Now we need an activity where we will create a function to insert the user details and save into the database. Right-click on the app folder and create Empty Activity named NewUserActivity.kt like the following screenshot:

Here is the code of the layout of this class named activity_new_user.xml. (The entire code can be found at GitHub link):

----
----
    <EditText
            android:id="@+id/editEmail"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/hint_email"
            android:inputType="textEmailAddress"
            android:padding="5dp"
            android:textSize="18sp" android:layout_marginTop="8dp"
            app:layout_constraintTop_toBottomOf="@+id/editUsername" app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"/>

    <EditText
            android:id="@+id/editContactID"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/hint_contact"
            android:inputType="phone"
            android:padding="5dp"
            android:textSize="18sp" android:layout_marginTop="8dp"
            app:layout_constraintTop_toBottomOf="@+id/editEmail" app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
    />
----
---
    <Button
            android:id="@+id/buttonSave"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorPrimary"
            android:text="@string/button_save"
            android:textColor="@android:color/white"
            android:layout_marginBottom="8dp"
            app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent" android:layout_marginTop="8dp"
            app:layout_constraintTop_toBottomOf="@+id/editAddress" app:layout_constraintVertical_bias="1.0"/>
</android.support.constraint.ConstraintLayout>

Here we have added four EditText where we can input—username, contactNumber, email, address, and a button named buttonSave to save this information into the database.

Here is the code of the NewUserActivity.kt class:

class NewUserActivity : AppCompatActivity(), View.OnClickListener {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_new_user)
        buttonSave.setOnClickListener(this)
    }

    override fun onClick(view: View?) {
        if (view!!.id == R.id.buttonSave){
            val intent = Intent()
            if (isTextFieldEmpty()){
                Snackbar.make(view, "Empty Field", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show()
                setResult(Activity.RESULT_CANCELED, intent)
            } else {
                val users = Users(editUsername.text.toString(),
                    editEmail.text.toString(),
                    editContactID.text.toString(),
                    editAddress.text.toString())

                Log.wtf("CRAY", editUsername.text.toString()+" "+
                        editEmail.text.toString()+" "+
                        editContactID.text.toString()+" "+
                        editAddress.text.toString())

                Log.wtf("CRAY", users.toString())
                // If an instance of this Activity already exists, then it will be moved to the front.
                // If an instance does NOT exist, a new instance will be created.
                intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT)
                intent.putExtra(getString(R.string.result_replay), users)
                setResult(Activity.RESULT_OK, intent)
            }
            finish()
        }
    }

    private fun isTextFieldEmpty(): Boolean {
        return TextUtils.isEmpty(editUsername.text) ||
                TextUtils.isEmpty(editEmail.text) ||
                TextUtils.isEmpty(editContactID.text) ||
                TextUtils.isEmpty(editAddress.text)
    }
}

According to the preceding code:

• Implement the View.OnClickListener and override the onClick(view: View?).
• In the onCreate(),  setOnClickListener() for the buttonSave, and override the onClick(view: View?) that we want to execute with the button. Lastly, we call an Intent, which will change the activity from the UserModel to the MainActivity class. 
• The isTextFieldEmpty() is designed to check whether the EditText fields are empty or not.
• Then we get all the text, make a UserObject, and pass this Parcelable user object to the MainActivity using intent.putExtra(getString(R.string.result_replay), users).