I would like to create a TextView (or any other view) programatically using the constraint layout. The textView would look like this in XML:
<TextView
android:id="@+id/textView_Test"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test "
android:textSize="19sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintVertical_bias="0.16"
app:layout_constraintHorizontal_bias="0.02"
app:layout_constraintTop_toTopOf="parent" />
So it should be constrained to the parents in all sides and then I can use the bias parameters to change its position dynamically. How can I implement this? I had a look at the answers given here ConstraintLayout: change constraints programmatically but there the objects are not constrained to the parents and no vertical and horizontal bias is used to position it dynamically as I am intending. Any idea if and how this would be possible within a Fragment (I use the Single-Activity Multiple-Fragments approach)?
Update:
I could now insert a custom view (instead of a TextView) inside a constrained layout programmatically. However, setting the orientation using the code constraintSet.setHorizontalBias(view.getId(), 0.56f);does not have any effect (no mather, which numbers I use). The custom view is always at the top left corner.
Here you can see the code of the whole fragment(I denoted the important part):
public class Test extends Fragment implements Runnable {
/*
Game variables
*/
public static final int DELAY_MILLIS = 100;
public static final int TIME_OF_A_LEVEL_IN_SECONDS = 90;
private int currentTimeLeftInTheLevel_MILLIS;
private Handler handler = new Handler();
private FragmentGameBinding binding;
private boolean viewHasBeenCreated = false;
public Test() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
binding = FragmentGameBinding.inflate(inflater, container, false);
container.getContext();
viewHasBeenCreated = true;
startRound();
return binding.getRoot();
}
public void startRound () {
currentTimeLeftInTheLevel_MILLIS =TIME_OF_A_LEVEL_IN_SECONDS * 1000;
updateScreen();
handler.postDelayed(this, 1000);
}
private void updateScreen() {
binding.textViewTimeLeftValue.setText("" + currentTimeLeftInTheLevel_MILLIS/1000);
/*
IMPORTANT PART: This should create a simple custom UI element
*/
View view = new View(getActivity());
view.setLayoutParams(new ViewGroup.LayoutParams(200, 200));
Drawable dr = ContextCompat.getDrawable(getActivity(),R.drawable.light_bulb_layer_list);
view.setBackground(dr);
view.setId(View.generateViewId());
ConstraintLayout constraintLayout = binding.constraintLayout;
ConstraintSet constraintSet = new ConstraintSet();
constraintSet.clone(constraintLayout);
constraintSet.connect(view.getId(),ConstraintSet.BOTTOM, ConstraintSet.PARENT_ID,ConstraintSet.BOTTOM,0);
constraintSet.connect(view.getId(),ConstraintSet.TOP,ConstraintSet.PARENT_ID ,ConstraintSet.TOP,0);
constraintSet.connect(view.getId(),ConstraintSet.LEFT,ConstraintSet.PARENT_ID ,ConstraintSet.LEFT,0);
constraintSet.connect(view.getId(),ConstraintSet.RIGHT,ConstraintSet.PARENT_ID ,ConstraintSet.RIGHT,0);
constraintSet.setHorizontalBias(view.getId(), 0.56f);
constraintSet.setVerticalBias(view.getId(), 0.5f);
constraintSet.applyTo(constraintLayout);
constraintLayout.addView(view);
}
private void countDownTime(){
currentTimeLeftInTheLevel_MILLIS = currentTimeLeftInTheLevel_MILLIS -DELAY_MILLIS;
updateScreen();
}
@Override
public void run() {
if(viewHasBeenCreated) {
countDownTime();
}
Any ideas why setting the horizontal or vertical orientation in the constraint layout does not have any effect?
