Android中的两个类型模型和FirebaseRecyclerAdapter [英] Two type models and FirebaseRecyclerAdapter in android
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);
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
}
}
}
这篇关于Android中的两个类型模型和FirebaseRecyclerAdapter的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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