Android transition（RelativeLayout动画实现）

 //通过偏移各个开始时间来创建“stagger”动画的自定义过渡
        mStaggeredTransition = new TransitionSet();
        Transition first = new ChangeBounds();
        Transition second = new ChangeBounds();
        Transition third = new ChangeBounds();
        Transition fourth = new ChangeBounds();

        first.addTarget(mFirstButton);
        second.setStartDelay(50).addTarget(mSecondButton);
        third.setStartDelay(100).addTarget(mThirdButton);
        fourth.setStartDelay(150).addTarget(mFourthButton);

        mStaggeredTransition.addTransition(first).addTransition(second).addTransition(third).
                addTransition(fourth);
    }

    private void alignButtons(boolean left, boolean top) {
        LayoutParams params;

        // 触发转换以在下一次布局传递后运行
        if (mStaggerCB.isChecked()) {
            TransitionManager.beginDelayedTransition(mSceneRoot, mStaggeredTransition);
        } else {
            TransitionManager.beginDelayedTransition(mSceneRoot);
        }

        // 更改按钮堆栈的布局参数
        int oldAlignmentLR = left ? ALIGN_PARENT_RIGHT : ALIGN_PARENT_LEFT;
        int newAlignmentLR = left ? ALIGN_PARENT_LEFT : ALIGN_PARENT_RIGHT;
        int oldAlignmentTB = top ? ABOVE : BELOW;
        int newAlignmentTB = top ? BELOW : ABOVE;

        params = (LayoutParams) mFirstButton.getLayoutParams();
        params.addRule(top ? ALIGN_PARENT_BOTTOM : BELOW, 0);
        params.addRule(oldAlignmentLR, 0);
        params.addRule(top ? BELOW : ALIGN_PARENT_BOTTOM, top ? R.id.staggerCB : 1);
        params.addRule(newAlignmentLR);
        mFirstButton.setLayoutParams(params);

        params = (LayoutParams) mSecondButton.getLayoutParams();
        params.addRule(oldAlignmentLR, 0);
        params.addRule(oldAlignmentTB, 0);
        params.addRule(newAlignmentLR);
        params.addRule(newAlignmentTB, R.id.firstButton);
        mSecondButton.setLayoutParams(params);

        params = (LayoutParams) mThirdButton.getLayoutParams();
        params.addRule(oldAlignmentLR, 0);
        params.addRule(oldAlignmentTB, 0);
        params.addRule(newAlignmentLR);
        params.addRule(newAlignmentTB, R.id.secondButton);
        mThirdButton.setLayoutParams(params);

        params = (LayoutParams) mFourthButton.getLayoutParams();
        params.addRule(oldAlignmentLR, 0);
        params.addRule(oldAlignmentTB, 0);
        params.addRule(newAlignmentLR);
        params.addRule(newAlignmentTB, R.id.thirdButton);
        mFourthButton.setLayoutParams(params);
    }