import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

public class SecondActivity extends AppCompatActivity implements
    AdapterView.OnItemSelectedListener {
Button btn2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);
    btn2 = (Button)findViewById(R.id.button1);
    btn2.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // get the text from the EditText
            EditText etUsername =
(EditText)findViewById(R.id.etUsername);
            String stringToPassBack = etUsername.getText().toString();
            // put the string to pass back into an intent and close
this activity
            Intent myIntent1 = getIntent();
            myIntent1.putExtra("@string/user", stringToPassBack);
            // get the text
            EditText etPassword =
(EditText)findViewById(R.id.etPassword);
            String stringToPassBack1 =
etPassword.getText().toString();
            // put the string to pass back
            Intent myIntent2 = getIntent();
            myIntent2.putExtra("@string/pass", stringToPassBack1);
            // get the text
            EditText etEmail = (EditText)findViewById(R.id.etEmail);
            String stringToPassBack2 = etEmail.getText().toString();
            // put the string to pass back
            Intent myIntent3 = getIntent();
            myIntent3.putExtra("@string/email", stringToPassBack2);

            // Adding the spinner
            Spinner spinner1 = (Spinner)findViewById(R.id.spinner);
            // Create an ArrayAdapter using the string array and a
default spinner layout
            ArrayAdapter<?> adapter =
ArrayAdapter.createFromResource(SecondActivity.this,
                    R.array.select_length,
android.R.layout.simple_spinner_item);
            //Specify the layout to use when the list of choices
appears
            adapter.setDropDownViewResource(android.R.layout.
simple_spinner_dropdown_item);
            // Apply the adapter to the spinner
            spinner1.setAdapter(adapter);

            String stringToPassBack3 =
spinner1.getSelecetedItem().toString();
            Intent myIntent4 = getIntent();
            myIntent4.putExtra("@string/spinner_title",
stringToPassBack3);

            // close activity
            setResult(RESULT_OK, myIntent1);
            finish();
        }
    });
}

@Override
public void onItemSelected(AdapterView<?> spinner, View view, int pos,
long id) {
    spinner = (Spinner)findViewById(R.id.spinner);
    spinner.setOnClickListener((View.OnClickListener) this);
    String item = spinner.getItemAtPosition(pos).toString();
    Toast.makeText(spinner.getContext(), "selected:" + item,
Toast.LENGTH_LONG).show();
}



@Override
public void onNothingSelected(AdapterView<?> spinner) {

}
}

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
private static final int SECOND_ACTIVITY_RESULT_CODE = 0;
Button btn;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn = (Button)findViewById(R.id.button);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent myIntent = new Intent(MainActivity.this,
                    SecondActivity.class);
            startActivityForResult(myIntent,
SECOND_ACTIVITY_RESULT_CODE);
        }
    });
}
// This method is called when the second activity finishes
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    // Check that it is the SecondActivity with an OK result
    if (requestCode == SECOND_ACTIVITY_RESULT_CODE) {
        if (resultCode == RESULT_OK) {
            // Get String data from Intent
            String etUsername = data.getStringExtra("@string/user");
            // Set text view with string
            TextView textView = (TextView)findViewById(R.id.textView);
            textView.setText(etUsername); {
                String etPassword =
data.getStringExtra("@string/pass");
                TextView textView1 =
(TextView)findViewById(R.id.textView1);
                textView1.setText(etPassword); {
                    String etEmail =
data.getStringExtra("@string/email");
                    TextView textView2 =
(TextView)findViewById(R.id.textView2);
                    textView2.setText(etEmail); {
                        String spinner =
data.getStringExtra("@string/spinner_title");
                        TextView textView3 =
(TextView)findViewById(R.id.textView3);
                        textView3.setText(spinner);
                    }
                }
            }
        }
    }
}
}

<Spinner
    android:id="@+id/spinner"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:prompt="@string/spinner_title"
    android:entries="@array/select_length"
    android:spinnerMode="dropdown"
    android:layout_toEndOf="@+id/etEmail"
    android:layout_marginStart="23dp"
    android:layout_below="@+id/etPassword"
    android:layout_above="@+id/button1">
</Spinner>

<TextView
    android:id="@+id/textView3"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView1"
    android:layout_toEndOf="@+id/text" />