private String mFillAddrField = "";
...
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
        if(data == null) {
            ...
        } else {
            Bundle b = data.getExtras(); //DATA retrieved from second activity successfully
            mFillAddrField = b.getString("address");
        }
    }
}

...
public void displayAddScreen() {
    AlertDialog.Builder alert = new AlertDialog.Builder(this);

    alert.setTitle("Create a new Grocery Store");
    alert.setMessage("Create a new store by filling out the form below.");

    LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
    View layout = inflater.inflate(R.layout.newstore_dialog, (ViewGroup) findViewById(R.id.nsd_root));

    final EditText nameField = (EditText) layout.findViewById(R.id.nsd_et_name);
    final EditText addrField = (EditText) layout.findViewById(R.id.nsd_et_address);
    final Button addrSelect = (Button) layout.findViewById(R.id.nsd_b_address);

    alert.setView(layout);

    addrSelect.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            //Open MAPS API return me an address
            //Save address to text field
            Intent i = new Intent(getApplicationContext(), GroceryMapActivity.class);
            startActivityForResult(i,0);
            addrField.setText(mFillAddrField); //OFFENDING CODE HERE
        }
    });

private String mFillAddrField = "";
EditText addrField;
...
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
        if(data == null) {
            ...
        } else {
            Bundle b = data.getExtras(); //DATA retrieved from second activity successfully
            mFillAddrField = b.getString("address");
            addrField.setText(mFillAddrField);
        }
    }
}

...
public void displayAddScreen() {
AlertDialog.Builder alert = new AlertDialog.Builder(this);

alert.setTitle("Create a new Grocery Store");
alert.setMessage("Create a new store by filling out the form below.");

LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.newstore_dialog, (ViewGroup) findViewById(R.id.nsd_root));

final EditText nameField = (EditText) layout.findViewById(R.id.nsd_et_name);
addrField = (EditText) layout.findViewById(R.id.nsd_et_address);

final Button addrSelect = (Button) layout.findViewById(R.id.nsd_b_address);

alert.setView(layout);

addrSelect.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        //Open MAPS API return me an address
        //Save address to text field
        Intent i = new Intent(getApplicationContext(), GroceryMapActivity.class);
        startActivityForResult(i,0);
    }
});