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2020
12-02

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自学编程网。

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