在片段中使用毕加索

Question

我有 RecyclerView，我想发送 URL 和 Google 静态地图，并由 Picasso 设置这张地图。现在我只尝试在 RecyclerView 中的每个元素上设置任何静态映射，但 Picasso.with(x) 没有上下文。怎么做？

也许我可以在 FragmentHistory 中生成图像并将其作为参数发送？

FragmentHistory.xml 只有 RecyclerView;

我的片段历史：

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_history, container, false);
    ButterKnife.bind(this, view);



    FragmentHistorySimpleAdapter adapter = new FragmentHistorySimpleAdapter(generateSimpleListAllWorkout());
    RecyclerView recyclerView = (RecyclerView) historyRecyclerView;
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    recyclerView.setAdapter(adapter);

    return view;
}

从BD获取数据的函数：

 private List<FragmentHistorySimpleViewModel> generateSimpleListAllWorkout() {


    List<FragmentHistorySimpleViewModel> simpleViewModelList = new ArrayList<>();


    DataBaseMain bd = new DataBaseMain(getActivity());
    Cursor kurs = bd.giveAllWorkout();

    if (kurs.getCount() != 0) {

        kurs.moveToLast();
        do {

            // Pobranie wartości z kolumn (0-3)

            String nr = kurs.getString(0);
            String time = kurs.getString(1);
            String workoutTime = kurs.getString(2);
            String distance = kurs.getString(3);
            String avgSpeed = kurs.getString(4);
            String avgPace = kurs.getString(5);
            String kcal = kurs.getString(6);
            String LatLng = kurs.getString(7);
            String dane = "ID: " + nr + "\n"
                    + "Time: " + time + "\n"
                    + "Workout time: " + workoutTime + "\n"
                    + "Distance: " + distance + " km" + "\n"
                    + "Average speed: " + avgSpeed + " km/h" + "\n"
                    + "Average pace: " + avgPace + " min/km" + "\n"
                    + "Calories: " + kcal;


            simpleViewModelList.add(new FragmentHistorySimpleViewModel(dane, "OK"));


            // Dopóki kursor może poruszać się w dół (po wynikach)
        } while (kurs.moveToPrevious());
    }

    return simpleViewModelList;
}

我的 fragment_history_simple_item.xml 只有 2x Text View 和 ImageView

FragmentHistorySimpleAdapter:

public class FragmentHistorySimpleAdapter extends RecyclerView.Adapter
{

private List<FragmentHistorySimpleViewModel> models = new ArrayList<>();

public FragmentHistorySimpleAdapter(final List<FragmentHistorySimpleViewModel> viewModels)
{
    if (viewModels != null)
    {
        this.models.addAll(viewModels);
    }
}

@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
{
    final View view = LayoutInflater.from(parent.getContext()).inflate(viewType, parent, false);
    return new FragmentHistorySimpleViewHolder(view);
}

@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position)
{
    ((FragmentHistorySimpleViewHolder) holder).bindData(models.get(position));
}

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

@Override
public int getItemViewType(final int position)
{
    return R.layout.fragment_history_simple_item;
}
}

FragmentHistorySimpleViewModel:

public class FragmentHistorySimpleViewModel
{

private String simpleText;
private String simpleText2;


public FragmentHistorySimpleViewModel(@NonNull final String simpleText, @NonNull final String simpleText2)
{
    setSimpleText(simpleText, simpleText2);

}

@NonNull
public String getSimpleText()
{
    return simpleText;
}

@NonNull
public String getSimpleText2()
{
    return simpleText2;
}

public void setSimpleText(@NonNull final String simpleText, @NonNull final String simpleText2)
{
    this.simpleText = simpleText;
    this.simpleText2 = simpleText2;


}
}

FragmentHistorySimpleViewHolder:

  public class FragmentHistorySimpleViewHolder extends RecyclerView.ViewHolder
     {
    private TextView simpleTextView;
    private TextView simpleTextView2;
    private ImageView imageView;

    public FragmentHistorySimpleViewHolder(final View itemView)
    {
        super(itemView);
        simpleTextView = (TextView) itemView.findViewById(R.id.simple_text);
        simpleTextView2 = (TextView) itemView.findViewById(R.id.simple_text2);
        imageView = itemView.findViewById(R.id.imageView);



    }

       public void bindData(final FragmentHistorySimpleViewModel viewModel)
       {
        simpleTextView.setText(viewModel.getSimpleText());
        simpleTextView2.setText(viewModel.getSimpleText2());

        String latitudeURL = "42";
        String longitudeURL = "122";
        String url ="https://maps.googleapis.com/maps/api/staticmap?";
        url+="&zoom=13";
        url+="&size=600x300";
        url+="&maptype=roadmap";
        url+="&markers=color:green%7Clabel:G%7C" + latitudeURL + "," + longitudeURL;
        url+="&key=" + "AIzaSyCj80x6EGndGx07Hy7zuaLx_KFsHKlogV0";

        Picasso.with(??????)
                .load(url)
                .into(imageView);



    }
    }

Answer 1

我怀疑这个问题不会在某个地方找到答案，但我相信您始终可以使用 imageView.getContext() 作为 Picasso 的上下文。然后你会得到类似 Picasso.with(imageView.getContext()).load(url).into(imageView);

的东西

此外，您的 Picasso 库可能是旧版本之一？最新版本有不同 API。类似于 Picasso.get().load(url).into(imageView);

Answer 2

首先，你可以使用Glide库代替Picasso。因为 Glide 可以很容易地加载任何类型的图像，无论是位图还是 url 等等，并且比 picasso 更具缩放比例。

现在你的问题是如何获得这里的上下文：您可以在创建 FragmentHistorySimpleAdapter 对象时专门发送片段上下文，并从 FragmentHistorySimpleAdapter 构造函数获取上下文并在任何地方使用此上下文。

我的片段历史：

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_history, container, false);
    ButterKnife.bind(this, view);

    Context context = container.context;

    FragmentHistorySimpleAdapter adapter = new FragmentHistorySimpleAdapter(generateSimpleListAllWorkout(), context);

    return view;
}

FragmentHistorySimpleAdapter:

private Context context;
private List<FragmentHistorySimpleViewModel> models = new ArrayList<>();

public FragmentHistorySimpleAdapter(final List<FragmentHistorySimpleViewModel> viewModels, Context context) {

    if (viewModels != null) {
        this.models.addAll(viewModels);
        this.context = context;
    }
}
}

在片段中使用毕加索

Using picasso in fragment

android

picasso