如何混合使用android.support.v4.app.Fragment和android.app.Fragment [英] How to mix android.support.v4.app.Fragment and android.app.Fragment

问题描述

在尝试与标签一起使用com.here.android.mapping.MapFragment时遇到问题.

I'm having a problem with com.here.android.mapping.MapFragment when trying to use it with tabs.

问题来了，因为不推荐使用TabActivity(我知道它仍然可以工作，但是需要一个面向未来的解决方案)，并且FragmentTabHost似乎要求使用v4片段(如果该片段是从另一个片段派生的，则会崩溃) )，然后当我尝试在选项卡片段之一的布局中使用com.here.android.mapping.MapFragment时，由于(MapFragment)getFragmentManager().findFragmentById( )行出现错误，表示无法强制转换为MapFragment.

The issue comes that since the TabActivity is deprecated(I know it still works, but need a future proof solution), and FragmentTabHost appears to be requiring the v4 fragment to be used (it crashes if the fragment is derived from other one) , then when I try having the com.here.android.mapping.MapFragment used in a layout of one of the tab fragments, then I can not retrieve it for the required initialization, since the (MapFragment) getFragmentManager().findFragmentById() line has error indicating that the casting to MapFragment can not be made.

我想问题是MapFragment是从android.app.Fragment派生的，而findFragmentById期望返回android.support.v4.app.Fragment的混合，所以问题就在于如何使这种混合物平稳运行在一起吗?

I suppose the issue is that MapFragment is derived from android.app.Fragment and the findFragmentById expects to return mix android.support.v4.app.Fragment, so the question would be on how could I get this mixture to run smoothly together ?

推荐答案

android.support.v4.app.Fragment和android.app.Fragment类不能互换使用.

The android.support.v4.app.Fragment and the android.app.Fragment classes can't be used interchangeably.

诺基亚创建了android.support.v4.app.Fragment的nofollow> com.here.android.mapping.MapCompatibilityFragment -如果您的应用程序使用支持片段，则使用它.

Nokia have created com.here.android.mapping.MapCompatibilityFragment which extends android.support.v4.app.Fragment - use that instead if your app uses support fragments.

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