d中的两个类型模型和FirebaseRecyclerAdapte

d中的两个类型模型和FirebaseRecyclerAdapte

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Android中的两个类型模型和FirebaseRecyclerAdapter

本文介绍了Android中的两个类型模型和FirebaseRecyclerAdapter的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我的firebase数据库中有两种类型的产品，它们是以下几种。



型号：ProductTypeOne.java 

  package fyp.hkust.facet.model; 
 
 import java.util.ArrayList; 
 
 public class ProductTypeOne {
 
 private String name; 
私人字符串品牌; 
 private String desc; 
 private String image; 
私人字符串用户名; 
 private String uid; 
 private ArrayList< ArrayList< String>>颜色; 
 
 public Product（）
 {
 
} 
 
 public Product（String name，String brand，String desc，String image，String username，String uid，ArrayList< ArrayList< String>> color）{
 this.name = name; 
 this.brand =品牌; 
 this.desc = desc; 
 this.image = image; 
 this.username = username; 
 this.uid = uid; 
 this.color = color; 
} 
 
 public String getName（）{
 
 return name; 
} 
 
 public void setName（String name）{
 this.name = name; 
} 
 
 public String getBrand（）{
 return brand; 
} 
 
 public void setBrand（String brand）{
 this.brand = brand; 
} 
 
 public String getDesc（）{
 return desc; 
} 
 
 public void setDesc（String desc）{
 this.desc = desc; 
} 
 
 public String getImage（）{
 return image; 
} 
 
 public void setImage（String image）{
 this.image = image; 
} 
 
 public String getUsername（）{
 return username; 
 
 
 public void setUsername（String username）{
 this.username = username; 
} 
 
 public String getUid（）{
 return uid; 
 
 $ b $ public void setUid（String uid）{
 this.uid = uid; 
} 
 
 public ArrayList< ArrayList< String>> getColor（）{
返回颜色; 
 
 
 public void setColor（ArrayList< ArrayList< String>> color）{
 this.color = color; 
 
 
 $ b code 
 $ b 
 Model：ProductTypeTwo.java  p> 
 
 
  package fyp.hkust.facet.model; 
 
 import java.util.ArrayList; 
 
 public class ProductTypeTwo {
 
 private String name; 
私人字符串品牌; 
 private String desc; 
 private String image; 
私人字符串用户名; 
 private String uid; 
 private ArrayList< String>颜色; 
 
 public Product（）
 {
 
} 
 
 public Product（String name，String brand，String desc，String image，String username，String uid，ArrayList< String> color）{
 this.name = name; 
 this.brand =品牌; 
 this.desc = desc; 
 this.image = image; 
 this.username = username; 
 this.uid = uid; 
 this.color = color; 
} 
 
 public String getName（）{
 
 return name; 
} 
 
 public void setName（String name）{
 this.name = name; 
} 
 
 public String getBrand（）{
 return brand; 
} 
 
 public void setBrand（String brand）{
 this.brand = brand; 
} 
 
 public String getDesc（）{
 return desc; 
} 
 
 public void setDesc（String desc）{
 this.desc = desc; 
} 
 
 public String getImage（）{
 return image; 
} 
 
 public void setImage（String image）{
 this.image = image; 
} 
 
 public String getUsername（）{
 return username; 
 
 
 public void setUsername（String username）{
 this.username = username; 
} 
 
 public String getUid（）{
 return uid; 
 
 $ b $ public void setUid（String uid）{
 this.uid = uid; 
} 
 
 public ArrayList< String> getColor（）{
返回颜色; 
 
 
 public void setColor（ArrayList< String> color）{
 this.color = color; 
 
 
 $ b code 
 $ b  
 
  
 
 
有一个指标可以检测出他们的类型。我如何检测他们的类型来选择合适的模型来获取他们？请给我一些帮助。 
  FirebaseRecyclerAdapter< Product，ProductViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter< Product，ProductViewHolder>（
 
 Product.class，
 R.layout.product_row，
 ProductViewHolder.class，
 mDatabase 
 
 $ {
 @Override 
 protected void populateViewHolder（ProductViewHolder viewHolder，Product model，int position）{
 
 Log.d（TAG，loading view+ position） ; 
 final String product_id = getRef（position）.getKey（）; 
 viewHolder.setTitle（model.getName（））; 
 viewHolder.setDesc（model.getDesc（））; 
 viewHolder.setImage（getApplicationContext（），model.getImage（））; 
 viewHolder.setUsername（model.getUsername（））; 
 
 viewHolder.mView.setOnClickListener（new View.OnClickListener（）{
 @Override $ b $ public void onClick（View v）{
 Intent productDetailIntent = new Intent（） ; 
 productDetailIntent.setClass（MainActivity.this，ProductDetailActivity.class）; 
 productDetailIntent.putExtra（product_id，product_id）; 
 Log.d（TAG +product_id，product_id）; 
 startActivity（productDetailIntent）; 
} 
}）; 
 
 Log.d（TAG，finish loading view）; 
} 
}; 
 
 mProductList.setAdapter（firebaseRecyclerAdapter）; 
  
 
 
解决方案
 像这样创建自定义适配器 
 类PersonAdapter扩展了FirebaseRecyclerAdapter< Person，RecyclerView.ViewHolder> {
 
 PersonAdapter（Class< Person> modelClass，DatabaseReference ref）{
 super（modelClass，0，RecyclerView.ViewHolder.class，ref）; 
 
 $ b @Override 
 public RecyclerView.ViewHolder onCreateViewHolder（ViewGroup parent，int viewType）{
 switch（viewType）{$ b $ case Person.PersonType。 TYPE_1：
 View userType1 = LayoutInflater.from（parent.getContext（））
 .inflate（R.layout.item_person_type_1，parent，false）; 
返回新的PersonType1ViewHolder（userType1）; 
 case Person.PersonType.TYPE_2：
 View userType2 = LayoutInflater.from（parent.getContext（））
 .inflate（R.layout.item_person_type_2，parent，false）; 
返回新的PersonType2ViewHolder（userType2）; 
} 
返回super.onCreateViewHolder（parent，viewType）; 
 
 $ b $覆盖
保护无效populateViewHolder（RecyclerView.ViewHolder viewHolder，Person模型，
 int位置）{
 if（viewHolder instanceof PersonType1ViewHolder）{ 
（（PersonType1ViewHolder）viewHolder）.name.setText（Full name：+ model.getName（））; 
 return; $（$）
 
 
 if（viewHolder instanceof PersonType2ViewHolder）{
（（PersonType2ViewHolder）viewHolder）.name.setText（Full name：+ model.getName（））; （PersonType2ViewHolder）viewHolder）.tvAge.setText（Age：+ model.getAge（））; 
 
 
 
 private class PersonType1ViewHolder extends RecyclerView.ViewHolder {
 TextView name; 
 
 PersonType1ViewHolder（View itemView）{
 super（itemView）; 
 name =（TextView）itemView.findViewById（R.id.tvName）; 
 
 
 
 private class PersonType2ViewHolder extends RecyclerView.ViewHolder {
 TextView name; 
 TextView tvAge; 
 
 PersonType2ViewHolder（查看itemView）{
 super（itemView）; 
 name =（TextView）itemView.findViewById（R.id.tvName）; 
 tvAge =（TextView）itemView.findViewById（R.id.tvAge）; 
 
 
 
 @Override 
 public int getItemViewType（int position）{
 return getItem（position）.getType（）; 
 
 $ b  
 模型类（Person） 
  public class Person {
 public String name; 
 public int age; 
 public int type; 
 $ b $ @ @Dent（{PersonType.TYPE_1，PersonType.TYPE_2}）
 public @interface PersonType {
 int TYPE_1 = 1; 
 int TYPE_2 = 2; 
 
 
 
 code 
 
 $ b 
  Activity  
 
 $ b 
  PersonAdapter adapter = new PersonAdapter（Person.class，myFirebaseRef）; 
 mRecyclerView.setAdapter（adapter）; 
  
 
 
 
我的Firebase数据库json看起来像 
 
 
  {
students：{
-KgX6BkMc-zaxk6E7ohB：{
age：23，
name：Linh，
type：1 
}，
-KgX6UCjrTYmPgFUrgTY：{
age：23，
name：Linh，
type：2 
}，
 - KgX7G9MdE8rm0PspZp3：{
age：23，
name：Linh，
type：1 
}，
s1：{ 
age：31，
name：John，
type：2 
}，
s2：{
 age：31，
name：J ohn，
type：1 
}，
s3：{
age：31，
name：John，
type：2 
}，
s4：{
age：31，
name：John，
键入：
 
 
 
 $ c $
I have two types of product in my firebase db which are the following.



Model : ProductTypeOne.java
package fyp.hkust.facet.model;

import java.util.ArrayList;

public class ProductTypeOne {

private String name;
private String brand;
private String desc;
private String image;
private String username;
private String uid;
private ArrayList<ArrayList<String>> color;

public Product()
{

}

public Product(String name,String brand, String desc, String image,String username,String uid,ArrayList<ArrayList<String>> color) {
    this.name = name;
    this.brand = brand;
    this.desc = desc;
    this.image = image;
    this.username = username;
    this.uid = uid;
    this.color = color;
}

public String getName() {

    return name;
}

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

public String getBrand() {
    return brand;
}

public void setBrand(String brand) {
    this.brand = brand;
}

public String getDesc() {
    return desc;
}

public void setDesc(String desc) {
    this.desc = desc;
}

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public String getUid() {
    return uid;
}

public void setUid(String uid) {
    this.uid = uid;
}

public ArrayList<ArrayList<String>> getColor() {
    return color;
}

public void setColor(ArrayList<ArrayList<String>> color) {
    this.color = color;
}

}

Model : ProductTypeTwo.java
package fyp.hkust.facet.model;

import java.util.ArrayList;

public class ProductTypeTwo {

private String name;
private String brand;
private String desc;
private String image;
private String username;
private String uid;
private ArrayList<String> color;

public Product()
{

}

public Product(String name,String brand, String desc, String image,String username,String uid,ArrayList<String> color) {
    this.name = name;
    this.brand = brand;
    this.desc = desc;
    this.image = image;
    this.username = username;
    this.uid = uid;
    this.color = color;
}

public String getName() {

    return name;
}

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

public String getBrand() {
    return brand;
}

public void setBrand(String brand) {
    this.brand = brand;
}

public String getDesc() {
    return desc;
}

public void setDesc(String desc) {
    this.desc = desc;
}

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public String getUid() {
    return uid;
}

public void setUid(String uid) {
    this.uid = uid;
}

public ArrayList<String> getColor() {
    return color;
}

public void setColor(ArrayList<String> color) {
    this.color = color;
}

}

There is an indicator for me to detect that their type. How can I detect their type to choose the right model to get them? Please give me some helps. Thank you very much.
 FirebaseRecyclerAdapter<Product, ProductViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Product, ProductViewHolder>(

            Product.class,
            R.layout.product_row,
            ProductViewHolder.class,
            mDatabase

    ) {
        @Override
        protected void populateViewHolder(ProductViewHolder viewHolder, Product model, int position) {

            Log.d(TAG, "loading view " + position);
            final String product_id = getRef(position).getKey();
            viewHolder.setTitle(model.getName());
            viewHolder.setDesc(model.getDesc());
            viewHolder.setImage(getApplicationContext(), model.getImage());
            viewHolder.setUsername(model.getUsername());

            viewHolder.mView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent productDetailIntent = new Intent();
                    productDetailIntent.setClass(MainActivity.this, ProductDetailActivity.class);
                    productDetailIntent.putExtra("product_id", product_id);
                    Log.d(TAG + " product_id", product_id);
                    startActivity(productDetailIntent);
                }
            });

            Log.d(TAG, "finish loading view");
        }
    };

    mProductList.setAdapter(firebaseRecyclerAdapter);

 解决方案 
Create Custom Adapter like this
class PersonAdapter extends FirebaseRecyclerAdapter<Person, RecyclerView.ViewHolder> {

    PersonAdapter(Class<Person> modelClass, DatabaseReference ref) {
        super(modelClass, 0, RecyclerView.ViewHolder.class, ref);
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType) {
            case Person.PersonType.TYPE_1:
                View userType1 = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.item_person_type_1, parent, false);
                return new PersonType1ViewHolder(userType1);
            case Person.PersonType.TYPE_2:
                View userType2 = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.item_person_type_2, parent, false);
                return new PersonType2ViewHolder(userType2);
        }
        return super.onCreateViewHolder(parent, viewType);
    }

    @Override
    protected void populateViewHolder(RecyclerView.ViewHolder viewHolder, Person model,
            int position) {
        if (viewHolder instanceof PersonType1ViewHolder) {
            ((PersonType1ViewHolder) viewHolder).name.setText("Full name: " + model.getName());
            return;
        }

        if (viewHolder instanceof PersonType2ViewHolder) {
            ((PersonType2ViewHolder) viewHolder).name.setText("Full name: " + model.getName());
            ((PersonType2ViewHolder) viewHolder).tvAge.setText("Age: " + model.getAge());
        }
    }

    private class PersonType1ViewHolder extends RecyclerView.ViewHolder {
        TextView name;

        PersonType1ViewHolder(View itemView) {
            super(itemView);
            name = (TextView) itemView.findViewById(R.id.tvName);
        }
    }

    private class PersonType2ViewHolder extends RecyclerView.ViewHolder {
        TextView name;
        TextView tvAge;

        PersonType2ViewHolder(View itemView) {
            super(itemView);
            name = (TextView) itemView.findViewById(R.id.tvName);
            tvAge = (TextView) itemView.findViewById(R.id.tvAge);
        }
    }

    @Override
    public int getItemViewType(int position) {
        return getItem(position).getType();
    }
}

Model class (Person)
public class Person {
    public String name;
    public int age;
    public int type;

    @IntDef({PersonType.TYPE_1, PersonType.TYPE_2 })
    public @interface PersonType {
        int TYPE_1 = 1;
        int TYPE_2 = 2;
    }
    ...
}

In Activity
PersonAdapter adapter = new PersonAdapter(Person.class, myFirebaseRef);
mRecyclerView.setAdapter(adapter);

FULL DEMO
My Firebase database json will look like
{
  "students" : {
    "-KgX6BkMc-zaxk6E7ohB" : {
      "age" : 23,
      "name" : "Linh",
      "type" : 1
    },
    "-KgX6UCjrTYmPgFUrgTY" : {
      "age" : 23,
      "name" : "Linh",
      "type" : 2
    },
    "-KgX7G9MdE8rm0PspZp3" : {
      "age" : 23,
      "name" : "Linh",
      "type" : 1
    },
    "s1" : {
      "age" : 31,
      "name" : "John",
      "type" : 2
    },
    "s2" : {
      "age" : 31,
      "name" : "John",
      "type" : 1
    },
    "s3" : {
      "age" : 31,
      "name" : "John",
      "type" : 2
    },
    "s4" : {
      "age" : 31,
      "name" : "John",
      "type" : 2
    }
  }
}

                        
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08-29 05:57
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