RecyclerView优雅实现复杂列表布局

这次学习的内容是使用RecyclerView来实现一些较为复杂的布局，比如一个item：

最左边是一个imageview，中间部分为textView，textView下面又是一个textView，最右边为一个imageview。

1、首先在activity_main.xml中添加RecyclerView，随后正如之前所说的分别针对左中右新建3个XML布局文件命名为item_type_one、two、three.随后对其进行布局配置。

2、新建一个adapter添加模拟数据。然后针对布局新建三个viewholder。随后新建一个抽象类TypeAbstractViewHolder，将三个viewholder用到的同一个方法封装起来调用,将三个viewHolder继承自抽象类。为了优雅。

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context="com.example.tony.recyclerviewdemo.MainActivity">

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

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

</RelativeLayout>

item_type_one.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="60dp"
 xmlns:tools="http://schemas.android.com/tools"
 android:background="@android:color/white"
 android:gravity="center_vertical"
 android:orientation="horizontal">

 <ImageView
  android:id="@+id/avatar"
  android:layout_width="40dp"
  android:layout_height="40dp"
  android:layout_marginLeft="20dp" />

 <TextView
  tools:text = "月满轩尼诗"
  android:id="@+id/name"
  android:layout_marginLeft="20dp"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" />
</LinearLayout>

item_type_two.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="60dp"
 android:background="@android:color/white"
 android:gravity="center_vertical"
 android:orientation="horizontal">

 <ImageView
  android:id="@+id/avatar"
  android:layout_width="40dp"
  android:layout_height="40dp"
  android:layout_marginLeft="20dp" />

 <LinearLayout
  android:layout_marginLeft="20dp"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:orientation="vertical">

  <TextView
   android:id="@+id/name"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   tools:text="月满轩尼诗" />

  <TextView
   android:id="@+id/content"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginTop="5dp"
   tools:text="月满轩尼诗是一部好电影吗？" />

 </LinearLayout>


</LinearLayout>

item_type_three.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="60dp"
 android:background="@android:color/white"
 android:gravity="center_vertical"
 android:orientation="horizontal">

 <ImageView
  android:id="@+id/avatar"
  android:layout_width="40dp"
  android:layout_height="40dp"
  android:layout_centerVertical="true"
  android:layout_marginLeft="20dp" />

 <ImageView
  android:id="@+id/contentImage"
  android:layout_width="100dp"
  android:layout_height="60dp"
  android:layout_alignParentRight="true"
  android:layout_centerVertical="true"
  android:layout_marginLeft="20dp"
  android:layout_marginRight="20dp" />

 <LinearLayout
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginLeft="20dp"
  android:orientation="vertical"
  android:layout_centerVertical="true"
  android:layout_toRightOf="@+id/avatar"
  android:layout_toEndOf="@+id/avatar"
  android:layout_marginStart="20dp">

  <TextView
   android:id="@+id/name"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   tools:text="月满轩尼诗" />

  <TextView
   android:id="@+id/content"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginTop="5dp"
   tools:text="月满轩尼诗是一部好电影吗？" />

 </LinearLayout>


</RelativeLayout>

这边提一个小技巧，一般textview如果不设置文本内容的话是无法预览的，这里我们在属性中添加一个：tools:text=”abc”;
这个时候abc就会在UI上面显示出来了，而且abc也不用加入string.xml.

Java文件：

MAinActivity.class

package com.example.tony.recyclerviewdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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 mRecyclerView;

 private DemoAdapter mAdapter;

 int colors[] = {android.R.color.holo_blue_light,
     android.R.color.holo_orange_light,
     android.R.color.holo_red_light};

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

  mRecyclerView = (RecyclerView) findViewById(R.id.recycleView);
  mRecyclerView.setLayoutManager(new LinearLayoutManager(this,
    LinearLayoutManager.VERTICAL, false));
  mAdapter = new DemoAdapter(this);
  mRecyclerView.setAdapter(mAdapter);

  initData();
 }

 private void initData() {
  List<DataModel> list = new ArrayList<>();

  for (int i = 0; i < 20; i++) {
   int type = (int) (Math.random() * 3 + 1);
   DataModel data = new DataModel();
   data.avatarColor = colors[type - 1];
   data.type = type;
   data.name = "Name: " + i;
   data.content = "Content: " + i;
   data.contentColor = colors[(type + 1) % 3];
   list.add(data);
  }
  mAdapter.addList(list);
  mAdapter.notifyDataSetChanged();
 }
}

DemoAdapter.class

package com.example.tony.recyclerviewdemo;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.ViewGroup;

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

/*
 * Created by Tony on 2016/12/3.
 */

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


 private LayoutInflater mLayoutInflater;

 private List<DataModel> mList = new ArrayList<>();

 public DemoAdapter(Context context) {
  mLayoutInflater = LayoutInflater.from(context);
 }

 public void addList(List<DataModel> list) {
  mList.addAll(list);
 }

 @Override
 public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  switch (viewType) {
   case DataModel.TYPE_ONE:
    return new TypeOneViewHolder(mLayoutInflater.inflate(R.layout.item_type_one, parent, false));
   case DataModel.TYPE_TWO:
    return new TypeTwoViewHolder(mLayoutInflater.inflate(R.layout.item_type_two, parent, false));
   case DataModel.TYPE_THREE:
    return new TypeThreeViewHolder(mLayoutInflater.inflate(R.layout.item_type_three, parent, false));
  }
  return null;
 }


 @Override
 public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
  ((TypeAbstractViewHolder) holder).bindHolder(mList.get(position));
 }

 @Override
 public int getItemViewType(int position) {
  return mList.get(position).type;
 }

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

DataModel.class

package com.example.tony.recyclerviewdemo;

/**
 * Created by Tony on 2016/12/3.
 */

public class DataModel {

 public static final int TYPE_ONE = 1;
 public static final int TYPE_TWO = 2;
 public static final int TYPE_THREE = 3;
 public int type;
 public int avatarColor;
 public String name;
 public String content;
 public int contentColor;
}

TypeAbstractViewHolder.class

package com.example.tony.recyclerviewdemo;

import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 * Created by Tony on 2016/12/3.
 */

public abstract class TypeAbstractViewHolder extends RecyclerView.ViewHolder{

 public TypeAbstractViewHolder(View itemView) {
  super(itemView);
 }
 public abstract void bindHolder(DataModel model);
}

TypeOneViewHolder.class

package com.example.tony.recyclerviewdemo;

import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * Created by Tony on 2016/12/3.
 */

public class TypeOneViewHolder extends TypeAbstractViewHolder {

 private ImageView avatar;
 private TextView name;
 public TypeOneViewHolder(View itemView) {
  super(itemView);

  avatar = (ImageView) itemView.findViewById(R.id.avatar);
  name = (TextView) itemView.findViewById(R.id.name);
 }
 //ViewHolder数据和外面数据绑定起来
 @Override
 public void bindHolder(DataModel model) {
  avatar.setBackgroundResource(model.avatarColor);
  name.setText(model.name);
 }
}

TypeTwoViewHolder.class

package com.example.tony.recyclerviewdemo;

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * Created by Tony on 2016/12/3.
 */

public class TypeTwoViewHolder extends TypeAbstractViewHolder {

 private ImageView avatar;
 private TextView name;
 private TextView content;
 public TypeTwoViewHolder(View itemView) {
  super(itemView);

  avatar = (ImageView) itemView.findViewById(R.id.avatar);
  name = (TextView) itemView.findViewById(R.id.name);
  content = (TextView) itemView.findViewById(R.id.content);
 }
 //ViewHolder数据和外面数据绑定起来
 @Override
 public void bindHolder(DataModel model) {
  avatar.setBackgroundResource(model.avatarColor);
  name.setText(model.name);
  content.setText(model.content);
 }
}

TypeThreeViewHolder.class

package com.example.tony.recyclerviewdemo;

import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * Created by Tony on 2016/12/3.
 */

public class TypeThreeViewHolder extends TypeAbstractViewHolder {

 private ImageView avatar;
 private TextView name;
 private TextView content;
 private ImageView contentImage;
 public TypeThreeViewHolder(View itemView) {
  super(itemView);

  avatar = (ImageView) itemView.findViewById(R.id.avatar);
  contentImage = (ImageView) itemView.findViewById(R.id.contentImage);
  name = (TextView) itemView.findViewById(R.id.name);
  content = (TextView) itemView.findViewById(R.id.content);
 }
 //ViewHolder数据和外面数据绑定起来
 @Override
 public void bindHolder(DataModel model) {
  avatar.setBackgroundResource(model.avatarColor);
  name.setText(model.name);
  contentImage.setBackgroundResource(model.contentColor);
  content.setText(model.content);
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持呐喊教程。

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