在SurfaceView机器人动画人物 [英] Android animate character in SurfaceView

问题描述

我要一个字符（如运行狗）屏幕上的动画。 AnimationDrawable似乎非常适合这一点，AnimationDrawable需要一个ImageView的。如何添加和左右移动的ImageView在SurfaceView？

I want to animate a character (for eg run a dog) on screen. AnimationDrawable seemed a perfect fit for this, and AnimationDrawable requires an ImageView. How do I add and move around the ImageView in SurfaceView?

感谢。

推荐答案

您不需要的ImageView 。

如果你的动画是 XML可绘制，您可以从资源直接加载到 AnimationDrawable 变量：

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);      

然后设置它的边界，并绘制在画布上：

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

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

您还需要手动设置动画上运行它的下一个预定的时间间隔。这可以通过使用创建一个新的回调 animation.setCallback ，然后实例化一个 android.os.Handler 和使用来实现在 handler.postAtTime 方法，将一个动画帧添加到当前发的消息队列。

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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