Android RecycleView添加head配置封装的实例

android recycleview添加head配置封装的实例

这个是把recycleview的适配器给封装了，直接调用就可以了，还添加了可以添加head头部功能，很赞的，今天记下来，下次直接用 

实例代码：

package com.wwl.android; 
 
import android.support.v7.widget.gridlayoutmanager; 
import android.support.v7.widget.recyclerview; 
import android.support.v7.widget.staggeredgridlayoutmanager; 
import android.view.view; 
import android.view.viewgroup; 
 
import java.util.arraylist; 
 
 
public abstract class baserecycleradapter<t> extends recyclerview.adapter<recyclerview.viewholder> { 
 
  public static final int type_header = 0; 
  public static final int type_normal = 1; 
 
  private arraylist<t> mdatas = new arraylist<>(); 
 
  private view mheaderview; 
 
  private onitemclicklistener mlistener; 
 
  public void setonitemclicklistener(onitemclicklistener li) { 
    mlistener = li; 
  } 
 
  public void setheaderview(view headerview) { 
    mheaderview = headerview; 
    notifyiteminserted(0); 
  } 
 
  public view getheaderview() { 
    return mheaderview; 
  } 
 
  public void adddatas(arraylist<t> datas) { 
    mdatas.addall(datas); 
    notifydatasetchanged(); 
  } 
 
  @override 
  public int getitemviewtype(int position) { 
    if(mheaderview == null) return type_normal; 
    if(position == 0) return type_header; 
    return type_normal; 
  } 
 
  @override 
  public recyclerview.viewholder oncreateviewholder(viewgroup parent, final int viewtype) { 
    if(mheaderview != null && viewtype == type_header) return new holder(mheaderview); 
    return oncreate(parent, viewtype); 
  } 
 
 
  @override 
  public void onbindviewholder(recyclerview.viewholder viewholder, int position) { 
    if(getitemviewtype(position) == type_header) return; 
 
    final int pos = getrealposition(viewholder); 
    final t data = mdatas.get(pos); 
    onbind(viewholder, pos, data); 
 
    if(mlistener != null) { 
      viewholder.itemview.setonclicklistener(new view.onclicklistener() { 
        @override 
        public void onclick(view v) { 
          mlistener.onitemclick(pos, data); 
        } 
      }); 
    } 
  } 
 
  @override 
  public void onattachedtorecyclerview(recyclerview recyclerview) { 
    super.onattachedtorecyclerview(recyclerview); 
 
    recyclerview.layoutmanager manager = recyclerview.getlayoutmanager(); 
    if(manager instanceof gridlayoutmanager) { 
      final gridlayoutmanager gridmanager = ((gridlayoutmanager) manager); 
      gridmanager.setspansizelookup(new gridlayoutmanager.spansizelookup() { 
        @override 
        public int getspansize(int position) { 
          return getitemviewtype(position) == type_header 
              ? gridmanager.getspancount() : 1; 
        } 
      }); 
    } 
  } 
 
  @override 
  public void onviewattachedtowindow(recyclerview.viewholder holder) { 
    super.onviewattachedtowindow(holder); 
    viewgroup.layoutparams lp = holder.itemview.getlayoutparams(); 
    if(lp != null 
        && lp instanceof staggeredgridlayoutmanager.layoutparams 
        && holder.getlayoutposition() == 0) { 
      staggeredgridlayoutmanager.layoutparams p = (staggeredgridlayoutmanager.layoutparams) lp; 
      p.setfullspan(true); 
    } 
  } 
 
  public int getrealposition(recyclerview.viewholder holder) { 
    int position = holder.getlayoutposition(); 
    return mheaderview == null ? position : position - 1; 
  } 
 
  @override 
  public int getitemcount() { 
    return mheaderview == null ? mdatas.size() : mdatas.size() + 1; 
  } 
 
  public abstract recyclerview.viewholder oncreate(viewgroup parent, final int viewtype); 
  public abstract void onbind(recyclerview.viewholder viewholder, int realposition, t data); 
 
  public class holder extends recyclerview.viewholder { 
    public holder(view itemview) { 
      super(itemview); 
    } 
  } 
 
  public interface onitemclicklistener<t> { 
    void onitemclick(int position, t data); 
  } 
} 

  然后在外面自己的适配器中直接继承就可以了

package com.wwl.android; 
 
import android.support.v7.widget.recyclerview; 
import android.view.layoutinflater; 
import android.view.view; 
import android.view.viewgroup; 
import android.widget.textview; 
 
/** 
 * wwl 
 */ 
public class myadapter extends baserecycleradapter<string> { 
 
  @override 
  public recyclerview.viewholder oncreate(viewgroup parent, int viewtype) { 
    view layout = layoutinflater.from(parent.getcontext()).inflate(r.layout.item, parent, false); 
    return new myholder(layout); 
  } 
 
  @override 
  public void onbind(recyclerview.viewholder viewholder, int realposition, string data) { 
    if(viewholder instanceof myholder) { 
      ((myholder) viewholder).text.settext(data); 
    } 
  } 
 
  class myholder extends baserecycleradapter.holder { 
    textview text; 
    public myholder(view itemview) { 
      super(itemview); 
      text = (textview) itemview.findviewbyid(r.id.text); 
    } 
  } 
} 
 

 然后在类中调用，

public class mainactivity extends appcompatactivity { 
 
  private recyclerview mrecyclerview; 
  private recyclerview.layoutmanager mlayoutmanager; 
  private myadapter madapter; 
 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.activity_main); 
 
    mrecyclerview = (recyclerview) findviewbyid(r.id.list); 
//    mlayoutmanager = new linearlayoutmanager(this, linearlayoutmanager.vertical, false); 
    mlayoutmanager = new gridlayoutmanager(this, 2); 
//    mlayoutmanager = new staggeredgridlayoutmanager(2, staggeredgridlayoutmanager.vertical); 
    mrecyclerview.setlayoutmanager(mlayoutmanager); 
    mrecyclerview.setitemanimator(new defaultitemanimator()); 
    mrecyclerview.additemdecoration(new griditemdecoration(this, true)); 
 
    madapter = new myadapter(); 
    mrecyclerview.setadapter(madapter); 
    madapter.adddatas(generatedata()); 
    setheader(mrecyclerview); 
    madapter.setonitemclicklistener(new baserecycleradapter.onitemclicklistener<string>() { 
      @override 
      public void onitemclick(int position, string data) { 
        toast.maketext(mainactivity.this, position + "," + data, toast.length_short).show(); 
      } 
    }); 
  } 
 
  private void setheader(recyclerview view) { 
    view header = layoutinflater.from(this).inflate(r.layout.header, view, false); 
     
    madapter.setheaderview(header); 
  } 
 
  private arraylist<string> generatedata() { 
    arraylist<string> data = new arraylist<string>() { 
      { 
        for(int i=0;i<21;i++) add("数据" + i); 
      } 
    }; 
    return data; 
  } 
   
} 

 这样就ok啦。 

布局文件：

r.layout.activity_main 

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

header.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="wrap_content" 
  android:orientation="vertical"> 
 
  <imageview 
    android:layout_gravity="center_horizontal" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:src="@mipmap/ic_launcher"/> 
 
</linearlayout> 

   item.xml 

<?xml version="1.0" encoding="utf-8"?> 
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:padding="20dp" 
  android:orientation="vertical"> 
 
  <textview 
    android:id="@+id/text" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerinparent="true" 
    android:text="数据"/> 
 
</relativelayout> 

以上就是android recycleview添加head配置封装的实例，如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！