EventBus+OkHttp二次封装+Fresco

当我们进行项目开发的时候，往往是需要应用程序的各组件、组件与后台线程间进行通信，比如在子线程中进行请求数据，当数据请求完毕后通过Handler或者是广播通知UI，而两个Fragment之家可以通过Listener进行通信等等。当我们的项目越来越复杂，使用Intent、Handler、Broadcast进行模块间通信、模块与后台线程进行通信时，代码量大，而且高度耦合。现在就让我们来学习一下EventBus ;
EventBus能够简化各组件间的通信，让我们的代码书写变得简单，能有效的分离事件发送方和接收方(也就是解耦的意思)，能避免复杂和容易出错的依赖性和生命周期问题。
具体开发步骤
/**

1.搭建环境
1.1:依赖:01.okHttp , 02:RecyclerView, 03.Fresco ,04.EventBus,
1.2:网络权限
2.完成布局
3.创建适配器
4.完成RecycleView数据展示
5.使用Fresco定义图片形状,自定义MyApplication
6.在清单文件注册MyApplication
7.使用自定义接口回调实现条目点击事件
8.使用EventBus的黏性事件完成数据传递
*/
1.搭建环境:
依赖:

 implementation 'com.squareup.okhttp3:okhttp:3.4.2'
   implementation 'com.android.support:recyclerview-v7:28.0.0'
   implementation 'com.facebook.fresco:fresco:0.14.1'
   implementation 'org.greenrobot:eventbus:3.0.0'
   implementation 'com.google.code.gson:gson:2.8.5'
   implementation 'com.jakewharton:butterknife:8.8.1'
   annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'

网络权限:

<uses-permission android:name="android.permission.INTERNET " />

期间我们需要用到Fresco,我们需要自定义MyApplication类,现在来清单文件(AndroidManifest)注册一下

  <application
        android:name=".MyApplication"
    </application>

MyApplication:

package com.example.dsjob;

import android.app.Application;

import com.facebook.drawee.backends.pipeline.Fresco;

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

2.MainActivity:

package com.example.dsjob;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.OrientationHelper;
import android.support.v7.widget.RecyclerView;
import com.google.gson.Gson;
import org.greenrobot.eventbus.EventBus;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private RecyclerView rlv;
    private MyAdapter myAdapter;
    private String path = "http://172.17.8.100/movieApi/movie/v1/findHotMovieList?page=1&count=10";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控件
        initView();

        //创建适配器
        myAdapter = new MyAdapter(MainActivity.this);

        //加载网络数据
        initData();
        rlv.setAdapter(myAdapter);
        //设置布局管理器
        rlv.setLayoutManager(new LinearLayoutManager(this,OrientationHelper.VERTICAL,false));

        myAdapter.setOnClickListener(new MyAdapter.OnClickListener() {
            @Override
            public void onClick(String name) {
                EventBus.getDefault().postSticky(name);
                Intent intent = new Intent(MainActivity.this,EventBusActivity.class);
                startActivity(intent);
            }
        });
    }

    private void initData() {
        OkHttpUtils.getInstance().doGet(path, new OkHttpUtils.OkCallback() {
            @Override
            public void success(String json) {
                DataItem dataItem = new Gson().fromJson(json, DataItem.class);
                List<DataItem.ResultBean> result = dataItem.getResult();
                myAdapter.setData(result);
            }

            @Override
            public void failtrue(Exception e) {

            }
        });
    }

    private void initView() {
        rlv = (RecyclerView) findViewById(R.id.rlv);
    }


}

3.EventBusActivity:

package com.example.dsjob;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

/**
 * 接收主页面传递过来的数据
 */
public class EventBusActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btn_eventbus;
    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_event_bus);
        initView();

        //注册EventBus
        EventBus.getDefault().register(this);
    }

    private void initView() {
        btn_eventbus = (Button) findViewById(R.id.btn_eventbus);

        btn_eventbus.setOnClickListener(this);
        tv = (TextView) findViewById(R.id.tv);
        tv.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_eventbus:
                finish();
                break;
        }
    }

    @Subscribe(threadMode = ThreadMode.MAIN,sticky = true)
    public void MessageEventBus(String name) {
        tv.setText(name+"");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //解除注册EventBus
        EventBus.getDefault().unregister(this);
    }
}

4.EventBus消息类:

package com.example.dsjob;

/**
 * date:2018/11/30
 * author:李壮(大壮)
 * function:EventBus消息类
 */
public class EventBusMessage {
    private String name;

    public EventBusMessage(String name) {
        this.name = name;
    }
}

5.适配器:

package com.example.dsjob;

import android.content.Context;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.facebook.drawee.generic.GenericDraweeHierarchy;
import com.facebook.drawee.generic.GenericDraweeHierarchyBuilder;
import com.facebook.drawee.generic.RoundingParams;
import com.facebook.drawee.view.SimpleDraweeView;

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

/**
 * date:2018/11/30
 * author:李壮(大壮)
 * function: RecyclerView适配器
 *   1.创建Xml布局
 *   2.完成展示数据
 *   3.自定义接口回调实现条目点击事件
 */
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private Context mContext;
    private List<DataItem.ResultBean> mResultBeans;

    public MyAdapter(Context context) {
        this.mContext = context;
        mResultBeans = new ArrayList<>();
    }
    public void setData(List<DataItem.ResultBean> result) {
        mResultBeans.clear();
        if (result != null){
            mResultBeans.addAll(result);
        }
        notifyDataSetChanged();
    }
    @NonNull
    @Override//创建Viewolder
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = View.inflate(mContext,R.layout.rlv_item,null);
        ViewHolder viewHolder = new ViewHolder(view);
        return viewHolder;
    }

    @Override//绑定视图
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, final int i) {
       viewHolder.rlv_title.setText(mResultBeans.get(i).getName());
       //获取图片地址
        Uri parse = Uri.parse(mResultBeans.get(i).getImageUrl());
        GenericDraweeHierarchyBuilder genericDraweeHierarchyBuilder = new GenericDraweeHierarchyBuilder(mContext.getResources());

        //设置圆形
        RoundingParams circle = RoundingParams.asCircle();
        GenericDraweeHierarchy build = genericDraweeHierarchyBuilder.setRoundingParams(circle).build();
        viewHolder.rlv_icon.setHierarchy(build);
        viewHolder.rlv_icon.setImageURI(parse);

        //条目点击事件
        viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnClickListener != null){
                    mOnClickListener.onClick(mResultBeans.get(i).getName());
                }
            }
        });
    }

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



    public class ViewHolder extends RecyclerView.ViewHolder {
        private SimpleDraweeView rlv_icon;
        private TextView rlv_title;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            rlv_icon = itemView.findViewById(R.id.rlv_icon);
            rlv_title = itemView.findViewById(R.id.rlv_title);
        }
    }

    //接口回调 点击事件
    public interface OnClickListener{
        void onClick(String name);
    }
    OnClickListener mOnClickListener;

    public void setOnClickListener(OnClickListener onClickListener) {
        mOnClickListener = onClickListener;
    }
}

6.OkHttp二次封装:

package com.example.dsjob;

import android.os.Handler;
import android.os.Looper;

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

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

/**
 * date:2018/11/30
 * author:李壮(大壮)
 * function:OkHttp的二次封装,这里用的是doGet请求
 *   相关知识点:单例模式,接口回调 ,handler
 */
public class OkHttpUtils {

    private Handler mHandler;
    private  OkHttpClient mOkHttpClient;
    private static OkHttpUtils mOkHttpUtils;

    private OkHttpUtils(){
        mHandler = new Handler(Looper.getMainLooper());
        mOkHttpClient = new OkHttpClient.Builder()
                .writeTimeout(10,TimeUnit.SECONDS)
                .readTimeout(10,TimeUnit.SECONDS)
                .connectTimeout(10,TimeUnit.SECONDS)
                .build();
    }

    //使用单例模式
    public static OkHttpUtils getInstance(){
        if (mOkHttpUtils == null){
            synchronized (OkHttpUtils.class){
                if (mOkHttpUtils == null){
                    return mOkHttpUtils = new OkHttpUtils();
                }
            }
        }
        return mOkHttpUtils;
    }

    //接口回调
    public interface OkCallback{
        //成功
        void success(String json);
        //失败
        void failtrue(Exception e);
    }

    //封装doGet请求
    public void doGet(String url, final OkCallback okCallback){
        //创建Request对象
        Request request = new Request.Builder()
                .get()
                .url(url)
                .build();

        //创建call对象
        Call call = mOkHttpClient.newCall(request);

        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        if (okCallback != null){
                            okCallback.failtrue(e);
                        }
                    }
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                try {
                    if (response != null && response.isSuccessful()){
                        final String json = response.body().string();
                        mHandler.post(new Runnable() {
                            @Override
                            public void run() {
                                if (okCallback != null){
                                    okCallback.success(json);
                                }
                            }
                        });
                    }
                }catch (Exception e){
                    e.printStackTrace();
                }


            }
        });
    }
}

7.Bean类:

package com.example.dsjob;

import java.util.List;

public class DataItem {


    private String message;
    private String status;
    private List<ResultBean> result;

    public String getMessage() {
        return message;
    }

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

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public List<ResultBean> getResult() {
        return result;
    }

    public void setResult(List<ResultBean> result) {
        this.result = result;
    }

    public static class ResultBean {
        

        private boolean followMovie;
        private int id;
        private String imageUrl;
        private String name;
        private int rank;
        private String summary;

        public boolean isFollowMovie() {
            return followMovie;
        }

        public void setFollowMovie(boolean followMovie) {
            this.followMovie = followMovie;
        }

        public int getId() {
            return id;
        }

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

        public String getImageUrl() {
            return imageUrl;
        }

        public void setImageUrl(String imageUrl) {
            this.imageUrl = imageUrl;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getRank() {
            return rank;
        }

        public void setRank(int rank) {
            this.rank = rank;
        }

        public String getSummary() {
            return summary;
        }

        public void setSummary(String summary) {
            this.summary = summary;
        }
    }
}

8.XML布局文件

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<?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"
    android:orientation="vertical"
    tools:context=".MainActivity">

   <android.support.v7.widget.RecyclerView
       android:id="@+id/rlv"
       android:layout_width="match_parent"
       android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>

</LinearLayout>

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

    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="接收数值"/>
    <Button
        android:id="@+id/btn_eventbus"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="返回"/>
</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="match_parent">

    <com.facebook.drawee.view.SimpleDraweeView
        android:id="@+id/rlv_icon"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_below="@+id/rlv_title"
        android:layout_marginTop="-25dp"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:id="@+id/rlv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="127dp"
        android:layout_marginLeft="127dp"
        android:layout_marginTop="28dp"
        android:text="标题" />
</RelativeLayout>

这次就与大家分享这么多,希望能够为大家带来帮助

EventBus+OkHttp二次封装+Fresco

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