我想使用约束布局以编程方式创建 TextView （或任何其他视图）。 textView 在 XML 中看起来像这样：
<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" />
所以它应该限制在所有方面的父母，然后我可以使用偏差参数来动态改变它的位置。我怎样才能实现这个？我看了这里给出的答案ConstraintLayout：以编程方式更改约束 https://stackoverflow.com/questions/45263159/constraintlayout-change-constraints-programmatically但在那里，对象不受父母的限制，也没有使用垂直和水平偏置来动态定位它，正如我所希望的那样。知道这是否以及如何在片段中实现（我使用单活动多片段方法）？
Update：
我现在可以以编程方式在受约束的布局中插入自定义视图（而不是 TextView）。但是，使用代码设置方向 constraintSet.setHorizontalBias(view.getId(), 0.56f);没有任何效果（不管我使用哪些数字）。自定义视图始终位于左上角。
在这里你可以看到整个片段的代码（我表示了重要的部分）：
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();
}
为什么在约束布局中设置水平或垂直方向没有任何效果，有什么想法吗？
