mvp,okhttp,recyclerview

compile 'com.squareup.okhttp3:okhttp:3.9.0'
compile 'com.google.code.gson:gson:2.8.2'
compile 'com.android.support:recyclerview-v7:24.2.1'
compile 'com.github.bumptech.glide:glide:4.0.0'

package com.exbawei.liteli.myfulian;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import com.exbawei.liteli.myfulian.presenter.MusicPresenter;import java.util.List;public class MainActivity extends AppCompatActivity implements MusicConstract.IMusicView {    private RecyclerView rv;    private Myadapter adapter;    private MusicPresenter presenter;    private int begin = 0, size = 10;    boolean tag = false;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        rv = (RecyclerView) findViewById(R.id.rv);        adapter = new Myadapter(MainActivity.this);        rv.setLayoutManager(new LinearLayoutManager(MainActivity.this));           rv.setAdapter(adapter);        presenter = new MusicPresenter(MainActivity.this);        presenter.getData(begin);        Mone();    }    private void Mone() {        rv.addOnScrollListener(new RecyclerView.OnScrollListener() {            @Override            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {                super.onScrollStateChanged(recyclerView, newState);                LinearLayoutManager layoutManager = (LinearLayoutManager) rv.getLayoutManager();                int itemPosition = layoutManager.findLastCompletelyVisibleItemPosition();                int count = layoutManager.getItemCount();                if (tag && itemPosition==count-1) {                    presenter.getData(begin+=size);                }            }            @Override            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {                super.onScrolled(recyclerView, dx, dy);                if (dy > 0) {                    tag = true;                } else {                    tag=false;                }            }        });    }    @Override    public void setData(List<MusicBean.SongListBean> list) {        adapter.add(list);    }}----------------------------model------------------------------------
package com.exbawei.liteli.myfulian.model;



import com.exbawei.liteli.myfulian.MusicBean;
import com.exbawei.liteli.myfulian.MusicConstract;
import com.exbawei.liteli.myfulian.utils.GsonObjectCallback;
import com.exbawei.liteli.myfulian.utils.OkHttp3Utils;

import java.io.IOException;

import okhttp3.Call;



public class MusicModel implements MusicConstract.IMusicModel {

    @Override
    public void getMusicList(int offset, final MusicConstract.IMusicView view) {
        OkHttp3Utils.doGet("http://tingapi.ting.baidu.com/v1/restserver/ting?method=baidu.ting.billboard.billList&type=1&size=10&offset=" + offset, new GsonObjectCallback<MusicBean>() {
            @Override
            public void onUi(MusicBean musicBean) {
                view.setData(musicBean.getSong_list());
            }

            @Override
            public void onFailed(Call call, IOException e) {

            }
        });
    }
}


-----------------------------------presenter---------------------------
package com.exbawei.liteli.myfulian.presenter;


import com.exbawei.liteli.myfulian.MusicConstract;
import com.exbawei.liteli.myfulian.model.MusicModel;



public class MusicPresenter extends MusicConstract.IMusicPresenter {
    private MusicModel model;
    private MusicConstract.IMusicView view;
    public MusicPresenter(MusicConstract.IMusicView view){
        model=new MusicModel();
        this.view=view;
    }
    @Override
    public void getData(int offset) {
        model.getMusicList(offset,view);
    }
}

-----------------------------------utils------------

package com.exbawei.liteli.myfulian.utils;

import android.os.Environment;
import android.os.Handler;

import java.io.File;
import java.util.concurrent.TimeUnit;

import okhttp3.Cache;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;

/**
 * 1. 类的用途 封装OkHttp3的工具类 用单例设计模式
 * 2. @author forever
 * 3. @date 2017/9/6 09:19
 */

public class OkHttp3Utils {
    /**
     * 懒汉 安全 加同步
     * 私有的静态成员变量 只声明不创建
     * 私有的构造方法
     * 提供返回实例的静态方法
     */
    private static OkHttp3Utils okHttp3Utils = null;

    private OkHttp3Utils() {
    }

    public static OkHttp3Utils getInstance() {
        if (okHttp3Utils == null) {
            //加同步安全
            synchronized (OkHttp3Utils.class) {
                if (okHttp3Utils == null) {
                    okHttp3Utils = new OkHttp3Utils();
                }
            }

        }

        return okHttp3Utils;
    }

    private static OkHttpClient okHttpClient = null;

    public synchronized static OkHttpClient getOkHttpClient() {
        if (okHttpClient == null) {
            File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");
            int cacheSize = 10 * 1024 * 1024;
            //拦截器
            LoggingInterceptor interceptor=new LoggingInterceptor();

            okHttpClient = new OkHttpClient.Builder().connectTimeout(15, TimeUnit.SECONDS)
                    //添加OkHttp3的拦截器
                    .addInterceptor(interceptor)
                    .writeTimeout(20, TimeUnit.SECONDS).readTimeout(20, TimeUnit.SECONDS)
                    .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))
                    .build();
        }
        return okHttpClient;
    }

    private static Handler mHandler = null;

    public synchronized static Handler getHandler() {
        if (mHandler == null) {
            mHandler = new Handler();
        }

        return mHandler;
    }

    /**
     * get请求
     * 参数1 url
     * 参数2 回调Callback
     */

    public static void doGet(String url, Callback callback) {

        //创建OkHttpClient请求对象
        OkHttpClient okHttpClient = getOkHttpClient();
        //创建Request
        Request request = new Request.Builder().url(url).build();
        //得到Call对象
        Call call = okHttpClient.newCall(request);
        //执行异步请求
        call.enqueue(callback);


    }


}
---------------------------------------------------
package com.exbawei.liteli.myfulian;



import java.util.List;

/**
 * Created by mamiaomiao on 2017/10/16.
 */

public interface MusicConstract {
    interface IMusicView {
        void setData(List<MusicBean.SongListBean> list);
    }

    interface IMusicModel {
        void getMusicList(int offset, IMusicView view);
    }

    abstract class IMusicPresenter {
        public abstract void getData(int offset);

    }

}
-----------------------------------------------------------

package com.exbawei.liteli.myfulian;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;

import java.util.ArrayList;
import java.util.List;


/**
 * Created by li te li on 2017/10/16.
 */

public class Myadapter extends RecyclerView.Adapter<Myadapter.ViewHolder> {
    List<MusicBean.SongListBean> list = new ArrayList<>();
    Context context;


    public Myadapter(Context context) {
        this.context = context;
    }

    public void add(List<MusicBean.SongListBean> list){
        this.list.addAll(list);
        notifyDataSetChanged();
    }
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view =View.inflate(context,R.layout.item,null);
        ViewHolder vh=new ViewHolder(view);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Glide.with(context).load(list.get(position).getPic_small()).into(holder.iv);
        holder.tv1.setText(list.get(position).getTitle());
        holder.tv2.setText(list.get(position).getAlbum_title());
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        ImageView iv;
        TextView tv1;
        TextView tv2;
        public ViewHolder(View itemView) {
            super(itemView);
             iv= (ImageView) itemView.findViewById(R.id.iv);
             tv1= (TextView) itemView.findViewById(R.id.tv1);
             tv2= (TextView) itemView.findViewById(R.id.tv2);
        }
    }
}