关于fragmentPagerAdapter的冲突问题

fragmentPagerAdapter是继承了PagerAdapter，这个类的作用就是用于滑动跳转Fragment，但是这个类是V4包里独有的，

android app包里并没有这个类，那么问题就来了，当自己前面用的Fragment以及fragmentmanager都是app包下的，两者无法兼容，那该怎么办？

本人找了两种办法解决这个方案：第一种便是将所有的fragment全部换成V4包下的，但是这样也会有许多不兼容的因素出现。

第二种就是打开fragmentPagerAdapter这个类的源码，然后自己新建一个类，将它copy到这个类里，然后将里面所有V4的包全部改成app的，代码如下：

public class MyPageAdapter extends PagerAdapter {

private final FragmentManager mFragmentManager;
private FragmentTransaction mCurTransaction = null;
private Fragment mCurrentPrimaryItem = null;
private List<Fragment> fragmentList;

public MyPageAdapter(FragmentManager fm, List<Fragment> fragmentList) {
mFragmentManager = fm;
this.fragmentList = fragmentList;
}

public Fragment getItem(int position) {

return fragmentList.get(position);
}

@Override
public int getCount() {
return fragmentList.size();
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
if (mCurTransaction == null) {
mCurTransaction = mFragmentManager.beginTransaction();
}

final long itemId = getItemId(position);

// Do we already have this fragment?
String name = makeFragmentName(container.getId(), itemId);
Fragment fragment = mFragmentManager.findFragmentByTag(name);
if (fragment != null) {
mCurTransaction.attach(fragment);
} else {
fragment = getItem(position);
mCurTransaction.add(container.getId(), fragment,
makeFragmentName(container.getId(), itemId));
}
if (fragment != mCurrentPrimaryItem) {
fragment.setMenuVisibility(false);
fragment.setUserVisibleHint(false);
}

return fragment;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
if (mCurTransaction == null) {
mCurTransaction = mFragmentManager.beginTransaction();
}
mCurTransaction.detach((Fragment)object);
}

@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
Fragment fragment = (Fragment)object;
if (fragment != mCurrentPrimaryItem) {
if (mCurrentPrimaryItem != null) {
mCurrentPrimaryItem.setMenuVisibility(false);
mCurrentPrimaryItem.setUserVisibleHint(false);
}
if (fragment != null) {
fragment.setMenuVisibility(true);
fragment.setUserVisibleHint(true);
}
mCurrentPrimaryItem = fragment;
}
}

@Override
public void finishUpdate(ViewGroup container) {
if (mCurTransaction != null) {
mCurTransaction.commitAllowingStateLoss();
mCurTransaction = null;
mFragmentManager.executePendingTransactions();
}
}

@Override
public boolean isViewFromObject(View view, Object object) {
return ((Fragment)object).getView() == view;
}

@Override
public Parcelable saveState() {
return null;
}

@Override
public void restoreState(Parcelable state, ClassLoader loader) {
}

/**
* Return a unique identifier for the item at the given position.
*
* <p>The default implementation returns the given position.
* Subclasses should override this method if the positions of items can change.</p>
*
* @param position Position within this adapter
* @return Unique identifier for the item at position
*/
public long getItemId(int position) {
return position;
}

private static String makeFragmentName(int viewId, long id) {
return "android:switcher:" + viewId + ":" + id;
}
}
如此便解决了fragmentPagerAdapter冲突的问题。