使用MVP 实现请求数据，Model 路径如下如所示：
image.png
首先使用MVP请求数据
1. 页面布局
activity_main.xml
<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".view.MainActivity">
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="@+id/rlv"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
</android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>
recycler_item.xml
<?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">
<ImageView
android:id="@+id/iv"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_margin="20dp"
android:src="@mipmap/ic_launcher" />
<TextView
android:id="@+id/tv_time"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignTop="@id/iv"
android:layout_margin="10dp"
android:layout_toRightOf="@id/iv"
android:text="@string/app_name" />
<TextView
android:id="@+id/tv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/tv_time"
android:layout_margin="10dp"
android:layout_toRightOf="@id/iv"
android:text="@string/app_name" />
</RelativeLayout>
2. bean包下的数据实体类
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<ResultsBean> results;
public boolean isError() {
return error;
}
public void setError(boolean error) {
this.error = error;
}
public List<ResultsBean> getResults() {
return results;
}
public void setResults(List<ResultsBean> 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;
}
}
}
3. api 包下的（请求数据接口的封装）
RequestInterface.java
public interface RequestInterface {
// http://gank.io/api/data/福利/20/1
String wealUrl = "http://gank.io/api/data/福利/20/";
@GET
Observable<WealBean> setData(@Url String page);
}
RequestManager.java
public class RequestManager {
private static RequestManager mRequestManager;
private static Retrofit retrofit;
private RequestManager() {
initInterface();
}
// 初始化Retrofit 的对象
private void initInterface() {
OkHttpClient client = new OkHttpClient.Builder()
.connectTimeout(5000, TimeUnit.MILLISECONDS)
.readTimeout(5000, TimeUnit.MILLISECONDS)
.writeTimeout(5000, TimeUnit.MILLISECONDS)
.build();
retrofit = new Retrofit.Builder()
.client(client)
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.addConverterFactory(GsonConverterFactory.create())
.baseUrl(RequestInterface.wealUrl)
.build();
}
// 使用单例模式（懒汉式）构建当前类的对象
public static RequestManager getManager() {
if (mRequestManager == null) {
synchronized (RequestManager.class) {
if (mRequestManager == null) {
mRequestManager = new RequestManager();
}
}
}
return mRequestManager;
}
public RequestInterface getRetrofit() {
return retrofit.create(RequestInterface.class);
}
}
4.model 包下的 （model 接口与实现）
WealModel.java
public interface WealModel {
void initData(String page, CallBack callBack);
interface CallBack {
void onSuccess(WealBean bean);
void onFail(String message);
}
}
WealModelIpi.java
public class WealModelIpi implements WealModel {
@Override
public void initData(String page, final CallBack callBack) {
RequestManager.getManager().getRetrofit()
.setData(page)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<WealBean>() {
@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("解析失败");
}
}
@Override
public void onError(Throwable e) {
callBack.onFail(e.getMessage());
}
@Override
public void onComplete() {
}
});
}
}
5.view 包下的（view 接口）
WealView.java
public interface WealView {
void onSuccess(WealBean bean);
void onFail(String message);
}
6.presenter 包下的（presenter 接口与实现）
WealPresenter.java
public interface WealPresenter {
void getData(String page);
}
WealPresenterIpi.java
public class WealPresenterIpi implements WealPresenter {
private WealView mWealView;
private WealModel mWealModel;
public WealPresenterIpi(WealView wealView) {
mWealView = wealView;
mWealModel = new WealModelIpi();
}
@Override
public void getData(String page) {
if (mWealModel != null) {
mWealModel.initData(page, new WealModel.CallBack() {
@Override
public void onSuccess(WealBean bean) {
if (mWealView != null) {
mWealView.onSuccess(bean);
}
}
@Override
public void onFail(String message) {
if (mWealView != null) {
mWealView.onFail(message);
}
}
});
}
}
}
7.UI页面的修改
MainActivity.java
public class MainActivity extends AppCompatActivity implements WealView, SwipeRefreshLayout.OnRefreshListener {
private RecyclerView mRlv;
private SwipeRefreshLayout mSwipeRefreshLayout;
private List<WealBean.ResultsBean> mList;
private int page = 1;
private HomeAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
private void initData() {
WealPresenterIpi wealPresenterIpi = new WealPresenterIpi(this);
wealPresenterIpi.getData(page + "");
}
@Override
public void onSuccess(WealBean bean) {
if (page == 1) {
mList.clear();
Toast.makeText(this, "刷新成功", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "加载成功", Toast.LENGTH_SHORT).show();
}
List<WealBean.ResultsBean> results = bean.getResults();
mList.addAll(results);
mAdapter.setData(mList);
mAdapter.notifyDataSetChanged();
// 设置刷新结束
mSwipeRefreshLayout.setRefreshing(false);
}
@Override
public void onFail(String message) {
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
}
private void initView() {
// 获取控件对象
mRlv = (RecyclerView) findViewById(R.id.rlv);
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
// 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 HomeAdapter(this, mList);
mRlv.setAdapter(mAdapter);
// 加载更多
initLoading();
// 下拉刷新
mSwipeRefreshLayout.setOnRefreshListener(this);
}
private void initLoading() {
// 上拉加载更多
mRlv.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
// 判断是否到达底部
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
// 获取布局管理器对象
RecyclerView.LayoutManager layoutManager = mRlv.getLayoutManager();
if (layoutManager instanceof LinearLayoutManager) {
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
// 找到最后一个可见的条目
int lastVisibleItemPosition = linearLayoutManager.findLastVisibleItemPosition();
// 获取数据的总数量
int itemCount = recyclerView.getAdapter().getItemCount();
if (lastVisibleItemPosition == itemCount - 1) {
// 加载数据
page++;
initData();
}
}
}
}
});
}
@Override
public void onRefresh() {
page = 1;
initData();
}
}
HomeAdapter.java
public class MainActivity extends AppCompatActivity implements WealView, SwipeRefreshLayout.OnRefreshListener {
private RecyclerView mRlv;
private SwipeRefreshLayout mSwipeRefreshLayout;
private List<WealBean.ResultsBean> mList;
private int page = 1;
private HomeAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
private void initData() {
WealPresenterIpi wealPresenterIpi = new WealPresenterIpi(this);
wealPresenterIpi.getData(page + "");
}
@Override
public void onSuccess(WealBean bean) {
if (page == 1) {
mList.clear();
Toast.makeText(this, "刷新成功", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "加载成功", Toast.LENGTH_SHORT).show();
}
List<WealBean.ResultsBean> results = bean.getResults();
mList.addAll(results);
mAdapter.setData(mList);
mAdapter.notifyDataSetChanged();
// 设置刷新结束
mSwipeRefreshLayout.setRefreshing(false);
}
@Override
public void onFail(String message) {
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
}
private void initView() {
// 获取控件对象
mRlv = (RecyclerView) findViewById(R.id.rlv);
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
// 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 HomeAdapter(this, mList);
mRlv.setAdapter(mAdapter);
// 加载更多
initLoading();
// 下拉刷新
mSwipeRefreshLayout.setOnRefreshListener(this);
}
private void initLoading() {
// 上拉加载更多
mRlv.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
// 判断是否到达底部
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
// 获取布局管理器对象
RecyclerView.LayoutManager layoutManager = mRlv.getLayoutManager();
if (layoutManager instanceof LinearLayoutManager) {
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
// 找到最后一个可见的条目
int lastVisibleItemPosition = linearLayoutManager.findLastVisibleItemPosition();
// 获取数据的总数量
int itemCount = recyclerView.getAdapter().getItemCount();
if (lastVisibleItemPosition == itemCount - 1) {
// 加载数据
page++;
initData();
}
}
}
}
});
}
@Override
public void onRefresh() {
page = 1;
initData();
}
}
效果图如下：
SwipeRefreshLayout使用.gif
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