Pass data from activity to fragments [closed]

Hello! Given the absence of code to more or less visualize the specific problem you have, I will describe the simplest method to pass data between components of your application using Bundle .

In your particular case, you want to pass information from the text field of a Activity (via a button) to another activity that manages the Fragment where you want to display the information from your first activity.

Since your first activity ( ActivityA in this example):

@Override
protected void onCreate(Bundle savedInstanceState) {

    //...

    Button button = (Button) findViewById(R.id.button_id);

    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            // Una vez receptemos el evento, usaremos Bundle e Intent para pasar datos de una Activity a otra
            // Inicializas el Bundle
            Bundle bundle = new Bundle();

            // Inicializas el Intent
            Intent intent = new Intent(v.getContext(), ActivityB.class);

            // Información del EditText
            EditText editText = (EditText) findViewById(R.id.editText);
            String texto = editText.getText().toString();

            // Agregas la información del EditText al Bundle
            bundle.putString("textFromActivityA", texto);
            // Agregas el Bundle al Intent e inicias ActivityB
            intent.putExtras(bundle);
            startActivity(intent);
        }
    });

    // ...

}    

In the second activity ( ActivityB in this example), in the onCreate() method, you must use the "textFromActivityA" key that you previously defined about the incoming Bundle (you get it from Intent ) in order to obtain the String that you require, and so use it in other parts of your activity. In this way:

@Override
protected void onCreate(Bundle savedInstanceState) {

    // ... 

    // Obtienes el Bundle del Intent
    Bundle bundle = getIntent().getExtras();

    // Obtienes el texto
    String texto = bundle.getString("textFromActivityA");

    // Creamos un nuevo Bundle
    Bundle args = new Bundle();

    // Colocamos el String
    args.putString("textFromActivityB", texto);

    // Supongamos que tu Fragment se llama TestFragment. Colocamos este nuevo Bundle como argumento en el fragmento.
    TestFragment newFragment = new TestFragment();
    newFragment.setArguments(args);

    //Una vez haz creado tu instancia de TestFragment y colocado el Bundle entre sus argumentos, usas el FragmentManager para iniciarla desde tu segunda actividad.
    FragmentManager fm = getFragmentManager();
    FragmentTransaction fragmentTransaction = fm.beginTransaction();
    fragmentTransaction.replace(R.id.fragmentContainer_id, newFragment); //donde fragmentContainer_id es el ID del FrameLayout donde tu Fragment está contenido.
    fragmentTransaction.commit();

    // ...

}

Then, in the method onCreateView() of Fragment :

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {

    //Primero inflamos la vista del Fragment para que podamos acceder a los elementos propios del layout donde quisieras mostrar los datos que le llegan al Fragment.
    View v = inflater.inflate(R.layout.fragmentLayout, container, false); //donde fragmentLayout es la referencia a tu archivo XML con el layout del Fragment.

    String texto = getArguments().getString("textFromActivityB");

    //...

    return v;
}

Assuming you have correctly attached the references of your elements (in this case your Button and EditText ), you should not have problems.

I recommend that you review this link that describes in more detail the process of communication between components: link .

If you do not want to use a Bundle , you can access the Activity that contains your Fragment .

• With Fragment#getActivity() you can access the activity that contains your fragment.
• If you access the activity in Fragment#onActivityCreated(Bundle savedState) you can be sure that the creation of your activity is already finished.

Example in your fragment:

@Override
public onActivityCreated(Bundle savedState){
    String cadena = getActivity().mStringCadenaEnActivity;
    // ahora puedes trabajar con el dato leido de un campo de la actividad
}