RecyclerView + Databinding data binding (ii)

An article on the record list view and implement databinding data binding, now re-record a note data bindings that are, in fact, the two have many similarities, after all, it is equal to ten recycleview list view of a version upgrade but there are some differences

The Code

看这个文章之前建议先看上一篇文章 <list view + databinding 实现数据绑定>

Listview + Databinding data binding (a)

What do not understand, welcome to comment

1.创建实体类

View what data is needed, although the class is created entity

package com.primer.gaotest.mvp.control.messageDao;

import android.graphics.drawable.Drawable;

public class MessageDao {
    private String name;
    private String message;
    private Drawable logo;

    public String getName() {
        return name;
    }

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

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public Drawable getLogo() {
        return logo;
    }

    public void setLogo(Drawable logo) {
        this.logo = logo;
    }

    public MessageDao(String name, String message, Drawable logo) {
        this.name = name;
        this.message = message;
        this.logo = logo;
    }
}

2.创建item布局

A description of each item view showing the effect of

<?xml version="1.0" encoding="utf-8"?>
<layout  xmlns:android="http://schemas.android.com/apk/res/android">

    <data>
        <variable
            name="message"
            type="com.primer.gaotest.mvp.control.messageDao.MessageDao" />
    </data>

    <RelativeLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="60dp">

        <de.hdodenhof.circleimageview.CircleImageView
            android:id="@+id/message_item_logo"
            android:background="@{message.logo}"
            android:layout_marginLeft="20dp"
            android:layout_centerVertical="true"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:src="@{message.logo}"/>



      <!--  <ImageView
            android:id="@+id/message_item_logo"
            android:background="@{message.logo}"
            android:layout_marginLeft="20dp"
            android:layout_centerVertical="true"
            android:layout_width="50dp"
            android:layout_height="50dp">

        </ImageView>-->

        <TextView
            android:textColor="@color/black"
            android:textSize="16sp"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"
            android:id="@+id/message_item_name"
            android:text="@{message.name??`没有数据`}"
            android:layout_marginLeft="25dp"
            android:layout_toRightOf="@+id/message_item_logo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

        </TextView>

        <TextView
            android:id="@+id/message_item_message"
            android:textSize="13sp"
            android:text="@{message.message??`没有数据`}"
            android:layout_marginLeft="25dp"
            android:layout_toRightOf="@id/message_item_logo"
            android:layout_below="@id/message_item_name"
            android:layout_centerVertical="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

        </TextView>

    </RelativeLayout>


</layout>

3.常见适配器Adapter

public class MessageRcycAdapter extends RecyclerView.Adapter<MessageRcycAdapter.ViewHolder> {

    private List<MessageDao> data;

    public MessageRcycAdapter(List<MessageDao> data) {
        this.data = data;
    }

    /**
     * 更新数据
     * @param data
     */
    public void updateData(ArrayList<MessageDao> data) {
        this.data = data;
        notifyDataSetChanged();
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        ViewDataBinding binding = DataBindingUtil.inflate(inflater, R.layout.message_rcyc_item, parent, false);
        ViewHolder viewHolder = new ViewHolder(binding.getRoot());
        viewHolder.setBinding(binding);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.getBinding().setVariable(com.primer.gaotest.BR.message,data.get(position));
        holder.getBinding().executePendingBindings();
    }

    @Override
    public int getItemCount() {
        return data == null ? 0 : data.size();
    }


    public static class ViewHolder extends RecyclerView.ViewHolder {

        private ViewDataBinding binding;
        private TextView message;
        private TextView name;
        private ImageView logo;

        public ViewHolder(View itemView) {
            super(itemView);
            message =  itemView.findViewById(R.id.message_item_message);
            name =  itemView.findViewById(R.id.message_item_name);
            logo =  itemView.findViewById(R.id.message_item_logo);
        }

        public ViewDataBinding getBinding() {
            return binding;
        }

        public void setBinding(ViewDataBinding binding) {
            this.binding = binding;
        }

        public TextView getMessage() {
            return message;
        }

        public void setMessage(TextView message) {
            this.message = message;
        }

        public TextView getName() {
            return name;
        }

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

        public ImageView getLogo() {
            return logo;
        }

        public void setLogo(ImageView logo) {
            this.logo = logo;
        }
    }
}

4.展示数据

public class MessageActivity extends AppCompatActivity {

    private  ActivityMessageBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_message);
        binding = DataBindingUtil.setContentView(MessageActivity.this, R.layout.activity_message);

        List<MessageDao> data = new ArrayList<MessageDao>();
        data.add(new MessageDao("Primer","我的简历",getResources().getDrawable(R.drawable.about_head_test)));
        data.add(new MessageDao("KG","我的简历",getResources().getDrawable(R.drawable.about_head_test)));
        data.add(new MessageDao("Git","我的简历",getResources().getDrawable(R.drawable.about_head_test)));
        data.add(new MessageDao("CPP","我的简历",getResources().getDrawable(R.drawable.about_head_test)));
        data.add(new MessageDao("Java攻城狮","我的简历",getResources().getDrawable(R.drawable.about_head_test)));

        binding.setVariable(com.primer.gaotest.BR.messageAdapter,new MessageRcycAdapter(data));

    }
}

Sometimes easy to overlook the fact recycle view data can not be displayed

Remember to add and then recycle view layout management
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"

<androidx.recyclerview.widget.RecyclerView
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            app:layout_constraintTop_toBottomOf="@id/employee_dynamics_title"
            app:adapter="@{employeeDynamicAdapter}"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            tools:ignore="MissingConstraints">

        </androidx.recyclerview.widget.RecyclerView>