一:OkGo介绍

该库是封装了okhttp的网络框架，可以与RxJava完美结合，比Retrofit更简单易用。支持大文件上传下载，上传进度回调，下载进度回调，表单上传（多文件和多参数一起上传），链式调用，可以自定义返回对象，支持Https和自签名证书，支持cookie自动管理，支持四种缓存模式缓存网络数据，支持301、302重定向，扩展了统一的上传管理和下载管理功能

作用：网络请求的框架(okhttp)

功能:上传，下载(图片，文件MP3，字符串)

添加依赖

implementation 'com.lzy.net:okgo:3.0.4'

二:get请求

下载json

public void downjson(View view) {
    new Thread(new Runnable() {
        @Override
        public void run() {
            OkGo.<String>get("https://news-at.zhihu.com/api/4/news/latest").execute(new StringCallback() {
                @Override
                public void onSuccess(Response<String> response) {
                    final String body = response.body();
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(MainActivity.this, body, Toast.LENGTH_SHORT).show();
                        }
                    });
                }

                @Override
                public void downloadProgress(Progress progress) {
                    super.downloadProgress(progress);
                    //progress.fraction 获得当前上传进度 范围0-1
                    progressId.setProgress((int) (progress.fraction*100));
                }

                @Override
                public void onError(Response<String> response) {
                    super.onError(response);
                }
            });
        }
    }).start();
}

下载图片

public void downphoto(View view) {
    new Thread(new Runnable() {
        @Override
        public void run() {
            OkGo.<Bitmap>get("http://i.kinja-img.com/gawker-media/image/upload/s--B7tUiM5l--/gf2r69yorbdesguga10i.gif").execute(new BitmapCallback() {
                @Override
                public void onSuccess(Response<Bitmap> response) {
                    Bitmap bitmap = response.body();
                    Log.i(TAG, "onSuccess: 图片大小"+bitmap.getByteCount());
                    imageId.setImageBitmap(bitmap);
                }

                @Override
                public void downloadProgress(Progress progress) {
                    super.downloadProgress(progress);
                    progressId.setProgress((int) (progress.fraction*100));
                }
            });
        }
    }).start();
}

下载MP4

public void downmp3(View view) {
    new Thread(new Runnable() {
        @Override
        public void run() {
            OkGo.<File>get("http://uvideo.spriteapp.cn/video/2019/0512/56488d0a-7465-11e9-b91b-1866daeb0df1_wpd.mp4").execute(new FileCallback("/mnt/sdcard","jiat.mp4") {
                @Override
                public void onSuccess(Response<File> response) {

                }
                @Override
                public void downloadProgress(Progress progress) {
                    super.downloadProgress(progress);
                    //如何拿到当前的下载进度
                    progressId.setProgress((int)(progress.fraction*100));
                }
            });
        }
    }).start();
}

post请求

public void upLoade(){
    OkGo.<String>post("http://10.1.2.121/text/").isMultipart(true).params("file",new File("mnt/sdcard/aaa.mp3"),"huolai.mp3").execute(new StringCallback() {
        @Override
        public void onSuccess(Response<String> response) {
            Log.d(TAG, "onSuccess: "+response.body());
        }

        @Override
        public void uploadProgress(Progress progress) {
            super.uploadProgress(progress);
        }
    });
}