本文章使用的是Retrofit rxjava网络工具类 是世面上使用的网络工具类

不多说直接上代码
1.导入依赖 implementation ‘com.github.wildma:PictureSelector:1.1.1’

implementation 'com.github.wildma:PictureSelector:1.1.1'

2.在项目的build.gradle中 找到一下两个地方

repositories {
    google()
    jcenter()
    maven { url "https://jitpack.io" }//所添加的
}
//还有这个
allprojects {
    repositories {
        google()
        jcenter()
        maven { url "https://jitpack.io" }//所需添加的
    }
}

3.在网络工具类当中

  //xiangji
    public RequestBody getRequsetBody(List<File> files, HashMap<String,String> map){
// if (map.size() < 1){
// return null;
// }
        MultipartBody.Builder builder = new MultipartBody.Builder().setType(MultipartBody.FORM);
        for (Map.Entry<String,String> entry:map.entrySet()){
            Log.i("xxx","key = "+entry.getKey()+"value = "+entry.getValue());
            builder.addFormDataPart(entry.getKey(),entry.getValue()+"");
        }

        for (int i = 0; i <files.size(); i++){
            builder.addFormDataPart("image",files.get(i).getName(),RequestBody.create(MediaType.parse("image/jepg"),files.get(i)));
        }

        return builder.build();
    }

4.bean类

public class UpLoadHeadPicBean {

    private String headPath;
    private String message;
    private String status;

    public String getHeadPath() {
        return headPath;
    }

    public void setHeadPath(String headPath) {
        this.headPath = headPath;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }
}

5.在这个接口中

public interface Apis {
	//这里是你自己要换的地址
	@POST("user/v1/verify/uploadHeadPic")
	Observable<UpLoadHeadPicBean> getUpLoadHeadPicBean(@Body RequestBody body);
}

6.在activity中设置头像点击事件

PictureSelector.create(MyXiangActivity.this, PictureSelector.SELECT_REQUEST_CODE).selectPicture(true, 200, 200, 1, 1);

7.在onActivityResult中回调

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode==RESULT_OK&&requestCode==PictureSelector.SELECT_REQUEST_CODE){
        if (data != null) {
            String stringExtra = data.getStringExtra(PictureSelector.PICTURE_PATH);
            File file = new File(stringExtra);
            ArrayList<File> files = new ArrayList<>();
            files.add(file);
            HashMap<String, String> map = new HashMap<>();
            RequestBody requsetBody = RetrofitManager.getInstance().getRequsetBody(files, map);
                RetrofitManager.getInstance().getApis().getUpLoadHeadPicBean(requsetBody)
                        .subscribeOn(Schedulers.io())
                        .observeOn(AndroidSchedulers.mainThread())
                        .subscribe(new Observer<UpLoadHeadPicBean>() {
                            @Override
                            public void onSubscribe(Disposable d) {

                            }

                            @Override
                            public void onNext(UpLoadHeadPicBean upLoadHeadPicBean) {
                                Toast.makeText(MyXiangActivity.this, ""+upLoadHeadPicBean.getMessage(), Toast.LENGTH_SHORT).show();
                                //如果土司上传成功 你还得在这里面做一个ui更新
                            }

                            @Override
                            public void onError(Throwable e) {

                            }

                            @Override
                            public void onComplete() {

                            }
                        });

      }
     }
}