先上效果图
Recyclerview是没有点击事件的,所以接口回调就是写的点击事件
需要用到的jar包
implementation 'com.android.support:recyclerview-v7:28.0.0'
android.support.v7.widget.RecyclerView用这个来代替ListView
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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/MyRec"
android:layout_width="match_parent"
android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>
</android.support.constraint.ConstraintLayout>
适配器需要用到的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="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/TV_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="麻辣隔壁" />
</LinearLayout>
主要代码,也是适配器里面的代码
package com.bwie.administrator.jiekouhuidiaolianxi1.adapter;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.bwie.administrator.jiekouhuidiaolianxi1.R;
import java.util.ArrayList;
//此处要继承RecyclerView里面的Adapter类
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> implements View.OnClickListener {
private Context context;
private ArrayList<String> mdatas;
public MyAdapter(Context context, ArrayList<String> mdatas) {
this.context = context;
this.mdatas = mdatas;
}
//创建一个holder类
class ViewHolder extends RecyclerView.ViewHolder {
private TextView MyRec;
public ViewHolder(@NonNull View itemView) {
super(itemView);
//获取xml中的数据进行优化
MyRec = itemView.findViewById(R.id.TV_name);
}
}
@NonNull
@Override//此处相当于BaseAdapter的getView
public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View v = View.inflate(context, R.layout.item, null);
v.setOnClickListener(this);
ViewHolder holder = new ViewHolder(v);
return holder;
}
@Override//
public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
//获取点击页面的下标索引 相当于baseAdapter中给holder类赋值
viewHolder.MyRec.setText(mdatas.get(i));
viewHolder.itemView.setTag(i);
}
@Override//相当于BaseAdapter的getCount
public int getItemCount() {
return mdatas.size();
}
//定义一个点击事件的接口
public interface OnItemClick {
void onItemClick(View view, int position);
}
private OnItemClick onItemClick;
//实现那个接口
public void setOnItemClick(OnItemClick onItemClick) {
this.onItemClick = onItemClick;
}
//进行判断
@Override
public void onClick(View v) {
if (onItemClick != null) {
//此处取出值
onItemClick.onItemClick(v, (int) v.getTag());
}
}
}
mainActivity里面的代码
package com.bwie.administrator.jiekouhuidiaolianxi1;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Toast;
import com.bwie.administrator.jiekouhuidiaolianxi1.adapter.MyAdapter;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ArrayList<String> datas = new ArrayList<>();
private MyAdapter adapter;
private RecyclerView MyRec;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化数据
initData();
//查找控件
initView();
//创建适配器
adapter = new MyAdapter(MainActivity.this,datas);
//设置适配器
MyRec.setAdapter(adapter);
//点击提示
adapter.setOnItemClick(new MyAdapter.OnItemClick() {
@Override
public void onItemClick(View view, int position) {
//点击事件触发后,吐司提示
Toast.makeText(MainActivity.this,datas.get(position),Toast.LENGTH_SHORT).show();
}
});
}
//初始化数据
private void initData() {
for (int i = 1; i <= 20; i++) {
datas.add("我最帅" + i);
}
}
private void initView() {
MyRec = (RecyclerView) findViewById(R.id.MyRec);
//创建一个线性布局管理器
LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this);
MyRec.setLayoutManager(manager);
}
}
以上