Rxjava+Retrofit进行网络请求,并设置相关缓存,只需两个类

XRecyclerView 下拉刷新与上拉加载 请看https://github.com/XRecyclerView/XRecyclerView

第一步先在Module的build.gradle下添加相关依赖

• compile ‘io.reactivex:rxandroid:1.2.1’
• compile ‘com.squareup.retrofit2:retrofit:2.1.0’
• compile ‘com.squareup.retrofit2:converter-gson:2.1.0’
• compile ‘com.squareup.retrofit2:adapter-rxjava:2.1.0’
• compile ‘com.squareup.retrofit2:converter-scalars:2.1.0’

RetrofitService

public interface RetrofitService {
    @GET("data/product/index.php")
Observable<Product> getProduct();
    @GET("data/product/list.php")
    Observable<ProductList> getProductList(@Query("pno") int pageNumber,@Query("pageSize") int pageSize);
}

RetrofitManager

public class RetrofitManager {
    private Context context;
    private  File httpCacheDirectory;
    private  int cacheSize = 10 * 1024 * 1024; // 10 MiB
    private Cache cache;
    private  OkHttpClient client;
    private  Interceptor REWRITE_CACHE_CONTROL_INTERCEPTOR;
    public RetrofitManager(Context context) {
        this.context = context;
        this.httpCacheDirectory=new File(context.getCacheDir(), "responses");
        this.cache = new Cache(httpCacheDirectory, cacheSize);
        this.REWRITE_CACHE_CONTROL_INTERCEPTOR=chain -> {
            CacheControl.Builder cacheBuilder = new CacheControl.Builder();
            cacheBuilder.maxAge(0, TimeUnit.SECONDS);
            cacheBuilder.maxStale(365, TimeUnit.DAYS);
            CacheControl cacheControl = cacheBuilder.build();
            Request request = chain.request();
            if (!NetworkUtils.isAvailable(context)) {
                request = request.newBuilder()
                        .cacheControl(cacheControl)
                        .build();

            }
            Response originalResponse = chain.proceed(request);
            if (NetworkUtils.isAvailable(context)) {
                int maxAge = 0; // read from cache
                return originalResponse.newBuilder()
                        .removeHeader("Pragma")
                        .header("Cache-Control", "public ,max-age=" + maxAge)
                        .build();
            } else {
                int maxStale = 60 * 60 * 24 * 28; // tolerate 4-weeks stale
                return originalResponse.newBuilder()
                        .removeHeader("Pragma")
                        .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
                        .build();
            }
        };
        this.client=new OkHttpClient.Builder()
                .addInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)
                .cache(cache).build();
    }
    /**
     * 配置网络缓存
     */
    public  final String API_BASE_URL = "http://192.168.10.100:80/ajia_code/";
    private  Retrofit.Builder builder =
            new Retrofit.Builder()
                    .baseUrl(API_BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create()).addCallAdapterFactory(RxJavaCallAdapterFactory.create());

    public  <S> S createService(Class<S> serviceClass) {
        Retrofit retrofit = builder.client(client).build();
        return retrofit.create(serviceClass);
    }

    }

NetworkUtils

public class NetworkUtils {

    public static final int NETWORK_NO = -1;   // no network
    public static final int NETWORK_WIFI = 1;    // wifi network
    public static final int NETWORK_2G = 2;    // "2G" networks
    public static final int NETWORK_3G = 3;    // "3G" networks
    public static final int NETWORK_4G = 4;    // "4G" networks
    public static final int NETWORK_UNKNOWN = 5;    // unknown network

    private static final int NETWORK_TYPE_GSM = 16;
    private static final int NETWORK_TYPE_TD_SCDMA = 17;
    private static final int NETWORK_TYPE_IWLAN = 18;

    /**
     * 打开网络设置界面
     * <p>3.0以下打开设置界面</p>
     *
     * @param context 上下文
     */
    public static void openWirelessSettings(Context context) {
        if (android.os.Build.VERSION.SDK_INT > 10) {
            context.startActivity(new Intent(android.provider.Settings.ACTION_SETTINGS));
        } else {
            context.startActivity(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS));
        }
    }

    /**
     * 获取活动网络信息
     *
     * @param context 上下文
     * @return NetworkInfo
     */
    private static NetworkInfo getActiveNetworkInfo(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        return cm.getActiveNetworkInfo();
    }

    /**
     * 判断网络是否可用
     * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
     *
     * @param context 上下文
     * @return {@code true}: 可用<br>{@code false}: 不可用
     */
    public static boolean isAvailable(Context context) {
        NetworkInfo info = getActiveNetworkInfo(context);
        return info != null && info.isAvailable();
    }

    /**
     * 判断网络是否连接
     * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
     *
     * @param context 上下文
     * @return {@code true}: 是<br>{@code false}: 否
     */
    public static boolean isConnected(Context context) {
        NetworkInfo info = getActiveNetworkInfo(context);
        return info != null && info.isConnected();
    }

    /**
     * 判断网络是否是4G
     * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
     *
     * @param context 上下文
     * @return {@code true}: 是<br>{@code false}: 不是
     */
    public static boolean is4G(Context context) {
        NetworkInfo info = getActiveNetworkInfo(context);
        return info != null && info.isAvailable() && info.getSubtype() == TelephonyManager.NETWORK_TYPE_LTE;
    }

    /**
     * 判断wifi是否连接状态
     * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
     *
     * @param context 上下文
     * @return {@code true}: 连接<br>{@code false}: 未连接
     */
    public static boolean isWifiConnected(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        return cm != null && cm.getActiveNetworkInfo() != null
                && cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
    }

    /**
     * 获取移动网络运营商名称
     * <p>如中国联通、中国移动、中国电信</p>
     *
     * @param context 上下文
     * @return 移动网络运营商名称
     */
    public static String getNetworkOperatorName(Context context) {
        TelephonyManager tm = (TelephonyManager) context
                .getSystemService(Context.TELEPHONY_SERVICE);
        return tm != null ? tm.getNetworkOperatorName() : null;
    }

    /**
     * 获取移动终端类型
     *
     * @param context 上下文
     * @return 手机制式
     * <ul>
     * <li>{@link TelephonyManager#PHONE_TYPE_NONE } : 0 手机制式未知</li>
     * <li>{@link TelephonyManager#PHONE_TYPE_GSM  } : 1 手机制式为GSM，移动和联通</li>
     * <li>{@link TelephonyManager#PHONE_TYPE_CDMA } : 2 手机制式为CDMA，电信</li>
     * <li>{@link TelephonyManager#PHONE_TYPE_SIP  } : 3</li>
     * </ul>
     */
    public static int getPhoneType(Context context) {
        TelephonyManager tm = (TelephonyManager) context
                .getSystemService(Context.TELEPHONY_SERVICE);
        return tm != null ? tm.getPhoneType() : -1;
    }

    /**
     * 获取当前的网络类型(WIFI,2G,3G,4G)
     * <p>需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}</p>
     *
     * @param context 上下文
     * @return 网络类型
     * <ul>
     * <li>{@link #NETWORK_WIFI   } = 1;</li>
     * <li>{@link #NETWORK_4G     } = 4;</li>
     * <li>{@link #NETWORK_3G     } = 3;</li>
     * <li>{@link #NETWORK_2G     } = 2;</li>
     * <li>{@link #NETWORK_UNKNOWN} = 5;</li>
     * <li>{@link #NETWORK_NO     } = -1;</li>
     * </ul>
     */
    public static int getNetWorkType(Context context) {
        int netType = NETWORK_NO;
        NetworkInfo info = getActiveNetworkInfo(context);
        if (info != null && info.isAvailable()) {

            if (info.getType() == ConnectivityManager.TYPE_WIFI) {
                netType = NETWORK_WIFI;
            } else if (info.getType() == ConnectivityManager.TYPE_MOBILE) {
                switch (info.getSubtype()) {

                    case NETWORK_TYPE_GSM:
                    case TelephonyManager.NETWORK_TYPE_GPRS:
                    case TelephonyManager.NETWORK_TYPE_CDMA:
                    case TelephonyManager.NETWORK_TYPE_EDGE:
                    case TelephonyManager.NETWORK_TYPE_1xRTT:
                    case TelephonyManager.NETWORK_TYPE_IDEN:
                        netType = NETWORK_2G;
                        break;

                    case NETWORK_TYPE_TD_SCDMA:
                    case TelephonyManager.NETWORK_TYPE_EVDO_A:
                    case TelephonyManager.NETWORK_TYPE_UMTS:
                    case TelephonyManager.NETWORK_TYPE_EVDO_0:
                    case TelephonyManager.NETWORK_TYPE_HSDPA:
                    case TelephonyManager.NETWORK_TYPE_HSUPA:
                    case TelephonyManager.NETWORK_TYPE_HSPA:
                    case TelephonyManager.NETWORK_TYPE_EVDO_B:
                    case TelephonyManager.NETWORK_TYPE_EHRPD:
                    case TelephonyManager.NETWORK_TYPE_HSPAP:
                        netType = NETWORK_3G;
                        break;

                    case NETWORK_TYPE_IWLAN:
                    case TelephonyManager.NETWORK_TYPE_LTE:
                        netType = NETWORK_4G;
                        break;
                    default:

                        String subtypeName = info.getSubtypeName();
                        if (subtypeName.equalsIgnoreCase("TD-SCDMA")
                                || subtypeName.equalsIgnoreCase("WCDMA")
                                || subtypeName.equalsIgnoreCase("CDMA2000")) {
                            netType = NETWORK_3G;
                        } else {
                            netType = NETWORK_UNKNOWN;
                        }
                        break;
                }
            } else {
                netType = NETWORK_UNKNOWN;
            }
        }
        return netType;
    }

    /**
     * 获取当前的网络类型(WIFI,2G,3G,4G)
     * <p>依赖上面的方法</p>
     *
     * @param context 上下文
     * @return 网络类型名称
     * <ul>
     * <li>NETWORK_WIFI   </li>
     * <li>NETWORK_4G     </li>
     * <li>NETWORK_3G     </li>
     * <li>NETWORK_2G     </li>
     * <li>NETWORK_UNKNOWN</li>
     * <li>NETWORK_NO     </li>
     * </ul>
     */
    public static String getNetWorkTypeName(Context context) {
        switch (getNetWorkType(context)) {
            case NETWORK_WIFI:
                return "NETWORK_WIFI";
            case NETWORK_4G:
                return "NETWORK_4G";
            case NETWORK_3G:
                return "NETWORK_3G";
            case NETWORK_2G:
                return "NETWORK_2G";
            case NETWORK_NO:
                return "NETWORK_NO";
            default:
                return "NETWORK_UNKNOWN";
        }
    }
}

下拉刷新与上拉加载 用的我github上已经描述的XRecylerView

网络请求实现分页整体代码如下

public class TestRecylerViewActivity extends AppCompatActivity {
    //初始化组件
    @BindView(R.id.xrlv_recylerview)
    XRecyclerView xrlvRecylerview;
    //第一页
    private int num=1;
    private LinearLayoutManager llm;
    private boolean flag;
    private boolean tag;
    private ListAdapter listAdapter;
    private List<ProductList.DataBean> list;
    /**
     * retrofitService接口
     */
    private  RetrofitService rs;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_recyler_view);
        ButterKnife.bind(this);
        llm=new LinearLayoutManager(this);
        //设置chunzhi垂直布局
        llm.setOrientation(LinearLayoutManager.VERTICAL);
        xrlvRecylerview.setLayoutManager(llm);
        //刷新时间可见
        xrlvRecylerview.getDefaultRefreshHeaderView().setRefreshTimeVisible(true);
        xrlvRecylerview.setRefreshProgressStyle(ProgressStyle.BallSpinFadeLoader);
        xrlvRecylerview.setLoadingMoreProgressStyle(ProgressStyle.SquareSpin);
        //添加横向分割线
       xrlvRecylerview.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
        //创建Retrofit
        rs=new RetrofitManager(this).createService(RetrofitService.class);
        startHttpRequest(num);
      // xrlvRecylerview.setAdapter(listAdapter);
        xrlvRecylerview.setLoadingListener(new XRecyclerView.LoadingListener() {
            @Override
            public void onRefresh() {
                flag=true;
                num=1;
                startHttpRequest(num);
            }

            @Override
            public void onLoadMore() {
                flag=false;
                num++;
                startHttpRequest(num);
            }
        });
    }

    /**
     * 发起网络请求
     * @param pageNumber
     */
    private void startHttpRequest(int pageNumber){
        rs.getProductList(pageNumber,5).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Subscriber<ProductList>() {
            @Override
            public void onCompleted() {

            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onNext(ProductList productList) {
                List<ProductList.DataBean> data = productList.getData();
                if(flag==true){
                    list.clear();
                    list.addAll(0,data);
                    listAdapter.notifyDataSetChanged();
                   // listAdapter=new ListAdapter(list,TestRecylerViewActivity.this);
                   // xrlvRecylerview.setAdapter(listAdapter);
                    xrlvRecylerview.refreshComplete();
                    Log.d("tag1","刷新" +data.size()+" "+listAdapter.getItemCount());
                }else{
                    if(tag==false){
                        list= data;
                        listAdapter=new ListAdapter(list,TestRecylerViewActivity.this);
                        xrlvRecylerview.setAdapter(listAdapter);
                        tag=true;
                        Log.d("tag2","首部加载"+data.size()+" "+listAdapter.getItemCount());


                    }else {
                        list.addAll(data);
                        listAdapter.notifyDataSetChanged();
                        //xrlvRecylerview.setAdapter(new ListAdapter(list,TestRecylerViewActivity.this));
                        xrlvRecylerview.loadMoreComplete();
                        Log.d("tag3","尾部加载"+data.size()+" "+listAdapter.getItemCount());

                    }

                }
            }
        });
    }
}

相关布局

<?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"
    tools:context="com.example.yanruifeng.myapplication.TestRecylerViewActivity">
    <com.jcodecraeer.xrecyclerview.XRecyclerView
        android:id="@+id/xrlv_recylerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></com.jcodecraeer.xrecyclerview.XRecyclerView>
</LinearLayout>

<?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:layout_width="wrap_content"
    android:layout_height="wrap_content" />
    <TextView
        android:layout_toRightOf="@id/tv_title"
        android:id="@+id/tv_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <ImageView
        android:layout_below="@id/tv_price"
        android:id="@+id/iv_pic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</RelativeLayout>

适配器

public class ListAdapter extends RecyclerView.Adapter {
    private List<ProductList.DataBean> list;
    private Context context;

    public ListAdapter(List<ProductList.DataBean> list, Context context) {
        this.list = list;
        this.context = context;
        Log.d("tag",list.size()+"");
    }

    public ListAdapter(){

    }
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view= LayoutInflater.from(context).inflate(R.layout.recylerview_item,parent,false);
        ViewHolder holder=new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        ViewHolder viewHolder= (ViewHolder) holder;
        viewHolder.tvTitle.setText(list.get(position).getTitle());
        viewHolder.tvPrice.setText(list.get(position).getPrice());
        Glide.with(context).load(HttpUrl.IP+"/"+list.get(position).getPic()).into(viewHolder.ivPic);
    }

    @Override
    public int getItemCount() {
        return list==null?0:list.size();
    }
    static  class ViewHolder extends RecyclerView.ViewHolder{
        public TextView tvTitle;
        public TextView tvPrice;
        public ImageView ivPic;
        public ViewHolder(View itemView) {
            super(itemView);
            tvTitle=itemView.findViewById(R.id.tv_title);
            tvPrice=itemView.findViewById(R.id.tv_price);
            ivPic=itemView.findViewById(R.id.iv_pic);
        }
    }
}