### opdracht 1 ###

### activity_main.xml ###

<androidx.constraintlayout.widget...>
  
  	...

	<Button
	    android:id="@+id/button2"
	    android:layout_width="180dp"
	    android:layout_height="50dp"
	    android:layout_marginTop="60dp"
	    android:text="1-non-responsive"
	    app:layout_constraintTop_toBottomOf="@+id/button1"
	    tools:layout_editor_absoluteX="0dp"
	    android:onClick="start1_non_responsive"/>

  	...

</androidx.constraintlayout.widget.ConstraintLayout>

### MainActivity.java ###

public class MainActivity extends AppCompatActivity {

  	...

	public void start1_non_responsive(View view){

	    Intent browserIntent = new Intent("android.intent.action.VIEW",
	    Uri.parse("https://dequeuniversity.com/library/responsive/1-non-responsive"));
	    startActivity(browserIntent);

	}
  
  	...

}