响应式编程是以异步和数据流来构建事务关系的编程模型，异步和数据流是以构建事务关系而存在，异步是为了区分无关的事务，数据流是为了联系有关的事务
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https://blog.csdn.net/geduo_83/article/details/89740000
1.实现简单的网络请求
Observable
.create(new ObservableOnSubscribe<Response>() {
@Override
public void subscribe(@NonNull ObservableEmitter<Response> e) throws Exception {
Builder builder = new Builder()
.url("http://api.avatardata.cn/MobilePlace/LookUp?key=ec47b85086be4dc8b5d941f5abd37a4e&mobileNumber=13021671512")
.get();
Request request = builder.build();
Call call = new OkHttpClient().newCall(request);
Response response = call.execute();
e.onNext(response);
}
})
.map(new Function<Response, MobileAddress>() {
@Override
public MobileAddress apply(@NonNull Response response) throws Exception {
Log.e(TAG, "map 线程:" + Thread.currentThread().getName() + "\n");
if (response.isSuccessful()) {
ResponseBody body = response.body();
if (body != null) {
Log.e(TAG, "map:转换前:" + response.body());
return new Gson().fromJson(body.string(), MobileAddress.class);
}
}
return null;
}
})
.observeOn(AndroidSchedulers.mainThread())
.doOnNext(new Consumer<MobileAddress>() {
@Override
public void accept(@NonNull MobileAddress s) throws Exception {
Log.e(TAG, "doOnNext 线程:" + Thread.currentThread().getName() + "\n");
mRxOperatorsText.append("\ndoOnNext 线程:" + Thread.currentThread().getName() + "\n");
Log.e(TAG, "doOnNext: 保存成功：" + s.toString() + "\n");
mRxOperatorsText.append("doOnNext: 保存成功：" + s.toString() + "\n");
}
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<MobileAddress>() {
@Override
public void accept(@NonNull MobileAddress data) throws Exception {
Log.e(TAG, "subscribe 线程:" + Thread.currentThread().getName() + "\n");
mRxOperatorsText.append("\nsubscribe 线程:" + Thread.currentThread().getName() + "\n");
Log.e(TAG, "成功:" + data.toString() + "\n");
mRxOperatorsText.append("成功:" + data.toString() + "\n");
}
}, new Consumer<Throwable>() {
@Override
public void accept(@NonNull Throwable throwable) throws Exception {
Log.e(TAG, "subscribe 线程:" + Thread.currentThread().getName() + "\n");
mRxOperatorsText.append("\nsubscribe 线程:" + Thread.currentThread().getName() + "\n");
Log.e(TAG, "失败：" + throwable.getMessage() + "\n");
mRxOperatorsText.append("失败：" + throwable.getMessage() + "\n");
}
});
2.先读取缓存，如果缓存没数据再通过网络请求获取数据后更新UI
Observable<FoodList> cache = Observable
.create(new ObservableOnSubscribe<FoodList>() {
@Override
public void subscribe(@NonNull ObservableEmitter<FoodList> e) throws Exception {
Log.e(TAG, "create当前线程:"+Thread.currentThread().getName() );
FoodList data = CacheManager.getInstance().getFoodListData();
// 在操作符 concat 中，只有调用 onComplete 之后才会执行下一个 Observable
if (data != null){ // 如果缓存数据不为空，则直接读取缓存数据，而不读取网络数据
isFromNet = false;
Log.e(TAG, "\nsubscribe: 读取缓存数据:" );
runOnUiThread(new Runnable() {
@Override
public void run() {
mRxOperatorsText.append("\nsubscribe: 读取缓存数据:\n");
}
});
e.onNext(data);
}else {
isFromNet = true;
runOnUiThread(new Runnable() {
@Override
public void run() {
mRxOperatorsText.append("\nsubscribe: 读取网络数据:\n");
}
});
Log.e(TAG, "\nsubscribe: 读取网络数据:" );
e.onComplete();
}
}
});
Observable<FoodList> network = Rx2AndroidNetworking.get("http://www.tngou.net/api/food/list")
.addQueryParameter("rows",10+"")
.build()
.getObjectObservable(FoodList.class);
// 两个 Observable 的泛型应当保持一致
Observable
.concat(cache,network)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<FoodList>() {
@Override
public void accept(@NonNull FoodList tngouBeen) throws Exception {
Log.e(TAG, "subscribe 成功:"+Thread.currentThread().getName() );
if (isFromNet){
mRxOperatorsText.append("accept : 网络获取数据设置缓存: \n");
Log.e(TAG, "accept : 网络获取数据设置缓存: \n"+tngouBeen.toString() );
CacheManager.getInstance().setFoodListData(tngouBeen);
}
mRxOperatorsText.append("accept: 读取数据成功:" + tngouBeen.toString()+"\n");
Log.e(TAG, "accept: 读取数据成功:" + tngouBeen.toString());
}
}, new Consumer<Throwable>() {
@Override
public void accept(@NonNull Throwable throwable) throws Exception {
Log.e(TAG, "subscribe 失败:"+Thread.currentThread().getName() );
Log.e(TAG, "accept: 读取数据失败："+throwable.getMessage() );
mRxOperatorsText.append("accept: 读取数据失败："+throwable.getMessage()+"\n");
}
});
3.多个网络请求依次依赖
Rx2AndroidNetworking.get("http://www.tngou.net/api/food/list")
.addQueryParameter("rows", 1 + "")
.build()
.getObjectObservable(FoodList.class) // 发起获取食品列表的请求，并解析到FootList
.subscribeOn(Schedulers.io()) // 在io线程进行网络请求
.observeOn(AndroidSchedulers.mainThread()) // 在主线程处理获取食品列表的请求结果
.doOnNext(new Consumer<FoodList>() {
@Override
public void accept(@NonNull FoodList foodList) throws Exception {
// 先根据获取食品列表的响应结果做一些操作
Log.e(TAG, "accept: doOnNext :" + foodList.toString());
mRxOperatorsText.append("accept: doOnNext :" + foodList.toString()+"\n");
}
})
.observeOn(Schedulers.io()) // 回到 io 线程去处理获取食品详情的请求
.flatMap(new Function<FoodList, ObservableSource<FoodDetail>>() {
@Override
public ObservableSource<FoodDetail> apply(@NonNull FoodList foodList) throws Exception {
if (foodList != null && foodList.getTngou() != null && foodList.getTngou().size() > 0) {
return Rx2AndroidNetworking.post("http://www.tngou.net/api/food/show")
.addBodyParameter("id", foodList.getTngou().get(0).getId() + "")
.build()
.getObjectObservable(FoodDetail.class);
}
return null;
}
})
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<FoodDetail>() {
@Override
public void accept(@NonNull FoodDetail foodDetail) throws Exception {
Log.e(TAG, "accept: success ：" + foodDetail.toString());
mRxOperatorsText.append("accept: success ：" + foodDetail.toString()+"\n");
}
}, new Consumer<Throwable>() {
@Override
public void accept(@NonNull Throwable throwable) throws Exception {
Log.e(TAG, "accept: error :" + throwable.getMessage());
mRxOperatorsText.append("accept: error :" + throwable.getMessage()+"\n");
}
});
4.结合多个接口的数据更新UI
Observable<MobileAddress> observable1 = Rx2AndroidNetworking.get("http://api.avatardata.cn/MobilePlace/LookUp?key=ec47b85086be4dc8b5d941f5abd37a4e&mobileNumber=13021671512")
.build()
.getObjectObservable(MobileAddress.class);
Observable<CategoryResult> observable2 = Network.getGankApi()
.getCategoryData("Android",1,1);
Observable.zip(observable1, observable2, new BiFunction<MobileAddress, CategoryResult, String>() {
@Override
public String apply(@NonNull MobileAddress mobileAddress, @NonNull CategoryResult categoryResult) throws Exception {
return "合并后的数据为：手机归属地："+mobileAddress.getResult().getMobilearea()+"人名："+categoryResult.results.get(0).who;
}
}).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<String>() {
@Override
public void accept(@NonNull String s) throws Exception {
Log.e(TAG, "accept: 成功：" + s+"\n");
}
}, new Consumer<Throwable>() {
@Override
public void accept(@NonNull Throwable throwable) throws Exception {
Log.e(TAG, "accept: 失败：" + throwable+"\n");
}
});
5.间隔任务实现心跳
private Disposable mDisposable;
@Override
protected void doSomething() {
mDisposable = Flowable.interval(1, TimeUnit.SECONDS)
.doOnNext(new Consumer<Long>() {
@Override
public void accept(@NonNull Long aLong) throws Exception {
Log.e(TAG, "accept: doOnNext : "+aLong );
}
})
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Consumer<Long>() {
@Override
public void accept(@NonNull Long aLong) throws Exception {
Log.e(TAG, "accept: 设置文本 ："+aLong );
mRxOperatorsText.append("accept: 设置文本 ："+aLong +"\n");
}
});
}
/**
* 销毁时停止心跳
*/
@Override
protected void onDestroy() {
super.onDestroy();
if (mDisposable != null){
mDisposable.dispose();
}
}
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