如何从适配器获取项目并将其传递给活动android？

时间：2018-01-12 09:42:04

标签： android android-layout android-recyclerview retrofit android-adapter

我正在使用retrofit我在List类型中请求的地方。 

 public RequestBody(String msisdn, List<RoutePlanDayRequests> routePlanDayRequests ) {
        this.msisdn = msisdn;
        this.routePlanDayRequests = routePlanDayRequests;
    }

所以这个RoutePlanDayRequests有以下pojo类。 

public class RoutePlanDayRequests {

    private String status;

    private String oldDay;

    private String neweDay;


    public String getOldDay() {
        return oldDay;
    }

    public void setOldDay(String oldDay) {
        this.oldDay = oldDay;
    }

    public String getNeweDay() {
        return neweDay;
    }

    public void setNeweDay(String neweDay) {
        this.neweDay = neweDay;
    }
}

所以我调用一个Web服务来显示adapter中的列表。现在我在适配器类中获得响应，并在MainActivity中获得 提交按钮。 所以当我改变时其他日子的微调器并提交，如何从适配器获取此项并在MainActivity中传递数据？

因为在适配器类中，它具有微调器，其中项目根据微调器选择而变化。所以我需要提交更改的项目。但问题是提交按钮在MainActivity中。那么如何在MainActivity中传递这些项值？

MainActivity.class：

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 setcontentView(R.layout.main);

initialLoadingServiceList(); //this is to load initial items

 submitChangeRequest.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //here I have been strucked.
                updateServiceList();
            }
        });

 private void updateServiceList() {
        List<RoutePlanDayRequests> request = null;
        //strucked to get the spinner values to pass in request.
        RetrofitInstance.getInstance(this)
                .create(RoutePlanService.class)
                .getSaveRoutePlanDay(new SaveDayRequest(new RequestBody("",request)) //here I need to pass the changed item values from adapter to here. 
    }
}

//Hope you got it my requirement. 

public void initialLoadingServiceList(){
//skipping service list.. 

    RoutePlanVisitChangeAdapter adapter = new RoutePlanVisitChangeAdapter(retailers, RoutePlanVisitChangeActivity.this);
                                        mRecyclerView.setAdapter(adapter);

}


}

适配器类：

public class RoutePlanVisitChangeAdapter extends RecyclerView.Adapter<RoutePlanVisitChangeAdapter.RoutePlanVisitChangeView> {
    private List<Retailers> mList;
    private Context context;
    private String[] daysList = {"MON", "TUE", "WED", "THU", "FRI", "SAT"};

    public RoutePlanVisitChangeAdapter(List<Retailers> list, Context context) {
        this.mList = list;
        this.context = context;
    }


    @Override
    public RoutePlanVisitChangeView onCreateViewHolder(ViewGroup parent, int viewType) {
        View view;
        view = LayoutInflater.from(parent.getContext()).inflate(R.layout.route_plan_visit_change_row, parent, false);
        return new RoutePlanVisitChangeView(view);
    }

    @Override
    public void onBindViewHolder(RoutePlanVisitChangeView holder, int position) {
        Retailers routePlanVisitChange = mList.get(position);
        holder.retailerName.setText(routePlanVisitChange.getName());
        holder.retailerNumber.setText(routePlanVisitChange.getMsisdn());
        holder.fromDay.setText(routePlanVisitChange.getRoutePlanDayOfWeek());
        String profileUrl = routePlanVisitChange.getProfileImage().getImageUrl();
        Glide.with(context)
                .load(profileUrl)
                .placeholder(R.drawable.ic_default_profile)
                .error(R.drawable.ic_default_profile)
                .into((holder.profileImage));

        String getRoutePlanDay = routePlanVisitChange.getRoutePlanDayOfWeek().toUpperCase();
        List<String> asSet = new ArrayList<String>(Arrays.asList(daysList));
        asSet.remove(getRoutePlanDay);
        String[] newDayList = asSet.toArray(new String[]{});
        ArrayAdapter updatedData = new ArrayAdapter(context, android.R.layout.simple_spinner_item, newDayList);
        updatedData.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        holder.toDay.setAdapter(updatedData); //so now i changed the values in spinner. I need to update in button click in main activity
        String selectedSpinner = holder.toDay.getSelectedItem().toString();
    }

    @Override
    public int getItemCount() {
        if (mList == null)
            return 0;
        return mList.size();
    }

    public class RoutePlanVisitChangeView extends RecyclerView.ViewHolder {

        public TextView retailerName;
        public TextView retailerNumber;
        public AppCompatButton fromDay;
        public Spinner toDay;
        public CircleImageView profileImage;

        public RoutePlanVisitChangeView(View view) {
            super(view);
            retailerName = (TextView) 
            view.findViewById(R.id.recycle_txt_acc_name);
            retailerNumber = (TextView) 
            view.findViewById(R.id.recycle_txt_acc_num);
            fromDay = (AppCompatButton) view.findViewById(R.id.from_day);
            toDay = (Spinner) view.findViewById(R.id.to_day);
            profileImage = (CircleImageView) view.findViewById(R.id.recycle_profile);
            //toDay = (AppCompatButton) view.findViewById(R.id.to_day);
        }
    }
    public Retailers getItem(int position) {
        return mList.get(position);
        }
     }
   }

请建议/解决我的问题。很难理解如何从适配器类中获取MainActivity中的项目。

3 个答案:

答案 0 :(得分：1)

尝试此方法

  
      
  1. 定义一个接口RecyclerViewClickListener，用于将消息从适配器传递到Activity/Fragment：
    2.    
public interface RecyclerViewClickListener
{

     public void recyclerViewListClicked(View v, int position);
     onSpinnerSelected(int position, Object selection);
}
  
      
  1. 在Activity/Fragment中实现interface，并将侦听器传递给适配器：
    2.    
@Override
public void recyclerViewListClicked(View v, int position){... ...}

//set up adapter and pass clicked listener this
myAdapter = new MyRecyclerViewAdapter(context, this);
  
      
  1. 在Adapter和ViewHolder中：
    2.    
public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.ItemViewHolder> {

   ... ... 
   private Context context;
   private static RecyclerViewClickListener itemListener;


   public MyRecyclerViewAdapter(Context context, RecyclerViewClickListener itemListener) {

        this.context = context;
        this.itemListener = itemListener;
        ... ...
   }


   //ViewHolder class implement OnClickListener, 
   //set clicklistener to itemView and, 
   //send message back to Activity/Fragment 
   public static class ItemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

        ... ...

        public ItemViewHolder(View convertView)
        {
            super(convertView);
            ... ...

            convertView.setOnClickListener(this);
      //setting the listener in your spinner
       yourSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> spinner, View container,
                int position, long id) {
            //here you have the position and spinner value selected just pass this to callback method.
            itemListener .onSpinnerSelected(getAdapterPosition(),spinner.getSelectedItem())
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub
        }
    });
        }


       @Override
       public void onClick(View v)
       {
          itemListener.recyclerViewListClicked(v, this.getPosition());      

       }

   }

}

答案 1 :(得分：0)

1：制作回调侦听器，并将其传递给 recyclerview 适配器类

public interface Callback{
    onSpinnerSelected(int position, Object selection);
}

2：现在将此传递给您的适配器，并提供您正在使用它的活动或片段的参考。

public class RoutePlanVisitChangeAdapter extends RecyclerView.Adapter<RoutePlanVisitChangeAdapter.RoutePlanVisitChangeView> {
        private List<Retailers> mList;
        private Context context;
        private String[] daysList = {"MON", "TUE", "WED", "THU", "FRI", "SAT"};
        private Callback callback;
        public RoutePlanVisitChangeAdapter(List<Retailers> list, Context context, Callback callback) {
            this.mList = list;
            this.context = context;
            this.callback = callback;
        }
    //......
    }

3：，现在当你的微调器被选中时，只需要调用它。

 public RoutePlanVisitChangeView(View view) {
        super(view);
        retailerName = (TextView) view.findViewById(R.id.recycle_txt_acc_name);
        retailerNumber = (TextView) view.findViewById(R.id.recycle_txt_acc_num);
        fromDay = (AppCompatButton) view.findViewById(R.id.from_day);
        toDay = (Spinner) view.findViewById(R.id.to_day);
        profileImage = (CircleImageView) view.findViewById(R.id.recycle_profile);
        //toDay = (AppCompatButton) view.findViewById(R.id.to_day);

       //setting the listener in toDay spinner
       toDay.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> spinner, View container,
                int position, long id) {
            //here you have the position and spinner value selected just pass this to callback method.
            callback.onSpinnerSelected(getAdapterPosition(),spinner.getSelectedItem())
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub
        }
    });
    }

4：现在在您提供引用或初始化构造函数的活动片段中，您必须重写回调方法。

public void initialLoadingServiceList(){
 //skipping service list.. 
 RoutePlanVisitChangeAdapter adapter = new 
 RoutePlanVisitChangeAdapter(retailers, 
 RoutePlanVisitChangeActivity.this, new Callback(){
    @Override
    public void onSpinnerSelected(int position, Object selection){
        //here you use your selected value and cast it to particular object before use.
    }
});
 mRecyclerView.setAdapter(adapter);

}

答案 2 :(得分：-1)

在此处输入代码

Intent intent = new Intent(context, SelectAddressActivity.class);

intent.putExtra("id", objects.getyourvariable());

context.startActivity(intent);
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