向 RecyclerView 传递多个参数

Question

在我当前的代码中，我能够将一个值传递并显示给 RecyclerView。我不确定我错过了什么，或者我是否必须完全更改我的代码。

这是我的适配器类：

public class TechSkillsAdapter extends RecyclerView.Adapter<TrainingViewHolder> {

    Context c;
    ArrayList<String> trainings;

    public TechSkillsAdapter(Context c, ArrayList<String> trainings) {
        this.c = c;
        this.trainings = trainings;
    }

    @Override
    public TrainingViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(c).inflate(R.layout.cv_traininglist, parent, false);
        return new TrainingViewHolder(v);
    }

    @Override
    public void onBindViewHolder(TrainingViewHolder holder, int position) {
        holder.date_txt.setText(trainings.get(position));
    }

    @Override
    public int getItemCount() {
        return trainings.size();
    }

}

我正在使用改造检索列表，然后将值传递给将它们显示到回收视图的方法。

这是我检索培训的方式：

private void getTraining(final String id, String tid){
        com.trendmicro.projectlara.apis.ApiServiceTraining apiService = ApiClient.getClient().create(ApiServiceTraining.class);
        Call<List<Training>> call = apiService.getMyTraining(id, tid);
        call.enqueue(new Callback<List<Training>>() {
            @Override
            public void onResponse (Call<List<Training>> call, Response<List<Training>> response) {    
                List<Training> training = response.body();
                for(Training t: training){
                    fillTrainings(t.getTraining_title().toString(), t.getTraining_date().toString());
                }
            }

这是我的 fillTrainings 方法。

我传递了两个值，但我只能显示一个值：

private void fillTrainings(String title, String date) {
  training.add(title);

  adapter = new TechSkillsAdapter(getContext(), training);
  rv.setAdapter(adapter);
  progressDialog.dismiss();
}

这是我要解决的问题，我不确定如何显示日期，因为我添加值的方式是：training.add(title);

非常感谢任何帮助或提示。谢谢！

Answer 1

这是因为每次您有一个带有此代码的项目时，您都会重新创建适配器：

@Override
public void onResponse (Call<List<Training>> call, Response<List<Training>> response) {    
    List<Training> training = response.body();
    for(Training t: training){
        // here you're only send one time
        fillTrainings(t.getTraining_title().toString(), t.getTraining_date().toString());
    }
}

您可以通过将方法更改为此将所有列表发送到您的方法来修复它：

private void fillTrainings(List<Training> trainList) {
  for(Training train: trainList) {
    training.add(train.getTraining_title().toString());
  }

  adapter = new TechSkillsAdapter(getContext(), training);
  rv.setAdapter(adapter);
  progressDialog.dismiss();
}

然后你可以使用它：

@Override
public void onResponse (Call<List<Training>> call, Response<List<Training>> response) {    
  List<Training> training = response.body();
  fillTrainings(training);
}

Answer 2

您收到了Training 的List，但由于某种原因，您的适配器受到List 的String 的支持。这是为什么呢？

修改您的适配器以保存培训，然后将标题和日期绑定到视图。

public class TechSkillsAdapter extends RecyclerView.Adapter<TrainingViewHolder> {

    Context c;
    ArrayList<Training> trainings;

    public TechSkillsAdapter(Context c, ArrayList<Training> trainings) {
        this.c = c;
        this.trainings = trainings;
    }

    @Override
    public TrainingViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(c).inflate(R.layout.cv_traininglist, parent, false);
        return new TrainingViewHolder(v);
    }

    @Override
    public void onBindViewHolder(TrainingViewHolder holder, int position) {
        holder.title_txt.setText(trainings.get(position).getTraining_title().toString());
        holder.date_txt.setText(trainings.get(position).getTraining_date().toString());
    }

    @Override
    public int getItemCount() {
        return trainings.size();
    }

}

然后在你的 onResponse 中做：

    @Override
    public void onResponse (Call<List<Training>> call, Response<List<Training>> response) {    
        List<Training> training = response.body();
        adapter = new TechSkillsAdapter(getContext(), training);
        rv.setAdapter(adapter);
        progressDialog.dismiss();
    }

这应该可以，但是如果您创建并设置一次适配器（在 onCreate 中）并将其传递一些列表，然后在 onResponse 中更新该列表并执行 adapter.notifyDataSetChanged() 类似这样的操作，则可以改进这一点：

//Activity
   List<Training> mTrainingsList = new ArrayList<Training>();

//onCreate
adapter = new TechSkillsAdapter(getContext(), mTrainingsList);
...
}



@Override
public void onResponse (Call<List<Training>> call, Response<List<Training>> response) {    
    List<Training> training = response.body();
    mTrainingList.clear();
    mTrainingList.addAll(training);
    adapter.notifyDatasetChanged();
    progressDialog.dismiss();
}

编辑：另外，请注意，在您的代码中，您将查看培训列表并为每个项目重新创建适配器！以后尽量避免这种情况。