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Android RecyclerView加载不同布局简单实现

2019年07月24日 | 移动技术网IT编程 | 我要评论

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前言

关于recyclerview的使用这里就不在赘述了,相信网上一搜一大把(本人之前的文章也有简单的使用介绍),这次我们讲的是recyclerview在使用的过程中,有时候会根据不同的位置加载不同的布局的简单实现,这里只是起到抛砖引玉的作用

效果图

设计思想
•重写recyclerview.adapter的getitemviewtype(int position),
在此方法中根据不同的position，设置不同的viewtype
•编写具体的recyclerview.viewholder子类(不同子类对应不同view或layout)
•重写recyclerview.adapter的oncreateviewholder(viewgroup parent,int viewtype)
在此方法中根据我们之前设置的viewtype来返回不同的recyclerview.viewholder的子类

代码

使用recyclerview需要添加依赖

compile 'com.android.support:recyclerview-v7:24.1.1'

首先是mainactivity布局,很简单的布局

<?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="match_parent"
  tools:context="com.example.hfs.recyclerviewloadlayout.mainactivity">

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

然后是mainactivity代码

package com.example.hfs.recyclerviewloadlayout;

import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.recyclerview;
import android.view.view;
import android.widget.toast;

import java.util.arraylist;
import java.util.list;

public class mainactivity extends appcompatactivity {

  private recyclerview mrecyclerview;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);

    initview();

    initdata();
  }

  private void initdata() {
    list<string> descs = new arraylist<>();
    descs.clear();

    list<integer> images = new arraylist<>();
    images.clear();

    for (int i = 1; i < 21; i++) {
      descs.add("测试数据" + (i < 10 ? "0" + i : i));
    }

    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);
    images.add(r.mipmap.ic_launcher);

    myadapter adapter = new myadapter(mainactivity.this, descs, images);
    mrecyclerview.setadapter(adapter);
    recyclerview.layoutmanager manager = new linearlayoutmanager(mainactivity.this, linearlayoutmanager.vertical, false);
    mrecyclerview.setlayoutmanager(manager);
    mrecyclerview.additemdecoration(new divideritemdecoration(mainactivity.this, divideritemdecoration.vertical_list));

    adapter.setmonitemclicklistener(new myadapter.onitemclicklistener() {
      @override
      public void onitemclick(view view, int position) {
        toast.maketext(mainactivity.this, "点击了" + position + "位置", toast.length_short).show();
      }
    });
  }

  private void initview() {
    mrecyclerview= (recyclerview) findviewbyid(r.id.recyclerview);
  }
}

然后是我们的适配器

package com.example.hfs.recyclerviewloadlayout;

import android.content.context;
import android.support.v7.widget.recyclerview;
import android.view.view;
import android.view.viewgroup;
import android.widget.imageview;
import android.widget.textview;

import java.util.arraylist;
import java.util.list;

/**
 * created by hfs on 2016/8/24.
 */
public class myadapter extends recyclerview.adapter<recyclerview.viewholder> {

  private context mcontext;
  private list<string> descs;
  private list<integer> images;
  private list<object> alllist;

  private static final int textview_viewtype = 1;
  private static final int imageview_viewtype = 2;

  public interface onitemclicklistener {
    void onitemclick(view view, int position);
  }

  private onitemclicklistener monitemclicklistener;

  public onitemclicklistener getmonitemclicklistener() {
    return monitemclicklistener;
  }

  public void setmonitemclicklistener(onitemclicklistener monitemclicklistener) {
    this.monitemclicklistener = monitemclicklistener;
  }

  public myadapter(context mcontext, list<string> descs, list<integer> images) {
    this.mcontext = mcontext;
    this.descs = descs;
    this.images = images;

    alllist = new arraylist<>();
    alllist.clear();
    for (int i = 0; i < descs.size(); i++) {
      alllist.add(descs.get(i));
      alllist.add(images.get(i));
    }
  }

  @override
  public recyclerview.viewholder oncreateviewholder(viewgroup parent, int viewtype) {
    recyclerview.viewholder holder = getviewholderbyviewtype(viewtype);
    return holder;
  }

  private recyclerview.viewholder getviewholderbyviewtype(int viewtype) {

    view tv_itemview = view.inflate(mcontext, r.layout.item_tv, null);
    view iv_itemview = view.inflate(mcontext, r.layout.item_iv, null);

    recyclerview.viewholder holder = null;
    switch (viewtype) {
      case textview_viewtype:
        holder = new mytextview_viewholder(tv_itemview);
        break;
      case imageview_viewtype:
        holder = new myimageview_viewholder(iv_itemview);
        break;
    }
    return holder;
  }

  @override
  public int getitemviewtype(int position) {
    int viewtype = -1;
    int index = position % 2;
    switch (index) {
      case 0:
        viewtype = textview_viewtype;
        break;
      case 1:
        viewtype = imageview_viewtype;
        break;
    }
    return viewtype;
  }

  @override
  public void onbindviewholder(recyclerview.viewholder holder, final int position) {
    if (position % 2 == 0) {
      ((mytextview_viewholder) holder).tv.settext(((string) alllist.get(position)));
      ((mytextview_viewholder) holder).view.setonclicklistener(new view.onclicklistener() {
        @override
        public void onclick(view v) {
          if (monitemclicklistener != null) {
            monitemclicklistener.onitemclick(v, position);
          }
        }
      });

    } else {
      ((myimageview_viewholder) holder).iv.setimageresource(((integer) alllist.get(position)));
      ((myimageview_viewholder) holder).view.setonclicklistener(new view.onclicklistener() {
        @override
        public void onclick(view v) {
          if (monitemclicklistener != null) {
            monitemclicklistener.onitemclick(v, position);
          }
        }
      });
    }
  }

  @override
  public int getitemcount() {
    return alllist.size();
  }

  class mytextview_viewholder extends recyclerview.viewholder {
    public view view;
    public textview tv;

    public mytextview_viewholder(view itemview) {
      super(itemview);
      this.view = itemview;
      this.tv = (textview) itemview.findviewbyid(r.id.tv);
    }
  }

  class myimageview_viewholder extends recyclerview.viewholder {

    public view view;
    public imageview iv;

    public myimageview_viewholder(view itemview) {
      super(itemview);
      this.view = itemview;
      this.iv = (imageview) itemview.findviewbyid(r.id.iv);
    }
  }
}

接着就是我们自定义的divideritemdecoration

package com.example.hfs.recyclerviewloadlayout;

import android.content.context;
import android.content.res.typedarray;
import android.graphics.canvas;
import android.graphics.rect;
import android.graphics.drawable.drawable;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.recyclerview;
import android.view.view;

/**
 * created by hfs on 2016/8/24.
 */
public class divideritemdecoration extends recyclerview.itemdecoration {
  private static final int[] attrs = new int[]{
      android.r.attr.listdivider
  };

  public static final int horizontal_list = linearlayoutmanager.horizontal;

  public static final int vertical_list = linearlayoutmanager.vertical;

  private drawable mdivider;

  private int morientation;

  public divideritemdecoration(context context, int orientation) {
    final typedarray a = context.obtainstyledattributes(attrs);
    mdivider = a.getdrawable(0);
    a.recycle();
    setorientation(orientation);
  }

  public void setorientation(int orientation) {
    if (orientation != horizontal_list && orientation != vertical_list) {
      throw new illegalargumentexception("invalid orientation");
    }
    morientation = orientation;
  }

  @override
  public void ondraw(canvas c, recyclerview parent) {


    if (morientation == vertical_list) {
      drawvertical(c, parent);
    } else {
      drawhorizontal(c, parent);
    }

  }


  public void drawvertical(canvas c, recyclerview parent) {
    final int left = parent.getpaddingleft();
    final int right = parent.getwidth() - parent.getpaddingright();

    final int childcount = parent.getchildcount();
    for (int i = 0; i < childcount; i++) {
      final view child = parent.getchildat(i);
      recyclerview v = new recyclerview(parent.getcontext());
      final recyclerview.layoutparams params = (recyclerview.layoutparams) child
          .getlayoutparams();
      final int top = child.getbottom() + params.bottommargin;
      final int bottom = top + mdivider.getintrinsicheight();
      mdivider.setbounds(left, top, right, bottom);
      mdivider.draw(c);
    }
  }

  public void drawhorizontal(canvas c, recyclerview parent) {
    final int top = parent.getpaddingtop();
    final int bottom = parent.getheight() - parent.getpaddingbottom();

    final int childcount = parent.getchildcount();
    for (int i = 0; i < childcount; i++) {
      final view child = parent.getchildat(i);
      final recyclerview.layoutparams params = (recyclerview.layoutparams) child
          .getlayoutparams();
      final int left = child.getright() + params.rightmargin;
      final int right = left + mdivider.getintrinsicheight();
      mdivider.setbounds(left, top, right, bottom);
      mdivider.draw(c);
    }
  }

  @override
  public void getitemoffsets(rect outrect, int itemposition, recyclerview parent) {
    if (morientation == vertical_list) {
      outrect.set(0, 0, 0, mdivider.getintrinsicheight());
    } else {
      outrect.set(0, 0, mdivider.getintrinsicwidth(), 0);
    }
  }
}

项目地址:https://github.com/greathfs/recyclerviewloadlayout

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移动技术网。

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Android RecyclerView加载不同布局简单实现

2019年07月24日 | 移动技术网IT编程 | 我要评论

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