How to handle error in Retrofit 2.0

Question

I want to handle error in Retrofit 2.0

Got e.g. code=404 and body=null, but errorBody() contains data in ErrorModel (Boolean status and String info).

This is errorBody().content: [text=\n{"status":false,"info":"Provided email doesn't exist."}].

How can I get this data?

Thank for helping me!

This is my code for Retrofit request:

ResetPasswordApi.Factory.getInstance().resetPassword(loginEditText.getText().toString())
    .enqueue(new Callback<StatusInfoModel>() {
        @Override
        public void onResponse(Call<StatusInfoModel> call, Response<StatusInfoModel> response) {
            if (response.isSuccessful()) {
                showToast(getApplicationContext(), getString(R.string.new_password_sent));
            } else {
                showToast(getApplicationContext(), getString(R.string.email_not_exist));
            }
        }

        @Override
        public void onFailure(Call<StatusInfoModel> call, Throwable t) {
            showToast(getApplicationContext(), "Something went wrong...");
        }
    });

Answer 1

If you want to get data when error response comes (typically a response code except 200) you can do it like that in your onResponse() method:

if (response.code() == 404) {
    Gson gson = new GsonBuilder().create();
    YourErrorPojo pojo = new YourErrorPojo();
    try {
         pojo = gson.fromJson(response.errorBody().string(), YourErrorPojo.class);
         Toast.makeText(context, pojo.getInfo(), Toast.LENGTH_LONG).show();
    } catch (IOException e) { 
      // handle failure at error parse 
  }
}

When generating YourErrorPojo.class do following steps :

1. Go to Json Schema 2 Pojo

2. Paste your example Json, and select source type Json , annotation Gson

3. Your example Json is : {"status":false,"info":"Provided email doesn't exist."}

4. Click Preview and it will generate your Pojo class for you.

Add this to your build.gradle : compile 'com.google.code.gson:gson:2.7'

I used Gson in this solution but you can get your Json string using: response.errorBody().string()

Answer 2

Retrofit doesn't see 404 as a failure, so it will enter the onSuccess.

response.isSuccessful() is true if the response code is in the range of 200-300, so it will enter the else there.

if (response.isSuccessful()) {
    showToast(getApplicationContext(), getString(R.string.new_password_sent));
} else {
    // A 404 will go here

    showToast(getApplicationContext(), getString(R.string.email_not_exist));
}

However since your response was not successful, you do not get the response body with .body(), but with errorBody(), errorBody will filled when the request was a success, but response.isSuccessful() returns false (so in case of a status code that is not 200-300).