SlidingFragments.java 文件源码

/**
 * This method is used to toggle between the two fragment states by
 * calling the appropriate animations between them. The entry and exit
 * animations of the text fragment are specified in R.animator resource
 * files. The entry and exit animations of the image fragment are
 * specified in the slideBack and slideForward methods below. The reason
 * for separating the animation logic in this way is because the translucent
 * dark hover view must fade in at the same time as the image fragment
 * animates into the background, which would be difficult to time
 * properly given that the setCustomAnimations method can only modify the
 * two fragments in the transaction.
 */
private void switchFragments () {
    if (mIsAnimating) {
        return;
    }
    mIsAnimating = true;
    if (mDidSlideOut) {
        mDidSlideOut = false;
        getFragmentManager().popBackStack();
    } else {
        mDidSlideOut = true;

        AnimatorListener listener = new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator arg0) {
                FragmentTransaction transaction = getFragmentManager().beginTransaction();
                transaction.setCustomAnimations(R.animator.slide_fragment_in, 0, 0,
                        R.animator.slide_fragment_out);
                transaction.add(R.id.move_to_back_container, mTextFragment);
                transaction.addToBackStack(null);
                transaction.commit();
            }
        };
        slideBack (listener);
    }
}