can be accomplished by creating a new Callback using animation.setCallback, then instantiating an android.os.Handler and using the handler.postAtTime method to add the next animation frame to the current Thread's message queue.

animation.setCallback(new Callback() {

  @Override
  public void unscheduleDrawable(Drawable who, Runnable what) {
    return;
  }

  @Override
  public void scheduleDrawable(Drawable who, Runnable what, long when) {
    //Schedules a message to be posted to the thread that contains the animation
    //at the next interval. 
    //Required for the animation to run. 
    Handler h = new Handler(); 
    h.postAtTime(what, when);
  }

  @Override
  public void invalidateDrawable(Drawable who) {
    return;
  }
});

animation.start();

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