Android 改造处理 onFailure() 响应

Question

我一直在开发 Android 应用程序，我正在使用 Retrofit。

如何处理 onFailure(Throwable t) 回调 NoInternetConnection 和 OtherError

我检查了一些关于 stackoverflow 的问题，但没有帮助，因为我正在使用 retrofit 2

compile 'com.squareup.retrofit2:retrofit:2.1.0'

回调代码

    public class AvsCallBack<T> implements Callback<T> {
        private static final String TAG = "AvsCallBack";
        private AvsCallbackInterface<T> avsInterface;
        private Activity activity;
        private boolean validateError = true;

        public AvsCallBack(Activity activity, AvsCallbackInterface<T> avsInterface) {
            this.activity = activity;
            this.avsInterface = avsInterface;
        }

        public AvsCallBack(Activity activity, AvsCallbackInterface<T> avsInterface, boolean validateError) {
            this.activity = activity;
            this.avsInterface = avsInterface;
            this.validateError = validateError;
        }

        @Override
        public void onResponse(Call<T> call, Response<T> response) {
            if (response.isSuccessful()) {
                if (BuildConfig.DEBUG) Log.d(TAG, new Gson().toJson(response.body()));
                avsInterface.onSuccess(call, response.body());
            } else {
                onFailure(call, null);
            }
        }

        @Override
        public void onFailure(Call<T> call, Throwable t) {
            if (validateError) {
                if (BuildConfig.DEBUG)
                    Log.d(TAG, "Retrofit Exception -> " + ((t != null && t.getMessage() != null) ? t.getMessage() : "---"));
                if (t != null && (t instanceof IOException || t instanceof SocketTimeoutException || t instanceof ConnectException)) {
                    if (t instanceof SocketTimeoutException || t instanceof TimeoutException) {
                        ((BaseActivity) activity).showToast("Oops something went wrong");
                        //avsInterface.onError(call, new AvsException("Oops something went wrong, please try again later..."));
                    } else {
                        ((BaseActivity) activity).showToast("Please check your internet connection...");
                        //avsInterface.onError(call, new AvsException("Please check your internet connection..."));
                    }
                } else {
                   ((BaseActivity) activity).showToast("Oops something went wrong");
                }
                if (BuildConfig.DEBUG)
                    Log.d(TAG, "Avs Exception -> " + ((t != null && t.getMessage() != null) ? t.getMessage() : "---"));
            }
            avsInterface.onError(call, t);
        }
    }

我的界面

public interface AvsCallbackInterface<T> {

    void onSuccess(Call<T> call, T t);

    void onError(Call<T> call, Throwable throwable);
}

Answer 1

引自 here :

When Throwable is passed to the failure, the callback is an IOException, this means that it was a network problem (socket timeout, unknown host, etc.). Any other exception means something broke either in serializing/deserializing the data or it's a configuration problem.

You can do t instanceof IOException to determine network problem and react appropriately.

A 401 (or any non-2xx response code) will actually go to the response callback, because it was a successful response even though it may not have been a successful operation on the server. You can check this in onResponse by calling response.isSuccess().