CODEWITHSUNDEEP
androidlistviewandroid-fragmentsandroid-listviewandroid-arrayadapter
Solace
Solace

Reputation: 9020

Android onListItemClick: How to get an object whose fields are displayed in the ListView item which was clicked?

I have an ArrayList of objects of class MyClass, each of which has four fields (namely firstItem, secondItem, thirdItem and fourthItem), the first three of which need to be displayed in the ListView of a ListFragment. For this, I have extended the ArrayAdapter, and overridden its getView() method, as follows:

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View view;

    if (convertView == null) {
        view = layoutInflater.inflate(
                R.layout.myFragment_listview_item, parent, false);
    } else {
        view = convertView;
    }

    MyClass myClassItem = getItem(position);//******But this method is inside Adapter

    ((TextView) view
            .findViewById(R.id.myclassListFragment_ListViewItem1))
            .setText(myClassItem.firstItem);
    ((TextView) view
            .findViewById(R.id.myclassListFragment_ListViewItem2))
            .setText(myClassItem.secondItem);
    ((TextView) view
            .findViewById(R.id.myclassListFragment_ListViewItem3))
            .setText(myClassItem.thirdItem);

    return view;
}

But when the user clicks an item from the ListView, the fourthItem field for the object whose other fields are displayed as that clicked listview item, should be displayed (in a TextView) in a separate Fragment (detailsFragment).

The program adds the new fragment on the click of an item from the ListView as follows, But the question is that how do I get the value of fourthItem field for the MyClass object whose corresponding ListView item had been clicked by the user, so that I can set it in a TextView in the detailsFragment?

In the mentioned first ListFragment:

The ListFragment implements LoaderManager.LoaderCallBacks<List<MyClass>>, which means that the List containing the MyClass objects is passed to the LoaderManager.LoaderCallBacks's onLoadFinished() method:

 @Override
    public void onLoadFinished(Loader<List<MyClass>> loader, List<MyClass> dataList) {
      customArrayListAdapter.setData(dataList);
      if (isResumed()) {setListShown(true);} else {setListShownNoAnimation(true);}
    }

We have onListItemClick() method, which instantiates the new detailsFragment to display fourthItem in it:

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    showDetailsFragment(position);
}

private void showDetailsFragment(int index) {
    listViewItemPosition = index;
    DetailsFragment detailsFragment = DetailsFragment.newInstance(index);
    FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
    fragmentTransaction.replace(R.id.myActivity_frameLayout1, detailsFragment);
    fragmentTransaction.commit();
}

Upvotes: 0

Views: 1005

Answers (3)

Rohit5k2
Rohit5k2

Reputation: 18112

Change your method like this

private void showDetailsFragment(int index) {
    String fourthItem = ((MyClass)getListAdapter().getItem(index)).fourthItem;
    DetailsFragment detailsFragment = DetailsFragment.newInstance(fourthItem);
    FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
    fragmentTransaction.replace(R.id.myActivity_frameLayout1, detailsFragment);
    fragmentTransaction.commit();
}

After this you will have to change the type of parameter passed in newInstance() of DetailsFragment to String and simply display that.

Upvotes: 1

ρяσѕρєя K
ρяσѕρєя K

Reputation: 132992

You can get selected row item object from ListView by calling getItem method of Adapter using getListAdapter as:

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
   MyClass class = (MyClass)getListAdapter().getItem(position);
}

Upvotes: 3

RajaReddy PolamReddy
RajaReddy PolamReddy

Reputation: 22493

By using setTag() and getTag() mechanism to make your views remember something, that could be an object an integer a string or anything you like.

set this in getView() 

 view.SetTag(myClassItem );

use getTag() in onItemClickListener() to retrieve data from item 

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
   MyClass class = (MyClass) v.getTag();
}

Upvotes: 1

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