java - 将列表信息传递给新 Activity

Question

我正在制作一个教程，其中我创建了一个 RecyclerView 屏幕，其中包含带有 optional 的卡片。我希望其中一个 optional 能够将用户带到一个新的 activity，其中包含有关他们选择的卡的更多信息和选项。我的问题是，当我尝试将该特定卡片的特征传输到下一个 SlideViewActivity.java activity 时，我无法成功执行此操作。我尝试将列表转换为数组，然后发送该列表，但我不断获得null值(这可能是由于我所知道的语法所致)。

任何澄清和指导将不胜感激，如果您还需要任何其他代码，请告诉我。

public class Adapter extends RecyclerView.Adapter<Adapter.MyViewHolder> {
private Context mContext;
private List<Properties> dogList;

public class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView title, count;
    public ImageView thumbnail, overflow;

    public MyViewHolder(View view) {
        super(view);
        title = (TextView) view.findViewById(R.id.title);
        count = (TextView) view.findViewById(R.id.count);
        thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
        overflow = (ImageView) view.findViewById(R.id.overflow);
    }
}

public Adapter(Context mContext, List<Properties> dogList) {
    this.mContext = mContext;
    this.dogList = dogList;
}

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

@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
    Properties dog = dogList.get(position);
    holder.title.setText(dog.getName());
    // loading dog cover using Glide library
    Glide.with(mContext).load(dog.getThumbnail()).into(holder.thumbnail);
    holder.overflow.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showPopupMenu(holder.overflow);
        }
    });
}

/**
 * Showing popup menu when tapping on icon
 */
private void showPopupMenu(View view) {
    // inflate menu
    PopupMenu popup = new PopupMenu(mContext, view);
    MenuInflater inflater = popup.getMenuInflater();
    inflater.inflate(R.menu.menu, popup.getMenu());
    popup.setOnMenuItemClickListener(new MyMenuItemClickListener());
    popup.show();
}

/**
 * Click listener for popup menu items
 */
class MyMenuItemClickListener implements PopupMenu.OnMenuItemClickListener {

    public MyMenuItemClickListener() {
    }

    @Override
    public boolean onMenuItemClick(MenuItem menuItem) {
        switch (menuItem.getItemId()) {
            case R.id.action_add_favourite:
                Toast.makeText(mContext, "Add to favourite", Toast.LENGTH_SHORT).show();
                return true;
            case R.id.action_more_info:
                Intent slideStart = new Intent(mContext, SlideViewActivity.class);
                String[] dogArray = new String[dogList.size()];
                slideStart.putExtra("List", dogArray);
                Log.e("putting extra", String.valueOf(dogArray[0]));
                //TODO:MAKE NAME TRANSFERS WORK
                mContext.startActivity(slideStart);
                return true;
            default:
        }
        return false;
    }
}

添加Properties.java:

public class Properties {
private String name;
private String info;
private int thumbnail;

public Properties() {
}

public Properties(String name, String info, int thumbnail) {
    this.name = name;
    this.info = info;
    this.thumbnail = thumbnail;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getInfo() {
    return info;
}

public void getInfo(String info) {
    this.info = info;
}

public int getThumbnail() {
    return thumbnail;
}

public void setThumbnail(int thumbnail) {
    this.thumbnail = thumbnail;
}
}

Answer 1

您可以通过ArrayList<T> ，如果T是 Serializable .

例如:

ArrayList<String> list = new ArrayList<String>();
intent.putExtra("list", list);

使用getSerializableExtra提取数据