With this code, how do I add an item to a list activity from a fragment?

Question

Hello.

I'm having trouble trying to add something to my list activity from my fragment. I believe that you create a mListView member field in your fragment, but I'm clueless as where to go from there. I thought sharing most of the code for my fragment and activity would help:

Fragment:

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_new_note, container, false);

    mNoteTitleEdit = (EditText) view.findViewById(R.id.NoteTitleEdit);
    mNoteDescriptionEdit = (EditText) view.findViewById(R.id.NoteDescriptionEdit);
    mConfirmImageNN = (ImageView) view.findViewById(R.id.ConfirmImageNN);
    mConfirmImageNN.setOnClickListener(this);
    mCancelImageNN = (ImageView) view.findViewById(R.id.CancelImageNN);
    mCancelImageNN.setOnClickListener(this);
    mListView = (ListView) view.findViewById(android.R.id.list);

    return view;
}

@Override
public void onClick(View v) {
    if (v == mConfirmImageNN) {
        String titleText = mNoteTitleEdit.getText().toString();
        String descriptionText = mNoteDescriptionEdit.getText().toString();

        if (v == mConfirmImageNN && titleText.equals("")) {
            noteError();
        } else if (v == mConfirmImageNN && descriptionText.equals("")){
            noteError();
        } else {
            Note note = new Note(titleText, descriptionText);
            goBack();
        }
    }

    if (v == mCancelImageNN) {
        goBack();
    }
}

Activity:

private ListView mListView;
private TextView mEmpty;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mListView = (ListView) findViewById(android.R.id.list);
    mEmpty = (TextView) findViewById(android.R.id.empty);


    ListAdapter adapter = new ListAdapter(this, mList);
    mListView.setAdapter(adapter);
    mListView.setEmptyView(mEmpty);

}

Thanks!

Answer 1 · 2016-09-03T20:47:59Z

September 3, 2016 8:47pm

You can pass any sort of data as an Intent extra. Even custom objects you created yourself, you would just need to take an extra step inside that class to being able to do that , but any sort of primitive type(int(or Integer), boolean(or Boolean), etc, is already built in. It is explained in one of the courses here and you can google passing intent extras and read about it on the android dev site

Answer 2 · 2016-09-03T17:34:44Z

September 3, 2016 5:34pm

I think I am correctly visualizing what you're doing then. You dont need to get a reference to the Activity ListView in the other Activity's fragment then. So you have, say, your MainActivity with a ListView, then you start the other Activity that has the fragment, and you want to be able to get data from that fragment over into MainActivity for use in the ListView there, correct? If thats the case you could just pass data from the fragment as an Intent extra back to MainActivity. You would typically do this through an interface you create between that fragment and its own containing Activity, that Activity would then start your MainActivity and pass the Intent data. Then in MainActivity just call getIntent(), check for null, and pull out your data and add it to the adapter data and update the List. Worst case post a link to a github repo if you have one so I can see the full picture. What you're trying to do should be pretty straight forward.

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With this code, how do I add an item to a list activity from a fragment?

Joe Brown

Joe Brown

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2 Answers

Joe Brown

Joe Brown

dlpuxdzztg

dlpuxdzztg

Joe Brown

Joe Brown

dlpuxdzztg

dlpuxdzztg

Joe Brown

Joe Brown