ViewPager中使用Fragment时防止数据预加载，安卓app开发教程

 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) {

    if (DEBUG) Log.v(TAG, "Attaching item #" + itemId + ": f=" + fragment);

    mCurTransaction.attach(fragment);

} else {

    fragment = getItem(position);

    if (DEBUG) Log.v(TAG, "Adding item #" + itemId + ": f=" + fragment);

    mCurTransaction.add(container.getId(), fragment,

            makeFragmentName(container.getId(), itemId));

}

if (fragment != mCurrentPrimaryItem) {

    fragment.setMenuVisibility(false);

    fragment.setUserVisibleHint(false);

}



return fragment;

}

在instantiateItem方法的最后我们发现了调用