Android通过网络接口实现数据传递

自定义数据传递请参考链接：

https://blog.csdn.net/weixin_42230348/article/details/103069707

1、导入依赖

导入方式请参考链接：https://blog.csdn.net/weixin_42230348/article/details/103069707

implementation 'com.squareup.retrofit2:retrofit:2.6.2'
implementation 'com.squareup.retrofit2:converter-gson:2.6.2'

2、安装GsonFormat插件：File——>Settings…

3、新建network包，在下面定义一个接口（ApiDemoService）和数据数据实体类(Repo),具体实现如下：

（1）接口（ApiDemoService）

package com.wmc.loginapplication.network;

import java.util.List;

import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Path;

public interface ApiDemoService {

@GET("users/{user}/repos") //拼接地址：https://api.github.com/users/user/repos
Call<List<Repo>> listRepos(@Path("user") String user);

@GET("users/{user}/repos")
Call<List<Repo>> getRepos(@Path("user") String user);
}

（2）需要传递的数据实体Repo：下载接口数据；利用GsonFormat插件转换json数据为实体类

右击空白——>Generate…


再用同样的方式给Repo类添加一个toString（）方法
ps:此处用一分钟的操作完成一个小时的工作，感受网络接口的强大吧~~~~~~

package com.wmc.loginapplication.network;

import com.google.gson.annotations.SerializedName;

public class Repo {

/**
* id : 64619295
* node_id : MDEwOlJlcG9zaXRvcnk2NDYxOTI5NQ==
* name : bitmap-fonts
* full_name : user/bitmap-fonts
* private : false
* owner : {"login":"user","id":14959,"node_id":"MDQ6VXNlcjE0OTU5","avatar_url":"https://avatars2.githubusercontent.com/u/14959?v=4","gravatar_id":"","url":"https://api.github.com/users/user","html_url":"https://github.com/user","followers_url":"https://api.github.com/users/user/followers","following_url":"https://api.github.com/users/user/following{/other_user}","gists_url":"https://api.github.com/users/user/gists{/gist_id}","starred_url":"https://api.github.com/users/user/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/user/subscriptions","organizations_url":"https://api.github.com/users/user/orgs","repos_url":"https://api.github.com/users/user/repos","events_url":"https://api.github.com/users/user/events{/privacy}","received_events_url":"https://api.github.com/users/user/received_events","type":"User","site_admin":false}
* html_url : https://github.com/user/bitmap-fonts
* description : Monospaced bitmap fonts for X11, good for terminal use.
* fork : true
* url : https://api.github.com/repos/user/bitmap-fonts
* forks_url : https://api.github.com/repos/user/bitmap-fonts/forks
* keys_url : https://api.github.com/repos/user/bitmap-fonts/keys{/key_id}
* collaborators_url : https://api.github.com/repos/user/bitmap-fonts/collaborators{/collaborator}
* teams_url : https://api.github.com/repos/user/bitmap-fonts/teams
* hooks_url : https://api.github.com/repos/user/bitmap-fonts/hooks
* issue_events_url : https://api.github.com/repos/user/bitmap-fonts/issues/events{/number}
* events_url : https://api.github.com/repos/user/bitmap-fonts/events
* assignees_url : https://api.github.com/repos/user/bitmap-fonts/assignees{/user}
* branches_url : https://api.github.com/repos/user/bitmap-fonts/branches{/branch}
* tags_url : https://api.github.com/repos/user/bitmap-fonts/tags
* blobs_url : https://api.github.com/repos/user/bitmap-fonts/git/blobs{/sha}
* git_tags_url : https://api.github.com/repos/user/bitmap-fonts/git/tags{/sha}
* git_refs_url : https://api.github.com/repos/user/bitmap-fonts/git/refs{/sha}
* trees_url : https://api.github.com/repos/user/bitmap-fonts/git/trees{/sha}
* statuses_url : https://api.github.com/repos/user/bitmap-fonts/statuses/{sha}
* languages_url : https://api.github.com/repos/user/bitmap-fonts/languages
* stargazers_url : https://api.github.com/repos/user/bitmap-fonts/stargazers
* contributors_url : https://api.github.com/repos/user/bitmap-fonts/contributors
* subscribers_url : https://api.github.com/repos/user/bitmap-fonts/subscribers
* subscription_url : https://api.github.com/repos/user/bitmap-fonts/subscription
* commits_url : https://api.github.com/repos/user/bitmap-fonts/commits{/sha}
* git_commits_url : https://api.github.com/repos/user/bitmap-fonts/git/commits{/sha}
* comments_url : https://api.github.com/repos/user/bitmap-fonts/comments{/number}
* issue_comment_url : https://api.github.com/repos/user/bitmap-fonts/issues/comments{/number}
* contents_url : https://api.github.com/repos/user/bitmap-fonts/contents/{+path}
* compare_url : https://api.github.com/repos/user/bitmap-fonts/compare/{base}...{head}
* merges_url : https://api.github.com/repos/user/bitmap-fonts/merges
* archive_url : https://api.github.com/repos/user/bitmap-fonts/{archive_format}{/ref}
* downloads_url : https://api.github.com/repos/user/bitmap-fonts/downloads
* issues_url : https://api.github.com/repos/user/bitmap-fonts/issues{/number}
* pulls_url : https://api.github.com/repos/user/bitmap-fonts/pulls{/number}
* milestones_url : https://api.github.com/repos/user/bitmap-fonts/milestones{/number}
* notifications_url : https://api.github.com/repos/user/bitmap-fonts/notifications{?since,all,participating}
* labels_url : https://api.github.com/repos/user/bitmap-fonts/labels{/name}
* releases_url : https://api.github.com/repos/user/bitmap-fonts/releases{/id}
* deployments_url : https://api.github.com/repos/user/bitmap-fonts/deployments
* created_at : 2016-07-31T22:40:11Z
* updated_at : 2016-07-31T22:40:23Z
* pushed_at : 2016-03-13T17:25:23Z
* git_url : git://github.com/user/bitmap-fonts.git
* ssh_url : git@github.com:user/bitmap-fonts.git
* clone_url : https://github.com/user/bitmap-fonts.git
* svn_url : https://github.com/user/bitmap-fonts
* homepage : null
* size : 21727
* stargazers_count : 0
* watchers_count : 0
* language : Shell
* has_issues : false
* has_projects : true
* has_downloads : true
* has_wiki : true
* has_pages : false
* forks_count : 0
* mirror_url : null
* archived : false
* disabled : false
* open_issues_count : 0
* license : null
* forks : 0
* open_issues : 0
* watchers : 0
* default_branch : master
*/

private int id;
private String node_id;
private String name;
private String full_name;
@SerializedName("private")
private boolean privateX;
private OwnerBean owner;
private String html_url;
private String description;
private boolean fork;
private String url;
private String forks_url;
private String keys_url;
private String collaborators_url;
private String teams_url;
private String hooks_url;
private String issue_events_url;
private String events_url;
private String assignees_url;
private String branches_url;
private String tags_url;
private String blobs_url;
private String git_tags_url;
private String git_refs_url;
private String trees_url;
private String statuses_url;
private String languages_url;
private String stargazers_url;
private String contributors_url;
private String subscribers_url;
private String subscription_url;
private String commits_url;
private String git_commits_url;
private String comments_url;
private String issue_comment_url;
private String contents_url;
private String compare_url;
private String merges_url;
private String archive_url;
private String downloads_url;
private String issues_url;
private String pulls_url;
private String milestones_url;
private String notifications_url;
private String labels_url;
private String releases_url;
private String deployments_url;
private String created_at;
private String updated_at;
private String pushed_at;
private String git_url;
private String ssh_url;
private String clone_url;
private String svn_url;
private Object homepage;
private int size;
private int stargazers_count;
private int watchers_count;
private String language;
private boolean has_issues;
private boolean has_projects;
private boolean has_downloads;
private boolean has_wiki;
private boolean has_pages;
private int forks_count;
private Object mirror_url;
private boolean archived;
private boolean disabled;
private int open_issues_count;
private Object license;
private int forks;
private int open_issues;
private int watchers;
private String default_branch;

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getNode_id() {
return node_id;
}

public void setNode_id(String node_id) {
this.node_id = node_id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getFull_name() {
return full_name;
}

public void setFull_name(String full_name) {
this.full_name = full_name;
}

public boolean isPrivateX() {
return privateX;
}

public void setPrivateX(boolean privateX) {
this.privateX = privateX;
}

public OwnerBean getOwner() {
return owner;
}

public void setOwner(OwnerBean owner) {
this.owner = owner;
}

public String getHtml_url() {
return html_url;
}

public void setHtml_url(String html_url) {
this.html_url = html_url;
}

public String getDescription() {
return description;
}

public void setDescription(String description) {
this.description = description;
}

public boolean isFork() {
return fork;
}

public void setFork(boolean fork) {
this.fork = fork;
}

public String getUrl() {
return url;
}

public void setUrl(String url) {
this.url = url;
}

public String getForks_url() {
return forks_url;
}

public void setForks_url(String forks_url) {
this.forks_url = forks_url;
}

public String getKeys_url() {
return keys_url;
}

public void setKeys_url(String keys_url) {
this.keys_url = keys_url;
}

public String getCollaborators_url() {
return collaborators_url;
}

public void setCollaborators_url(String collaborators_url) {
this.collaborators_url = collaborators_url;
}

public String getTeams_url() {
return teams_url;
}

public void setTeams_url(String teams_url) {
this.teams_url = teams_url;
}

public String getHooks_url() {
return hooks_url;
}

public void setHooks_url(String hooks_url) {
this.hooks_url = hooks_url;
}

public String getIssue_events_url() {
return issue_events_url;
}

public void setIssue_events_url(String issue_events_url) {
this.issue_events_url = issue_events_url;
}

public String getEvents_url() {
return events_url;
}

public void setEvents_url(String events_url) {
this.events_url = events_url;
}

public String getAssignees_url() {
return assignees_url;
}

public void setAssignees_url(String assignees_url) {
this.assignees_url = assignees_url;
}

public String getBranches_url() {
return branches_url;
}

public void setBranches_url(String branches_url) {
this.branches_url = branches_url;
}

public String getTags_url() {
return tags_url;
}

public void setTags_url(String tags_url) {
this.tags_url = tags_url;
}

public String getBlobs_url() {
return blobs_url;
}

public void setBlobs_url(String blobs_url) {
this.blobs_url = blobs_url;
}

public String getGit_tags_url() {
return git_tags_url;
}

public void setGit_tags_url(String git_tags_url) {
this.git_tags_url = git_tags_url;
}

public String getGit_refs_url() {
return git_refs_url;
}

public void setGit_refs_url(String git_refs_url) {
this.git_refs_url = git_refs_url;
}

public String getTrees_url() {
return trees_url;
}

public void setTrees_url(String trees_url) {
this.trees_url = trees_url;
}

public String getStatuses_url() {
return statuses_url;
}

public void setStatuses_url(String statuses_url) {
this.statuses_url = statuses_url;
}

public String getLanguages_url() {
return languages_url;
}

public void setLanguages_url(String languages_url) {
this.languages_url = languages_url;
}

public String getStargazers_url() {
return stargazers_url;
}

public void setStargazers_url(String stargazers_url) {
this.stargazers_url = stargazers_url;
}

public String getContributors_url() {
return contributors_url;
}

public void setContributors_url(String contributors_url) {
this.contributors_url = contributors_url;
}

public String getSubscribers_url() {
return subscribers_url;
}

public void setSubscribers_url(String subscribers_url) {
this.subscribers_url = subscribers_url;
}

public String getSubscription_url() {
return subscription_url;
}

public void setSubscription_url(String subscription_url) {
this.subscription_url = subscription_url;
}

public String getCommits_url() {
return commits_url;
}

public void setCommits_url(String commits_url) {
this.commits_url = commits_url;
}

public String getGit_commits_url() {
return git_commits_url;
}

public void setGit_commits_url(String git_commits_url) {
this.git_commits_url = git_commits_url;
}

public String getComments_url() {
return comments_url;
}

public void setComments_url(String comments_url) {
this.comments_url = comments_url;
}

public String getIssue_comment_url() {
return issue_comment_url;
}

public void setIssue_comment_url(String issue_comment_url) {
this.issue_comment_url = issue_comment_url;
}

public String getContents_url() {
return contents_url;
}

public void setContents_url(String contents_url) {
this.contents_url = contents_url;
}

public String getCompare_url() {
return compare_url;
}

public void setCompare_url(String compare_url) {
this.compare_url = compare_url;
}

public String getMerges_url() {
return merges_url;
}

public void setMerges_url(String merges_url) {
this.merges_url = merges_url;
}

public String getArchive_url() {
return archive_url;
}

public void setArchive_url(String archive_url) {
this.archive_url = archive_url;
}

public String getDownloads_url() {
return downloads_url;
}

public void setDownloads_url(String downloads_url) {
this.downloads_url = downloads_url;
}

public String getIssues_url() {
return issues_url;
}

public void setIssues_url(String issues_url) {
this.issues_url = issues_url;
}

public String getPulls_url() {
return pulls_url;
}

public void setPulls_url(String pulls_url) {
this.pulls_url = pulls_url;
}

public String getMilestones_url() {
return milestones_url;
}

public void setMilestones_url(String milestones_url) {
this.milestones_url = milestones_url;
}

public String getNotifications_url() {
return notifications_url;
}

public void setNotifications_url(String notifications_url) {
this.notifications_url = notifications_url;
}

public String getLabels_url() {
return labels_url;
}

public void setLabels_url(String labels_url) {
this.labels_url = labels_url;
}

public String getReleases_url() {
return releases_url;
}

public void setReleases_url(String releases_url) {
this.releases_url = releases_url;
}

public String getDeployments_url() {
return deployments_url;
}

public void setDeployments_url(String deployments_url) {
this.deployments_url = deployments_url;
}

public String getCreated_at() {
return created_at;
}

public void setCreated_at(String created_at) {
this.created_at = created_at;
}

public String getUpdated_at() {
return updated_at;
}

public void setUpdated_at(String updated_at) {
this.updated_at = updated_at;
}

public String getPushed_at() {
return pushed_at;
}

public void setPushed_at(String pushed_at) {
this.pushed_at = pushed_at;
}

public String getGit_url() {
return git_url;
}

public void setGit_url(String git_url) {
this.git_url = git_url;
}

public String getSsh_url() {
return ssh_url;
}

public void setSsh_url(String ssh_url) {
this.ssh_url = ssh_url;
}

public String getClone_url() {
return clone_url;
}

public void setClone_url(String clone_url) {
this.clone_url = clone_url;
}

public String getSvn_url() {
return svn_url;
}

public void setSvn_url(String svn_url) {
this.svn_url = svn_url;
}

public Object getHomepage() {
return homepage;
}

public void setHomepage(Object homepage) {
this.homepage = homepage;
}

public int getSize() {
return size;
}

public void setSize(int size) {
this.size = size;
}

public int getStargazers_count() {
return stargazers_count;
}

public void setStargazers_count(int stargazers_count) {
this.stargazers_count = stargazers_count;
}

public int getWatchers_count() {
return watchers_count;
}

public void setWatchers_count(int watchers_count) {
this.watchers_count = watchers_count;
}

public String getLanguage() {
return language;
}

public void setLanguage(String language) {
this.language = language;
}

public boolean isHas_issues() {
return has_issues;
}

public void setHas_issues(boolean has_issues) {
this.has_issues = has_issues;
}

public boolean isHas_projects() {
return has_projects;
}

public void setHas_projects(boolean has_projects) {
this.has_projects = has_projects;
}

public boolean isHas_downloads() {
return has_downloads;
}

public void setHas_downloads(boolean has_downloads) {
this.has_downloads = has_downloads;
}

public boolean isHas_wiki() {
return has_wiki;
}

public void setHas_wiki(boolean has_wiki) {
this.has_wiki = has_wiki;
}

public boolean isHas_pages() {
return has_pages;
}

public void setHas_pages(boolean has_pages) {
this.has_pages = has_pages;
}

public int getForks_count() {
return forks_count;
}

public void setForks_count(int forks_count) {
this.forks_count = forks_count;
}

public Object getMirror_url() {
return mirror_url;
}

public void setMirror_url(Object mirror_url) {
this.mirror_url = mirror_url;
}

public boolean isArchived() {
return archived;
}

public void setArchived(boolean archived) {
this.archived = archived;
}

public boolean isDisabled() {
return disabled;
}

public void setDisabled(boolean disabled) {
this.disabled = disabled;
}

public int getOpen_issues_count() {
return open_issues_count;
}

public void setOpen_issues_count(int open_issues_count) {
this.open_issues_count = open_issues_count;
}

public Object getLicense() {
return license;
}

public void setLicense(Object license) {
this.license = license;
}

public int getForks() {
return forks;
}

public void setForks(int forks) {
this.forks = forks;
}

public int getOpen_issues() {
return open_issues;
}

public void setOpen_issues(int open_issues) {
this.open_issues = open_issues;
}

public int getWatchers() {
return watchers;
}

public void setWatchers(int watchers) {
this.watchers = watchers;
}

public String getDefault_branch() {
return default_branch;
}

public void setDefault_branch(String default_branch) {
this.default_branch = default_branch;
}

public static class OwnerBean {
/**
* login : user
* id : 14959
* node_id : MDQ6VXNlcjE0OTU5
* avatar_url : https://avatars2.githubusercontent.com/u/14959?v=4
* gravatar_id :
* url : https://api.github.com/users/user
* html_url : https://github.com/user
* followers_url : https://api.github.com/users/user/followers
* following_url : https://api.github.com/users/user/following{/other_user}
* gists_url : https://api.github.com/users/user/gists{/gist_id}
* starred_url : https://api.github.com/users/user/starred{/owner}{/repo}
* subscriptions_url : https://api.github.com/users/user/subscriptions
* organizations_url : https://api.github.com/users/user/orgs
* repos_url : https://api.github.com/users/user/repos
* events_url : https://api.github.com/users/user/events{/privacy}
* received_events_url : https://api.github.com/users/user/received_events
* type : User
* site_admin : false
*/

private String login;
private int id;
private String node_id;
private String avatar_url;
private String gravatar_id;
private String url;
private String html_url;
private String followers_url;
private String following_url;
private String gists_url;
private String starred_url;
private String subscriptions_url;
private String organizations_url;
private String repos_url;
private String events_url;
private String received_events_url;
private String type;
private boolean site_admin;

public String getLogin() {
return login;
}

public void setLogin(String login) {
this.login = login;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getNode_id() {
return node_id;
}

public void setNode_id(String node_id) {
this.node_id = node_id;
}

public String getAvatar_url() {
return avatar_url;
}

public void setAvatar_url(String avatar_url) {
this.avatar_url = avatar_url;
}

public String getGravatar_id() {
return gravatar_id;
}

public void setGravatar_id(String gravatar_id) {
this.gravatar_id = gravatar_id;
}

public String getUrl() {
return url;
}

public void setUrl(String url) {
this.url = url;
}

public String getHtml_url() {
return html_url;
}

public void setHtml_url(String html_url) {
this.html_url = html_url;
}

public String getFollowers_url() {
return followers_url;
}

public void setFollowers_url(String followers_url) {
this.followers_url = followers_url;
}

public String getFollowing_url() {
return following_url;
}

public void setFollowing_url(String following_url) {
this.following_url = following_url;
}

public String getGists_url() {
return gists_url;
}

public void setGists_url(String gists_url) {
this.gists_url = gists_url;
}

public String getStarred_url() {
return starred_url;
}

public void setStarred_url(String starred_url) {
this.starred_url = starred_url;
}

public String getSubscriptions_url() {
return subscriptions_url;
}

public void setSubscriptions_url(String subscriptions_url) {
this.subscriptions_url = subscriptions_url;
}

public String getOrganizations_url() {
return organizations_url;
}

public void setOrganizations_url(String organizations_url) {
this.organizations_url = organizations_url;
}

public String getRepos_url() {
return repos_url;
}

public void setRepos_url(String repos_url) {
this.repos_url = repos_url;
}

public String getEvents_url() {
return events_url;
}

public void setEvents_url(String events_url) {
this.events_url = events_url;
}

public String getReceived_events_url() {
return received_events_url;
}

public void setReceived_events_url(String received_events_url) {
this.received_events_url = received_events_url;
}

public String getType() {
return type;
}

public void setType(String type) {
this.type = type;
}

public boolean isSite_admin() {
return site_admin;
}

public void setSite_admin(boolean site_admin) {
this.site_admin = site_admin;
}
}
}

3、因为适配器中的实体为Entity,所以这里要自定义一个实体类

package com.wmc.loginapplication;

import android.os.Parcel;
import android.os.Parcelable;

public class Entity implements Parcelable
{

private int count;

private String msg;

public Entity(int count)
{
this.count = count;
}

public Entity(int count, String msg)
{
this.count = count;
this.msg = msg;
}

public Entity(String msg)
{
this.msg = msg;
}

public int getCount()
{
return count;
}

public void setCount(int count)
{
this.count = count;
}

public String getMsg()
{
return msg;
}

public void setMsg(String msg)
{
this.msg = msg;
}

@Override
public int describeContents() { return 0; }

@Override
public void writeToParcel(Parcel dest, int flags)
{
dest.writeInt(this.count);
dest.writeString(this.msg);
}

protected Entity(Parcel in)
{
this.count = in.readInt();
this.msg = in.readString();
}

public static final Parcelable.Creator<Entity> CREATOR = new Parcelable.Creator<Entity>()
{
@Override
public Entity createFromParcel(Parcel source) {return new Entity(source);}

@Override
public Entity[] newArray(int size) {return new Entity[size];}
};
}

4、主活动相应RefreshActivity相应实现：注释得很详细！认真理解。

package com.wmc.loginapplication;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.util.Log;

import com.scwang.smartrefresh.layout.SmartRefreshLayout;
import com.scwang.smartrefresh.layout.api.RefreshLayout;
import com.scwang.smartrefresh.layout.constant.SpinnerStyle;
import com.scwang.smartrefresh.layout.footer.BallPulseFooter;
import com.scwang.smartrefresh.layout.footer.ClassicsFooter;
import com.scwang.smartrefresh.layout.header.BezierRadarHeader;
import com.scwang.smartrefresh.layout.header.ClassicsHeader;
import com.scwang.smartrefresh.layout.listener.OnLoadMoreListener;
import com.scwang.smartrefresh.layout.listener.OnRefreshListener;
import com.wmc.loginapplication.network.ApiDemoService;
import com.wmc.loginapplication.network.Repo;

import java.util.ArrayList;
import java.util.List;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class RefreshActivity extends AppCompatActivity {

private SmartRefreshLayout refreshLayout ;//刷新布局

private RecyclerView recyclerView ;//列表布局

private RecyclerViewListDemoAdapter adapter ;//适配器

private List<Entity> data ;//要设置的数据
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_refresh);

recyclerView = findViewById(R.id.recyclerView) ;

refreshLayout = findViewById(R.id.refreshLayout);

//设置布局管理器
recyclerView.setLayoutManager(new LinearLayoutManager(this));
//设置适配器
adapter = new RecyclerViewListDemoAdapter(this);
recyclerView.setAdapter(adapter);

//下拉刷新
refreshLayout.setRefreshHeader(new ClassicsHeader(this));
//上拉加载
refreshLayout.setRefreshFooter(new ClassicsFooter(this));
//为下来刷新添加事件
refreshLayout.setOnRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh(RefreshLayout refreshlayout) {
initData();
refreshlayout.finishRefresh(2000/*,false*/);//传入false表示刷新失败
}
});
//为上拉下载添加事件
refreshLayout.setOnLoadMoreListener(new OnLoadMoreListener() {
@Override
public void onLoadMore(RefreshLayout refreshlayout) {
initData();
refreshlayout.finishLoadMore(2000/*,false*/);//传入false表示加载失败
}
});
}

Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://api.github.com/")
.addConverterFactory(GsonConverterFactory.create())//将通过网络地址请求到的json内容添加进来
.build();

ApiDemoService service = retrofit.create(ApiDemoService.class) ;//反射机制实例化ApiDemoService接口
Call<List<Repo>> call = service.listRepos("octocat");//实现接口中的方法

call.enqueue(new Callback<List<Repo>>() {
@Override
public void onResponse(Call<List<Repo>> call, Response<List<Repo>> response) {
Log.e("----response---" , response.toString()) ;

List<Repo> repos = response.body() ;//将网络请求的json数据保存到body

//遍历body区的数据
for(Repo repo:repos)
Entity entity = new Entity(repo.toString()) ;
if(data == null){
data = new ArrayList<>() ;
}
data.add(entity) ;
}
adapter.addData(data);
}

@Override
public void onFailure(Call<List<Repo>> call, Throwable t) {
Log.e("---onFailure---", t.getMessage());
}
});
}
}

5、定义适配器RecyclerViewListDemoAdapter实现数据的配置和展示

package com.wmc.loginapplication;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

//自定义适配器
public class RecyclerViewListDemoAdapter extends RecyclerView.Adapter<RecyclerViewListDemoAdapter.ListViewHolder> {
private List<Entity> data;

private  Context context ;

private RecyclerViewActivity.OnItemClickListener onItemClickListener;

public RecyclerViewListDemoAdapter(Context context)
{
this.context = context;
}

public void setOnItemClickListener(RecyclerViewActivity.OnItemClickListener onItemClickListener)
{
this.onItemClickListener = onItemClickListener;
}

public RecyclerViewListDemoAdapter(List<Entity> data)
{
this.data = data;
}

public void setData(List<Entity> data)
{
this.data = data;
// 刷新数据
notifyDataSetChanged();
}
//为相应逻辑添加数据
public void addData(List<Entity> entities)
{
if (data == null)
{
data = new ArrayList<>();
}
this.data.addAll(entities);
notifyDataSetChanged();
}

/**
*创建一个viewHolder并返回
* @param parent 相当于Item存放的容器
* @param viewType 指定布局文件的类型
* @return 返回viewHolder对象
*/
@NonNull
@Override
public ListViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
//指定对应的布局文件
View view =  LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list_demo,parent,false);
return new ListViewHolder(view);

}

/**
* 将数据加载到布局文件的控件上
* @param holder 需要绑定数据的viewHolder
* @param position 列表数据的下标
*/
@Override
public void onBindViewHolder(@NonNull RecyclerViewListDemoAdapter.ListViewHolder holder, final int position) {
Entity entity = data.get(position);
holder.textView.setText(entity.getMsg());
//将绑定的布局设置点击事件
holder.textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(onItemClickListener!=null){
onItemClickListener.itemClick(position,v);
}
}
});
}
/**
*返回数据的大小
* @return
*/
@Override
public int getItemCount() {
return data == null ? 0 : data.size();
}
//为了系统复用控件
static class ListViewHolder extends RecyclerView.ViewHolder
{
TextView textView;

public ListViewHolder(@NonNull View itemView)
{
super(itemView);
// 实例化该控件
textView = itemView.findViewById(R.id.tv_text);
}
}
}

5、主活动布局activity_refresh和数据布局item_list_demo

<?xml version="1.0" encoding="utf-8"?>
<com.scwang.smartrefresh.layout.SmartRefreshLayout 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"
android:id="@+id/refreshLayout"
tools:context=".RefreshActivity">

<androidx.recyclerview.widget.RecyclerView

android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:overScrollMode="never"
android:background="#fff" />

</com.scwang.smartrefresh.layout.SmartRefreshLayout>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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="wrap_content"
android:orientation="vertical">

<!-- android:lines="5" 每個佈局最多展示5行-->
<TextView
android:id="@+id/tv_text"
android:layout_width="0dp"
android:lines="5"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:padding="30dp"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="TextView"
tools:textColor="@color/colorPrimary"
tools:textSize="30sp" />

<View
android:id="@+id/textView7"
android:layout_width="0dp"
android:layout_height="2dp"
android:layout_marginBottom="4dp"
android:background="#4E0B0B"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tv_text" />

</androidx.constraintlayout.widget.ConstraintLayout>

OK，代码写完！跑起来看看！
大功告成~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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