来自Context的FragmentManager

Question

我创建了一个新View课程.在那个课程中,我需要访问FragmentManager,但我无法弄清楚如何.

我可以FragmentManager从上下文中访问吗？

CustomView extends LinearLayout

Answer 1

仅当给定的Context扩展Activity(After-Honeycomb)或FragmentActivity(pre-honeycomb)时.

在这种情况下,您必须100%确定它是使用反射或try-catch的活动.

try{
  final Activity activity = (Activity) context;

  // Return the fragment manager
  return activity.getFragmentManager();

  // If using the Support lib.
  // return activity.getSupportFragmentManager(); 

} catch (ClassCastException e) {
  Log.d(TAG, "Can't get the fragment manager with this");
}

我以为我推荐重构,所以View实际上只是为了显示内容而不应该实际修改应用程序的状态,但这是我的看法.

Answer 2

如果您使用支持片段,您可能实际上想要:

try {
  FragmentManager fragmentManager = ((FragmentActivity) context).getSupportFragmentManager();
} catch (ClassCastException e) {
  Log.e(TAG, "Can't get fragment manager");
}

Answer 3

这对我有用:

Context mContext;
...


//Get FragmentManager
FragmentManager fragmentManager = ((Activity) mContext).getFragmentManager();

(当然你必须首先初始化mContext)