项目包如下图：
image.png
一、首先写好bean、api包（创建接口的实体类，定义接口的实现方法）
WealBean.java
public class WealBean {
/**
* error : false
* results : [{"_id":"5c6a4ae99d212226776d3256","createdAt":"2019-02-18T06:04:25.571Z","desc":"2019-02-18","publishedAt":"2019-02-18T06:05:41.975Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1g0ajj4h6ndj30sg11xdmj.jpg","used":true,"who":"lijinshanmx"},{"_id":"5c6385b39d21225dd7a417ce","createdAt":"2019-02-13T02:49:23.946Z","desc":"2019-02-13","publishedAt":"2019-02-13T02:49:33.16Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1g04lsmmadlj31221vowz7.jpg","used":true,"who":"lijinshanmx"},{"_id":"5c4578db9d212264d4501d40","createdAt":"2019-01-21T07:46:35.304Z","desc":"2019-01-21","publishedAt":"2019-01-21T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqgy1fze94uew3jj30qo10cdka.jpg","used":true,"who":"lijinshanmx"},{"_id":"5c2dabdb9d21226e068debf9","createdAt":"2019-01-03T06:29:47.895Z","desc":"2019-01-03","publishedAt":"2019-01-03T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1fytdr77urlj30sg10najf.jpg","used":true,"who":"lijinshanmx"},{"_id":"5c25db189d21221e8ada8664","createdAt":"2018-12-28T08:13:12.688Z","desc":"2018-12-28","publishedAt":"2018-12-28T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1fymj13tnjmj30r60zf79k.jpg","used":true,"who":"lijinshanmx"},{"_id":"5c12216d9d21223f5a2baea2","createdAt":"2018-12-13T09:07:57.2Z","desc":"2018-12-13","publishedAt":"2018-12-13T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqgy1fy58bi1wlgj30sg10hguu.jpg","used":true,"who":"lijinshanmx"},{"_id":"5bfe1a5b9d2122309624cbb7","createdAt":"2018-11-28T04:32:27.338Z","desc":"2018-11-28","publishedAt":"2018-11-28T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqgy1fxno2dvxusj30sf10nqcm.jpg","used":true,"who":"lijinshanmx"},{"_id":"5bf22fd69d21223ddba8ca25","createdAt":"2018-11-19T03:36:54.950Z","desc":"2018-11-19","publishedAt":"2018-11-19T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqgy1fxd7vcz86nj30qo0ybqc1.jpg","used":true,"who":"lijinshanmx"},{"_id":"5be14edb9d21223dd50660f8","createdAt":"2018-11-06T08:20:43.656Z","desc":"2018-11-06","publishedAt":"2018-11-06T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqgy1fwyf0wr8hhj30ie0nhq6p.jpg","used":true,"who":"lijinshanmx"},{"_id":"5bcd71979d21220315c663fc","createdAt":"2018-10-22T06:43:35.440Z","desc":"2018-10-22","publishedAt":"2018-10-22T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqgy1fwgzx8n1syj30sg15h7ew.jpg","used":true,"who":"lijinshanmx"},{"_id":"5bc434ac9d212279160c4c9e","createdAt":"2018-10-15T06:33:16.497Z","desc":"2018-10-15","publishedAt":"2018-10-15T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1fw8wzdua6rj30sg0yc7gp.jpg","used":true,"who":"lijinshanmx"},{"_id":"5bbb0de09d21226111b86f1c","createdAt":"2018-10-08T07:57:20.978Z","desc":"2018-10-08","publishedAt":"2018-10-08T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1fw0vdlg6xcj30j60mzdk7.jpg","used":true,"who":"lijinshanmx"},{"_id":"5ba206ec9d2122610aba3440","createdAt":"2018-09-19T08:21:00.295Z","desc":"2018-09-19","publishedAt":"2018-09-19T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1fvexaq313uj30qo0wldr4.jpg","used":true,"who":"lijinshanmx"},{"_id":"5b9771a29d212206c1b383d0","createdAt":"2018-09-11T07:41:22.491Z","desc":"2018-09-11","publishedAt":"2018-09-11T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1fv5n6daacqj30sg10f1dw.jpg","used":true,"who":"lijinshanmx"},{"_id":"5b830bba9d2122031f86ee51","createdAt":"2018-08-27T04:21:14.703Z","desc":"2018-08-27","publishedAt":"2018-08-28T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1fuo54a6p0uj30sg0zdqnf.jpg","used":true,"who":"lijinshanmx"},{"_id":"5b7b836c9d212201e982de6e","createdAt":"2018-08-21T11:13:48.989Z","desc":"2018-08-21","publishedAt":"2018-08-21T00:00:00.0Z","source":"web","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1fuh5fsvlqcj30sg10onjk.jpg","used":true,"who":"lijinshanmx"},{"_id":"5b74e9409d21222c52ae4cb4","createdAt":"2018-08-16T11:02:24.289Z","desc":"2018-08-16","publishedAt":"2018-08-16T00:00:00.0Z","source":"api","type":"福利","url":"https://ws1.sinaimg.cn/large/0065oQSqly1fubd0blrbuj30ia0qp0yi.jpg","used":true,"who":"lijinshan"},{"_id":"5b7102749d2122341d563844","createdAt":"2018-08-13T12:00:52.458Z","desc":"2018-08-13","publishedAt":"2018-08-13T00:00:00.0Z","source":"api","type":"福利","url":"https://ww1.sinaimg.cn/large/0065oQSqly1fu7xueh1gbj30hs0uwtgb.jpg","used":true,"who":"lijinshan"},{"_id":"5b6bad449d21226f45755582","createdAt":"2018-08-09T10:56:04.962Z","desc":"2018-08-09","publishedAt":"2018-08-09T00:00:00.0Z","source":"web","type":"福利","url":"https://ww1.sinaimg.cn/large/0065oQSqgy1fu39hosiwoj30j60qyq96.jpg","used":true,"who":"lijinshanmx"},{"_id":"5b67b7fd9d2122195bdbd806","createdAt":"2018-08-06T10:52:45.809Z","desc":"2018-08-06","publishedAt":"2018-08-06T00:00:00.0Z","source":"api","type":"福利","url":"https://ww1.sinaimg.cn/large/0065oQSqly1ftzsj15hgvj30sg15hkbw.jpg","used":true,"who":"lijinshan"}]
*/
private boolean error;
private List results;
public boolean isError() {
return error;
}
public void setError(boolean error) {
this.error = error;
}
public List getResults() {
return results;
}
public void setResults(List results) {
this.results = results;
}
public static class ResultsBean {
/**
* _id : 5c6a4ae99d212226776d3256
* createdAt : 2019-02-18T06:04:25.571Z
* desc : 2019-02-18
* publishedAt : 2019-02-18T06:05:41.975Z
* source : web
* type : 福利
* url : https://ws1.sinaimg.cn/large/0065oQSqly1g0ajj4h6ndj30sg11xdmj.jpg
* used : true
* who : lijinshanmx
*/
private String _id;
private String createdAt;
private String desc;
private String publishedAt;
private String source;
private String type;
private String url;
private boolean used;
private String who;
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
public String getCreatedAt() {
return createdAt;
}
public void setCreatedAt(String createdAt) {
this.createdAt = createdAt;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getPublishedAt() {
return publishedAt;
}
public void setPublishedAt(String publishedAt) {
this.publishedAt = publishedAt;
}
public String getSource() {
return source;
}
public void setSource(String source) {
this.source = source;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public boolean isUsed() {
return used;
}
public void setUsed(boolean used) {
this.used = used;
}
public String getWho() {
return who;
}
public void setWho(String who) {
this.who = who;
}
}
}
MyServer.java
public interface MyServer {
String WealUrl = "http://gank.io/api/data/%E7%A6%8F%E5%88%A9/20/";
@GET()
Observable getData(@Url String page);
}
二、写好MVP（model，view，presenter，callback包）
- MVP的接口
Model.java
public interface Model {
void initData(String page, CallBack callBack);
}
MyView.java
public interface MyView {
void onSuccess(WealBean wealBean);
void onFail(String string);
}
Presenter.java
public interface Presenter {
void setData(String page);
}
CallBack.java
public interface CallBack {
void onSuccess(WealBean wealBean);
void onFail(String string);
}
- M层和P层的实现类
ModelIpi.java
public class ModelIpi implements Model {
@Override
public void initData(String page, final CallBack callBack) {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(MyServer.WealUrl)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.build();
MyServer myServer = retrofit.create(MyServer.class);
Observable observable = myServer.getData(page);
observable.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onNext(WealBean value) {
if (value != null && value.getResults() != null && value.getResults().size() > 0) {
callBack.onSuccess(value);
} else {
callBack.onFail("请求失败");
}
}
@Override
public void onError(Throwable e) {
callBack.onFail(e.getMessage());
}
@Override
public void onComplete() {
}
});
}
}
PresenterIpi.java
public class PresenterIpi implements Presenter, CallBack {
private Model mModel;
private MyView mMyView;
public PresenterIpi(Model model, MyView myView) {
mModel = model;
mMyView = myView;
}
@Override
public void setData(String page) {
if (mModel != null){
mModel.initData(page,this);
}
}
@Override
public void onSuccess(WealBean wealBean) {
if (mMyView!= null){
mMyView.onSuccess(wealBean);
}
}
@Override
public void onFail(String string) {
if (mMyView!=null){
mMyView.onFail(string);
}
}
}
二、写布局
activity_mian.xml（UI页面布局）
recycler_item.xml（适配器中需要的条目布局）
三、实现UI展示效果
MainActivity.java
public class MainActivity extends AppCompatActivity implements MyView {
private RecyclerView mRlv;
private SmartRefreshLayout mRefreshLayout;
private List mList;
int page = 1;
private WealAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
private void initData() {
Presenter presenter = new PresenterIpi(new ModelIpi(), this);
presenter.setData(page + "");
}
private void initView() {
// 获取控件对象
mRlv = (RecyclerView) findViewById(R.id.rlv);
mRefreshLayout = (SmartRefreshLayout) findViewById(R.id.refreshLayout);
// 设置数据源
mList = new ArrayList<>();
// 设置显示方式
mRlv.setLayoutManager(new LinearLayoutManager(this));
// 设置适配器
mAdapter = new WealAdapter(this, mList);
mRlv.setAdapter(mAdapter);
// 下拉刷新，必须刷新完成
mRefreshLayout.setOnRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh(RefreshLayout refreshlayout) {
page = 1;
mList.clear();
if (page == 1) {
initData();
}
refreshlayout.finishRefresh(10000);
}
});
// 上拉加载更多，必须加载完成
mRefreshLayout.setOnLoadmoreListener(new OnLoadmoreListener() {
@Override
public void onLoadmore(RefreshLayout refreshlayout) {
page++;
initData();
refreshlayout.finishLoadmore();
}
});
}
@Override
public void onSuccess(WealBean wealBean) {
// 接受到信息，把数据添加到集合中，并且加载到适配器中并刷新
List results = wealBean.getResults();
mList.addAll(results);
mAdapter.setData(mList);
mAdapter.notifyDataSetChanged();
}
@Override
public void onFail(String string) {
Toast.makeText(this, string, Toast.LENGTH_SHORT).show();
}
}
WealAdapter.java
public class WealAdapter extends RecyclerView.Adapter {
private Context mContext;
private List mData;
public WealAdapter(Context context, List data) {
mContext = context;
mData = data;
}
public void setData(List data) {
mData = data;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View inflate = LayoutInflater.from(mContext).inflate(R.layout.recycler_item, null);
return new ViewHolder(inflate);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
WealBean.ResultsBean resultsBean = mData.get(position);
holder.mName.setText(resultsBean.getDesc());
holder.mTitle.setText(resultsBean.getType());
RequestOptions requestOptions = RequestOptions.circleCropTransform();
Glide.with(mContext).load(resultsBean.getUrl()).apply(requestOptions).into(holder.mIv);
}
@Override
public int getItemCount() {
return mData.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private final ImageView mIv;
private final TextView mName;
private final TextView mTitle;
public ViewHolder(View itemView) {
super(itemView);
mIv = itemView.findViewById(R.id.iv);
mName = itemView.findViewById(R.id.tv_name);
mTitle = itemView.findViewById(R.id.tv_title);
}
}
}
效果图如下：
SmartRefreshLayout使用.gif