Okhttp工具类——缓存图片

package com.example.cache;

import android.content.Context;

import java.io.IOException;

import okhttp3.Cache;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

/**
 * Created by 潘明杰 on 2017/12/26.
 */

public class OKHttpUtils {
    private static OKHttpUtils utils;
    private OkHttpClient client;
    private OKHttpUtils(Context context){
        //缓存代码
        Cache cache = new Cache(context.getCacheDir(),1024*1024*8);
        client = new OkHttpClient.Builder().cache(cache).addNetworkInterceptor(new Interceptor() {
            @Override
            public Response intercept(Chain chain) throws IOException {
                Request request = chain.request();
                Response proceed = chain.proceed(request);
                Response pragma = proceed.newBuilder()
                        .removeHeader("Pragma")
                        .removeHeader("Cache-Control")
                        .addHeader("Cache-Control", "max-age=" + 1000 * 30)
                        .build();
                return pragma;
            }
        }).build();
    }
    public static synchronized OKHttpUtils getInstance(Context context){
        if(utils==null)
            utils = new OKHttpUtils(context);
        return utils;
    }
    public void sendGet(String url,  Callback callback){
        Request request = new Request.Builder().url(url).build();
        Call call = client.newCall(request);
        call.enqueue(callback);
    }
    public void sendPOST(String url, RequestBody body, Callback callback){
        Request request = new Request.Builder().url(url).method("POST",body).build();
        Call call = client.newCall(request);
        call.enqueue(callback);
    }
}

//第二步

            直接用工具类调用

OKHttpUtils.getInstance(MainActivity.this).sendGet(URL, new Callback() {
    @Override
    public void onFailure(Call call, IOException e) {

    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {
        final String string = response.body().string();
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Gson gson = new Gson();
                Bean bean = gson.fromJson(string, Bean.class);
                datas = bean.getData().getDatas();



                RecyAdapter adapter = new RecyAdapter(MainActivity.this,datas);
                LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this);
                manager.setOrientation(LinearLayoutManager.VERTICAL);
                recyciew.setLayoutManager(manager);
                recyciew.setAdapter(adapter);
            }
        });

    }
});