getLoaderManger（）和getActivity（）之间的差异。getSupportLoaderManager（）内v4.app.Fragment [英] Difference between getLoaderManger() and getActivity().getSupportLoaderManager() inside v4.app.Fragment

问题描述

getLoaderManager（）从 android.support.v4.app.Fragment 和 getSupportLoaderManager （）从 android.support.v4.app.FragmentActivity

难道他们返回同样的事情？在文档中我找不到它。如果不是，它应该可以与支持库从一个片段内部使用？

Do they return the same thing? I couldn't find it in the documentation. If not, which one should be used with the support library from inside a fragment?

推荐答案

他们返回同样的事情 - 一个 android.support.v4.app.LoaderManager

They return the exact same thing - a android.support.v4.app.LoaderManager.

从源头code：<一href=\"http://grep$c$c.com/file/repository.grep$c$c.com/java/ext/com.google.android/android/5.0.0_r1/android/support/v4/app/Fragment.java#Fragment.getLoaderManager%28%29\"相对=nofollow> v4.app.Fragment 实际上回顾主机活动：

From the source code: v4.app.Fragment is actually recalling the host activity:

 public LoaderManager getLoaderManager() {
     if (mLoaderManager != null) {
         return mLoaderManager;
     }
     if (mActivity == null) {
         throw new IllegalStateException(...);
     }

     mLoaderManager = mActivity.getLoaderManager(...);
     return mLoaderManager;
 }

您的活动是presumably延长<一个href=\"http://grep$c$c.com/file/repository.grep$c$c.com/java/ext/com.google.android/android/5.0.0_r1/android/support/v4/app/FragmentActivity.java#FragmentActivity.getSupportLoaderManager%28%29\"相对=nofollow> v4.app.FragmentActivity ，你可以看到 getLoaderManager（）是一个由 getSupportLoaderManager也被称为私有方法（）：

Your activity is presumably extending v4.app.FragmentActivity and you can see that getLoaderManager() is a private method called also by getSupportLoaderManager():

public LoaderManager getSupportLoaderManager() {
    ...
    mLoaderManager = getLoaderManager(...);
    return mLoaderManager;
}

所以：

• 要使用 v4.app.Fragment S，你继承 v4.app.FragmentActivity （ AppCompatActivity 只是一个例子）;


• 双方 v4.app.Fragment.getLoaderManager（）和 v4.app.FragmentActivity.getSupportLoaderManager（）结束会调用完全相同的方法， v4.app.FragmentActivity.getLoaderManager（）。我是pretty确保这两者之间没有什么区别whatshoever。

• To use v4.app.Fragments, you need to subclass v4.app.FragmentActivity (AppCompatActivity is just an example);
• Both v4.app.Fragment.getLoaderManager() and v4.app.FragmentActivity.getSupportLoaderManager() end up calling the same exact method, v4.app.FragmentActivity.getLoaderManager(). I'm pretty sure there is no difference whatshoever between the two.

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