主要就是activity和recycview，recycview和adapter；
主要就是fragment和recycview，recycview和adapter；
1.在build.gradle添加
RecyclerView的依赖，因为RecyclerView不是内置在android系统中的，请注意版本要一致
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
compile 'com.android.support:recyclerview-v7:27.1.1'
}2.在布局中添加RecyclerView组件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {
private List<Fruit> mFruitList;
static class ViewHolder extends RecyclerView.ViewHolder {
View fruitView;
ImageView fruitImage;
TextView fruitName;
public ViewHolder(View view) {
super(view);
fruitView = view;
fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
fruitName = (TextView) 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.fruitView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(), "you clicked view " + fruit.getName(), Toast.LENGTH_SHORT).show();
}
});
holder.fruitView.setOnLongClickListener(
new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(), "你长时间按住了我 " + fruit.getName(), Toast.LENGTH_SHORT).show();
//这里必须返回true，否则有可能引起点击事件混乱，因为优先响应的是长按事件，返回true可以在长按事件响应失败时把该点击事件消化掉，避免出错
return true;
}
}
);
holder.fruitImage.setOnLongClickListener(
new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(), "你长时间按住了我 " + fruit.getName(), Toast.LENGTH_SHORT).show();
return true;
}
}
);
holder.fruitImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = holder.getAdapterPosition();
Fruit fruit = mFruitList.get(position);
Toast.makeText(v.getContext(), "you clicked image " + fruit.getName(), Toast.LENGTH_SHORT).show();
}
});
return holder;
}
//这个方法主要用于适配渲染数据到View中 @Override
public void onBindViewHolder(ViewHolder holder, int position) {
Fruit fruit = mFruitList.get(position);
holder.fruitImage.setImageResource(fruit.getImageId());
holder.fruitName.setText(fruit.getName());
}
//BaseAdapter的getCount方法了，即总共有多少个条目
@Override
public int getItemCount() {
return mFruitList.size();
}
}
4.写一下Bean
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 int getImageId() {
return imageId;
}
}
5.在Activity里面写逻辑
public class MainActivity extends AppCompatActivity {
private List<Fruit> fruitList = new ArrayList<Fruit>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initFruits();
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
// 设置布局管理器
//瀑布流
StaggeredGridLayoutManager layoutManager = new
StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);
/*// 设置布局管理器
//垂直分布和横向分布 LinearLayoutManager.HORIZONTAL VERTICAL
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);*/
recyclerView.setLayoutManager(layoutManager);
FruitAdapter adapter = new FruitAdapter(fruitList);
recyclerView.setAdapter(adapter);
}
private void initFruits() {
for (int i = 0; i < 5; 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);
}
}
private String getRandomLengthName(String name) {
Random random = new Random();
//nextInt 产生一个大于0小于（）内参数的随机数
int length = random.nextInt(20) + 1;
StringBuilder builder = new StringBuilder();
for (int i = 0; i < length; i++) {
builder.append(name);
}
return builder.toString();
}
}
.在Fragment里面写逻辑
<?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:fitsSystemWindows="true"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/collect_recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
第二步：在fragment中定义使用
public class CollectFragment extends Fragment {
private View view;//定义view用来设置fragment的layout
public RecyclerView mCollectRecyclerView;//定义RecyclerView
//定义以goodsentity实体类为对象的数据集合
private ArrayList<GoodsEntity> goodsEntityList = new ArrayList<GoodsEntity>();
//自定义recyclerveiw的适配器
private CollectRecycleAdapter mCollectRecyclerAdapter;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
//获取fragment的layout
view = inflater.inflate(R.layout.collect_page, container, false);
//对recycleview进行配置
initRecyclerView();
//模拟数据
initData();
return view;
}
/**
* TODO 模拟数据
*/
private void initData() {
for (int i=0;i<10;i++){
GoodsEntity goodsEntity=new GoodsEntity();
goodsEntity.setGoodsName("模拟数据"+i);
goodsEntity.setGoodsPrice("100"+i);
goodsEntityList.add(goodsEntity);
}
}
/**
* TODO 对recycleview进行配置
*/
private void initRecyclerView() {
//获取RecyclerView
mCollectRecyclerView=(RecyclerView)view.findViewById(R.id.collect_recyclerView);
//创建adapter
mCollectRecyclerAdapter = new CollectRecycleAdapter(getActivity(), goodsEntityList);
//给RecyclerView设置adapter
mCollectRecyclerView.setAdapter(mCollectRecyclerAdapter);
//设置layoutManager,可以设置显示效果，是线性布局、grid布局，还是瀑布流布局
//参数是：上下文、列表方向（横向还是纵向）、是否倒叙
mCollectRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
//设置item的分割线
mCollectRecyclerView.addItemDecoration(new DividerItemDecoration(getActivity(),DividerItemDecoration.VERTICAL));
//RecyclerView中没有item的监听事件，需要自己在适配器中写一个监听事件的接口。参数根据自定义
mCollectRecyclerAdapter.setOnItemClickListener(new CollectRecycleAdapter.OnItemClickListener() {
@Override
public void OnItemClick(View view, GoodsEntity data) {
//此处进行监听事件的业务处理
Toast.makeText(getActivity(),"我是item",Toast.LENGTH_SHORT).show();
}
});
}
}
第三步设置RecyclerView的适配器
public class CollectRecycleAdapter extends RecyclerView.Adapter<CollectRecycleAdapter.myViewHodler> {
private Context context;
private ArrayList<GoodsEntity> goodsEntityList;
//创建构造函数
public CollectRecycleAdapter(Context context, ArrayList<GoodsEntity> goodsEntityList) {
//将传递过来的数据，赋值给本地变量
this.context = context;//上下文
this.goodsEntityList = goodsEntityList;//实体类数据ArrayList
}
/**
* 创建viewhodler，相当于listview中getview中的创建view和viewhodler
*
* @param parent
* @param viewType
* @return
*/
@Override
public myViewHodler onCreateViewHolder(ViewGroup parent, int viewType) {
//创建自定义布局
View itemView = View.inflate(context, R.layout.item_layout, null);
return new myViewHodler(itemView);
}
/**
* 绑定数据，数据与view绑定
*
* @param holder
* @param position
*/
@Override
public void onBindViewHolder(myViewHodler holder, int position) {
//根据点击位置绑定数据
GoodsEntity data = goodsEntityList.get(position);
// holder.mItemGoodsImg;
holder.mItemGoodsName.setText(data.goodsName);//获取实体类中的name字段并设置
holder.mItemGoodsPrice.setText(data.goodsPrice);//获取实体类中的price字段并设置
}
/**
* 得到总条数
*
* @return
*/
@Override
public int getItemCount() {
return goodsEntityList.size();
}
//自定义viewhodler
class myViewHodler extends RecyclerView.ViewHolder {
private ImageView mItemGoodsImg;
private TextView mItemGoodsName;
private TextView mItemGoodsPrice;
public myViewHodler(View itemView) {
super(itemView);
mItemGoodsImg = (ImageView) itemView.findViewById(R.id.item_goods_img);
mItemGoodsName = (TextView) itemView.findViewById(R.id.item_goods_name);
mItemGoodsPrice = (TextView) itemView.findViewById(R.id.item_goods_price);
//点击事件放在adapter中使用，也可以写个接口在activity中调用
//方法一：在adapter中设置点击事件
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//可以选择直接在本位置直接写业务处理
//Toast.makeText(context,"点击了xxx",Toast.LENGTH_SHORT).show();
//此处回传点击监听事件
if(onItemClickListener!=null){
onItemClickListener.OnItemClick(v, goodsEntityList.get(getLayoutPosition()));
}
}
});
}
}
/**
* 设置item的监听事件的接口
*/
public interface OnItemClickListener {
/**
* 接口中的点击每一项的实现方法，参数自己定义
*
* @param view 点击的item的视图
* @param data 点击的item的数据
*/
public void OnItemClick(View view, GoodsEntity data);
}
//需要外部访问，所以需要设置set方法，方便调用
private OnItemClickListener onItemClickListener;
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
}
自定义实体类简单展示：
public class GoodsEntity implements Serializable {
public String imgPath;//图片地址
public String goodsName;//货物名称
public String goodsPrice;//货物价格
public GoodsEntity() {
}
public GoodsEntity(String imgPath, String goodsName, String goodsPrice) {
this.imgPath = imgPath;
this.goodsName = goodsName;
this.goodsPrice = goodsPrice;
}
public String getImgPath() {
return imgPath;
}
public void setImgPath(String imgPath) {
this.imgPath = imgPath;
}
public String getGoodsName() {
return goodsName;
}
public void setGoodsName(String goodsName) {
this.goodsName = goodsName;
}
public String getGoodsPrice() {
return goodsPrice;
}
public void setGoodsPrice(String goodsPrice) {
this.goodsPrice = goodsPrice;
}
@Override
public String toString() {
return "GoodsEntity{" +
"imgPath='" + imgPath + '\'' +
", goodsName='" + goodsName + '\'' +
", goodsPrice='" + goodsPrice + '\'' +
'}';
}
}
