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[英]How to pass data from a activity to a recycler view adapter in android
[英]How to pass a Recycler view adapter in a constructor?
假设我有三个这样的适配器,每个适配器都定义了一个接口,即 ClickListener,它有一个 onItemClick 方法。
public class SearchResultAdapter extends RecyclerView.Adapter<SearchResultAdapter.searchResultViewHolder>
{
....
public interface ClickListener {
void onItemClick(int paramInt, View paramView);
}
}
如何将适配器传递给构造函数,以便我可以访问类中的 ClickListener() 方法适配器。
例子
public class ABC{
private RecyclerView.Adapter adapter;
public ABC(RecyclerView.Adapter adapter){
this.adapter = adapter;
}
private void xyz(){
//How to achieve this
recyclerView.setOnClickListener(new adapter.ClickListener(){
@Override
public void onItemClick(int position, View v) {
}
});
}
好吧,在您的 Activity/Fragment 中,您有 RecyclerView 实例,在那里,您应该能够将 Recycler 传递给ABC
,以便它可以附加 onClick。
但是,我建议更好的设计是:您的活动/片段将您的适配器 OnClickListener 实现为:接收点击并将其传递给 ABC,然后 ABC 处理它。
喜欢:
public class SearchResultAdapter extends RecyclerView.Adapter<SearchResultAdapter.searchResultViewHolder>
{
public void setListener(ClickListener listener){
this.listener = listener;
}
public interface ClickListener {
void onItemClick(int paramInt, View paramView);
}
}
public class ABC {
public void adapterClicked(){
// do something here on adapter item clicked.
}
}
public class Activity extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout....);
SearchResultAdapter adapter = new ........();
ABC abc = new ABC();
adapter.setOnClickListener(() -> {
abc.adapterClicked();
}); // java 8
}
}
我试过下面的方法创建一个接口 RecyclerOnItemClickListener
import android.view.View;
public interface RecyclerOnItemClickListener {
public void onItemClick(View childView, int position);
}
在适配器类中,您可以获取在调用 Activity/Fragment 中实现的 RecyclerOnItemClickListener 对象
RecyclerOnItemClickListener mItemClickListener;
然后您可以在适配器的构造函数中初始化该变量
mItemClickListener = recyclerOnItemClickListener;
活动/片段实现了 RecyclerOnItemClickListener 接口,因此它将实现 onItemClick 方法。 您可以在此处编写用于在下一个活动中传递数据的代码
@Override
public void onItemClick(View childView, int position)
{
Intent intent = new Intent(getActivity(), NextActivity.class);
intent.putExtra("ITEM", mModels.get(position));
startActivity(intent);
}
在适配器类中,您需要初始化 ViewHolder 类,如下所示:
class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{
TextView content;
TextView proba;
ImageView imageView;
public ViewHolder(View itemView) {
super(itemView);
content = (TextView) itemView.findViewById(R.id.textView);
proba = (TextView) itemView.findViewById(R.id.textView2);
imageView = (ImageView) itemView.findViewById(R.id.imageView);
}
@Override
public void onClick(View v)
{
if (mItemClickListener != null)
{
mItemClickListener.onItemClick(v, getPosition());
}
}
}
从您的程序中,我了解到您希望在 RecyclerView 上使用ClickListener
。 这是我的适配器。
我在视图持有者类中创建的 ClickListener。 只需使用implements View.OnClickListener
实现您的类。并通过getAdapterPosition()
获取用户点击
class buses_list_adaptor extends RecyclerView.Adapter<buses_list_adaptor.viewholder> {
List <Detail_buses> list;
public buses_list_adaptor(List <Detail_buses> list) {
this.list = list;
}
@Override
public buses_list_adaptor.viewholder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.list_buses, parent, false);
return new viewholder(view, list);
}
@Override
public void onBindViewHolder(buses_list_adaptor.viewholder holder, int position) {
holder.bus_no.setText(list.get(position).getBus_no());
holder.start_bustop.setText(list.get(position).getFrom());
holder.stop_bustop.setText(list.get(position).getTo());
}
@Override
public int getItemCount() {
return list.size();
}
class viewholder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView bus_no, start_bustop, stop_bustop;
List <Detail_buses> list;
public viewholder(View itemView, List <Detail_buses> list) {
super(itemView);
this.list = list;
bus_no = itemView.findViewById(R.id.buses_bus_no);
start_bustop = itemView.findViewById(R.id.buses_from_stop);
stop_bustop = itemView.findViewById(R.id.buses_to_stop);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View view) {
Fragment fragment= new Bus_list_stp();
Bundle bundle= new Bundle();
bundle.putInt("position",getAdapterPosition());
dashboardActivity.dashboardActivityOBJ.changeFragment(fragment,bundle);
}
}
}
我希望这对你有用
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