如何在livedata观察者中向cardview添加视图

Question

I am trying to add some radio button into a card view. Here's my code:

MainActivity.java

cardView = findViewById(R.id.card_view);
mGameViewModel.setUpGame().observe(this,this::loadRound);

private void loadRound(List<Smiley> smileys) {
    if (smileys == null) {
        return;
    }
    mAnswersView.loadAnswers(smileys, cardView);
    mGameViewModel.startNewGameRound();
}

AnswerView

public void loadAnswers(List<Smiley> smileys, CardView cardView) {
    if (smileys == null) {
        return;
    }
    removeAllViews();
    LayoutInflater inflater = LayoutInflater.from(getContext());

    for (Smiley smiley : smileys) {
        RadioButton button = (RadioButton) inflater.inflate(R.layout.answer_item, this, false);
        button.setText(smiley.getName());
        button.setTag(R.string.answer_tag, smiley.getCode());
        cardView.addView(button);
    }
}

But that doesn't seem to work. Any idea please?

EDIT: The problem here is that the radio button i try to create doesn't show. I've already do some debugging and all of the methods are called until the addView method. But when i take a look on the device, there's no 'extended' view, in this case, radio button at all.

Answer 1

So, i fixed the problem by using LinearLayout inside the CardView. Then I parse the LinearLayout to the loadAnswer() function, and here's the rest:

RadioButton button = (RadioButton) inflater.inflate(R.layout.answer_item, linearLayout, false);
button.setText(smiley.getName());
button.setTag(R.string.answer_tag, smiley.getCode());
linearLayout.addView(button);

From this case, I learnt that we can't directly addView to the CardView. You can do it by creating a LinearLayout inside the CardView to add custom widget programmatically inside the CardView.