Android get view of fragment in activity [duplicate]

问题

I have an activity, let's call it A, and it launches a fragment like so:

remoteFragment = new RemoteFragment();
getSupportFragmentManager()
        .beginTransaction()
        .replace(R.id.frameLayout_remote_activity, remoteFragment)
        .commit();

my remoteFragment looks something like this:

public Button okBtn;

public RemoteFragment() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_remote, container, false);
    okBtn= view.findViewById(R.id.okBtn);

    return view;
}

public RemoteLayoutView getOkBtn() {
    return okBtn;
}

and in my activity I am trying to get it like so:

Button okBtnMessageNotWorking = remoteFragment.getOkBtn();

but okBtnMessageNotWorking is always null.

my question is how can I get the view objects from the fragment inside my activity?

回答1:

Here, you are trying to find the view from layoutOnTopScrollview. Instead you should find the okBtn from inflated view. Please change code as below:

@Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_remote, container, false);
    okBtn= view.findViewById(R.id.okBtn);

    return view;
}

Also, make sure that you are calling this method once the fragment is created.

来源：https://stackoverflow.com/questions/62406558/android-get-view-of-fragment-in-activity

标签

android

android-fragments

android-activity

fragment

android-fragmentactivity