RecyclerView的onClick在单击项目时不起作用，只有当您单击"在项目之间"时

Question

我正在学习Android，并且正在使用RecyclerView进行测试。我想添加一个 OnItemClickListener，我想看看是否有效，所以我每次单击项目时都会出现一个 Toast，但奇怪的事情发生了，只有当我单击 Recycler 的卡片之间时才会触发，而不是当我单击项目时。我一直在寻找有同样问题的人，但没有找到任何东西。

这是回收器适配器及其活动。

适配器

public class CardAdapter extends ListAdapter<Card, CardAdapter.CardHolder> {
private OnItemClickListener listener;
private Context mContext;
private Intent myIntent;
protected CardAdapter() {
super(DIFF_CALLBACK);
}
private static final DiffUtil.ItemCallback<Card> DIFF_CALLBACK = new DiffUtil.ItemCallback<Card>() {
@Override
public boolean areItemsTheSame(Card oldItem, Card newItem) {
return oldItem.getId() == newItem.getId();
}
@Override
public boolean areContentsTheSame(Card oldItem, Card newItem) {
return oldItem.getCardImage() == newItem.getCardImage() &&
oldItem.getCardName().equals(newItem.getCardName()) &&
oldItem.getCardCode().equals(newItem.getCardCode()) &&
oldItem.getCardSet().equals(newItem.getCardSet()) &&
oldItem.getQuantity() == newItem.getQuantity() &&
oldItem.getRarity().equals(newItem.getRarity());
}
};
@NonNull
@Override
public CardHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_item, parent, false);
mContext = parent.getContext();
return new CardHolder(itemView);
}
@Override
public void onBindViewHolder(@NonNull CardHolder holder, int position) {
Card currentCard = getItem(position);
Picasso.with(mContext).load(currentCard.getCardImage()).fit().centerInside().into(holder.cardImage);
holder.cardName.setText(currentCard.getCardName());
holder.cardCode.setText(currentCard.getCardCode());
holder.cardSet.setText(currentCard.getCardSet());
holder.rarity.setText(currentCard.getRarity());

}

class CardHolder extends RecyclerView.ViewHolder {
private ImageView cardImage;
private TextView cardName;
private TextView cardCode;
private TextView cardSet;
private TextView quantity;
private TextView rarity;
public CardHolder(View itemView) {
super(itemView);
cardImage = itemView.findViewById(R.id.cardImage);
cardName = itemView.findViewById(R.id.cardName);
cardCode = itemView.findViewById(R.id.cardCode);
cardSet = itemView.findViewById(R.id.cardSet);
rarity = itemView.findViewById(R.id.cardRarity);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(mContext, "epaepa", Toast.LENGTH_SHORT).show();
Log.d("LogDiaViewHolder","epaepa");
}
});
}
public ImageView getCardImage() {
return cardImage;
}
}
public interface OnItemClickListener {
void onItemClick(Card card);
}
public void setOnItemClickListener(OnItemClickListener listener) {
this.listener = listener;
}
}

活动

public class CardListActivity extends AppCompatActivity {
private CardViewModel cardViewModel;
private View decorView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_card_list);
RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
final CardAdapter adapter = new CardAdapter();
recyclerView.setAdapter(adapter);
cardViewModel = ViewModelProviders.of(this).get(CardViewModel.class);
cardViewModel.getAllCards().observe(this, new Observer<List<Card>>() {
@Override
public void onChanged(List<Card> cards) {
adapter.submitList(cards);
}
});
decorView = getWindow().getDecorView();
decorView.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
if (visibility == 0) {
decorView.setSystemUiVisibility(hideSystemBars());
}
}
});
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (hasFocus) {
decorView.setSystemUiVisibility(hideSystemBars());
}
}
}

如果有人想要完整的项目，我会在这里留下回购：https://github.com/nochuckles/BattleSpiritsCBDB

任何帮助都会很好，谢谢！

Answer 1

我修好了！显然，如果您有以下属性：

clickable:true

在你的CardView，这将发生。

我不知道为什么，我正在测试不同的东西，当我删除它时，它开始完美运行。我不知道为什么会发生这种情况，我会做一些研究，但如果有人对此有一些信息，我将不胜感激，谢谢！

Answer 2

在BindViewHolder中设置 OnClickListeners

@Override
public void onBindViewHolder(@NonNull CardHolder holder, int position) {
Card currentCard = getItem(position);
Picasso.with(mContext).load(currentCard.getCardImage()).fit().centerInside().into(holder.cardImage);
holder.cardName.setText(currentCard.getCardName());
holder.cardCode.setText(currentCard.getCardCode());
holder.cardSet.setText(currentCard.getCardSet());
holder.rarity.setText(currentCard.getRarity());
//example
holder.cardName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(mContext, "epaepa", Toast.LENGTH_SHORT).show();
Log.d("LogDiaViewHolder","epaepa");
}
});
}

Answer 3

显示Toast 不是您的适配器，您必须使用接口 OnItemClickListener 在点击项目时通知您的活动。为此，您的活动必须实现此接口和 onItemClick 方法：

public class CardListActivity extends AppCompatActivity implements OnItemClickListener {
....
void onItemClick(Card card) {
Toast.makeText(mContext, "epaepa", Toast.LENGTH_SHORT).show();
Log.d("LogDiaViewHolder","epaepa");
}
}

要在适配器中启动 onItemClick 事件，您必须将接口的实例传递给适配器

public class CardAdapter extends ListAdapter<Card, CardAdapter.CardHolder> {
//....
private OnItemClickListener mListener
protected CardAdapter(OnItemClickListener listener) {
super(DIFF_CALLBACK);
this.mListener = listener;
}
}

然后在项目单击时调用接口方法

itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mListener.onItemClick(v)
}
});