Rxjava功能操作符的使用方法详解

转载  2017-11-11   作者:Genten程泽翔   我要评论
这篇文章主要介绍了Rxjava功能操作符的使用方法详解,还是比较不错的,这里分享给大家,供需要的朋友参考。
Rxjava功能个人感觉很好用,里面的一些操作符很方便,Rxjava有:被观察者,观察者,订阅者, 被观察者通过订阅者订阅观察者,从而实现观察者监听被观察者返回的数据 下面把Rxjava常用的模型代码列出来,还有一些操作符的运用: 依赖:
compile 'io.reactivex.rxjava2:rxandroid:2.0.1' // Because RxAndroid releases are few and far between, it is recommended you also // explicitly depend on RxJava's latest version for bug fixes and new features. compile 'io.reactivex.rxjava2:rxjava:2.1.5'
这个是另一种解析数据的方法,阿里巴巴旗下的,听说是解析最快的解析器。。。。
compile 'com.alibaba:fastjson:1.2.39'
import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.TextView; import com.alibaba.fastjson.JSONObject; import java.io.IOException; import java.util.concurrent.TimeUnit; import io.reactivex.BackpressureStrategy; import io.reactivex.Flowable; import io.reactivex.FlowableEmitter; import io.reactivex.FlowableOnSubscribe; import io.reactivex.Observable; import io.reactivex.ObservableEmitter; import io.reactivex.ObservableOnSubscribe; import io.reactivex.Observer; import io.reactivex.android.schedulers.AndroidSchedulers; import io.reactivex.annotations.NonNull; import io.reactivex.disposables.Disposable; import io.reactivex.functions.BiFunction; import io.reactivex.functions.Consumer; import io.reactivex.functions.Function; import io.reactivex.schedulers.Schedulers; import okhttp3.Call; import okhttp3.Callback; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; public class MainActivity extends AppCompatActivity { private TextView name; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); name = (TextView) findViewById(R.id.name); //用来调用下面的方法,监听。 name.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { interval(); } }); } //例1:Observer public void observer() { //观察者 Observer<string> observer = new Observer<string>() { @Override public void onSubscribe(@NonNull Disposable d) { } @Override public void onNext(@NonNull String s) { //接收从被观察者中返回的数据 System.out.println("onNext :" + s); } @Override public void onError(@NonNull Throwable e) { } @Override public void onComplete() { } }; //被观察者 Observable<string> observable = new Observable<string>() { @Override protected void subscribeActual(Observer<!--? super String--> observer) { observer.onNext("11111"); observer.onNext("22222"); observer.onComplete(); } }; //产生了订阅 observable.subscribe(observer); } //例2:Flowable private void flowable(){ //被观察者 Flowable.create(new FlowableOnSubscribe<string>() { @Override public void subscribe(@NonNull FlowableEmitter<string> e) throws Exception { for (int i = 0; i < 100; i++) { e.onNext(i+""); } } //背压的策略,buffer缓冲区 观察者 //背压一共给了五种策略 // BUFFER、 // DROP、打印前128个,后面的删除 // ERROR、 // LATEST、打印前128个和最后一个,其余删除 // MISSING //这里的策略若不是BUFFER 那么,会出现著名的:MissingBackpressureException错误 }, BackpressureStrategy.BUFFER).subscribe(new Consumer<string>() { @Override public void accept(String s) throws Exception { System.out.println("subscribe accept"+s); Thread.sleep(1000); } }); } //例3:线程调度器 Scheduler public void flowable1(){ Flowable.create(new FlowableOnSubscribe<string>() { @Override public void subscribe(@NonNull FlowableEmitter<string> e) throws Exception { for (int i = 0; i < 100; i++) { //输出在哪个线程 System.out.println("subscribe Thread.currentThread.getName = " + Thread.currentThread().getName()); e.onNext(i+""); } } },BackpressureStrategy.BUFFER) //被观察者一般放在子线程 .subscribeOn(Schedulers.io()) //观察者一般放在主线程 .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<string>() { @Override public void accept(String s) throws Exception { System.out.println("s"+ s); Thread.sleep(100); //输出在哪个线程 System.out.println("subscribe Thread.currentThread.getName = " + Thread.currentThread().getName()); } }); } //例4:http请求网络,map转化器,fastjson解析器 public void map1(){ Observable.create(new ObservableOnSubscribe<string>() { @Override public void subscribe(@NonNull final ObservableEmitter<string> e) throws Exception { OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("https://qhb.2dyt.com/Bwei/login") .build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { String result = response.body().string(); e.onNext(result); } }); } }) //map转换器 flatmap(无序),concatmap(有序) .map(new Function<string, bean="">() { @Override public Bean apply(@NonNull String s) throws Exception { //用fastjson来解析数据 return JSONObject.parseObject(s,Bean.class); } }).subscribe(new Consumer<bean>() { @Override public void accept(Bean bean) throws Exception { System.out.println("bean = "+ bean.toString() ); } }); } //常见rxjava操作符 //例 定时发送消息 public void interval(){ Observable.interval(2,1, TimeUnit.SECONDS) .take(10) .subscribe(new Consumer<long>() { @Override public void accept(Long aLong) throws Exception { System.out.println("aLong = " + aLong); } }); } //例 zip字符串合并 public void zip(){ Observable observable1 = Observable.create(new ObservableOnSubscribe<string>() { @Override public void subscribe(@NonNull ObservableEmitter<string> e) throws Exception { e.onNext("1"); e.onNext("2"); e.onNext("3"); e.onNext("4"); e.onComplete(); } }); Observable observable2 = Observable.create(new ObservableOnSubscribe<string>() { @Override public void subscribe(@NonNull ObservableEmitter<string> e) throws Exception { e.onNext("A"); e.onNext("B"); e.onNext("C"); e.onNext("D"); e.onComplete(); } }); Observable.zip(observable1, observable2, new BiFunction<string,string,string>() { @Override public String apply(@NonNull String o, @NonNull String o2) throws Exception { return o + o2; } }).subscribe(new Consumer<string>() { @Override public void accept(String o) throws Exception { System.out.println("o"+ o); } }); }
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