Android中RxJava使用4----请求两次，第二次请求的参数是第一次请求的结果

思路：
1请求数据，根据用户名和密码，获取User_id
2再请求数据，根据User_id，获取用户信息
具体实现代码：
2.1、在build.gradle中添加依赖

compile 'com.jakewharton.rxbinding:rxbinding:0.4.0'

这个依赖包中包含了
rxbinding-0.4.0 （操作控件）
rxjava-1.1.0 (Java相关的)
rxandroid-1.1.0 (安卓相关的)
2.2、MainActivity中

package com.zhh.app;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.orhanobut.logger.Logger;

import rx.Observable;
import rx.Observer;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Func1;
import rx.schedulers.Schedulers;

/**
 * 第四节
 * 登录接口返回的用户信息
 * 思路：
 * 1请求数据，根据用户名和密码，获取User_id
 * 2在请求数据，根据User_id，获取用户信息
 *
 * FlatMap将一个发射数据的Observable变换为多个Observables，然后将它们发射的数据合并后放进一个单独的Observable
 */
public class MainActivity extends Activity {

    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                clickMap();
            }
        });
    }

    /**
     * 登录接口需要的参数
     *
     * @return
     */
    private UserParam getUserParam() {
        UserParam pa = new UserParam("cniao5", "123456");
        return pa;
    }

    /**
     * 登录接口返回的setUser_id
     * 作为下一个接口的参数
     *
     * @return
     */
    private BaseResult getBaseResult() {
        BaseResult baseResult = new BaseResult();
        baseResult.setUser_id(112);
        return baseResult;
    }

    /**
     * @return 登录接口返回的用户信息
     */
    private User getUser() {
        User user = new User();
        user.setUsername("zhh");
        return user;
    }

    private void clickMap() {
//      发送 UserParam对象
        Observable.just(getUserParam())
                //      传入 UserParam 对象，返回 BaseResult 对象
                .flatMap(new Func1<UserParam, Observable<BaseResult>>() {
                    @Override
                    public Observable<BaseResult> call(UserParam userParam) {
                        //                      模拟数据请求
//                      数据请求
                        String userName = userParam.getUsername();
                        String passWord = userParam.getPassword();
//                      请求数据，然后把返回的数据分成 UserParam 对象
                        BaseResult baseResult = getBaseResult();
//                      发送BaseResult
                        return Observable.just(baseResult);
                    }
                })
                        //              传入BaseResult对象，返回User对象
                .flatMap(new Func1<BaseResult, Observable<User>>() {
                    @Override
                    public Observable<User> call(BaseResult baseResult) {

                        int id = baseResult.getUser_id();
//                      模拟数据请求
//                      id作为参数去请求数据，返回的数据，封装成User对象
                        User user = getUser();
//                      发送 user
                        return Observable.just(user);
                    }
                })
                        //              被观察者，设置为子线程
                .subscribeOn(Schedulers.io())
//              观察者，设置为主线程
                .observeOn(AndroidSchedulers.mainThread())
//              订阅，接收user对象
                .subscribe(new Observer<User>() {
                    @Override
                    public void onCompleted() {

                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onNext(User user) {
//                      接收user对象
                        Logger.t("111").d("登录后获取用户信息" + user.getUsername());
                    }
                });
    }

}

2.3、实体类 UserParam

package com.zhh.app;

/**
 * Created by 16838 on 2018/10/25.
 */
public class UserParam {
    private String username;
    private String password;

    public UserParam(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }


}

2.4、实体类BaseResult

package com.zhh.app;

/**
 * Created by 16838 on 2018/10/25.
 */
public class BaseResult {

    private int success;
    private String message;
    private int user_id;

    public int getUser_id() {
        return user_id;
    }

    public void setUser_id(int user_id) {
        this.user_id = user_id;
    }

    public int getSuccess() {
        return success;
    }

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

    public String getMessage() {
        return message;
    }

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

2.5、实体类 User

package com.zhh.app;

/**
 * Created by Ivan on 2016/10/7.
 */


public class User {


    private String head_url;
    private String id;
    private String username;


    public User(String head_url, String id, String username) {
        this.head_url = head_url;
        this.id = id;
        this.username = username;
    }


    public User(String id, String username) {
        this.id = id;
        this.username = username;
    }

    public User() {
    }

    public String getHead_url() {
        return head_url;
    }

    public void setHead_url(String head_url) {
        this.head_url = head_url;
    }

    public String getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }


}

2.6 activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    >
    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="登录后获取用户信息"
        />

</LinearLayout>

RxBinding地址
https://github.com/JakeWharton/RxBinding

RxJava中文文档（PDF/ePub/Mobi格式下载会全面一点）
https://mcxiaoke.gitbooks.io/rxdocs/content/

RxJava英文文档
http://reactivex.io/documentation/operators.html#alphabetical

参考视频：
https://www.cniao5.com/course/lessons/10120

源码下载：
https://download.csdn.net/download/zhaihaohao1/10748103
源码----RxJavaCN2----app4

Android中RxJava使用4----请求两次，第二次请求的参数是第一次请求的结果

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