What is the differences between onAttach() and isAdded() in android Fragment?

问题

Can anyone tell me what are the different of use of onAttach() and isAdded in Android Fragment?

When create a new fragment onAttach() method creating default.

I checked this question, the question is asked about !onDetech() and isAdded() , also one answer there, but I am not clear with that.. Thanks

回答1:

This could be answered simply reading javadocs:

    /**
     * Called when a fragment is first attached to its context.
     * {@link #onCreate(Bundle)} will be called after this.
     */
    public void onAttach(Context context) 

and

    /**
     * Return true if the fragment is currently added to its activity.
     */
    final public boolean isAdded()

回答2:

onAttach() is called when a fragment is connected to an activity. Where isAdded() override method will come up with true if it is connected successfully to an activity.

回答3:

• onAttach()

Called when a fragment is first attached to its context. onCreate(Bundle) will be called after this.

• isAdded ()

Return true if the fragment is currently added to its activity.

来源：https://stackoverflow.com/questions/52607945/what-is-the-differences-between-onattach-and-isadded-in-android-fragment