RecyccleView 详解

标签：recycleview

在谷歌的官网我们可以看到它是这样介绍的： RecyclerView  is a more advanced and flexible version of  ListView . This widget is a container for large sets of views that can be recycled and scrolled very efficiently. Use the  RecyclerView  widget when you have lists with elements that change dynamically.

RecyclerView比listview更先进更灵活，对于很多的视图它就是一个容器，可以有效的重用和滚动。当数据动态变化的时候请使用它。

RecyclerView  is easy to use, because it provides:

• A layout manager for positioning items
• Default animations for common item operations
• You also have the flexibility to define custom layout managers and animations for this widget.

RecyclerView使用起来很方便因为它提供：

它为item的定位提供一个layoutmanager

为item的操作提供一个缺省的animations

您还可以灵活地定义这个小部件的自定义布局管理器和动画

为了使用RecyclerVIew,你必须指定一个adapter和一个layoutmanager，为了创建一个adapter，你必须得继承RecyclerView.Adapter,详细的实现方法取决与你的数据集和你视图的类型。

Demo介绍不同于官网

这里就介绍完了下面我们就要做自己的Demo了。如果需要看官网的Demo那么请打开这里： 官方Demo

这里既然是详解那么就要与官方的Demo有不同，好了看看我们要做的效果吧。

实现图片文字按钮的混排。

首先还是看我的工程结构吧。

首先还是贴出我的main_acitivy.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="match_parent"
  android:orientation="vertical" >

 <!-- A RecyclerView with some commonly used attributes -->
<android.support.v7.widget.RecyclerView
  android:id="@+id/my_recycler_view"
  android:scrollbars="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent"/>
</LinearLayout>

其他几个xml就不用贴了，很简单的放了写TextVIew，ImgeView之类。

然后我们就来看看代码，首先是Bean里面的代码。

package com.androidl.bob;

/**
 * 实体包
 * 
 * @author edsheng
 * 
 */
public class Bean {
  public static final int Y_TYPE = 0; //view类型0
  public static final int X_TYPE = 1; //view类型2
  public static final int Z_TYPE = 2;//view 类型3
  private int type;
  private String text;

  public Bean(int type, String text) {
    super();
    this.type = type;
    this.text = text;
  }

  public int getType() {
    return type;
  }

  public void setType(int type) {
    this.type = type;
  }

  public String getText() {
    return text;
  }

  public void setText(String text) {
    this.text = text;
  }

}

然后是Adapter里面的代码：

package com.androidl.bob;

import java.util.List;

import com.example.androidl.R;

import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;


public class RecycleAdapter extends RecyclerView.Adapter<ViewHolder> {

  private List<Bean> beans;

  public RecycleAdapter(List<Bean> beans) {
    super();
    this.beans = beans;
  }

  /**
   * 内部TextHoler
   * 
   * 
   * 
   */
  public class TextHoler extends RecyclerView.ViewHolder {
    public TextView textView;

    public TextHoler(View textview) {
      super(textview);
      this.textView = (TextView) textview.findViewById(R.id.mytext);
    }
  }

  /**
   * iamgeHolder
   * 
   * @author edsheng
   * 
   */
  public class ImageHoler extends RecyclerView.ViewHolder {
    public ImageView Imageview;

    public ImageHoler(View textview) {
      super(textview);
      this.Imageview = (ImageView) textview.findViewById(R.id.myiamge);
    }
  }

  /**
   * 按钮的holder
   * 
   * 
   * 
   */
  public class ButtonHolder extends RecyclerView.ViewHolder {
    public Button button;

    public ButtonHolder(View textview) {
      super(textview);
      this.button = (Button) textview.findViewById(R.id.mybutton);
    }
  }

  @Override
  public int getItemCount() {
    // TODO Auto-generated method stub
    return beans.size();
  }

  /**
   * 获取消息的类型
   */
  @Override
  public int getItemViewType(int position) {
    // TODO Auto-generated method stub
    return beans.get(position).getType();
  }

  /**
   * 创建VIewHolder
   */
  @Override
  public ViewHolder onCreateViewHolder(ViewGroup parent, int viewtype) {
    // TODO Auto-generated method stub
    View v = null;
    ViewHolder holer = null;
    switch (viewtype) {
    case Bean.X_TYPE:
      v = LayoutInflater.from(parent.getContext()).inflate(
          R.layout.recylce_item_x, null);
      holer = new TextHoler(v);
      break;
    case Bean.Y_TYPE:
      v = LayoutInflater.from(parent.getContext()).inflate(
          R.layout.recylce_item_y, null);
      holer = new ButtonHolder(v);
      break;
    case Bean.Z_TYPE:
      v = LayoutInflater.from(parent.getContext()).inflate(
          R.layout.recylce_item_z, null);
      holer = new ImageHoler(v);
      break;
    }

    return holer;
  }

  /**
   * 绑定viewholder
   */
  @Override
  public void onBindViewHolder(ViewHolder holder, int position) {
    // TODO Auto-generated method stub
    switch (getItemViewType(position)) {
    case Bean.X_TYPE:
      TextHoler textholer = (TextHoler) holder;
      textholer.textView.setText(beans.get(position).getText());
      break;
    case Bean.Y_TYPE:
      ButtonHolder buttonHolder = (ButtonHolder) holder;
      buttonHolder.button.setText(beans.get(position).getText());
      break;
    case Bean.Z_TYPE:
      ImageHoler imageHoler = (ImageHoler) holder;
      // imageHoler.Imageview.setImageResource(android.R.drawable.checkbox_on_background);
      break;
    }
  }
}

最后是activity的代码。

package com.androidl.bob;

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

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import com.example.androidl.R;

public class Mainactivity extends Activity {
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);
     RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);

//		// improve performance if you know that changes in content
//		// do not change the size of the RecyclerView
//		 mRecyclerView.setHasFixedSize(true);

     //创建布局管理器
    LinearLayoutManager mLayoutManager = new LinearLayoutManager(this);
    mLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    mRecyclerView.setLayoutManager(mLayoutManager);

    //初始化数据
    List<Bean> myDataset = new ArrayList<Bean>();

    myDataset.add(new Bean(Bean.Z_TYPE, "图片"));
    myDataset.add(new Bean(Bean.X_TYPE, "文字"));
    myDataset.add(new Bean(Bean.Y_TYPE, "按钮"));
    myDataset.add(new Bean(Bean.Z_TYPE, "图片"));
    myDataset.add(new Bean(Bean.X_TYPE, "shit"));
    myDataset.add(new Bean(Bean.X_TYPE, "我擦"));
    myDataset.add(new Bean(Bean.Z_TYPE, "图片"));
    myDataset.add(new Bean(Bean.Y_TYPE, "按钮"));
    myDataset.add(new Bean(Bean.Y_TYPE, "按钮"));
    myDataset.add(new Bean(Bean.X_TYPE, "文字"));
    //创建Adapter
    RecycleAdapter mAdapter = new RecycleAdapter(myDataset);
    mRecyclerView.setAdapter(mAdapter);

  }

RecyccleView 详解

标签：recycleview

原文地址：http://blog.csdn.net/fangchao3652/article/details/43148871