使用rxjava2.0根据url获取bitmap，并显示到imageview上

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 /*retrofit的引入*/    compile 'com.squareup.retrofit2:retrofit:2.2.0'    compile 'com.squareup.retrofit2:converter-gson:2.1.0'    /*retrofit对rx支持的引入*/    compile 'com.squareup.retrofit2:adapter-rxjava2:2.2.0'    /*rx的引入*/    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'    compile 'io.reactivex.rxjava2:rxjava:2.0.9'

对于rx的引入，只需要最后两个即可，其他的是为了retrofit的使用

例子中的第二个参数，由于是项目使用。所以参数不具备通用性，但是方法就这样

 private void showImage(final String imageUrl, final JCVideoPlayerStandard jcVideoPlayerStandard) {        Observable.create(new ObservableOnSubscribe<Bitmap>() {            @Override            public void subscribe(@io.reactivex.annotations.NonNull ObservableEmitter<Bitmap> e) throws Exception {                //e.onNext(BitmapFactory.decodeResource(getResources(), R.drawable.shoucang));                e.onNext(GetImageInputStream(imageUrl));            }        }).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Observer<Bitmap>() {            @Override            public void onSubscribe(@io.reactivex.annotations.NonNull Disposable d) {            }            @Override            public void onNext(@io.reactivex.annotations.NonNull Bitmap s) {                jcVideoPlayerStandard.thumbImageView.setImageBitmap(s);            }            @Override            public void onError(@io.reactivex.annotations.NonNull Throwable e) {            }            @Override            public void onComplete() {            }        });    }    /**     * 获取网络图片     *     * @param imageurl 图片网络地址     * @return Bitmap 返回位图     */    public Bitmap GetImageInputStream(String imageurl) {        URL url;        HttpURLConnection connection = null;        Bitmap bitmap = null;        try {            url = new URL(imageurl);            connection = (HttpURLConnection) url.openConnection();            connection.setConnectTimeout(6000); //超时设置            connection.setDoInput(true);            connection.setUseCaches(false); //设置不使用缓存            InputStream inputStream = connection.getInputStream();            BitmapFactory.Options options = new BitmapFactory.Options();            options.inSampleSize = 2;            options.inJustDecodeBounds = false;            bitmap = BitmapFactory.decodeStream(inputStream, null, options);            inputStream.close();        } catch (Exception e) {            e.printStackTrace();        }        return bitmap;    }

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