Question

我有RecyclerView，我想使用Google Static地图发送URL，并通过Picasso设置此地图。现在，我只尝试在RecyclerView中的每个元素上设置任何静态映射，但是Picasso.with（x）没有上下文。怎么做？

也许可以在FragmentHistory中生成图像并将其作为参数发送吗？

FragmentHistory.xml仅具有RecyclerView;

我的FragmentHistory：

lv.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id)
    {
        Contact current = (Contact)list_ct.get(position);
        Intent in=new Intent(Intent.ACTION_EDIT,Uri.parse("content://contacts/people/"+current.getId()));
        startActivityForResult(in,2);
    }
});

从BD获取数据的功能：

    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;
}

我的fragment_history_simple_item.xml只有2倍的Text View和ImageView

FragmentHistorySimpleAdapter：

 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;
}

FragmentHistorySimpleViewModel：

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;
}
}

FragmentHistorySimpleViewHolder：

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;


}
}

Answer 1

首先，您可以使用Glide库而不是Picasso。由于Glide易于加载任何类型的图像，因此它是位图或url等，并且比毕加索更可缩放。

现在您的问题是如何在此处获得上下文的：在创建FragmentHistorySimpleAdapter对象时，可以专门发送片段上下文，并从FragmentHistorySimpleAdapter构造函数中获取上下文，并在任何地方使用此上下文。

我的FragmentHistory：

    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;
    }
}
}

Answer 2

我怀疑这个问题在某个地方还没有答案，但是我相信您可以始终将imageView.getContext（）用作毕加索的上下文。然后，您将得到类似function foo(...arguments) { return {...arguments} } const argumentsToObject = foo(1, 2, [1, 2, 3], "name", {a: 10,b: 20}) console.log(argumentsToObject)

的信息

此外，您的Picasso库可能是较旧的版本之一？最新版本具有不同的API。像Picasso.with(imageView.getContext()).load(url).into(imageView);

在片段中使用毕加索

2 个答案: