XrecylerView上拉加载下拉刷新（包括数据库缓存）（图片使用Fresco加载）

//依赖

  //okhttpClient依赖
    implementation 'com.squareup.okhttp3:okhttp:3.9.0'

//拦截器的依赖
    implementation 'com.squareup.okhttp3:logging-interceptor:3.9.0'
//gson依赖包
    implementation 'com.google.code.gson:gson:2.8.4'

//reclerview的依赖
    implementation 'com.android.support:recyclerview-v7:27.1.1'

    //xRecyclerView的依赖
    implementation 'com.jcodecraeer:xrecyclerview:1.3.2'
    implementation 'com.android.support:design:27.1.1'
//butterknife插件依赖
    implementation 'com.jakewharton:butterknife:8.8.1'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'

//fresco依赖
    implementation 'com.facebook.fresco:fresco:1.9.0'

//使用fresco必须初始化

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

//Main布局

xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    >

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="8"
        >

    android.support.v4.view.ViewPager>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <RadioGroup
            android:id="@+id/main_radio"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:orientation="horizontal">

            <RadioButton
                android:id="@+id/main_home"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:layout_weight="1"
                android:button="@null"
                android:text="推介" />

            <RadioButton
                android:id="@+id/main_cart"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:layout_weight="1"
                android:button="@null"
                android:text="段子" />


        RadioGroup>


    LinearLayout>


LinearLayout>

//MainActivity

public class MainActivity extends AppCompatActivity {

    private List list=new ArrayList<>();
    private ViewPager viewPager;
    private RadioGroup radio;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initViews();
    }

    private void initViews() {

        viewPager = findViewById(R.id.viewpager);
        radio = findViewById(R.id.main_radio);
            list.add(new HomeFragment());
            list.add(new CartFragment());

        MyFragment myFragment = new MyFragment(getSupportFragmentManager(), list);
        viewPager.setAdapter(myFragment);

        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                switch (position){
                    case 0:
                        radio.check(R.id.main_home);
                        break;
                    case 1:
                        radio.check(R.id.main_cart);
                        break;

                }
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

        radio.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId){
                    case R.id.main_home:
                        viewPager.setCurrentItem(0);
                        break;
                    case R.id.main_cart:
                        viewPager.setCurrentItem(1);
                        break;

                }
            }
        });

    }
}

//首页xml

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:background="#0099ff"
        >
        <Button
            android:id="@+id/dian"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:background="@drawable/user_icon"
            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="段子"
            android:gravity="center_horizontal"
            android:layout_marginLeft="110dp"
            android:textColor="#fff"
            />

        <Button
            android:layout_width="80dp"
            android:layout_height="50dp"
            android:background="@drawable/edit_icon"
            android:layout_marginLeft="130dp"
            />
    LinearLayout>


    <com.jcodecraeer.xrecyclerview.XRecyclerView
        android:id="@+id/home_xrecyler"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >
    com.jcodecraeer.xrecyclerview.XRecyclerView>


LinearLayout>

//首页适配器布局

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >

        <com.facebook.drawee.view.SimpleDraweeView
            android:id="@+id/item1_face"
            android:layout_width="50dp"
            android:layout_height="50dp"
            app:roundAsCircle="true"
            android:background="@mipmap/ic_launcher"
            />

        <TextView
            android:id="@+id/item1_tv_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="jinlin"
            android:textColor="#f00"
            android:layout_marginLeft="80dp"
            />

        <TextView
            android:id="@+id/item1_tv_date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="日期"
            android:layout_marginLeft="80dp"
            android:layout_marginTop="30dp"
            />


        <Button
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:background="@drawable/add_icon"
            android:layout_alignParentRight="true"
            />
    RelativeLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >


        <com.facebook.drawee.view.SimpleDraweeView
            android:id="@+id/item1_faso"
            android:layout_width="300dp"
            android:layout_height="100dp"
            android:background="@mipmap/ic_launcher"
            />

    RelativeLayout>




LinearLayout>

//recylerView适配器

public class MyAdapter extends RecyclerView.Adapter {

    private List list;

    public MyAdapter(List list) {
        this.list = list;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        View view = View.inflate(parent.getContext(), R.layout.home_item, null);
        return new MyHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        ((MyHolder)holder).tv_name.setText(list.get(position).getContent());
        ((MyHolder)holder).tv_date.setText(list.get(position).getCreateTime());
        String pic = list.get(position).getUser().getIcon();
        if (!TextUtils.isEmpty(pic)){
            Uri uri = Uri.parse(pic);
            ((MyHolder)holder).face1.setImageURI(uri);
            ((MyHolder)holder).face2.setImageURI(uri);
        }
    }

    @Override
    public int getItemCount() {
        return list == null ? 0 : list.size();
    }

    public class MyHolder extends RecyclerView.ViewHolder {

        private final SimpleDraweeView face1;
        private final TextView tv_name;
        private final TextView tv_date;
        private final SimpleDraweeView face2;

        public MyHolder(View itemView) {
            super(itemView);
            face1 = itemView.findViewById(R.id.item1_face);
            tv_name = itemView.findViewById(R.id.item1_tv_name);
            tv_date = itemView.findViewById(R.id.item1_tv_date);
            face2 = itemView.findViewById(R.id.item1_faso);
        }
    }

}

//首页 fragment

import java.util.List;

public class HomeFragment extends BaseFragment implements HomeView,View.OnClickListener{

    private MyAdapter myAdapter;
    private XRecyclerView xRecyclerView;
    int a=1;
    private DaoSession daoSession;
    private PersonDao personDao;
    private static final String TAG = "HomeFragment****";
    @Override
    protected void initData() {
        presenter.getNet();
    }

    @Override
    protected void initListener() {

    }

    @Override
    protected void initViews(View view) {
        xRecyclerView = view.findViewById(R.id.home_xrecyler);

    }


    @Override
    protected int provId() {
        return R.layout.homefragment;
    }

    @Override
    protected HomePresent provide() {
        return new HomePresent((HomeView) this);
    }


    @Override
    public void onSuccess(HomeBean homeBean) {
        List data = homeBean.getData();
        myAdapter = new MyAdapter(data);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
        xRecyclerView.setLayoutManager(linearLayoutManager);
        xRecyclerView.setAdapter(myAdapter);

        xRecyclerView.setSaveFromParentEnabled(true);
        xRecyclerView.setLoadingMoreEnabled(true);
        xRecyclerView.setLoadingListener(new XRecyclerView.LoadingListener() {
            @Override
            public void onRefresh() {
                a=1;
                initData();
                xRecyclerView.refreshComplete();
            }

            @Override
            public void onLoadMore() {
                a++;
                initData();
                xRecyclerView.refreshComplete();
            }
        });


       daoSession = DaoManager.instance(getContext()).getDaoSession();

        personDao = daoSession.getPersonDao();
        for (int i = 0; i personDao.insert(new Person(null,""+data.get(i).getContent(),data.get(i).getCreateTime()));
        }

    }

    @Override
    public void onFaild(String error) {

    }


    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.dian:
               List list=personDao.queryBuilder()
                       .where(PersonDao.Properties.Id.gt(1))
                       .build()
                       .list();

                Log.d(TAG, "onClick: "+list.get(0).getName1());
                break;
        }
    }
}

//DaoManager

public class DaoManager {

    private final DaoSession daoSession;
    private static DaoManager daoManager;

    private DaoManager(Context context) {
        daoSession = DaoMaster.newDevSession(context, "lo.db");
    }


    public static DaoManager instance(Context context) {
        if (daoManager == null) {
            synchronized (DaoManager.class) {
                if (daoManager == null) {
                    return daoManager = new DaoManager(context);
                }
            }
        }
        return daoManager;
    }


    public DaoSession getDaoSession() {
        return daoSession;
    }

}