### opdracht 3 ###

### activity_second.xml ###

<androidx.constraintlayout.widget...>

	...

	<Button
	    android:id="@+id/button1"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:layout_marginTop="56dp"
	    android:onClick="startMainActivity"
	    android:text="Naar eerste scherm"
	    app:layout_constraintTop_toTopOf="parent"
	    tools:layout_editor_absoluteX="0dp" />

    ...

</androidx.constraintlayout.widget.ConstraintLayout>

### SecondActivity.java ###

public class SecondActivity extends AppCompatActivity {

	...

    public void startMainActivity(View view) {
        Intent intent = new Intent(this, MainActivity.class);
        startActivity(intent);
    }

    ...

}