列表适配器中的回调方法不起作用 [英] Callback method in list Adapter doesn't work
问题描述
我使用了在上一个问题中被指导使用的回调方法.它似乎不起作用.不调用onClick()方法.回调方法似乎是一个非常广泛的概念.我不知道如何缩小搜索范围以获取相关信息,或者如何找到我得到的代码有什么问题.
I used a callback methods I was guided to use in a previous question. It doesn't seem to work. The onClick() method is not called. callback methods seem to be a very broad concept. I don't know how to narrow the search in order to get relevant information, or how to find what is wrong with the code I got.
ListActivity -适配器已初始化,并在此处设置了点击侦听器
ListActivity - the Adapter is initialized and a click listener is set here
public class ListActivity extends AppCompatActivity implements ListAdapter.ItemClickListener {
ArrayList<Country> countriesList;
ListAdapter adapter;
RecyclerView rv;
protected void onCreate(@Nullable Bundle savedInstanceState) {
adapter = new ListAdapter(context, this);
adapter.setClickListener(this);
//more irrelevant code
}
}
private Country getCurrentCountry(){
return currentCountry;
}
public void setCurrentCountry(Country currentCountry){
this.currentCountry = currentCountry;
}
@Override
public void onItemClick(View view, int position) {
FragmentTransaction ft;
Bundle countryBundle = new Bundle();
countryBundle.putParcelable("countriesList", getCurrentCountry());
Fragment countryFragment = new CountryFragment();
countryFragment.setArguments(countryBundle);
ft = getSupportFragmentManager().beginTransaction();
ft.add(R.id.fragments_container, countryFragment);
Log.d("Monitoring", getCurrentCountry().toString());
ft.commit();
}
Adapter类中的回调方法
public class ListAdapter extends RecyclerView.Adapter<ListAdapter.RowViewHolder> {
// Adapter class code
...
class RowViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView viewName;
ImageView viewFlag;
LinearLayout countryEntry;
RowViewHolder(View view) {
super(view);
viewName = view.findViewById(R.id.name);
viewFlag = view.findViewById(R.id.flag);
countryEntry = view.findViewById(R.id.rowId);
view.setOnClickListener(this);
}
public void onClick(View view) {
if (mClickListener != null) mClickListener.onItemClick(view, getAdapterPosition());
ListActivity.position = getAdapterPosition();
final Country currentCountry = countriesList.get(getAdapterPosition());
listActivity.setCurrentCountry(currentCountry);
}
}
public void setClickListener(ItemClickListener itemClickListener) {
this.mClickListener = itemClickListener;
}
public interface ItemClickListener {
void onItemClick(View view, int position);
}
//more irrelevant code
}
谢谢!
推荐答案
您无需传递视图和位置,只需传递所需的对象即可.
You don't need to pass view and position, just pass the object you want.
更改界面参数
public interface ItemClickListener {
void onItemClick(Country country);
}
您可以传递所需的对象
public void onClick(View view) {
final Country currentCountry = countriesList.get(getAdapterPosition());
mClickListener.onItemClick(currentCountry);
}
在您的活动中,获取您的国家/地区
In your Activity, get your Country
@Override
public void onItemClick(Country country) {
// get country and do anything you want
}
希望这会有所帮助
这篇关于列表适配器中的回调方法不起作用的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!