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RecyclerView的简单使用

2019年07月24日  | 移动技术网IT编程  | 我要评论

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recyclerview的功能很强大，本文为大家分享recyclerview的简单使用方法。

效果图：

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="match_parent"
 android:layout_height="match_parent">

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

</linearlayout>

fruit_item.xml：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" 
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_margin="5dp">

 <imageview
  android:id="@+id/fruit_image"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal"/>

 <textview
  android:id="@+id/fruit_name"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="left"
  android:layout_margintop="10dp"/>

</linearlayout>

fruit实体类：

public class fruit {

 private string name;
 private int imageid;

 public fruit(string name, int imageid) {
  this.name = name;
  this.imageid = imageid;
 }

 public string getname() {
  return name;
 }

 public void setname(string name) {
  this.name = name;
 }

 public int getimageid() {
  return imageid;
 }

 public void setimageid(int imageid) {
  this.imageid = imageid;
 }
}

fruitadapter：

public class fruitadapter extends recyclerview.adapter<fruitadapter.viewholder> {

 private list<fruit> mfruitlist;

 static class viewholder extends recyclerview.viewholder{
  imageview fruitimage;
  textview fruitname;
  public viewholder(view view){
   super(view);
   fruitimage = view.findviewbyid(r.id.fruit_image);
   fruitname = view.findviewbyid(r.id.fruit_name);
  }
 }

 public fruitadapter(list<fruit> fruitlist){
  mfruitlist = fruitlist;
 }

 @override
 public viewholder oncreateviewholder(viewgroup parent, int viewtype) {
  view view = layoutinflater.from(parent.getcontext()).inflate(
    r.layout.fruit_item,parent,false);
  final viewholder holder = new viewholder(view);
  holder.fruitimage.setonclicklistener(new view.onclicklistener() {
   @override
   public void onclick(view view) {
    fruit fruit = mfruitlist.get(holder.getadapterposition());
    toast.maketext(view.getcontext(),"you clicked view "+fruit.getname(),toast.length_short).show();
   }
  });
  return holder;
 }

 @override
 public void onbindviewholder(viewholder holder, int position) {
  fruit fruit = mfruitlist.get(position);
  holder.fruitimage.setimageresource(fruit.getimageid());
  holder.fruitname.settext(fruit.getname());
 }

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

}

mainactivity：

public class mainactivity extends appcompatactivity {

 list<fruit> fruitlist = new arraylist<>();

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  initfruit();
  recyclerview recyclerview = (recyclerview) findviewbyid(r.id.recycler_view);
  staggeredgridlayoutmanager manager = new staggeredgridlayoutmanager(3,
    staggeredgridlayoutmanager.vertical);
  recyclerview.setlayoutmanager(manager);
  fruitadapter adapter = new fruitadapter(fruitlist);
  recyclerview.setadapter(adapter);
 }

 public void initfruit(){
  for (int i = 0; i < 2; i++) {
   fruit apple = new fruit(getrandomlengthname("apple"), r.drawable.apple_pic);
   fruitlist.add(apple);
   fruit banana = new fruit(getrandomlengthname("banana"), r.drawable.banana_pic);
   fruitlist.add(banana);
   fruit orange = new fruit(getrandomlengthname("orange"), r.drawable.orange_pic);
   fruitlist.add(orange);
   fruit watermelon = new fruit(getrandomlengthname("watermelon"), r.drawable.watermelon_pic);
   fruitlist.add(watermelon);
   fruit pear = new fruit(getrandomlengthname("pear"), r.drawable.pear_pic);
   fruitlist.add(pear);
   fruit grape = new fruit(getrandomlengthname("grape"), r.drawable.grape_pic);
   fruitlist.add(grape);
   fruit pineapple = new fruit(getrandomlengthname("pineapple"), r.drawable.pineapple_pic);
   fruitlist.add(pineapple);
   fruit strawberry = new fruit(getrandomlengthname("strawberry"), r.drawable.strawberry_pic);
   fruitlist.add(strawberry);
   fruit cherry = new fruit(getrandomlengthname("cherry"), r.drawable.cherry_pic);
   fruitlist.add(cherry);
   fruit mango = new fruit(getrandomlengthname("mango"), r.drawable.mango_pic);
   fruitlist.add(mango);
  }
 }


 public string getrandomlengthname(string name){
  random random = new random();
  int length = random.nextint(20)+1;
  stringbuilder builder = new stringbuilder();
  for(int i = 0; i < length; i++){
   builder.append(name);
  }
  return builder.tostring();
 }

}

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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