fragment在onAttach后才获取activity，所以你可以在onAttach里初始化，或者在其后的生命周期里初始化，在onAttach之前getActivity是肯定不行的 Override public void onAttach(Activity activity) { super.onAttach(activity);}
FragmentController的getSupportFragmentManager是通过构造函数的参数FragmentHostCallback对象的getFragmentMnaagerIml得到: publicabstractclassFragmentHostCallback<E>extendsFragmentContainer{privatefinalActivity mActivity;finalContext mContext;privatefinalHandler mHandler;finalintmWindowAnimations;finalFragmentManagerImplmFragmen...
总结:Fragment中的mActivity和mContext是在FragmentActivity赋值的 延伸思考 Context来自于mHost.getContext(),转向mHost从什么地方赋值,发现来自于FragmentStateManager classFragmentStateManager{privatefinalFragment mFragment; ... FragmentStateManager(@NonNullFragmentLifecycleCallbacksDispatcher dispatcher,@NonNullFragment ...
I'm writing a custom native android library that exposes a support fragment for display. I created a simple view manager on the android side of react in which I return a placeholder layout in createViewInstance and later intend to add th...
Is it possible for me to retrieve theFragmentManagerfrom a context? CustomView extends LinearLayout Solution 1: The Context must be an extension of Activity, either Post-Honeycomb or fragmentactivity for pre-Honeycomb. If that is the scenario, it is necessary to ensure with absolute certainty tha...
NetExtensionGetFragmentReturnContext 函数检索 net 片段的返回上下文扩展信息。语法C++ 复制 EXTERN_C_START NET_FRAGMENT_RETURN_CONTEXT * NetExtensionGetFragmentReturnContext( NET_EXTENSION const *Extension, UINT32 Index ); 参数Extension指向NET_EXTENSION 结构的指针,该结构描述此片段的返回上...
如何通过context得到getfragmentmanager fragment在onAttach后才获取activity,所以你可以在onAttach里初始化,或者在其后的生命周期里初始化,在onAttach之前getActivity是肯定不行的@Override public void onAttach(Activity activity) { super.onAttach(activity); }
activity);if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) { onAttachToContext(activity);} } / Called when the fragment attaches to the context / protected void onAttachToContext(Context context) { //do something } 在用Fragment时，这样复写onAttach方法就可以减少API的影响了。
在把java代码转换成kotlin的过程中,发现kotlin的一些代码逻辑和java不同。在Fragment的ViewHolder,onCreateViewHolder中,java可以通过getFragementManager().findFragmentById()来获取某一个Fragment实例。但是这个方法在kotlin中无效,根本就调用不了这个方法。
Glide.with((getContext())).load(user.getImgURl()).into(image_profile);上面的行将 getContext 作为 null 返回,因此允许应用程序崩溃。我已将其添加到 onDataChange 方法下的片段中,如下所示。public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle saved...