Question

我有一个cardview的回收视图，每个cardview都有一个竖起大拇指（如）按钮。

我希望当用户点击特定卡片上的拇指按钮时，他们“喜欢”该帖子，按钮动画并处理相应的逻辑。

到目前为止，这是我的代码：

          1    2    3    4    5    6
      1  2639 156  69   49   21   42
      2  150  300  53   11   1    1
      3  74   20   363  48   8    4
      4  60   7    46   384  65   12
      5  42   2    5    75   275  63
      6  40   0    1    15   52   402

library(markovchain)
mcobject<-as(mytableX, "markovchain")


         1           2           3          4           5           6
1 0.88676075 0.052419355 0.023185484 0.01646505 0.007056452 0.014112903
2 0.29069767 0.581395349 0.102713178 0.02131783 0.001937984 0.001937984
3 0.14313346 0.038684720 0.702127660 0.09284333 0.015473888 0.007736944
4 0.10452962 0.012195122 0.080139373 0.66898955 0.113240418 0.020905923
5 0.09090909 0.004329004 0.010822511 0.16233766 0.595238095 0.136363636
6 0.07843137 0.000000000 0.001960784 0.02941176 0.101960784 0.788235294

当用户点击like按钮时，它会在toast中显示正确的适配器位置，但它没有像它应该的那样动画，我无法在其上设置动画。通常情况下，按钮在单击时会动画，但是当它在Recyclerview中时，它似乎不起作用。

我试着做

 private class CardViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    private CardView mCardView;
    private TextView cardTitle, cardUsername;
    private ImageView cardImage;
    public CardViewHolder(View itemView){
        super(itemView);
        mCardView = (CardView) itemView.findViewById(R.id.cardview);
        cardTitle = (TextView) itemView.findViewById(R.id.cardTitle);
        cardUsername = (TextView) itemView.findViewById(R.id.cardUsername);
        cardImage = (ImageView) itemView.findViewById(R.id.cardImage);
        mLikeButton = (LikeButton) itemView.findViewById(R.id.thumb);

        itemView.setOnClickListener(this);
        mLikeButton.setOnClickListener(this);

    }
    @Override
    public void onClick(View v) {

        if (v.getId() == mLikeButton.getId()){
            Toast.makeText(v.getContext(), "ITEM PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(v.getContext(), "ROW PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
            Toast.makeText(v.getContext(), mRecipes[getAdapterPosition()].getRecipename().toString(), Toast.LENGTH_SHORT).show();
        }
    }
}

但演员似乎不起作用。我希望能够直接引用recyclerview特定行中的特定like按钮，以便我可以在其上调用方法。这可能吗？

这是在按钮上设置点击监听器的不好方法吗？

Answer 1

问题在于视图ID检查。如果您想使用您的解决方案，那将是这样的：

private static class CardViewHolder extends RecyclerView.ViewHolder
    implements View.OnClickListener {

private CardView mCardView;
private TextView cardTitle, cardUsername;
private ImageView cardImage;

public CardViewHolder(View itemView) {
    super(itemView);

    mCardView = (CardView) itemView.findViewById(R.id.cardview);
    cardTitle = (TextView) itemView.findViewById(R.id.cardTitle);
    cardUsername = (TextView) itemView.findViewById(R.id.cardUsername);
    cardImage = (ImageView) itemView.findViewById(R.id.cardImage);
    mLikeButton = (LikeButton) itemView.findViewById(R.id.thumb);

    itemView.setOnClickListener(this);
    mLikeButton.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    if (v instanceof LikeButton) {
        // You now this is the LikeButton
        Toast.makeText(v.getContext(), "ITEM PRESSED = " +
                String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
        ((LikeButton) v).setLiked(true);
    } else {
        // Not a LikeButton
        Toast.makeText(v.getContext(), "ROW PRESSED = " +
                String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
        Toast.makeText(v.getContext(),
                mRecipes[getAdapterPosition()].getRecipename().toString(),
                Toast.LENGTH_SHORT).show();
    }
}
}

我们在这里做的是检查View是否为LikeButton。如果是这样，我们可以安全地投射它并在其上调用我们的方法。如果不是itemView。在我看来，更好的方法是匿名实施OnClickListener。这看起来像这样：

private static class CardViewHolder extends RecyclerView.ViewHolder
    implements View.OnClickListener {

private CardView mCardView;
private TextView cardTitle, cardUsername;
private ImageView cardImage;

public CardViewHolder(View itemView) {
    super(itemView);

    mCardView = (CardView) itemView.findViewById(R.id.cardview);
    cardTitle = (TextView) itemView.findViewById(R.id.cardTitle);
    cardUsername = (TextView) itemView.findViewById(R.id.cardUsername);
    cardImage = (ImageView) itemView.findViewById(R.id.cardImage);
    mLikeButton = (LikeButton) itemView.findViewById(R.id.thumb);

    itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // You now for sure this is an ItemView.
            Toast.makeText(v.getContext(), "ROW PRESSED = " +
                    String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT)
                    .show();
            Toast.makeText(v.getContext(),
                    mRecipes[getAdapterPosition()].getRecipename().toString(),
                    Toast.LENGTH_SHORT).show();
        }
    });

    mLikeButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // You now for sure this is a LikeButton.
            Toast.makeText(v.getContext(), "ITEM PRESSED = " +
                    String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT)
                    .show();
            ((LikeButton) v).setLiked(true);
        }
    });
}
}

我们想要处理的每个OnClickListener都有一个View。因为每个View都有自己的View，所以我们始终知道哪个HostingEnvironment.QueueBackgroundWorkItem已被点击，并且可以采取相应的行动。

处理OnClickRequestView元素中的项目？

1 个答案: