王学岗RxJava(十六)——merge,zip,join等组合方法

组合就是多输入，单输出，大家看具体的例子

package com.example.acer.rxjavatest;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import rx.Observable;
import rx.Observer;

//需求，打印一组用户名
public class MainActivity extends AppCompatActivity {



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         String[] args1=new String[]{"张欣1","张欣2","张欣3","张欣4"};
        String[] args2=new String[]{"春晓1","春晓2","春晓3","春晓4"};
        //相同的数组可以进行合并
        Observable mergeObservable=Observable.merge(Observable.from(args1),Observable.from(args2));
        mergeObservable.subscribe(new Observer() {
            @Override
            public void onCompleted() {

            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onNext(String s) {
                Log.i("zhang_xin",s);
            }
        });
    }



    }

看下运行效果

注意：在上面的程序中我们还可以把merge换成mergeDelayError();

 Observable<String> mergeObservable=Observable.mergeDelayError(Observable.from(args1),Observable.from(args2));

mergeDelayError()方法:在Observable中，一旦某一个时间抛出异常，后面的序列将会终止，如果我们希望在序列出错的时候不影响后面的序列，那么可以使用mergeDelayErroe()方法！
运行结果同merge同，这里就不展示了！
merge是把两个数组 合并为一个数组，新的数组长度是原来两个数组长度之和；

zip合并后的数组长度是两个数组长度最小的那一个数组的长度；而且我们可以自己定义合并的方式，即合并的算法自己决定：看代码

package com.example.acer.rxjavatest;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import rx.Observable;
import rx.Observer;
import rx.functions.Func2;

//需求，打印一组用户名
public class MainActivity extends AppCompatActivity {



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //数组长度5
         String[] args1=new String[]{"张欣1","张欣2","张欣3","张欣4","zhangxin5"};
         //数组长度4
        String[] args2=new String[]{"春晓1","春晓2","春晓3","春晓4"};
        //相同的数组可以进行合并
        Observable mergeObservable=Observable.zip(Observable.from(args1), Observable.from(args2), new Func2() {
            @Override
            public String call(String s, String s2) {
                //这里使我们合并数组的算法
                return s+"------"+s2;
            }
        });
        mergeObservable.subscribe(new Observer() {
            @Override
            public void onCompleted() {

            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onNext(String s) {
                Log.i("zhang_xin",s);
            }
        });
    }



    }

看下join方法，数组长度是两个数组的乘积；

package com.example.acer.rxjavatest;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import java.util.concurrent.TimeUnit;

import rx.Observable;
import rx.Observer;
import rx.functions.Func1;
import rx.functions.Func2;

//需求，打印一组用户名
public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String[] args1 = new String[]{"张欣1", "张欣2", "张欣3", "张欣4", "zhangxin5"};
        String[] args2 = new String[]{"春晓1", "春晓2", "春晓3", "春晓4"};
        Integer[] args3 = new Integer[]{1, 2, 3, 4, 5, 6};
        Observable o1 = Observable.from(args1);
        Observable o2 = Observable.from(args2);
        //相同的数组可以进行合并
        Observable joinObservable = o2.join(o1, new Func1>() {
            @Override
            public Observable call(String s) {
                return Observable.timer(2, TimeUnit.SECONDS);
            }
        }, new Func1>() {
            @Override
            public Observable call(String s) {
                return Observable.timer(2, TimeUnit.SECONDS);
            }
        }, new Func2() {
            @Override
            public String call(String s, String s2) {
                return s + "-&--" + s2;
            }
        });
        joinObservable.subscribe(new Observer() {
            @Override
            public void onCompleted() {

            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onNext(String s) {
                Log.i("zhang_xin", s);
            }
        });
    }


}