Hi, I haven’t updated it for a long time, but today I would like to introduce you to the framework that has been popular for a long time,Retrofit plus R xJava

• introduce
• advantages
• Use necessary actions
• Request method, request header, request parameter table introduction
• @ GET request:
• @ POST request
• Open the local album and select a picture to upload the picture
• @ Url using:

XJava to work with)

introduce

Retrofit is an enhanced version of OKHTTP that encapsulates okHTTP underneath. To be precise, Retrofit is an encapsulation of a RESTful HTTP Web request framework. Because the web request work is essentially done by OKHTTP, Retrofit is responsible for encapsulating the web request interface.

advantages

Use necessary actions

Add dependencies:

    //Retrofit:
    implementation 'com. Squareup. Retrofit2: retrofit: 2.9.0'
    implementation 'com. Squareup. Retrofit2: converter - gson: 2.4.0'


    //glide4: // for image processing
    implementation 'com. Making. Bumptech. Glide: glide: 4.8.0'
    annotationProcessor 'com. Making. Bumptech. Glide: the compiler: 4.8.0'

    //RxJava:
    implementation "IO. Reactivex. Rxjava2: rxjava: 2.1.3" // Required Rxjava2 dependency
    implementation "IO. Reactivex. Rxjava2: rxandroid: 2.0.1." " // The rxandrroID dependency is required for thread cutting
    implementation 'com. Squareup. Retrofit2: adapter - rxjava2:2.4.0' // Necessary dependencies, which must be used in conjunction with Retrofit, are discussed below

    /** * log interceptor */
    implementation 'com. Squareup. Okhttp3: logging - interceptor: 3.3.1'
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Request method, request header, request parameter table introduction

@ GET request:

Define an interface:

public interface ApiServer {

	// Define the first half of the interface to request, note: this must end with /!!
    public static String BaseUri = "https://gank.io/api/data/%E7%A6%8F%E5%88%A9/";

	 /** * is used by calling getMeiNvBen()@PathAnnotation, set the parameters passed to@GET() * Implement GET pass */
 	@GET("{number}/{index}")
    Observable<MeiNvBean> getMeiNvBean(@Path("number")String number, @Path("index")String index);

	/ * * * *@paramMethod Method of a network request (case sensitive) *@paramPath Network request address path *@paramHasBody has a request body *@return* /
    @HTTP(method = "GET",path = "{number}/{index}" ,hasBody = false)
    Observable<MeiNvBean> getHttpMeiNvBean(@Path("number")String number, @Path("index")String index);

}
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My MeiNvBean class uses Postman software to request data and GsonFromat to get the corresponding entity class:

Get the MeiNvBean entity class:

package demo.ht.com.volley.bean;

import java.util.List;

public class MeiNvBean {

    /** * error : false * results : [{" _id ":" 5 be14edb9d21223dd50660f8 ", "createdAt" : "the 2018-11-06 T08: thus. 656 z", "desc" : "2018-11-06", "publishedAt" : "the 2018-11-06 T 00:00:00. 0 z ", "the source", "web", "type" : "welfare", "url" : "https://img.lijinshan.site/images/8733844e0b954e7e8e29102cefa32dbf", "2 ": true," who ", "lijinshanmx"}, {" _id ":" 5 bcd71979d21220315c663fc ", "createdAt" : "the 2018-10-22 T06:43:35. 440 z", "desc" : "2018-10-22" , "publishedAt" : "the 2018-10-22 T00:00:00. 0 z", "source" : "web", "type" : "welfare", "url" : "https://img.lijinshan.site/images/0bc3ed0deda7 4674b45bebb140bb5928","used":true,"who":"lijinshanmx"},{"_id":"5bc434ac9d212279160c4c9e","createdAt":"2018-10-15T06:33:1 6.497 Z ", "desc" : "2018-10-15", "publishedAt" : "the 2018-10-15 T00:00:00. 0 Z", "source" : "web", "type" : "welfare", "url" : "https://img.lijinsh an.site/images/1635f0ffd94f40ff8058c2c4ff652e61","used":true,"who":"lijinshanmx"},{"_id":"5bbb0de09d21226111b86f1c","cre AtedAt ":" the 2018-10-08 T07:57:20. 978 z ", "desc" : "2018-10-08", "publishedAt" : "the 2018-10-08 T00:00:00. 0 z", "source" : "web", "type" : "welfare" ,"url":"https://img.lijinshan.site/images/e930b75f48ae40b0a23f827e619d76a3","used":true,"who":"lijinshanmx"},{"_id":"5ba 206 ec9d2122610aba3440 createdAt ", "" :" the 2018-09-19 T08: at 21:00. 295 z ", "desc" : "2018-09-19", "publishedAt" : "the 2018-09-19 T00:00:00. 0 z" , "the source", "web", "type" : "welfare", "url" : "https://img.lijinshan.site/images/d19c8feacc884e18898034c79e6e1a9d", "2" : true, "who" : "lijinshanmx"}, {" _id ":" 5 b9771a29d212206c1b383d0 ", "createdAt" : "the 2018-09-11 T07: them. 491 z", "desc" : "2018-09-11", "publishedA T ":" the 2018-09-11 T00:00:00. 0 z ", "source" : "web", "type" : "welfare", "url" : "https://img.lijinshan.site/images/38ddf2ca672345889343b574 8 ffce78d ", "2" : true, "who", "lijinshanmx"}, {" _id ":" 5 b830bba9d2122031f86ee51 ", "createdAt" : "the 2018-08-27 T04: they. 703 z", "des C ":" 2018-08-27 ", "publishedAt" : "the 2018-08-28 T00:00:00. 0 z", "source" : "web", "type" : "welfare", "url" : "https://img.lijinshan.site/imag es/a8aa7df22298413e9ca37c7a634e3425","used":true,"who":"lijinshanmx"},{"_id":"5b7b836c9d212201e982de6e","createdAt":"201 : the 8-08-21 T11 glorifying the. 989 z ", "desc" : "2018-08-21", "publishedAt" : "the 2018-08-21 T00:00:00. 0 z", "source" : "web", "type" : "welfare", "url" : "HTTP s://ws1.sinaimg.cn/large/0065oQSqly1fuh5fsvlqcj30sg10onjk.jpg","used":true,"who":"lijinshanmx"}] */

    private boolean error;
    private List<ResultsBean> results;

    @Override
    public String toString(a) {
        return "MeiNvBean{" +
                "error=" + error +
                ", results=" + results +
                '} ';
    }

    public boolean isError(a) {
        return error;
    }

    public void setError(boolean error) {
        this.error = error;
    }

    public List<ResultsBean> getResults(a) {
        return results;
    }

    public void setResults(List<ResultsBean> results) {
        this.results = results;
    }

    public static class ResultsBean {
        /** * _ID: 5be14edb9d21223DD50660F8 * createdAt: 2018-11-06T08:20:43.656z * desc: 2018-11-06t08:20:43.656z * publishedAt: 2018-11-06T00:00.0z * source: web * type: benefits * URL: https://img.lijinshan.site/images/8733844e0b954e7e8e29102cefa32dbf * used : true * who : lijinshanmx */

        private String _id;
        private String createdAt;
        private String desc;
        private String publishedAt;
        private String source;
        private String type;
        private String url;
        private boolean used;
        private String who;

        @Override
        public String toString(a) {
            return "ResultsBean{" +
                    "_id='" + _id + '\' ' +
                    ", createdAt='" + createdAt + '\' ' +
                    ", desc='" + desc + '\' ' +
                    ", publishedAt='" + publishedAt + '\' ' +
                    ", source='" + source + '\' ' +
                    ", type='" + type + '\' ' +
                    ", url='" + url + '\' ' +
                    ", used=" + used +
                    ", who='" + who + '\' ' +
                    '} ';
        }

        public String get_id(a) {
            return _id;
        }

        public void set_id(String _id) {
            this._id = _id;
        }

        public String getCreatedAt(a) {
            return createdAt;
        }

        public void setCreatedAt(String createdAt) {
            this.createdAt = createdAt;
        }

        public String getDesc(a) {
            return desc;
        }

        public void setDesc(String desc) {
            this.desc = desc;
        }

        public String getPublishedAt(a) {
            return publishedAt;
        }

        public void setPublishedAt(String publishedAt) {
            this.publishedAt = publishedAt;
        }

        public String getSource(a) {
            return source;
        }

        public void setSource(String source) {
            this.source = source;
        }

        public String getType(a) {
            return type;
        }

        public void setType(String type) {
            this.type = type;
        }

        public String getUrl(a) {
            return url;
        }

        public void setUrl(String url) {
            this.url = url;
        }

        public boolean isUsed(a) {
            return used;
        }

        public void setUsed(boolean used) {
            this.used = used;
        }

        public String getWho(a) {
            return who;
        }

        public void setWho(String who) {
            this.who = who; }}}Copy the code

Use the most primitive unwrapped GET request data:

Retrofit apiServer = new Retrofit.Builder().
                addCallAdapterFactory(RxJava2CallAdapterFactory.create()).
                addConverterFactory(GsonConverterFactory.create())
                .baseUrl(ApiServer.BaseUri)
                .build();

// apiServer.create(ApiServer.class).getHttpMeiNvBean("8","1")
        apiServer.create(ApiServer.class).getMeiNvBean("8"."1")
                .subscribeOn(Schedulers.io())/ / IO thread
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<MeiNvBean>() {
                    @Override
                    public void onSubscribe(Disposable d) {}@Override
                    public void onNext(MeiNvBean meiNvBean) {
                        mTv.setText(meiNvBean.toString());
                        Log.i("szjonNex", meiNvBean.toString());
                    }

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

                    @Override
                    public void onComplete(a) {}});Copy the code

Come to Kangkang Log:

@ POST request

public interface ApiServer {
	// Define the first half of the interface to request, note: this must end with /!!
	public static String GuoChuangYun_BaseUri = "http://hn216.api.yesapi.cn/";

	 / * * * *@paramFormUrlEncoded uploads must be added via FieldMap@FormUrlEncodedThe annotation indicates the declaration form upload *@return* /
    @FormUrlEncoded
    @POST("? s=App.User.Search")
    Observable<GuoChuangYunBean> getPOSTGuoCHuangYunBean(@FieldMap Map<String ,String > map);

	 / * * * *@paramFormBody app_key = new formBody.builder () *.add("key", "valye") *.build(); *@return* /
    @POST("? s=App.User.Search")
    Observable<GuoChuangYunBean> getPOSTBodyGuoCHuangYunBean(@Body RequestBody body);
}
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package demo.ht.com.volley.bean;

import java.util.List;

public class GuoChuangYunBean {

    / ret: * * * 200 * data: {" err_code ": 0," err_msg ":" ", "users" : []} * MSG: V3.1.0 YesApi App. The User. The Search * /

    private int ret;
    private DataBean data;
    private String msg;

    @Override
    public String toString(a) {
        return "GuoChuangYunBean{" +
                "ret=" + ret +
                ", data=" + data +
                ", msg='" + msg + '\' ' +
                '} ';
    }

    public int getRet(a) {
        return ret;
    }

    public void setRet(int ret) {
        this.ret = ret;
    }

    public DataBean getData(a) {
        return data;
    }

    public void setData(DataBean data) {
        this.data = data;
    }

    public String getMsg(a) {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public static class DataBean {
        /** * err_code : 0 * err_msg : * users : [] */

        private int err_code;
        private String err_msg;
        privateList<? > users;@Override
        public String toString(a) {
            return "DataBean{" +
                    "err_code=" + err_code +
                    ", err_msg='" + err_msg + '\' ' +
                    ", users=" + users +
                    '} ';
        }

        public int getErr_code(a) {
            return err_code;
        }

        public void setErr_code(int err_code) {
            this.err_code = err_code;
        }

        public String getErr_msg(a) {
            return err_msg;
        }

        public void setErr_msg(String err_msg) {
            this.err_msg = err_msg;
        }

        publicList<? > getUsers() {return users;
        }

        public void setUsers(List
        users) {
            this.users = users; }}}Copy the code

HashMap<String, String> stringHashMap = new HashMap<>();
        stringHashMap.put("app_key"."74D2E724FE2B69EF7EA3F38E9400CF71");

        FormBody app_key = new FormBody.Builder()
                .add("app_key"."74D2E724FE2B69EF7EA3F38E9400CF71")
                .build();

Retrofit apiServer = new Retrofit.Builder().
                addCallAdapterFactory(RxJava2CallAdapterFactory.create()).
                addConverterFactory(GsonConverterFactory.create())
                .baseUrl(ApiServer.GuoChuangYun_BaseUri)
                .build();


        apiServer.create(ApiServer.class)
                .getPOSTBodyGuoCHuangYunBean(app_key)// @body annotation upload
//.getPostGuochuangYunbean (stringHashMap)// @formurlencoded match @fieldMap
                .subscribeOn(Schedulers.io())/ / IO thread
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<GuoChuangYunBean>() {
                    @Override
                    public void onSubscribe(Disposable d) {}@Override
                    public void onNext(GuoChuangYunBean guoChuangYunBean) {
                      
                        Log.i("szjPOSTonNext"."\n"+guoChuangYunBean.toString());
                        mTv.setText("POST interface: \ n" + guoChuangYunBean.toString());
                    }

                    @Override
                    public void onError(Throwable e) {

                        mTv.setText("POST interface request error :\n" + e.getMessage());
                    }

                    @Override
                    public void onComplete(a) {}});Copy the code

Open the local album and select a picture to upload the picture

Open a local album. Apply for dynamic permission

		// Open the local album
        Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        intent.setType("image/png");
        intent.setAction(Intent.ACTION_PICK);
        startActivityForResult(intent, REQUEST_PICTURE_CHOOSE);
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Override the onActivityResult() method to get the selected image path and upload the image

	 @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_PICTURE_CHOOSE) {
            /** * select * from ** * where ** * from ** * /
            Uri selectedImage = data.getData(); // Get the Uri of the photo returned by the system
            String[] filePathColumn = {MediaStore.Images.Media.DATA};
            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null.null.null);// Query the photo corresponding to the specified Uri from the system table
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String path = cursor.getString(columnIndex);  // Get the photo path

            Log.i("szjpath"."\t\t" + path);
			// Upload the imageinitUpdata(path); }}Copy the code

Define the interface and set the request parameters:

public interface ApiServer {

		public static String GuoChuangYun_BaseUri = "http://hn216.api.yesapi.cn/";
		
	/ * * * *@paramBody Upload picture *@return* /
	// @multiPart Note: @multipart is used in conjunction with @Part or @partmap.!!!!!!! cannot be used alone
    @POST("? s=App.CDN.UploadImg")
    Observable<ImageBean> getImageBean( @Body RequestBody file);

    / * * \ * *@paramBody Upload app_key *@paramFile Single image uploaded *@return* /
    @Multipart
    @POST("? s=App.CDN.UploadImg")
    Observable<ImageBean> uploadFile(@Part("app_key") RequestBody body, @Part MultipartBody.Part file);

}
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Fetch the data from Postman and fetch the entity class from GsonFragment.

File file = new File(path);

// Method 1:
        RequestBody requestBody = new MultipartBody.Builder().
                setType(MultipartBody.FORM)
                .addFormDataPart("app_key"."74D2E724FE2B69EF7EA3F38E9400CF71")
                .addFormDataPart("file", file.getName(), RequestBody.create(MediaType.parse("image/png"), file))
                .build();
                
// Method 2:
RequestBody fileRQ = RequestBody.create(MediaType.parse("image/png"), file);
        MultipartBody.Part part = MultipartBody.Part.createFormData("file", file.getName(), fileRQ);
        RequestBody fb =RequestBody.create(MediaType.parse("text/plain"), "74D2E724FE2B69EF7EA3F38E9400CF71");


Retrofit apiServer = new Retrofit.Builder().
                addCallAdapterFactory(RxJava2CallAdapterFactory.create()).
                addConverterFactory(GsonConverterFactory.create())
                .baseUrl(ApiServer.GuoChuangYun_BaseUri)
                .build();
        apiServer.create(ApiServer.class)
//.getimageBean (requestBody) // @body image + parameter upload simultaneously
                .uploadFile(requestBody,part)   // @multipart uploads a single image and a single parameter with @Part
                .subscribeOn(Schedulers.io())/ / IO thread
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<ImageBean>() {
                    @Override
                    public void onSubscribe(Disposable d) {}@Override
                    public void onNext(ImageBean imageBean) {
                        String url = imageBean.getData().getUrl();
                        Glide.with(RetrofitActivity.this)
                                .load(url)
                                .apply(new RequestOptions().placeholder(R.mipmap.ic_launcher))
                                .into(mImage);
                        mTv.setText("Image uploaded successfully :\n" + imageBean.toString());
                        Log.i("szjOnNext", imageBean.toString());
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.i("onError", e.getMessage());
                        mTv.setText("Failed to upload picture :\n" + e.getMessage());
                    }

                    @Override
                    public void onComplete(a) {}});Copy the code

I opened my album and uploaded a photo of my workout. Here’s the Kangkang effect:

Ha ha ha ha ha ha, the ugly, but also strange embarrassed, shy QvQ

@ Url using:

public interface ApiServer {
	 @GET
    Observable<MeiNvBean> getUrlMeiNvBean(@Url String url);

}


@UrlRetrofit apiServer =? Retrofit apiServer =new Retrofit.Builder().
                addCallAdapterFactory(RxJava2CallAdapterFactory.create()).
                addConverterFactory(GsonConverterFactory.create())
                .baseUrl(ApiServer.BaseUri)
                .build();

        apiServer.create(ApiServer.class).getUrlMeiNvBean(ApiServer.BaseUri+"8/1")
                .subscribeOn(Schedulers.io())/ / IO thread
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<MeiNvBean>() {
                    @Override
                    public void onSubscribe(Disposable d) {}@Override
                    public void onNext(MeiNvBean meiNvBean) {
                        mTv.setText(meiNvBean.toString());
                        Log.i("szjonNex", meiNvBean.toString());
                    }

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

                    @Override
                    public void onComplete(a) {}});Copy the code