如何使用

1.build.gradle中添加该类

compile 'com.android.support:recyclerview-v7:28.0.0'

2.视图层中定义RecyclerView

android:id="@+id/rv"

android:layout_width="match_parent"

android:layout_height="match_parent">

3.绑定RecyclerView

RecyclerView rv = findViewById(R.id.rv);

RvAdapter rvAdapter = new RvAdapter(list);

rv.setAdapter(rvAdapter);

// rv.setLayoutManager(new GridLayoutManager(this,4));

rv.setLayoutManager(new

LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));

RecyclerView中有两个必须的设置,setLayoutManager()和setAdapter.

LayoutManager有两种,GridLayoutManager,LinearLayoutManager.

GridLayoutManager使用了2个参数的构造;GridLayoutManager(Context context, int spanCount)

context :上下文

spancout: 每行显示的数量。

LinearLayoutManager使用了3个参数的构造,LinearLayoutManager(Context context, int orientation, boolean reverseLayout)。

context:上下文

orientation:方向,垂直还是水平

reverseLayout：是否倒置,true为倒置

定义Adapter之前创建子视图

activity_item

xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"

android:layout_height="wrap_content">

android:layout_width="match_parent"

android:layout_height="200dp"

android:background="@drawable/border"

>

android:layout_width="100dp"

android:layout_height="100dp"

android:layout_gravity="center"

android:src="@mipmap/ic_launcher"

/>

android:layout_width="250dp"

android:layout_height="100dp"

android:layout_gravity="center"

android:gravity="center"

android:id="@+id/rv_text"

android:background="@drawable/border_blue"

/>

4.定义Adapter

public class RvAdapter extends RecyclerView.Adapter {

private List list;

private MyClickListener myClickListener;

public void setMyClickListener(MyClickListener myClickListener) {

this.myClickListener=myClickListener;

}

public RvAdapter(List list) {

this.list=list;

}

@NonNull

@Override

public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

//绑定子视图

View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.activity_item, viewGroup, false);

MyViewHolder myViewHolder=new MyViewHolder(view);

return myViewHolder;

}

@Override

public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, final int i) {

TextView textView =myViewHolder.itemView.findViewById(R.id.rv_text);

textView.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

myClickListener.setTextClickListener(i);

}

});

textView.setText(list.get(i));

myViewHolder.itemView.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

myClickListener.setOnClickListener(i);

}

});

myViewHolder.itemView.setOnLongClickListener(new View.OnLongClickListener() {

@Override

public boolean onLongClick(View v) {

myClickListener.setOnLongClickListener(i);

return false;

}

});

}

@Override

public int getItemCount() {

return list.size();

}

//定义视图管理器

class MyViewHolder extends RecyclerView.ViewHolder {

public MyViewHolder(@NonNull View itemView) {

super(itemView);

}

}

//事件监听

public interface MyClickListener{

void setOnClickListener(int i);

void setOnLongClickListener(int i);

void setTextClickListener(int i);

}

}

Adapter中重写了三个方法

onCreateViewHolder:用来获取子视图控制器,MyViewHolder继承RecyclerView.ViewHolder类。

onBindViewHolder:用来获取子视图里的控件,第二个参数表示第几个item。

getItemCount():表示页面需要显示的item数量。

RecyclerView只有item的点击事件没有长按事件,使用事件监听给外部暴露长按事件。

rvAdapter.setMyClickListener(new RvAdapter.MyClickListener() {

@Override

public void setOnClickListener(int i) {

Toast.makeText(MainActivity.this,"点击了第 "+ i +"个",Toast.LENGTH_SHORT).show();

}

@Override

public void setOnLongClickListener(int i) {

Toast.makeText(MainActivity.this,"长按了第 "+ i +"个",Toast.LENGTH_SHORT).show();

}

@Override

public void setTextClickListener(int i) {

Toast.makeText(MainActivity.this,"点击了第 "+ i +"个text",Toast.LENGTH_SHORT).show();

}

});

5.效果

效果.gif