Android RecyclerView使用方法解析

1.简介

　　recyclerview是一种新的视图组，目标是为任何基于适配器的视图提供相似的渲染方式。它被作为listview和gridview控件的继承者，在最新的support-v7版本中提供支持。recyclerview架构，提供了一种插拔式的体验，高度的解耦，异常的灵活，通过设置它提供的不同layoutmanager，itemdecoration , itemanimator实现令人瞠目的效果。

总之listview和gridview能做的recyclerview都能做，并且能实现瀑布流效果

2.使用

在build.gradle配置recyclerview的库
compile 'com.android.support:recyclerview-v7:23.3.0'

//设置recyclerview的适配器
adapter = new myrecyclerviewadapter(recyclerviewactivity.this,datas);
recyclerview.setadapter(adapter);
 
//layoutmanager
recyclerview.setlayoutmanager(new linearlayoutmanager(recyclerviewactivity.this, linearlayoutmanager.vertical, false));
// recyclerview.scrolltoposition(datas.size()-1);
 
//添加recyclerview的分割线
recyclerview.additemdecoration(new dividerlistitemdecoration(recyclerviewactivity.this,dividerlistitemdecoration.vertical_list));
 
//设置动画
recyclerview.setitemanimator(new defaultitemanimator());

public class myadapter extends recyclerview.adapter<myadapter.myviewholder> {
 
 private final context context;
 private final arraylist<string> datas;
 
 public myadapter(context context,arraylist<string> datas){
 this.context = context;
 this.datas = datas;
 }
 /**
 * 相当于listview适配器中的getview的创建holder布局
 *
 * @param parent
 * @param viewtype
 * @return
 */
 @override
 public myviewholder oncreateviewholder(viewgroup parent, int viewtype) {
 view view = view.inflate(context, r.layout.item_hello, null);
 return new myviewholder(view);
 }
 
 @override
 public void onbindviewholder(myviewholder holder, int position) {
 holder.tv_text.settext(datas.get(position));
 holder.iv_icon.setbackgroundresource(r.mipmap.ic_launcher);
 
 }
 
 @override
 public int getitemcount() {
 return datas.size();
 }
 
 class myviewholder extends recyclerview.viewholder {
 
 private textview tv_text;
 private imageview iv_icon;
 
 public myviewholder(view itemview) {
  super(itemview);
  tv_text = (textview) itemview.findviewbyid(r.id.tv_text);
  iv_icon = (imageview) itemview.findviewbyid(r.id.iv_icon);
 
 }
 }
}

3.设置listview&gridview&瀑布流类型效果

//设置list类型效果
recyclerview.setlayoutmanager(new linearlayoutmanager(recyclerviewactivity.this,linearlayoutmanager.vertical,false));
 
//设置grid类型效果
recyclerview.setlayoutmanager(new gridlayoutmanager(recyclerviewactivity.this, 2, gridlayoutmanager.vertical, false));
//recyclerview.scrolltoposition(99);
 
//设置瀑布流类型效果
recyclerview.setlayoutmanager(new staggeredgridlayoutmanager(3,staggeredgridlayoutmanager.vertical));

4.分割线

参照网址：

//设置分割线-分割线需要自定义&还可以自定义分割线的样式
//没有提供默认的分割线
recyclerview.additemdecoration(new dividerlistitemdecoration(this, dividerlistitemdecoration.vertical_list));

public class dividerlistitemdecoration 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 dividerlistitemdecoration(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) {
// log.e("recyclerview - itemdecoration", "ondraw()");

 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);
  android.support.v7.widget.recyclerview v = new android.support.v7.widget.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);
 }
 }
}

dividerlistitemdecoration

设置分割线样式：

①application设置

<!-- base application theme. -->
<style name="apptheme" parent="theme.appcompat.light.darkactionbar">
 <!-- customize your theme here. -->
 <item name="colorprimary">@color/colorprimary</item>
 <item name="colorprimarydark">@color/colorprimarydark</item>
 <item name="coloraccent">@color/coloraccent</item>
 <item name="android:listdivider">@drawable/divider_bg</item>
</style>

②在activity中

<activity android:name=".recyclerview.recyclerviewactivity"
 android:theme="@style/listdividertheme"/>


<style name="listdividertheme" parent="theme.appcompat.light.darkactionbar">
 <!-- customize your theme here. -->
 <item name="colorprimary">@color/colorprimary</item>
 <item name="colorprimarydark">@color/colorprimarydark</item>
 <item name="coloraccent">@color/coloraccent</item>
 <item name="android:listdivider">@drawable/divider_bg</item>
</style>

5.自定义设置item的点击事件

recyclerview默认是没有点击事件的，需要自定义点击事件
用到知识点：接口，getlayoutposition()

public class myadapter extends recyclerview.adapter<myadapter.myviewholder>{
 
 private final context context;
 private final arraylist<string> datas;
 
 //设置点击某个item的监听
 public interface onitemclicklistener{
  void onitemclick(view view,int position,string content);
 }
 
 private onitemclicklistener onitemclicklistener;
 public void setonitemclicklistener(onitemclicklistener onitemclicklistener) {
 this.onitemclicklistener = onitemclicklistener;
 }
 
 //设置点击图片
 public interface onimageviewclicklistener{
 void onimageviewclick(view view,int position);
 }
 
 private onimageviewclicklistener onimageviewclicklistener;
 public void setonimageviewclicklistener(onimageviewclicklistener onimageviewclicklistener) {
 this.onimageviewclicklistener = onimageviewclicklistener;
 }
 
 ...................................
 
 class myviewholder extends recyclerview.viewholder {
 
 private textview tv_text;
 private imageview iv_icon;
 
 public myviewholder(view itemview) {
  super(itemview);
  tv_text = (textview) itemview.findviewbyid(r.id.tv_text);
  iv_icon = (imageview) itemview.findviewbyid(r.id.iv_icon);
 
  //设置点击事件
  itemview.setonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view v) {
   if(onitemclicklistener != null){
   onitemclicklistener.onitemclick(v,getlayoutposition(),datas.get(getlayoutposition()));
   }
  }
  });
 
  //设置监听
  iv_icon.setonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view v) {
   if(onimageviewclicklistener != null){
   onimageviewclicklistener.onimageviewclick(v,getlayoutposition());
   }
  }
  });
 }
 }
}

在activity中使用自定义的点击事件

//设置点击item的点击事件
myadapter.setonitemclicklistener(new myadapter.onitemclicklistener() {
 @override
 public void onitemclick(view view, int position, string content) {
 toast.maketext(recyclerviewactivity.this, "content=="+content+",--position=="+position, toast.length_short).show();
 }
});
 
//设置点击某张图片的点击事件
myadapter.setonimageviewclicklistener(new myadapter.onimageviewclicklistener() {
 @override
 public void onimageviewclick(view view, int position) {
 toast.maketext(recyclerviewactivity.this, "position=="+position+",view=="+view.tostring(), toast.length_short).show();
 }
});

6.删除和增加数据

1_在适配器中新增加添加和删除两个方法

public class myadapter extends recyclerview.adapter<myadapter.myviewholder> {
 
 ........................
 
 public void adddata(int position,string content){
 datas.add(position,content);
 notifyiteminserted(position);
 }
 
 public void removedata(int position){
 datas.remove(position);
 notifyitemremoved(position);
 }
}

2_activity中

btn_add.setonclicklistener(new view.onclicklistener() {
 @override
 public void onclick(view v) {
 myadapter.adddata(0,"content netdata");
 //定位到第0个位置
 recyclerview.scrolltoposition(0);
 }
});
 
btn_remove.setonclicklistener(new view.onclicklistener() {
 @override
 public void onclick(view v) {
 myadapter.removedata(0);
 }
});

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。