Rx是响应式编程的意思, 本质是观察者模式, 是以观察者(Observer)和订阅者(Subscriber)为基础的异步响应方式. 在Android编程时, 经常会使用后台线程, 那么就可以使用这种方式. 目前的异步编程方式都会导致一些问题, 如
(1) Asynctasks can easily lead to memory leaks
(2) CursorLoaders with a ContentProvider require a large amount of configuration and boilerplate code to setup.
(3) Services are intended for longer running background tasks and not fast-finishing operations, such as making a network call or loading content from a database.
RxAndroid来源于RxJava, 在RxJava的基础上扩展了一些Android的功能 来处理异步的任务处理,它可以使代码更加优雅，代码的可维护性更强。
下面简单介绍Rx_Android的几种实用方法
1.create方式(1)建立
/**
* 使用create方式
*/
public static void createObserable(){
Observable<String>observable=Observable.create(new Observable.OnSubscribe<String>(){
@Override
public void call(Subscriber<? super String> subscriber) {
if(!subscriber.isUnsubscribed()){
subscriber.onNext("hello");
subscriber.onNext("world");
subscriber.onNext(downloadJson());
subscriber.onCompleted();
}
}
});
Subscriber<String>showsub=new Subscriber<String>() {
@Override
public void onCompleted() {
Log.e(TAG,"onCompleted");
}
@Override
public void onError(Throwable e) {
Log.e(TAG,e.getMessage());
}
@Override
public void onNext(String s) {
Log.e(TAG,"result->>"+s);
}
};
//关联被观察者
observable.subscribe(showsub);
}/**
* 调用下载方法
* @return
*/
public static String downloadJson(){
return "json success!";
}cretae 方式(2)建立
/**
* create的第2中方法
*/
public static void createPrint(){
Observable.create(new Observable.OnSubscribe<Integer>() {
@Override
public void call(Subscriber<? super Integer> subscriber) {
if(!subscriber.isUnsubscribed()){
for(int i=0;i<10;i++){
subscriber.onNext(i);
}
subscriber.onCompleted();
}
}
}).subscribe(new Subscriber<Integer>() {
@Override
public void onCompleted() {
Log.i(TAG,"onCompleted");
}
@Override
public void onError(Throwable e) {
Log.i(TAG,e.getMessage());
}
@Override
public void onNext(Integer integer) {
Log.i(TAG,"result-->>"+integer);
}
});
}
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