- 效果展示：在搜索框输入手机号码，点击搜索图标，在RecyclerView中显示查询结果和推荐好友。
- 思路：首先RecyclerView是多type的，也就是说RecyclerView中有不同的item，一个是绿色部分的标题，一个是真正的显示结果：用户的头像，性别，昵称，年龄等信息。
- 步骤：
- 新建一个标题item的layout（layout_search_title_item）和显示用户信息item的laypout（layout_search_content_item）；
<?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">
<TextView
android:id="@+id/tv_title"
android:textColor="@android:color/white"
android:textSize="16sp"
android:background="@color/colorAccent"
android:paddingLeft="15dp"
android:gravity="center_vertical"
android:layout_width="match_parent"
android:layout_height="50dp">
</TextView>
</RelativeLayout><?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="match_parent">
<LinearLayout
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:gravity="center_vertical"
android:orientation="horizontal"
android:background="@android:color/white"
android:layout_width="match_parent"
android:layout_height="80dp">
<!--头像加性别-->
<RelativeLayout
android:layout_width="60dp"
android:layout_height="60dp">
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/circleImageView_item"
android:src="@drawable/ic_launcher2"
android:layout_width="match_parent"
android:layout_height="match_parent">
</de.hdodenhof.circleimageview.CircleImageView>
<ImageView
android:id="@+id/iv_sex"
android:layout_alignParentBottom="true"
android:src="@drawable/img_boy_icon"
android:layout_alignParentRight="true"
android:layout_width="20dp"
android:layout_height="20dp">
</ImageView>
</RelativeLayout>
<!--右边的文字-->
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:layout_marginLeft="10dp"
android:orientation="vertical"
android:layout_height="match_parent">
<!--昵称加年龄-->
<LinearLayout
android:gravity="center_vertical"
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:textStyle="bold"
android:maxLines="1"
android:textColor="@color/colorPrimary"
android:gravity="center_vertical"
android:id="@+id/tv_nickName"
android:text="nickname"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
<TextView
android:id="@+id/tv_age"
android:layout_marginLeft="20dp"
android:text="age"
android:maxLines="1"
android:gravity="center_vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
</LinearLayout>
<!--联系-->
<LinearLayout
android:visibility="gone"
android:orientation="horizontal"
android:id="@+id/ll_contact_info"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/contact_name"
android:text="name"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
<TextView
android:id="@+id/contact_phone"
android:layout_marginLeft="10dp"
android:text="phone"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
</LinearLayout>
<!--文字超过文本框用跑马灯效果-->
<!--设置跑马灯效果无限循环-->
<TextView
android:text="desc"
android:singleLine="true"
android:gravity="center_vertical"
android:id="@+id/tv_desc"
android:marqueeRepeatLimit="marquee_forever"
android:ellipsize="marquee"
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="match_parent">
</TextView>
</LinearLayout>
<ImageView
android:src="@drawable/img_right_arrow"
android:layout_width="30dp"
android:layout_height="30dp">
</ImageView>
</LinearLayout>
</RelativeLayout>布局效果：
- 新建Add_FriendsActivity，并默认有布局，布局文件代码如下：布局中添加了include标签，主要是用于在显示没有结果的时候，显示没有数据的修饰图片。
<?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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".UI.Add_FriendsActivity">
<!--头部-->
<LinearLayout
android:gravity="center_vertical"
android:background="@color/colorPrimary"
android:paddingLeft="15dp"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="50dp">
<ImageView
android:src="@drawable/img_contact_icon"
android:layout_width="25dp"
android:layout_height="wrap_content">
</ImageView>
<TextView
android:gravity="center"
android:text="从通讯录中导入"
android:textColor="@android:color/white"
android:layout_marginLeft="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
</LinearLayout>
<LinearLayout
android:gravity="center"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/phone_num"
android:layout_margin="10dp"
android:inputType="phone"
android:maxLength="11"
android:paddingLeft="5dp"
android:hint="@string/phonenumber_addfriends"
android:background="@drawable/login_edit_bg"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="50dp">
</EditText>
<ImageView
android:id="@+id/iv_search"
android:layout_marginRight="10dp"
android:src="@drawable/img_search"
android:layout_width="50dp"
android:layout_height="30dp">
</ImageView>
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycleview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
</androidx.recyclerview.widget.RecyclerView>
<include layout="@layout/layout_empty_view"
android:id="@+id/empty_data"
android:visibility="gone"
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp">
</include>
</LinearLayout>布局效果:
- 新建一个model的包，在包里新建一个AddFriendModel的类，这个类用于描述item里的所有属性，如果你学过《第一行代码》的话，就是类似于学RecyclerView组件时候的Fruit类。
package model;
/**
* Created By LicaiWen
* To DO:
*/
//这个类类似于Fruit类，包括显示的类型（标题还是内容），标题名字，id，头像，昵称，性别，简介等。
public class AddFriendModel {
//类型,是标题还是内容
private int type;
//标题
private String title;
//内容
private String userId;
private String Photo;
private String nickName;
private int age;
private boolean sex;
private String desc;
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getPhoto() {
return Photo;
}
public void setPhoto(String photo) {
Photo = photo;
}
public String getNickName() {
return nickName;
}
public void setNickName(String nickName) {
this.nickName = nickName;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public boolean isSex() {
return sex;
}
public void setSex(boolean sex) {
this.sex = sex;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
}- 接着是给RecyclerView写一个适配器：新建adapter的包，在里面新建Java类AddFriendAdapter继承RecyclerView.Adapter<recyclerView.holder>.
package com.example.meet.Adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import com.example.meet.R;
import java.util.List;
import de.hdodenhof.circleimageview.CircleImageView;
import helper.GlideHelper;
import model.AddFriendModel;
/**
* Created By LicaiWen
* To DO:
*/
//添加好友，搜索结果的recycleView的适配器
public class AddFriendAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
public static final int TYPE_TITLE=0;
public static final int TYPE_CONTENT=1;
private Context context;
private List<AddFriendModel> mlist;
private LayoutInflater inflater;
private OnClickListener clickListener=null;
//为什么要传入content，因为构造LayoutInflater
//为什么要构造LayoutInflater？因为要加载item布局
public AddFriendAdapter(Context context, List<AddFriendModel> mlist) {
this.context = context;
this.mlist = mlist;
inflater= (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
//用onCreateViewHolder的viewType判断是标题还是内容
//onCreateViewHolder是利用viewHold而的构造函数创建viewHolder的实例并返回
@Override
public RecyclerView.ViewHolder onCreateViewHolder( ViewGroup parent, int viewType) {
if(viewType==TYPE_TITLE){
return new TitleViewHolder(inflater.inflate(R.layout.layout_search_title_item,null));
}else if(viewType==TYPE_CONTENT){
return new ContentViewHolder(inflater.inflate(R.layout.layout_search_content_item,null));
}
return null;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
AddFriendModel addFriendModel=mlist.get(position);
if(addFriendModel.getType()==TYPE_TITLE){
((TitleViewHolder)holder).tv_title.setText(addFriendModel.getTitle());
}else if(addFriendModel.getType()==TYPE_CONTENT){
//设置昵称
((ContentViewHolder)holder).tv_nickName.setText(addFriendModel.getNickName());
//设置性别
((ContentViewHolder)holder).sex.setImageResource(addFriendModel.isSex()?R.drawable.img_boy_icon:R.drawable.img_girl_icon);
//设置头像
GlideHelper.loadUrl(context,addFriendModel.getPhoto(), ((ContentViewHolder)holder).circleImageView);
//设置简介
((ContentViewHolder)holder).desc.setText(addFriendModel.getDesc());
//设置年龄
((ContentViewHolder)holder).age.setText(addFriendModel.getAge()+"岁");
}
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clickListener != null) {
clickListener.onClick(position);
}
}
});
/* setClickListener(new OnClickListener() {
@Override
public void onClick( position) {
if (clickListener != null) {
clickListener.onClick(position);
}
}
});
*/
}
@Override
public int getItemCount() {
return mlist.size();
}
//判断是标题还是内容
@Override
public int getItemViewType(int position) {
return mlist.get(position).getType();
}
//viewHolder是初始化item里的组件的函数
class TitleViewHolder extends RecyclerView.ViewHolder{
private TextView tv_title;
public TitleViewHolder( View itemView) {
super(itemView);
tv_title=itemView.findViewById(R.id.tv_title);
}
}
class ContentViewHolder extends RecyclerView.ViewHolder{
private TextView tv_nickName;
private TextView age;
private CircleImageView circleImageView;
private ImageView sex;
private TextView desc;
public ContentViewHolder( View itemView) {
super(itemView);
tv_nickName=itemView.findViewById(R.id.tv_nickName);
age=itemView.findViewById(R.id.tv_age);
circleImageView=itemView.findViewById(R.id.circleImageView_item);
sex=itemView.findViewById(R.id.iv_sex);
desc=itemView.findViewById(R.id.tv_desc);
}
}
public void setClickListener(OnClickListener listener){
clickListener=listener;
}
public interface OnClickListener{
void onClick (int position);
}
}- 现在到了在Activity中写 控制代码：
package com.example.meet.UI;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.framework.Manager.BmobManager;
import com.example.framework.base.BaseBackActivity;
import com.example.framework.bmob.MyBmobUser;
import com.example.framework.utils.CommonUtils;
import com.example.framework.utils.LogUtils;
import com.example.meet.Adapter.AddFriendAdapter;
import com.example.meet.R;
import java.util.ArrayList;
import java.util.List;
import cn.bmob.v3.exception.BmobException;
import cn.bmob.v3.listener.FindListener;
import model.AddFriendModel;
public class Add_FriendsActivity extends BaseBackActivity implements View.OnClickListener {
private EditText phoneNum;
private ImageView ivSearch;
private RecyclerView recycleview;
private AddFriendAdapter addFriendAdapter;
private List<AddFriendModel> mlist = new ArrayList<>();
private View view_empty;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add__friends);
initView();
}
private void initView() {
phoneNum = (EditText) findViewById(R.id.phone_num);
ivSearch = (ImageView) findViewById(R.id.iv_search);
recycleview = (RecyclerView) findViewById(R.id.recycleview);
ivSearch.setOnClickListener(this);
recycleview.setLayoutManager(new LinearLayoutManager(this));
//每项item的下划线
recycleview.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
addFriendAdapter = new AddFriendAdapter(this, mlist);
recycleview.setAdapter(addFriendAdapter);
view_empty = findViewById(R.id.empty_data);
addFriendAdapter.setClickListener(new AddFriendAdapter.OnClickListener() {
@Override
public void onClick(int position) {
Toast.makeText(Add_FriendsActivity.this, "你点击了item", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.iv_search:
queryByPhone();
// Toast.makeText(this, "已被点击", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
//通过电话查询
private void queryByPhone() {
String mobliePhone = phoneNum.getText().toString().trim();
if (TextUtils.isEmpty(mobliePhone)) {
Toast.makeText(this, "手机号码不能为空", Toast.LENGTH_SHORT).show();
} else {
//过滤自己
String phoneNum = BmobManager.getBmobManagerInstance().getMyBombUser().getMobilePhoneNumber();
if (phoneNum.equals(mobliePhone)) {
Toast.makeText(this, "不能查询自己", Toast.LENGTH_SHORT).show();
return;
}
BmobManager.getBmobManagerInstance().queryMyBmobUserByPhone(mobliePhone, new FindListener<MyBmobUser>() {
@Override
public void done(List<MyBmobUser> list, BmobException e) {
if (e == null) {
if (!CommonUtils.isEmpty(list)) {
// mlist.add(list.get(0));
LogUtils.i(list.get(0).toString());
//在recyclerView显示查找结果和推荐结果
MyBmobUser myBmobUser = (MyBmobUser) list.get(0);
view_empty.setVisibility(View.GONE);
recycleview.setVisibility(View.VISIBLE);
mlist.clear();
addTitle("查询结果");
addContent(myBmobUser);
addFriendAdapter.notifyDataSetChanged();
LogUtils.i("mlist.get(0).toStrig:" + mlist.get(0).toString());
LogUtils.i("size:" + mlist.size() + "");
LogUtils.i("myBmobUser.toString:" + myBmobUser.toString());
//显示推荐好友
pushUser();
} else {
//显示空数据
view_empty.setVisibility(View.VISIBLE);
recycleview.setVisibility(View.GONE);
Toast.makeText(Add_FriendsActivity.this, "没有该用户", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(Add_FriendsActivity.this, "查询失败" + e.toString(), Toast.LENGTH_SHORT).show();
}
}
});
}
}
//用于显示标题
public void addTitle(String title) {
AddFriendModel addFriendModel = new AddFriendModel();
addFriendModel.setType(AddFriendAdapter.TYPE_TITLE);
addFriendModel.setTitle(title);
mlist.add(addFriendModel);
//刷新适配器
// addFriendAdapter.notifyDataSetChanged();
}
//用于显示数据内容
public void addContent(MyBmobUser myBmobUser) {
AddFriendModel addFriendModel = new AddFriendModel();
addFriendModel.setType(AddFriendAdapter.TYPE_CONTENT);
addFriendModel.setUserId(myBmobUser.getObjectId());
addFriendModel.setPhoto(myBmobUser.getPhoto());
addFriendModel.setAge(myBmobUser.getAge());
addFriendModel.setDesc(myBmobUser.getDoc());
addFriendModel.setNickName(myBmobUser.getNickName());
addFriendModel.setSex(myBmobUser.isSex());
mlist.add(addFriendModel);
//刷新适配器
//addFriendAdapter.notifyDataSetChanged();
}
public void pushUser() {
BmobManager.getBmobManagerInstance().queryAllUser(new FindListener<MyBmobUser>() {
@Override
public void done(List<MyBmobUser> list, BmobException e) {
if (e == null) {
if (!CommonUtils.isEmpty(list)) {
addTitle("推荐好友");
int num = list.size() <= 100 ? list.size() : 100;
//不能自己推荐给自己
String phoneNum = BmobManager.getBmobManagerInstance().getMyBombUser().getMobilePhoneNumber();
for (int i = 0; i < num; i++) {
if (phoneNum.equals(list.get(i).getMobilePhoneNumber())) {
//跳过本次循环
continue;
}
addContent(list.get(i));
}
addFriendAdapter.notifyDataSetChanged();
}
} else {
Toast.makeText(Add_FriendsActivity.this, "推荐失败:" + e.toString(), Toast.LENGTH_SHORT).show();
}
}
});
}
}- 最后展示Activity中代码的相关类：
MyBombUser是继承BmobUser，多写了用户的相关属性。
package com.example.framework.bmob;
import cn.bmob.v3.BmobUser;
/**
* Created By LicaiWen
* To DO:
*/
public class MyBmobUser extends BmobUser {
//token属性
//获取token的头像地址
private String tokenPhoto;
//获取token的昵称
private String tokenNickName;
//基本属性
//昵称
private String nickName;
//头像
private String photo;
//其他属性
//性别 true为男，false为女
private boolean sex = true;
//简介
private String doc;
//年龄
private int age = 0;
//生日
private String birthday;
//星座
private String constellation;
//爱好
private String hobby;
//用户id
//private
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
private String status;
public String getTokenPhoto() {
return tokenPhoto;
}
public void setTokenPhoto(String tokenPhoto) {
this.tokenPhoto = tokenPhoto;
}
public String getTokenNickName() {
return tokenNickName;
}
public void setTokenNickName(String tokenNickName) {
this.tokenNickName = tokenNickName;
}
public String getNickName() {
return nickName;
}
public void setNickName(String nickName) {
this.nickName = nickName;
}
public String getPhoto() {
return photo;
}
public void setPhoto(String photo) {
this.photo = photo;
}
public boolean isSex() {
return sex;
}
public void setSex(boolean sex) {
this.sex = sex;
}
public String getDoc() {
return doc;
}
public void setDoc(String doc) {
this.doc = doc;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
public String getConstellation() {
return constellation;
}
public void setConstellation(String constellation) {
this.constellation = constellation;
}
public String getHobby() {
return hobby;
}
public void setHobby(String hobby) {
this.hobby = hobby;
}
@Override
public String toString() {
return "MyBmobUser{" +
"tokenPhoto='" + tokenPhoto + '\'' +
", tokenNickName='" + tokenNickName + '\'' +
", nickName='" + nickName + '\'' +
", photo='" + photo + '\'' +
", sex=" + sex +
", doc='" + doc + '\'' +
", age=" + age +
", birthday='" + birthday + '\'' +
", constellation='" + constellation + '\'' +
", hobby='" + hobby + '\'' +
", status='" + status + '\'' +
'}';
}
}BombManager是MyBombUser的管理类，里面用了单例模式获取实例，和MyBmobUser的如查询等相关方法。
package com.example.framework.Manager;
import android.content.Context;
import android.util.Log;
import com.example.framework.bmob.MyBmobUser;
import com.example.framework.entity.StaticClass;
import com.example.framework.utils.LogUtils;
import java.io.File;
import java.util.List;
import cn.bmob.v3.Bmob;
import cn.bmob.v3.BmobQuery;
import cn.bmob.v3.BmobSMS;
import cn.bmob.v3.BmobUser;
import cn.bmob.v3.datatype.BmobFile;
import cn.bmob.v3.exception.BmobException;
import cn.bmob.v3.listener.FindListener;
import cn.bmob.v3.listener.LogInListener;
import cn.bmob.v3.listener.QueryListener;
import cn.bmob.v3.listener.UpdateListener;
import cn.bmob.v3.listener.UploadFileListener;
import io.rong.imlib.RongIMClient;
import static cn.bmob.v3.BmobUser.signOrLoginByMobilePhone;
/**
* Created By LicaiWen
* To DO:
*/
//bmob管理类
public class BmobManager {
public static final String BMOB_APPID = "8c4aa55ae7076048f72fa40e05945293";
private volatile static BmobManager bmobManager = null;
private BmobManager() {
}
public static BmobManager getBmobManagerInstance() {
if (bmobManager == null) {
synchronized (BmobManager.class) {
if (bmobManager == null) {
bmobManager = new BmobManager();
}
}
}
return bmobManager;
}
public void initBmob(Context context) {
Bmob.initialize(context, BMOB_APPID);
// RongIMClient.init(context,StaticClass.RONGYUN_APPID);
}
//发送验证码
public void sendVerifyNumber(String phone, QueryListener<Integer> listener) {
BmobSMS.requestSMSCode(phone, "", listener);
}
//核对验证码
public void ensureVerifyNumber(String phone, String code, LogInListener<MyBmobUser> listener) {
signOrLoginByMobilePhone(phone, code, listener);
}
//获取登录成功的对象
public MyBmobUser getMyBombUser() {
return BmobUser.getCurrentUser(MyBmobUser.class);
}
public boolean isLogining() {
return BmobUser.isLogin();
}
//用于获取用户第一次填写的昵称和头像，更新用户信息
public void firstUploadPhoto(final String nickName, File storageFile, final UploadPhotoListener listener) {
//获取当前登录的bmob用户
final MyBmobUser myBmobUser = getMyBombUser();
//上传头像文件到bmob
final BmobFile bmobFile = new BmobFile(storageFile);
bmobFile.uploadblock(new UploadFileListener() {
@Override
public void done(BmobException e) {
if (e == null) {
//上传成功
//更新用户信息
myBmobUser.setNickName(nickName);
myBmobUser.setPhoto(bmobFile.getFileUrl());
//更新用户token
myBmobUser.setTokenNickName(nickName);
myBmobUser.setTokenPhoto(bmobFile.getFileUrl());
myBmobUser.update(new UpdateListener() {
@Override
public void done(BmobException e) {
if (e == null) {
//更新成功
listener.uploadDone();
} else {
//更新失败
listener.uploadFail(e);
}
}
});
} else {
//上传失败
listener.uploadFail(e);
}
}
});
}
//根据电话查询用户
public void queryMyBmobUserByPhone(String mobilePhone, FindListener<MyBmobUser> listener) {
queryBase("mobilePhoneNumber", mobilePhone, listener);
// LogUtils.i(mobilePhone);
}
// 查询所有的用户
public void queryAllUser(FindListener<MyBmobUser> listener) {
BmobQuery<MyBmobUser> query = new BmobQuery<>();
query.findObjects(listener);
}
public void queryBase(String key, String value, FindListener<MyBmobUser> listener) {
BmobQuery<MyBmobUser> query = new BmobQuery<>();
query.addWhereEqualTo(key, value);
query.findObjects(listener);
}
//写一个接口处理上传失败和成功；
public interface UploadPhotoListener {
void uploadDone();
void uploadFail(BmobException e);
}
}CommonUtils是判断List是否为空的常用工具类。
package com.example.framework.utils;
import java.util.List;
/**
* Created By LicaiWen
* To DO:
*/
//常用工具类
public class CommonUtils {
public static boolean isEmpty(List list){
if(list!=null&& list.size()>0){
return false;
}else {
return true;
}
}
}
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