Marc Marc - 1 year ago 142
Android Question

"return response.body().string() " is empty with okhttp3

I created the following class:

package com.inverseo.marc.t372lematin;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class PostJSON {
public static final MediaType JSON
= MediaType.parse("application/json; charset=utf-8");

OkHttpClient client = new OkHttpClient();
public String postJSONRequest(String url, String json) throws IOException {
RequestBody body = RequestBody.create(JSON, json);
Request request = new Request.Builder()
Response response = client.newCall(request).execute();
System.out.println("postJSONRequest response.body : "+response.body().string());
return response.body().string() ;
} //postJSONRequete
} //class PostJSON

It used to work from an activity where I write some data to MySQL on a server.
And when I call it from the following piece of code, I get an empty response !

System.out.println("début appel "+getString(R.string.CF_URL)+"authentication2.php" );
PostJSON client2 = new PostJSON();
JSONObject obj = new JSONObject();
try {
obj.put("username", mUserName);
obj.put("password", mPassword);
obj.put("email", mEmail);
} catch (JSONException e) {
String response = null;
try {
response = client2.postJSONRequest(getString(R.string.CF_URL)+ "authentication2.php", obj.toString());
} catch (IOException e) {
System.out.println("appel d'authentication2.php échoué : " + e);
System.out.println("fin authentication2, response = "+response);
return response;

Here is what I get in logcat

02-25 05:52:24.938 26130-26226/com.inverseo.marc.t372lematin I/System.out: Accès à Internet : OK
02-25 05:52:24.938 26130-26226/com.inverseo.marc.t372lematin I/System.out: début appel
02-25 05:52:24.938 26130-26226/com.inverseo.marc.t372lematin I/System.out: obj.toString()={"email":"","password":"xxx","username":"MarcUser"}
02-25 05:52:25.068 26130-26130/com.inverseo.marc.t372lematin I/Choreographer: Skipped 30 frames! The application may be doing too much work on its main thread.
02-25 05:52:25.448 26130-26130/com.inverseo.marc.t372lematin I/Choreographer: Skipped 34 frames! The application may be doing too much work on its main thread.
02-25 05:52:27.898 26130-26226/com.inverseo.marc.t372lematin I/System.out: postJSONRequest response.body : {"result":1,"message":"AUTHENTICATION OK","Id_profile":"1394","DebutDerCycle":"2016-01-31"}
02-25 05:52:27.898 26130-26226/com.inverseo.marc.t372lematin I/System.out: fin authentication2, response =
02-25 05:52:28.588 26130-26130/com.inverseo.marc.t372lematin I/Choreographer: Skipped 140 frames! The application may be doing too much work on its main thread.

So to wrap it up, in my PostJSON class, I write the correct result to System.out. Then return it. But the response is then empty.
I can't figure out why.

Answer Source

I found a solution which sounds weird, at least to me.

I changed the end of the class as following:

String MyResult = response.body().string();
System.out.println("postJSONRequest response.body : "+MyResult);
return MyResult ;

So instead of calling twice response.body().string(), I put it in a variable. And it works !