RxJava+头像上传

 //Retrofit依赖
    compile 'com.squareup.retrofit2:retrofit:2.3.0'
    //数据解析
    compile 'com.squareup.retrofit2:converter-gson:2.3.0'
    //关联RXJava
    compile 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
    //RxJava依赖
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
    compile 'io.reactivex.rxjava2:rxjava:2.1.7'
    compile 'org.greenrobot:greendao:3.2.2' // add library

public interface API {
    //需要用户登录获得token值的时候需要登录
    @FormUrlEncoded
    @POST("user/login")
    Observable> login(@Field("mobile") String mobile,
                                     @Field("password") String password);
    /**
     * 文件上传
     * @param url
     * @param uid
     * @param token
     * @param img_part
     * @return
     */
    @Multipart //上传文件的注解
    @POST("file/upload")
    Observable upload(
                                @Part("uid") RequestBody uid,//用户ID
                                @Part MultipartBody.Part img_part);//图片文件
}

 //BUtton点击事件
    /**
     * 相机拍照
     *
     * @param view
     */ public void camera_pic(View view) {
        // 这个出捕获图片的常量值
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // 设置图片输出位置; 输出到制定的uri路径上;
        intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(path)));
        // 设置请求码
        startActivityForResult(intent, 100);

    }
    /**
     * 相册选取照片
     *
     * @param view
     */
    public void picCollection_pic(View view) {
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");
        startActivityForResult(intent, 101);
    }

 //Intent回调
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //照相机
        if (requestCode == 100 && resultCode == RESULT_OK) {
            //拍照直接上传时用
            Uri uri = Uri.fromFile(new File(path));
            File file = new File(uri.getPath());
            loginUpload("13834352233", "123456", file);
            iv.setImageURI(uri);
            //需要剪切时用
            crop(Uri.fromFile(new File(path)));
            //从相册直接选取照片回调
        } else if (requestCode == 101 && resultCode == RESULT_OK) {
            // 获取data中的数据
            //拍照直接上传时用
            Uri uri = data.getData();
            //uri类型装换为String
            String realPathFromURI = getRealPathFromURI(uri);
            //再变为file类型
            File file = new File(realPathFromURI);
            loginUpload("13834352233", "123456", file);
           iv.setImageURI(uri);
            //需要剪切时用
           crop(uri);
            //剪切回调
        } else if (requestCode == 102 && resultCode == RESULT_OK) {
            //这个参数data,是固定写法
            Bitmap bitmap = data.getParcelableExtra("data");
            Uri uri = Uri.parse(MediaStore.Images.Media.insertImage(getContentResolver(), bitmap, null,null));
            //uri类型装换为String
            String realPathFromURI = getRealPathFromURI(uri);
            //再变为file类型
            File file = new File(realPathFromURI);
            loginUpload("13834352233", "123456", file);
            iv.setImageBitmap(bitmap);
        }
    }

/**
     * 剪裁是系统提供的一个应用,我们需要用intent
     *
     * @param uri
     */
    public void crop(Uri uri) {
        // 隐式启动, 里面传的是action
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        intent.putExtra("crop", "true");
        // 裁剪框的比例，1：1
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // 裁剪后输出图片的尺寸大小
        intent.putExtra("outputX", 250);
        intent.putExtra("outputY", 250);
        intent.putExtra("outputFormat", "JPEG");// 图片格式
        intent.putExtra("noFaceDetection", false);// 取消人脸识别
        // 设置剪裁后是否返回数据
        intent.putExtra("return-data", true);
        // 开启一个带有返回值的Activity，请求码为PHOTO_REQUEST_CUT
        startActivityForResult(intent, 102);
    }

 //传入图片uri地址变为String
    private String getRealPathFromURI(Uri contentUri) {
        String[] proj = { MediaStore.Images.Media.DATA };
        CursorLoader loader = new CursorLoader(MainActivity.this, contentUri, proj, null, null, null);
        Cursor cursor = loader.loadInBackground();
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }

//上传方法
    public void loginUpload(String phone, String pwd, final File file) {
        //TODO token 验证token
        RetrofitHelper.getRetrofit(Urls.URSE).create(API.class).login( phone, pwd)
                //TODO  flatMap 应用场景？？？
                .flatMap(new Function, ObservableSource>() {
                    @Override
                    public ObservableSource apply(HttpData userHttpData) throws Exception {
                        if (userHttpData != null) {
                            User user = userHttpData.data;
                            if (user != null) {
                                //UID
                                RequestBody uid = RequestBody.create(MediaType.parse("multipart/form-data"), user.uid);
                                //TOKEN
                                RequestBody token = RequestBody.create(MediaType.parse("multipart/form-data"), user.token);
                                RequestBody requestImgFile = RequestBody.create(MediaType.parse("multipart/form-data"), file);
                                // 创建MultipartBody.Part，用于封装文件数据
                                MultipartBody.Part requestImgPart =
                                        MultipartBody.Part.createFormData("file", file.getName(), requestImgFile);
                                return RetrofitHelper.getRetrofit(Urls.UP).create(API.class).upload( uid,  requestImgPart);
                            }
                        }
                        return Observable.empty();
                    }
                })
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer() {
                    @Override
                    public void accept(HttpData httpData) throws Exception {
                        Toast.makeText(MainActivity.this, httpData.msg, Toast.LENGTH_SHORT).show();
                    }
                });
    }