Pass data between Fragments

Question

Here’s what I need: I have an applicationActicitythis is the main and controls the entire application, also I have some fragments2 of them are interface other 2 run in the background.

The question is the following need to pass data fromFragmentAto the FragmentB,only that the moment I try to make this mistake, I tried to guide the objecttried getter and settertried Bundle e intentbut the error persists.

the idea then is to make fragment1 pass data pro fragment2 to main Activity contains running normally in background.

someone help me?

Answer 1

Bundle only dates to another Fragment if the same has not passed through the attach. Fragment does not communicate directly with another Fragment , Fragment has to communicate with Activity and Activity communicates with Fragment B (if the 2 Fragments are Up and running), for that you have to use an interface .

example:

1) Interface

public interface OnCommunicateInterface
{
    void onSetText(String str);
}

2) Mainactivity

public class MainActivity extends FragmentActivity implements OnCommunicateInterface
{

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

    @Override
    public void onSetText(String str)
    {
        FragmentReceiveData f2 = (FragmentReceiveData) getSupportFragmentManager().findFragmentById(R.id.frag_rec_data);
        f2.updateText(str);
    }

}

3) Fragment that will send Date

public class FragmentSendData extends Fragment
{
    EditText editText;
    Button button;
    OnCommunicateInterface onCommunicate;

    @Override
    /****************** onCreateView *****************/
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle b)
    {
        View v = inflater.inflate(R.layout.fragment_send_data,container,false);

        editText = (EditText)v.findViewById(R.id.editText);
        button = (Button)v.findViewById(R.id.button);

       View.OnClickListener listener = new View.OnClickListener()
       {
           @Override
           public void onClick(View v)
           {
               String str = editText.getText().toString();
               onCommunicate.onSetText(str);
           }
       };

       button.setOnClickListener(listener);

       // Inflate the layout for this fragment
       return (v);
    }

    @Override
    /**************** onAttach **************/
    public void onAttach(Context context)
    {
        super.onAttach(context);

        try
        {
            onCommunicate = (OnCommunicateInterface) context;
        }
        catch (Exception e)
        {
            Log.e("onAttach",e.toString());
        }
    }
}

4) Fragment to receive Date

public class FragmentReceiveData extends Fragment
{
    TextView textView;

    @Override
    /************** onCreateView() ******************/
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState)
    {
        View v = inflater.inflate(R.layout.fragment_receive_data,container,false);

        textView = (TextView)v.findViewById(R.id.text_view);

        // Inflate the layout for this fragment
        return (v);
    }
    /*************** updateText() ********************/
    public void updateText(String string)
    {
        textView.setText(string);
    }
}

The cidogo is rather ugly , but it is easy to understand and it is a simple example.

hope it helps .

Answer 2

Fala Roger,

To pass data between Fragments, do the following, the moment you use Fragmentmeneger you have to create a Bundle and pass together, example:

Fragment myFrag = new MyFragment();

Bundle bundle = new Bundle();
bundle.putString("username", user_ame);
bundle.putString("senha", user_pass);
myFrag.setArguments(bundle);

FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.container, myFrag).commit();

Hugs.

Answer 3

There are several ways to do this.

Shared Preferences Stores proven primitive data in key-value pairs.

Internal Storage Stores private data in device memory.

Sqlite Databases Stores structured data in a private database.

And also how Leonardo Dias posted using the Bundle. There goes your usefulness and know which to use.