Log

2020-03-10 12:40:18.455 4240-4240/? E/obu.taobaounio: Unknown bits set in runtime_flags: 0x8000
2020-03-10 12:40:18.904 4240-4240/? E/AndroidRuntime: FATAL EXCEPTION: main
  Process: com.xiaobu.taobaounion, PID: 4240
  java.lang.NoSuchMethodError: No static method metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; in class Ljava/lang/invoke/LambdaMetafactory; or its super classes (declaration of 'java.lang.invoke.LambdaMetafactory' appears in /apex/com.android.runtime/javalib/core-oj.jar)
    at okhttp3.internal.Util.<clinit>(Util.java:87)
    at okhttp3.internal.Util.skipLeadingAsciiWhitespace(Util.java:321)
    at okhttp3.HttpUrl$Builder.parse(HttpUrl.java:1313)
    at okhttp3.HttpUrl.get(HttpUrl.java:917)
    at retrofit2.Retrofit$Builder.baseUrl(Retrofit.java:492)
    at com.xiaobu.taobaounion.utils.RetrofitManager.<init>(RetrofitManager.java:16)
    at com.xiaobu.taobaounion.utils.RetrofitManager.<clinit>(RetrofitManager.java:7)
    at com.xiaobu.taobaounion.utils.RetrofitManager.getRetrofitInstance(RetrofitManager.java:11)
    at com.xiaobu.taobaounion.presenter.impl.HomePresenterImpl.getCategories(HomePresenterImpl.java:20)
    at com.xiaobu.taobaounion.ui.fragment.HomeFragment.loadData(HomeFragment.java:28)
    at com.xiaobu.taobaounion.base.BaseFragment.onCreateView(BaseFragment.java:20)
    at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2600)
    at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:881)
    at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
    at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
    at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
    at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
    at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
    at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
    at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
    at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManagerImpl.java:2663)
    at androidx.fragment.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManagerImpl.java:2613)
    at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:246)
    at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:542)
    at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:201)
    at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1425)
    at android.app.Activity.performStart(Activity.java:7825)
    at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3294)
    at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221)
    at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201)
    at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
    at android.os.Handler.dispatchMessage(Handler.java:107)
    at android.os.Looper.loop(Looper.java:214)
    at android.app.ActivityThread.main(ActivityThread.java:7356)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

代码

model文件夹

Categories

package com.xiaobu.taobaounion.model.domain;

import java.util.List;

public class Categories {

    /**
     * success : true
     * code : 10000
     * message : 获取分类成功.
     * data : [{"id":9660,"title":"推荐"},{"id":9649,"title":"食品"}]
     */

    private boolean success;
    private int code;
    private String message;
    private List<DataBean> data;

    public boolean isSuccess() {
        return success;
    }

    public void setSuccess(boolean success) {
        this.success = success;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public List<DataBean> getData() {
        return data;
    }

    public void setData(List<DataBean> data) {
        this.data = data;
    }

    public static class DataBean {
        @Override
        public String toString() {
            return "DataBean{" +
                    "id=" + id +
                    ", title='" + title + '\'' +
                    '}';
        }

        /**
         * id : 9660
         * title : 推荐
         */


        private int id;
        private String title;

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }
    }

    @Override
    public String toString() {
        return "Categories{" +
                "success=" + success +
                ", code=" + code +
                ", message='" + message + '\'' +
                ", data=" + data +
                '}';
    }
}

Api

package com.xiaobu.taobaounion.model;

import com.xiaobu.taobaounion.model.domain.Categories;

import retrofit2.Call;
import retrofit2.http.GET;

public interface Api {

    @GET("discovery/categories")
    Call<Categories> getCategories() ;
}

view文件夹

IHomeCallback

package com.xiaobu.taobaounion.view;

import com.xiaobu.taobaounion.model.domain.Categories;

public interface IHomeCallback {

    void onCategoriesLoaded(Categories categories);
}

presenter文件夹

HomePresenterImpl

package com.xiaobu.taobaounion.presenter.impl;

import com.xiaobu.taobaounion.model.Api;
import com.xiaobu.taobaounion.model.domain.Categories;
import com.xiaobu.taobaounion.presenter.IHomePresenter;
import com.xiaobu.taobaounion.utils.LogUtil;
import com.xiaobu.taobaounion.utils.RetrofitManager;
import com.xiaobu.taobaounion.view.IHomeCallback;

import java.net.HttpURLConnection;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;

public class HomePresenterImpl implements IHomePresenter {
    @Override
    public void getCategories() {
        Retrofit retrofit = RetrofitManager.getRetrofitInstance().getRetrofit();
        Api api = retrofit.create(Api.class);
        final Call<Categories> task = api.getCategories();
        task.enqueue(new Callback<Categories>() {
            @Override
            public void onResponse(Call<Categories> call, Response<Categories> response) {
                LogUtil.d(HomePresenterImpl.this,"response.code--->"+response.code());
                if (response.code() == HttpURLConnection.HTTP_OK){
                    Categories categories = response.body();
                    LogUtil.i(HomePresenterImpl.this,"body---->"+categories.toString());
                }
            }

            @Override
            public void onFailure(Call<Categories> call, Throwable t) {

            }
        });
    }

    //注册UI通知接口
    @Override
    public void registerCallback(IHomeCallback callback) {

    }

    //取消UI通知接口
    @Override
    public void unregisterCallback(IHomeCallback callback) {

    }
}

IHomePresenter

package com.xiaobu.taobaounion.presenter;

import com.xiaobu.taobaounion.view.IHomeCallback;

public interface IHomePresenter {

    /**
     * 获取商品分类
     */
    void getCategories();

    void registerCallback(IHomeCallback callback);

    void unregisterCallback(IHomeCallback callback);
}

base文件夹

BaseFrement

package com.xiaobu.taobaounion.base;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public abstract class BaseFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        int resId = getRootViewResId();
        View rootView = inflater.inflate(resId, container, false);
        initPresenter();
        loadData();
        return rootView;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        release();
    }

    protected void release() {
        //释放资源
    }

    protected void initPresenter() {
        //创建presenter
    }

    protected void loadData() {
        //加载数据
    }

    protected abstract int getRootViewResId();
}

fragment文件夹

HomeFragment

package com.xiaobu.taobaounion.ui.fragment;

import com.xiaobu.taobaounion.R;
import com.xiaobu.taobaounion.base.BaseFragment;
import com.xiaobu.taobaounion.model.domain.Categories;
import com.xiaobu.taobaounion.presenter.impl.HomePresenterImpl;
import com.xiaobu.taobaounion.view.IHomeCallback;

public class HomeFragment extends BaseFragment implements IHomeCallback {

    private HomePresenterImpl mHomePresenter;

    @Override
    protected int getRootViewResId() {
        return R.layout.fragment_home;
    }

    @Override
    protected void initPresenter() {
        //创建presenter
        mHomePresenter = new HomePresenterImpl();
        mHomePresenter.registerCallback(this);
    }

    @Override
    protected void loadData() {
        //加载数据
        mHomePresenter.getCategories();
    }

    @Override
    protected void release() {
        //取消回调注册
        if (mHomePresenter != null) {
            mHomePresenter.unregisterCallback(this);
        }
    }

    @Override
    public void onCategoriesLoaded(Categories categories) {

    }
}

utils文件夹

BaseUrlConstant

package com.xiaobu.taobaounion.utils;

public class BaseUrlConstant {
    public static final String BASE_URL = "https://api.sunofbeach.net/shop/api";
}

RetrofitManager

package com.xiaobu.taobaounion.utils;

import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class RetrofitManager {
    private static final RetrofitManager ourInstance = new RetrofitManager();
    private final Retrofit mRetrofit;

    public static RetrofitManager getRetrofitInstance() {
        return ourInstance;
    }

    private RetrofitManager() {
        mRetrofit = new Retrofit.Builder()
                .baseUrl(BaseUrlConstant.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
    }

    public Retrofit getRetrofit(){
        return mRetrofit;
    }
}

LogUtil

package com.xiaobu.taobaounion.utils;

import android.util.Log;

public class LogUtil {

    private static int currentLever = 4;
    private static final int DEBUG_LEVER = 4;
    private static final int INFO_LEVER = 3;
    private static final int WARNING_LEVER = 2;
    private static final int ERROR_LEVER = 1;

    public static void d(Object object, String log) {
        if (currentLever >= DEBUG_LEVER) {
            Log.d(object.getClass().getSimpleName(), log);
        }
    }

    public static void i(Object object, String log) {
        if (currentLever >= INFO_LEVER) {
            Log.i(object.getClass().getSimpleName(), log);
        }
    }

    public static void w(Object object, String log) {
        if (currentLever >= WARNING_LEVER) {
            Log.w(object.getClass().getSimpleName(), log);
        }
    }

    public static void e(Object object, String log) {
        if (currentLever >= ERROR_LEVER) {
            Log.e(object.getClass().getSimpleName(), log);
        }
    }
}