Rxjava基本demo

详情请查看 http://www.jianshu.com/p/856297523728

import rx.Observable;
	import rx.Observer;
	import rx.Subscriber;
	import rx.android.schedulers.AndroidSchedulers;
	import rx.functions.Action0;
	import rx.functions.Action1;
	import rx.functions.Func1;
	import rx.schedulers.Schedulers;

public void onClick(View view) {
	switch (view.getId()) {
	case R.id.bt_one:
	//mainProgressBar.setVisibility(View.VISIBLE);
	//setBitmap1();
	//setBitmap2();
	setBitmap3();
	break;
	case R.id.bt_two:
	Intent intent = new Intent(MainActivity.this, OtherActivity.class);
	startActivity(intent);
	break;
	}
	}
	/**
	* 异步设置图片
	*/
	private void setBitmap1() {
	//创建被观察者
	Observable.create(new Observable.OnSubscribe<Bitmap>() {
	/**
	* 复写call方法
	*
	* @param subscriber 观察者对象
	*/
	@Override
	public void call(Subscriber<? super Bitmap> subscriber) {
	//通过URL得到图片的Bitmap对象
	Bitmap bitmap = GetBitmapForURL.getBitmap(url);
	//回调观察者方法
	subscriber.onNext(bitmap);
	subscriber.onCompleted();
	Log.i(" call ---> ", "运行在 " + Thread.currentThread().getName() + " 线程");
	}
	})
	.subscribeOn(Schedulers.io()) // 指定subscribe()发生在IO线程
	.observeOn(AndroidSchedulers.mainThread()) // 指定Subscriber的回调发生在UI线程
	.subscribe(new Observer<Bitmap>() { //订阅观察者（其实是观察者订阅被观察者）
	@Override
	public void onNext(Bitmap bitmap) {
	mainImageView.setImageBitmap(bitmap);
	Log.i(" onNext ---> ", "运行在 " + Thread.currentThread().getName() + " 线程");
	}
	@Override
	public void onCompleted() {
	mainProgressBar.setVisibility(View.GONE);
	Log.i(" onCompleted ---> ", "完成");
	}
	@Override
	public void onError(Throwable e) {
	Log.e(" onError --->", e.toString());
	}
	});
	}
	/**
	* 事件参数类型的变换
	* 将String类型的URL转换成Bitmap
	*/
	private void setBitmap2() {
	//先传递String类型的Url
	Observable.just(url)
	.map(new Func1<String, Bitmap>() {
	@Override
	public Bitmap call(String s) {
	//通过Map转换成Bitmap类型发送出去
	return GetBitmapForURL.getBitmap(s);
	}
	})
	.subscribeOn(Schedulers.io()) // 指定subscribe()发生在IO线程
	.observeOn(AndroidSchedulers.mainThread()) // 指定Subscriber的回调发生在UI线程
	//可以看到，这里接受的类型是Bitmap，而不是String
	.subscribe(new Action1<Bitmap>() {
	@Override
	public void call(Bitmap bitmap) {
	mainImageView.setImageBitmap(bitmap);
	mainProgressBar.setVisibility(View.GONE);
	}
	});
	}
	/**
	* 事件参数类型的变换
	* 将String类型的URL转换成Bitmap
	* doOnSubscribe的使用
	*/
	private void setBitmap3() {
	Observable.just(url) //IO线程
	.map(new Func1<String, Bitmap>() {
	@Override
	public Bitmap call(String s) {
	Log.i(" map ---> ", "执行");
	Log.i(" map ---> ", Thread.currentThread().getName());
	return GetBitmapForURL.getBitmap(s);
	}
	})
	.subscribeOn(Schedulers.io()) // 指定subscribe()发生在IO线程
	.doOnSubscribe(new Action0() { //需要在主线程中执行 测试来看 默认运行在main线程 ？
	@Override
	public void call() {
	//mainProgressBar.setVisibility(View.VISIBLE);
	Log.i(" doOnSubscribe ---> ", "执行");
	Log.i(" doOnSubscribe ---> ", Thread.currentThread().getName());
	}
	})
	.observeOn(Schedulers.io()) // 指定Subscriber的回调发生在io线程
	.subscribe(new Action1<Bitmap>() {
	@Override
	public void call(Bitmap bitmap) {
	//mainImageView.setImageBitmap(bitmap);
	//mainProgressBar.setVisibility(View.GONE);
	Log.i(" subscribe ---> ", "执行");
	Log.i(" subscribe ---> ", Thread.currentThread().getName());
	}
	});
	}

public class GetBitmapForURL {
	public static Bitmap getBitmap(String url) {
	//获取传进来的参数
	Bitmap bitmap = null;
	URLConnection connection;
	InputStream is;
	BufferedInputStream bis;
	try {
	connection = new URL(url).openConnection();
	is = connection.getInputStream();
	//为了更清楚的看到加载图片的等待操作,将线程休眠2秒钟
	Thread.sleep(2000);
	bis = new BufferedInputStream(is);
	//通过decodeStream方法解析输入流
	bitmap = BitmapFactory.decodeStream(bis);
	is.close();
	bis.close();
	} catch (Exception e) {
	e.printStackTrace();
	}
	return bitmap;
	}
	}