改变片段过渡

Question

我有几个片段，所有的片段都是从左到右进出的。我收到了一个新要求，即几个片段将有不同的退出过渡，而前一个片段将是静态的（不会有过渡）。如下图所示：

如果它有不同的转换，我首先在我的基本片段中添加抽象函数：

public abstract boolean hasDifferentTransitions();

之后我修改了要更改片段的函数：

 public void replaceFragment(int container, Class<?> fragClass, Bundle b,boolean isSplash)
{

    BaseFragment bf = null;
    try
    {
        bf = (BaseFragment) fragClass.newInstance();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }


    String backStateName = bf.getClass().getSimpleName();
    FragmentManager manager = getSupportFragmentManager();
    //checking if I am on the same fragment
    if(_currentFragment!=null)
    {
        String currentFragmentName = _currentFragment.getClass().getSimpleName();
        if(currentFragmentName.equals(backStateName))//not allow same fragment to be twice in backstack one after the other
            return;
    }

    //checking if the "new fragement" is in the backstack if so I will pop out all the fragments till the required one.
    BaseFragment backStackFrag = (BaseFragment) manager.findFragmentByTag(backStateName);
    if(backStackFrag!=null)
    {
        _currentFragment = backStackFrag;
        for(int fIndex=manager.getBackStackEntryCount()-1;fIndex>=0;fIndex--) {
            String currentFragName = manager.getBackStackEntryAt(fIndex).getName();
            if (backStateName.equals(currentFragName)) {
                break;
            }
            manager.popBackStack();
        }
    }
    else {//new fragment - set the transitions by the hasDifferentTransitions returned value
        _currentFragment = bf;
        FragmentTransaction ft = manager.beginTransaction();
        if (isSplash) {
            ft.setTransition(FragmentTransaction.TRANSIT_NONE);
        } else {
            if(bf.hasDifferentTransitions())
            {
                ft.setCustomAnimations(R.anim.enter_from_left, R.anim.exit_to_right,R.anim.enter_from_right,R.anim.exit_to_left);
            }
            else
            {
                ft.setCustomAnimations(R.anim.enter_from_left, R.anim.exit_to_right);
            }
        }
        ft.replace(container, bf, bf.getClass().getSimpleName());
        ft.addToBackStack(bf.getClass().getSimpleName());
        ft.commitAllowingStateLoss();
    }
}

不幸的是，当我在 "special fragment" 然后打开 "regular fragment" 它们都从右向左移动时，它没有按需要工作，有时当我进入 "special fragment" 它打开时没有任何转换

Answer 1

经过多次尝试，我终于实现了这个需求。在我的 baseActivity 中，我添加了一个变量来了解用户何时更改为 "special fragment"

private boolean        _openedSingleFragment;
public boolean openedSingleFragment()
{
    return _openedSingleFragment;
}

public void setOpenedSingleFragment(boolean state)
{
    _openedSingleFragment = state;
}

然后在每个常规片段上我重写 onCreateAnimation 如下：

 @Override
public Animation onCreateAnimation(int transit, boolean enter, int nextAnim) {
    Animation anim = super.onCreateAnimation(transit, enter, nextAnim);
    if(enter && ((BaseActivity)getActivity()).openedSingleFragment())
    {
        anim = new Animation() {};
        anim.setDuration(0);

    }
    return anim;
}

使用此代码，我只是在用户使用特殊片段并打开常规片段时删除输入 transition/animation。

我还在特殊片段中覆盖了onCreateAnimation

 @Override
public Animation onCreateAnimation(int transit, boolean enter, int nextAnim) {
    Animation anim = super.onCreateAnimation(transit, enter, nextAnim);

    if(enter)
    {
        ((BaseActivity)getActivity()).setOpenedSingleFragment(false);
    }
    else
    {
        if (anim == null && nextAnim != 0) {
            anim = AnimationUtils.loadAnimation(getActivity(), R.anim.exit_to_left);
        }
    }

return动画； }

我只是在开始特殊片段的过渡时重置布尔值，当我打开其他片段时我正在加载指定的动画。

改变片段过渡

Changing fragment transitions

android

fragment

android-transitions