RecyclerView通用适配器

在Android开发中使用列表呈现数据的情况很多，现在我们常用RecyclerView呈现列表，为了开发敏捷和代码优雅，我们现在来打造<?xml version="1.0" encoding="utf-8"?>

本文使用 dataBinding 数据绑定，不会的小伙自己去学习下吧

一、dataBinding配置，在build.gradle添加dataBinding配置，如下图所示

二、CommAdapter代码如下：

　　

package com.rx.baseadapter;

import android.databinding.DataBindingUtil;
import android.databinding.ViewDataBinding;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.util.List;

/**
 * author:puxiaobo
 * email:ggband520@163.com
 * date:2017/11/20
 * desc:  RecyclerView 公用Adapter;
 */

public abstract class CommAdapter<T> extends RecyclerView.Adapter<CommAdapter.ViewHolder> {

    private int brId;//databinding 实体ID 在布局文件定义
    private List<T> datas;
    private int itemRes;//itemView 布局文件
    private OnItemClickListener listener;
    private ViewDataBinding viewDataBinding;

    /**
     *
     * @param datas 数据
     * @param brId  实体ID 在布局文件定义
     * @param itemRes item布局资源ID
     */
    protected CommAdapter(List<T> datas, int brId, int itemRes) {
        this.datas = datas;
        this.brId = brId;
        this.itemRes = itemRes;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        viewDataBinding = DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()), itemRes, parent, false);
        ViewHolder viewHolder = new ViewHolder(viewDataBinding.getRoot());
        viewHolder.setViewDataBinding(viewDataBinding);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(CommAdapter.ViewHolder holder, int position) {
        if (brId != -1)
            holder.getViewDataBinding().setVariable(brId, datas.get(position));
        bindViewItemData(holder.getViewDataBinding(), position, datas.get(position), holder);
    }

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

    protected class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private ViewDataBinding viewDataBinding;

        public void setViewDataBinding(ViewDataBinding viewDataBinding) {
            this.viewDataBinding = viewDataBinding;
        }

        public ViewDataBinding getViewDataBinding() {
            return viewDataBinding;
        }

        public ViewHolder(View itemView) {
            super(itemView);
            itemView.setOnClickListener(this);
            viewDataBinding = (ViewDataBinding) itemView.getTag();

        }

        @Override
        public void onClick(View v) {
            if (listener != null)
                listener.onItemClick(v, getLayoutPosition());
        }
    }

    public void setDatas(List<T> datas) {
        this.datas = datas;

    }

    public void setOnItemClickListener( OnItemClickListener onItemClickListener) {
        this.listener = onItemClickListener;
    }

    public abstract void bindViewItemData(ViewDataBinding binding, int position, T t, ViewHolder holder);

    /**
     * item点击事件
     */
    public interface OnItemClickListener {
        void onItemClick(View item, long position);
    }
}

三、item布局文件view_fine_balance_item.xml

　　

<?xml version="1.0" encoding="utf-8"?>

<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>

        <variable
            name="monRecord"
            type="com.rx.baseadapter.MonRecord" />

    </data>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/white">

        <ImageView
            android:id="@+id/im_icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="8dip"
            android:layout_marginTop="8dip"
            android:src="@mipmap/ic_launcher" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/im_icon"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center_vertical"
                android:orientation="horizontal"
                android:padding="10dip">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">

                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="8dip"
                        android:orientation="horizontal">

                        <TextView
                            android:layout_width="0dip"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:text="@{monRecord.title}"
                            android:textSize="17sp" />

                        <TextView
                            android:layout_width="0dip"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:gravity="end"
                            android:text="@{monRecord.createdate}"
                            android:textSize="12sp" />

                    </LinearLayout>

                </LinearLayout>

            </LinearLayout>

        </LinearLayout>

    </RelativeLayout>

</layout>

四、测试布局文件activity_main.xml

　　

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.rx.baseadapter.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </android.support.v7.widget.RecyclerView>

</RelativeLayout>

五、使用 CommAdapter MainActivity

　　

package com.rx.baseadapter;

import android.databinding.ViewDataBinding;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;

    private List<MonRecord> monRecords;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();

    }

    private void init() {
        recyclerView = findViewById(R.id.rv);
        initData();
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(new CommAdapter<MonRecord>(monRecords, BR.monRecord, R.layout.view_fine_balance_item) {

            @Override
            public void bindViewItemData(ViewDataBinding binding, int position, MonRecord monRecord, CommAdapter.ViewHolder holder) {
                /**
                 * 这里可以扩展需求 （绑定数据）
                 */

//                ViewFineBalanceItemBinding itemBinding =  (ViewFineBalanceItemBinding)binding;
//                itemBinding.imIcon.setImageResource(R.mipmap.ic_launcher);

            }
        });

    }

    private void initData() {

        monRecords = new ArrayList<>();

        MonRecord monRecord = null;

        for (int i = 0; i < 20; i++) {
            monRecord = new MonRecord();
            monRecord.setBalance(25.4f);
            monRecord.setCreatedate("2017-08-09 08:34:55");
            monRecord.setPaymoney(32.76f);
            monRecord.setTitle("消费提示");
            monRecords.add(monRecord);
        }

    }

}

六、效果图