如何将数据从片段传递到活动？

Question

I'm new at Android. I want to pass data from a fragment to another Activity. This fragment is displayed on MainActivity and I need to pass data to DetalleActividadActivity .

This is my fragment's code:

public final static String EXTRA_PARAMETER = "com.example.arc3labswtm_android.customs.PARAMETER";


@Override
public void onActivityCreated(Bundle savedInstanceState) 
{
    super.onActivityCreated(savedInstanceState); 


    mAdapter = new ActivitiesAdapter(getActivity(), R.layout.act_itemlist);
      ListView listViewToDo = (ListView) getView().findViewById(R.id.activities_fragment_list);
      listViewToDo.setAdapter(mAdapter);
      listViewToDo.setOnItemClickListener(new OnItemClickListener(){
            public void onItemClick(AdapterView<?> parent, View view, int position,long id)
            {

                final Activities currentItem = mAdapter.getItem(position);
                String pid = currentItem.getId();
                Intent newActivity = new Intent(view.getContext(), DetalleActividadActivity.class);
                startActivity(newActivity);
                newActivity.putExtra(EXTRA_PARAMETER, pid);
            }
        });
      refreshItemsFromTable();
}

This is my Activity's code:

public class DetalleActividadActivity extends ActionBarActivity 
{
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_detalle_actividad);

        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);

        Intent intent = getIntent();
        String parameter = intent.getStringExtra(ActivitiesFragment.EXTRA_PARAMETER);


    }
}

Any ideas? I don't know if this has something to do but my Activities are in this package: com.example.arc3labswtm_android

And my fragment is in this: com.example.arc3labswtm_android.customs

I don't know if that is why EXTRA_PARAMETER does not work.

When I get to the DetalleActividadActivity the parameter is always null.

Please help!.

Answer 1

The problem is , you have put the EXTRA_PARAMETER to the IntentExtras after the Activity start

You need to put the Extras to the intent before you start the activity.

You can pass the data through intent when you start the Activity from Fragment like this

 Intent newActivity = new Intent(getActivity(), DetalleActividadActivity.class);
 newActivity.putExtra(EXTRA_PARAMETER, pid);
 startActivity(newActivity);

When the Activity is Created , you can retrieve the data like this

 String parameter = getIntent().getStringExtra(ActivitiesFragment.EXTRA_PARAMETER);