响应为JSON（Retrofit + Android + PHP Slim Framework）

Question

I'm using PHP Slim framework to build REST API for Android application.

I post body in app, it works well and add data to MySQL. But I have trouble in response.

My response JSON Model is simply;

{success:'yes'}

When I try to get response after data added, Retrofit works onFailure method. but adding data works well. I don't know where I missed. Here are my codes;

PHP Slim Framework File

$response->withHeader('Content-Type', 'application/json');
    $response->getBody()->write("{success:'yes'}");
    return $response;

} catch (PDOException $e) {
    echo '{"error": {"text": ' . $e->getMessage() . '}';
}

Android Response Model

public class Response_Success {

@SerializedName("success")
@Expose
String success;

public Response_Success(String success) {
    this.success = success;
}

public String getSuccess() {
    return success;
}

public void setSuccess(String success) {
    this.success = success;
}

Interface Class

public interface API_Service {
@Headers("content-type: application/json")
@POST("api/user/add")
Call<Response_Success> addFacebookUser(@Body UserFacebook userFacebook);}

API Call in MainActivity

API_Service service = Client.getRetrofitInstance().create(API_Service.class);

        Call<Response_Success> userFacebookCall = service.addFacebookUser(userNew);

        userFacebookCall.enqueue(new Callback<Response_Success>() {
            @Override
            public void onResponse(Call<Response_Success> call, Response<Response_Success> response) {
                Toast.makeText(MainActivity.this, ""+response.body().getSuccess(), Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onFailure(Call<Response_Success> call, Throwable t) {
                Toast.makeText(MainActivity.this, "was wrong", Toast.LENGTH_SHORT).show();
            }
        });

Debug mode in android studio; I get MaltFormedJsonException, but I added that exception in try catch.

Answer 1

Your Json response

{success:'yes'}

is invalid. The key and (string) value must be in double quotes.

Either make sure your response is in double quotes:

{"success":"yes"}

or try this instead:

$response = array();
$response["success"] = "yes";
echo json_encode($response);

Note: you can check to see if any JSON string is valid at: https://jsonlint.com/ Or https://jsonformatter.curiousconcept.com/