Question

我有几个片段，所有片段都进入了＆amp;从左到右退出。我收到了一个新的要求，即几个片段将具有不同的退出转换，而前一个片段将是静态的（不会有转换）。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();

之后我修改了我正在改变片段的函数：

 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“特殊片段”上然后打开“常规片段”时它们不能正常工作它们都从右向左移动，有时当我进入“特殊片段”时它会打开而没有任何过渡

Answer 1

经过多次尝试，我设法实现了这一要求。在我的baseActivity中，我添加了一个变量来知道用户何时更改为“特殊片段”

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覆盖onCreateAnimation，如下所示：

 @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正在进入的转换/动画。

我还在特殊片段

中覆盖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);
        }
    }

回复动画; }

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

更改片段转换

1 个答案: