使用 Transitions 框架延迟动画

Question

TransitionManager.beginDelayedTransition()我正在尝试使用支持库来延迟转换。

我想用它AutoTransition来实现LinearLayout出现/消失。动画效果与预期完全一致，只是没有延迟。

TransitionManager.beginDelayedTransition(rootViewGroup, new AutoTransition().setStartDelay(1000));
linearLayout.setVisibility(View.VISIBLE);

当然，它linearLayout是在层次结构中的。rootViewGroup

Answer 1

我做了一些测试，但不幸的是我也无法使其工作。它看起来是过渡setStartDelay中唯一的作品ChangeBounds。

请参阅以下示例（当您在过渡startDelay上设置 时first，延迟将不起作用）：

linearLayout = (LinearLayout) findViewById(R.id.testLinearLayout);
mSceneRoot = (ViewGroup) findViewById(R.id.rootView);
mStaggeredTransition = new TransitionSet();

Transition first = new Fade(Fade.OUT);
Transition second = new ChangeBounds();
Transition third = new Fade(Fade.IN);
second.setStartDelay(1000).addTarget(linearLayout);

mStaggeredTransition.setOrdering(ORDERING_SEQUENTIAL);
mStaggeredTransition.addTransition(first).addTransition(second).addTransition(third);

findViewById(R.id.testbutton).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        linearLayout.setVisibility(View.GONE);
        TransitionManager.beginDelayedTransition(mSceneRoot, mStaggeredTransition);
        linearLayout.setVisibility(View.VISIBLE);
        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) linearLayout.getLayoutParams();
        params.addRule(ALIGN_PARENT_END);
        linearLayout.setLayoutParams(params);
    }
});

所以我建议你使用这样的东西：

mSceneRoot.postDelayed(new Runnable() {
        @Override
        public void run() {
            TransitionManager.beginDelayedTransition(rootViewGroup, new AutoTransition().setStartDelay(1000));
            linearLayout.setVisibility(View.VISIBLE);
        }
    }, 1000);