片段事务动画完成后执行动作 [英] Performing action after fragment transaction animation is finished

问题描述

我想在动画完成后设置一个按钮的可见性.

I want to set a buttons visibility after the animation is finished.

这就是所谓的动画:

android.support.v4.app.FragmentTransaction fAnimation = this.getActivity().getSupportFragmentManager().beginTransaction();
fAnimation.setCustomAnimations(android.R.anim.slide_in_left, R.anim.pull_out_to_left);
if (this.isVisible()) {
    fAnimation.hide(this);
    fAnimation.commit();
}

// code that will be executed when the fragment is gone (after the animation is over)

有没有办法附加一个监听器来知道我的片段何时消失?

Is there any way to attach a listener to know when my fragment is gone?

推荐答案

@nmw 在他的回答中实现的 Animator 是在 API 级别 11 中添加的，并且不能与 Android 支持库实现的 Fragments 一起使用.

The Animators that @nmw implements in his answer were added in API Level 11 and will not work with Fragments as implemented by the Android support library.

为了监听 Fragment 动画事件，我扩展了支持库的 Fragment 类并覆盖了 onCreateAnimation，将自定义 AnimationListener 附加到返回的 Animation 对象:

To listen to Fragment animation events, I extended the support library's Fragment class and overrode onCreateAnimation, attaching a custom AnimationListener to the returned Animation object:

public class MyFragment extends android.support.v4.app.Fragment {

    private static final String TAG = "MyFragment";

    @Override
    public Animation onCreateAnimation(int transit, boolean enter, int nextAnim) {

        Animation anim = AnimationUtils.loadAnimation(getActivity(), nextAnim);

        anim.setAnimationListener(new AnimationListener() {

            @Override
            public void onAnimationStart(Animation animation) {
                Log.d(TAG, "Animation started.");
                // additional functionality 
            }

            @Override
            public void onAnimationRepeat(Animation animation) {
                Log.d(TAG, "Animation repeating.");
                // additional functionality
            }

            @Override
            public void onAnimationEnd(Animation animation) {
                Log.d(TAG, "Animation ended.");
                // additional functionality
            }
        });

        return anim;
    }
}

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