Question

我创建了recyclerView（参见此图片）

但我没有得到我想要的结果。我需要得到这个：

你看我已经把这个职业分组了，所有职业都有它自己的偶像。所以我现在将包含我的recyclerView代码。我怎么能在图像中做到？如果我做错了什么，请告诉我，不要放弃投票。

这是项目类。

public class Rec_Items {

    private int image;
    private String fullName;
    private String profession;

    public Rec_Items(int image, String fullName, String profession) {
        this.image = image;
        this.fullName = fullName;
        this.profession = profession;
    }

    public int getImage() {
        return image;
    }

    public String getFullName() {
        return fullName;
    }

    public String getProfession() {
        return profession;
    }
}

现在这里adapter的{{1}}。

ViewHolder

我已经完成了public class SupportersAdapter extends RecyclerView.Adapter<SupportersAdapter.MyViewHolder> { Context context; List<Supporters_item> list = new ArrayList<>(); public SupportersAdapter(Context context, List<Supporters_item> list) { this.context = context; this.list = list; } @Override public SupportersAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v; v = LayoutInflater.from(context).inflate(R.layout.supporters_view_item, parent, false); MyViewHolder holder = new MyViewHolder(v); return holder; } @Override public void onBindViewHolder(SupportersAdapter.MyViewHolder holder, int position) { holder.imageView.setImageResource(list.get(position).getImage()); holder.fullName.setText(list.get(position).getFullName()); holder.profession.setText(list.get(position).getProfession()); if (list.get(position).getProfession().equals("Actress")) { holder.icon.setImageResource(R.drawable.medical); } if (list.get(position).getProfession().equals("Builder")) { holder.icon.setImageResource(R.drawable.builderkey); } if (list.get(position).getProfession().equals("Designer")) { holder.icon.setImageResource(R.drawable.shopping); } if (list.get(position).getProfession().equals("Programmer")) { holder.icon.setImageResource(R.drawable.education); } if (position > 0) { if (!list.get(position).getProfession().substring(0,1).equals(list.get(position-1).getProfession().substring(0, 1))) { holder.view.setVisibility(View.VISIBLE); holder.icon.setVisibility(View.VISIBLE); } } } @Override public int getItemCount() { return list.size(); } public class MyViewHolder extends RecyclerView.ViewHolder { ImageView imageView, icon; TextView fullName, profession; View view; public MyViewHolder(View itemView) { super(itemView); imageView = (ImageView) itemView.findViewById(R.id.support_picture); fullName = (TextView) itemView.findViewById(R.id.fName); profession = (TextView) itemView.findViewById(R.id.profession); icon = (ImageView) itemView.findViewById(R.id.icon); view = itemView.findViewById(R.id.bottomLine); } } }中的小组部分，所以在那里观看，我没有得到我想要的结果，我想得到图像结果。

这是onBindViewHolder()类。

MainActivity

如何修改我的代码，为了获得分组public class MainActivity extends AppCompatActivity { private List<Rec_Items> list; private RecyclerView recyclerView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); recyclerView = (RecyclerView) findViewById(R.id.supporters_recycler); add(); Adapter adapter = new Adapter(this, list); recyclerView.setLayoutManager(new LinearLayoutManager(this)); recyclerView.setAdapter(adapter); } public void add(){ list = new ArrayList<>(); list.add(new Rec_Items(R.drawable.pfl_img, "Name Surname", "Actress")); list.add(new Rec_Items(R.drawable.pfl_img, "Name Surname", "Programmer")); list.add(new Rec_Items(R.drawable.pfl_img, "Name Surname", "Builder")); list.add(new Rec_Items(R.drawable.pfl_img, "Name Surname", "Designer")); list.add(new Rec_Items(R.drawable.pfl_img, "Name Surname", "Actress")); list.add(new Rec_Items(R.drawable.pfl_img, "Name Surname", "Programmer")); list.add(new Rec_Items(R.drawable.pfl_img, "Name Surname", "Builder")); list.add(new Rec_Items(R.drawable.pfl_img, "Name Surname", "Designer")); } }需要更改哪些内容？

Answer 1

您可以在设置适配器之前按专业字母顺序对列表进行排序：

List<Rec_Items> sortedList = new ArrayList();
if (list.size() > 0) {
    Collections.sort(list, new Comparator<Rec_Items>() {
        @Override
        public int compare(final Rec_Items object1, final Rec_Items object2) {
            return object1.getProfession().compareTo(object2.getProfession());
        }
    });
}

//                                  SORTED LIST
Adapter adapter = new Adapter(this, sortedList);

要显示每个部分的除数（行），您可以将其添加到xml设计上android:visibility="gone"，并显示前一项专业的首字母是否与当前的字母不同：

//Inside onBindViewHolder method:
if(position > 0){
        // [----------------PREVIOUS ITEM-----------------]       [------------------CURRENT ITEM------------------]
    if(!list.get(position-1).getProfession().substring(0,1).equals(list.get(position).getProfession().substring(0,1))){
        //Example: holder.getDivisor().setVisibility(View.VISIBLE);
    }
}

对于图标部分，您可以使用相同的逻辑。让它隐藏在xml设计中，并在项目是列表中的第一个项目时显示它，或者如果前一个项目专业的首字母不同，也就是说，当前项目是其中的第一个项目。您可以查看专业名称以设置相应的图像。

快乐的编码！

Answer 2

这是解决方案

@Override
public void onBindViewHolder(SupportersAdapter.MyViewHolder holder, int position) {
    holder.imageView.setImageResource(list.get(position).getImage());
    holder.fullName.setText(list.get(position).getFullName());
    holder.profession.setText(list.get(position).getProfession());

    //call button listener
    holder.buttonCall.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(context, "Whom you wanna call?", Toast.LENGTH_SHORT).show();
        }
    });

    //setting icons for each profession
    if (list.get(position).getProfession().equals("Actress")) {
        holder.icon.setImageResource(R.drawable.medical);
    }
    if (list.get(position).getProfession().equals("Builder")) {
        holder.icon.setImageResource(R.drawable.spanner);
    }
    if (list.get(position).getProfession().equals("Designer")) {
        holder.icon.setImageResource(R.drawable.shopping);
    }
    if (list.get(position).getProfession().equals("Programmer")) {
        holder.icon.setImageResource(R.drawable.education);
    }

    //setting first icon always visible
    if (position == 0) {
        holder.icon.setVisibility(View.VISIBLE);
    }

    //setting bottom view visible for dividing
    if (position + 1 < getItemCount()) {
        if (!list.get(position).getProfession().substring(0, 1).equals
                (list.get(position + 1).getProfession().substring(0, 1))) {
            holder.view.setVisibility(View.VISIBLE);
        }
    }

    //setting icon visible for group of profession
    if (position > 0) {
        if (!list.get(position).getProfession().substring(0, 1).equals
                (list.get(position - 1).getProfession().substring(0, 1))) {
            holder.icon.setVisibility(View.VISIBLE);
        }
    }
}

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

如何对recyclerView进行排序

2 个答案: