MVP+Retrofit+ReJava+Xrecyclerview请求展示数据

港控/mmm° 2022-06-06 09:37 131阅读 0赞

## Retrofit 是一个 RESTful 的 HTTP 网络请求框架的封装 ##

实现的效果：

![Center][]

## 接下来就开始------ ##

## 1.导入依赖: ##

//tablayout
        compile 'com.android.support:design:24.2.1'
        //    logger日志的使用
        compile 'com.orhanobut:logger:2.1.1'
        /*xRecyclerview*/
        compile 'com.jcodecraeer:xrecyclerview:1.3.2'
        //    retrofit2
        compile 'com.squareup.retrofit2:retrofit:2.0.1'
        compile 'com.squareup.retrofit2:converter-gson:2.0.1'
        compile 'com.squareup.retrofit2:adapter-rxjava:2.0.1'
        compile 'io.reactivex:rxandroid:1.1.0'
        compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
    //    imageolader
        compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
    //fresco
        compile 'com.facebook.fresco:fresco:0.14.1'

## 2.添加权限: ##

<uses-permission android:name="android.permission.INTERNET"/>
    
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

## 3.使用fresco加载图片 ##

## 必须得在Application中初始化,并在清单文件中注册AndroidManifest.xml ##

在application内

android:name="view.MyApp"

### MyApp ###

public class MyApp extends Application{
    
        @Override
        public void onCreate() {
            super.onCreate();
            Fresco.initialize(this);//初始化fresco
        }
    }

## 4.主页面布局文件activity\_main.xml ##

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="text.bwie.com.mvphttpdemo1.MainActivity">
    
        
        <com.jcodecraeer.xrecyclerview.XRecyclerView
            android:id="@+id/xRecyclerview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            >
        </com.jcodecraeer.xrecyclerview.XRecyclerView>
    
    </RelativeLayout>

## 子条目布局:news\_item.xml ##

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical" android:layout_width="match_parent"
        android:layout_height="wrap_content">
    
        <LinearLayout
            android:layout_width="match_parent"
            android:orientation="horizontal"
            android:gravity="center_vertical"
            android:layout_height="wrap_content">
            <com.facebook.drawee.view.SimpleDraweeView
                xmlns:fresco="http://schemas.android.com/tools"
                android:id="@+id/news_item_img"
                android:layout_margin="5dp"
                android:layout_width="100dp"
                android:layout_height="100dp"
                fresco:placeholderImage="@mipmap/ic_launcher"
                fresco:placeholderImageScaleType="fitCenter"/>
            <TextView
                android:layout_marginLeft="10dp"
                android:id="@+id/news_item_title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="标题"
                />
        </LinearLayout>
    </LinearLayout>

## 整体文件分包: ##

![Center 1][]

## 5.Api包内: ##

### Api.class ###

public class Api {
    
        public static final String API_URL="https://api.tianapi.com/";
    
    }

### ApiService接口 ###

public interface ApiService {
    
        @GET("/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=0")
        rx.Observable<NewsBean> getWXNews();
    }

## 6.view包内: ##

### Iview接口: ###

public interface Iview {
        //得到请求的数据
        void getHttpJson(NewsBean newsBean);
    }

### DividerItemDecoration为Xrecyclerview的添加分割线 ###

public class DividerItemDecoration extends RecyclerView.ItemDecoration{
        private static final int[] ATTRS = new int[]{
                android.R.attr.listDivider
        };
    
        public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
    
        public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
    
        private Drawable mDivider;
    
        private int mOrientation;
    
        public DividerItemDecoration(Context context, int orientation) {
            final TypedArray a = context.obtainStyledAttributes(ATTRS);
            mDivider = a.getDrawable(0);
            a.recycle();
            setOrientation(orientation);
        }
    
        public void setOrientation(int orientation) {
            if(orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST){
                throw new IllegalArgumentException("invalid orientation");
            }
            mOrientation=orientation;
        }
    
        /*划线*/
        @Override
        public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
            Log.v("main", "onDraw()..");
            if (mOrientation == VERTICAL_LIST) {
                drawVertical(c, parent);
            } else {
                drawHorizontal(c, parent);
            }
        }
    
        private void drawVertical(Canvas c, RecyclerView parent) {
            final int left = parent.getPaddingLeft();
            final int right = parent.getWidth() - parent.getPaddingRight();
    
            final int childCount = parent.getChildCount();
            for (int i = 0; i < childCount; i++) {
                final View child = parent.getChildAt(i);
                RecyclerView v = new RecyclerView(parent.getContext());
                final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                        .getLayoutParams();
                final int top = child.getBottom() + params.bottomMargin;
                final int bottom = top + mDivider.getIntrinsicHeight();
                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(c);
            }
        }
        private void drawHorizontal(Canvas c, RecyclerView parent) {
            final int top = parent.getPaddingTop();
            final int bottom = parent.getHeight() - parent.getPaddingBottom();
    
            final int childCount = parent.getChildCount();
            for (int i = 0; i < childCount; i++) {
                final View child = parent.getChildAt(i);
                final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                        .getLayoutParams();
                final int left = child.getRight() + params.rightMargin;
                final int right = left + mDivider.getIntrinsicHeight();
                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(c);
            }
        }
    
        @Override
        public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
            if (mOrientation == VERTICAL_LIST) {
                outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
            } else {
                outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
            }
        }
    }

## 7.model包内: ##

### IModel接口; ###

public interface IModel {
    
        //请求数据
        void getJson(String url);
    }

### public class HttpModel implements IModel ###

public class HttpModel implements IModel{
    
        private static final String TAG = "main";
        private OnFinish onFinish;
    
        public interface OnFinish{
            void OnFinishListener(NewsBean newsBean);
        }
    
        public void setOnFinish(OnFinish finish){
            this.onFinish=finish;
        }
    
        //网络请求
        @Override
        public void getJson(String url) {
            Retrofit retrofit = new Retrofit.Builder().baseUrl(url)
                    .addConverterFactory(GsonConverterFactory.create())
                    .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                    .build();
            //动态代理得到网络接口
            ApiService apiService = retrofit.create(ApiService.class);
    
            Observable<NewsBean> wxNews = apiService.getWXNews();
            wxNews.subscribeOn(Schedulers.io())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(new Observer<NewsBean>() {
                        @Override
                        public void onCompleted() {
                            Log.d(TAG, "onCompleted:============ ");
                        }
    
                        @Override
                        public void onError(Throwable e) {
                            Log.d(TAG, "onError:============ ");
                        }
    
                        @Override
                        public void onNext(NewsBean newsBean) {
                            Log.d(TAG, "onNext: "+newsBean.getNewslist().get(0).getTitle().toString());
                            //将值传出去
                            onFinish.OnFinishListener(newsBean);
                        }
                    });
        }
    }

## MyRecyclerAdapter适配器: ##

public class MyRecyclerAdapter extends XRecyclerView.Adapter<MyRecyclerAdapter.MyViewHolder>{
        private Context context;
        private NewsBean newsBean;
    
        public MyRecyclerAdapter(Context context, NewsBean newsBean) {
            this.context = context;
            this.newsBean = newsBean;
        }
    
        @Override
        public MyRecyclerAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(context).inflate(R.layout.news_item, parent, false);
            MyViewHolder myViewHolder = new MyViewHolder(view);
            return myViewHolder;
        }
    
        @Override
        public void onBindViewHolder(MyRecyclerAdapter.MyViewHolder holder, int position) {
            holder.title.setText(newsBean.getNewslist().get(position).getTitle());
    	//fresco展示图片
            Uri uri = Uri.parse(newsBean.getNewslist().get(position).getPicUrl());
            holder.img.setImageURI(uri);
        }
    
        @Override
        public int getItemCount() {
            return newsBean.getNewslist().size();
        }
    
        public class MyViewHolder extends XRecyclerView.ViewHolder{
    
            public TextView title;
            public SimpleDraweeView img;
    
            public MyViewHolder(View itemView) {
                super(itemView);
                img = (SimpleDraweeView) itemView.findViewById(R.id.news_item_img);
                title = (TextView) itemView.findViewById(R.id.news_item_title);
            }
        }
    }
    	//fresco展示图片
            Uri uri = Uri.parse(newsBean.getNewslist().get(position).getPicUrl());
            holder.img.setImageURI(uri);
        }
    
        @Override
        public int getItemCount() {
            return newsBean.getNewslist().size();
        }
    
        public class MyViewHolder extends XRecyclerView.ViewHolder{
    
            public TextView title;
            public SimpleDraweeView img;
    
            public MyViewHolder(View itemView) {
                super(itemView);
                img = (SimpleDraweeView) itemView.findViewById(R.id.news_item_img);
                title = (TextView) itemView.findViewById(R.id.news_item_title);
            }
        }
    }

## 8.Presenter包内: ##

### HttpPresenter类: ###

public class HttpPresenter implements HttpModel.OnFinish{
    //定义view和model接口的变量
        private final Iview iview;
        private final HttpModel httpModel;
    
        public HttpPresenter(Iview iview) {
            this.iview = iview;
            this.httpModel =new HttpModel();
            httpModel.setOnFinish(this);
        }
    
        public void setNews(String url){
            httpModel.getJson(url);
        }
    
    
        //完成网络请求后
        @Override
        public void OnFinishListener(NewsBean newsBean) {
            iview.getHttpJson(newsBean);
        }
    }

## 9.最后是MainActivity: ##

public class MainActivity extends AppCompatActivity implements Iview {
        
        XRecyclerView xRecyclerview;
        private MyRecyclerAdapter myRecyclerAdapter;
        private HttpPresenter httpPresenter;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            initView();
        }
    
        private void initView() {
            xRecyclerview = (XRecyclerView) findViewById(R.id.xRecyclerview);
            //线性布局
            xRecyclerview.setLayoutManager(new LinearLayoutManager(this));
            //添加分割线
            xRecyclerview.addItemDecoration(new DividerItemDecoration(MainActivity.this,DividerItemDecoration.VERTICAL_LIST));
    
            httpPresenter = new HttpPresenter(this);
    		httpPresenter.setNews(Api.API_URL); } 
    		//更新数据
    		@Override 
    		public void getHttpJson(NewsBean newsBean) { 
    			myRecyclerAdapter = new MyRecyclerAdapter(this, newsBean); 
    			xRecyclerview.setAdapter(myRecyclerAdapter);
    		}
    	}
    }

完了............

[Center]: /images/20220606/6d9aca752d0c4e6387a698dccba7de8b.png
[Center 1]: /images/20220606/24c46f6e1e88477ea096acd3ccb8bac1.png