rxjava打开相册上传图片到sm.ms网站

要上传 先搞清楚图片路径,再搞清楚上传网站的表单提交参数要求

下面是代码

首先,做好请求的基本工作

public interface MyService {
//设置请求头 用户代理 (网站需要必须写)
    @Headers("user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36")
//提交方式 和请求的参数
    @Multipart
    @POST("https://sm.ms/api/upload")
    Observable<ResponseBody> getLoad(@Part MultipartBody.Part smfile);

}

接下来就是上传了

public class MainActivity extends AppCompatActivity {


    @BindView(R.id.iv_upload)
    ImageView ivUpload;
    @BindView(R.id.btn_ok)
    Button btnOk;
    @BindView(R.id.iv_success)
    ImageView ivSuccess;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);


    }

    @OnClick(R.id.btn_ok)
    public void onViewClicked() {
    //   首先一定要申请动态权限
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission
                    .READ_EXTERNAL_STORAGE}, 1);
        } else {
//隐式启动打开相册
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setData(MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(intent, 2);
        }


    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 2 && resultCode == RESULT_OK) {
//获取相册里选中的图片 并且利用内容提供者找到绝对路径
            Uri uri = data.getData();
            ivUpload.setImageURI(uri);
            ContentResolver resolver = getContentResolver();
            Cursor cursor = resolver.query(uri, null, null, null, null);
            if (cursor != null && cursor.moveToFirst()) {
                String path = cursor.getString(cursor.getColumnIndex("_data"));
                File file = new File(path);
                uploadImage(file);

            }

        }
    }

    private void uploadImage(File file) {

        Retrofit retrofit = new Retrofit.Builder().baseUrl("https://sm.ms/")
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create()).addConverterFactory
                        (GsonConverterFactory.create())

                .build();

        MyService myService = retrofit.create(MyService.class);
请求体构建 选择要请求的类型 以及请求的文件
        final RequestBody requsetBody = RequestBody.create(MediaType.parse("image/*"), file);
        String name1 = file.getName();
        Log.i("tag", "uploadImage: " + name1);
        MultipartBody.Part name = MultipartBody.Part.createFormData("smfile", file.getName(),
                requsetBody);
请求的参数 按照网站要求name要一致
        Observable<ResponseBody> observable = myService.getLoad(name);
        observable.subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<ResponseBody>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.i("tag", "onSubscribe: ");
            }

            @Override 
            public void onNext(ResponseBody responseBody) {
                try {
//上传成功会返回一个默认json的字符串 解析即可得到上传后的图片网址
                    String string = responseBody.string();
                    Gson gson = new Gson();
                    SuccessResult successResult = gson.fromJson(string, SuccessResult.class);
                    String url = successResult.getData().getUrl();
                    Glide.with(MainActivity.this).load(url).into(ivSuccess);
                    Log.i("tag", "onNext: +" + string);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onError(Throwable e) {
                Log.i("tag", "onError: " + e.getMessage());
            }

            @Override
            public void onComplete() {

            }
        });


    }
}

总结,在上传的时候一定要注意网站的要求去操作相关请求头和请求体