VolleyErrorHelper.java

package net.kornan.framework.network;

import android.content.Context;
import android.content.res.Resources;

import com.android.volley.AuthFailureError;
import com.android.volley.NetworkError;
import com.android.volley.NetworkResponse;
import com.android.volley.NoConnectionError;
import com.android.volley.ServerError;
import com.android.volley.TimeoutError;
import com.android.volley.VolleyError;

public class VolleyErrorHelper {
	/**
	 * Returns appropriate message which is to be displayed to the user against
	 * the specified error object.
	 * 
	 * @param error
	 * @param context
	 * @return
	 */
	public static String getMessage(Object error, Context context) {
		Resources res=context.getResources();
		if (error instanceof TimeoutError) {
			
			return res.getString(res.getIdentifier("generic_server_down","string",context.getPackageName()));
			
//			return context.getResources().getString(
//					R.string.generic_server_down);
		} else if (isServerProblem(error)) {
			return handleServerError(error, context);
		} else if (isNetworkProblem(error)) {
//			return context.getResources().getString(R.string.no_internet);
			String packageName=context.getPackageName();
			int resId=res.getIdentifier("no_internet","string",packageName);
			return res.getString(resId); 
		}
		return res.getString(res.getIdentifier("generic_error","string",context.getPackageName())); 
//		return context.getResources().getString(R.string.generic_error);
	}

	/**
	 * Determines whether the error is related to network
	 * 
	 * @param error
	 * @return
	 */
	private static boolean isNetworkProblem(Object error) {
		return (error instanceof NetworkError)
				|| (error instanceof NoConnectionError);
	}

	/**
	 * Determines whether the error is related to server
	 * 
	 * @param error
	 * @return
	 */
	private static boolean isServerProblem(Object error) {
		return (error instanceof ServerError)
				|| (error instanceof AuthFailureError);
	}

	/**
	 * Handles the server error, tries to determine whether to show a stock
	 * message or to show a message retrieved from the server.
	 * 
	 * @param err
	 * @param context
	 * @return
	 */
	private static String handleServerError(Object err, Context context) {
		Resources res=context.getResources();
		VolleyError error = (VolleyError) err;
		NetworkResponse response = error.networkResponse;
		if (response != null) {
			switch (response.statusCode) {
			case 404:
			case 422:
			case 401:
//				try {
					// server might return error like this { "error":
					// "Some error occured" }
					// Use "Gson" to parse the result
//					HashMap<String, String> result = new Gson().fromJson(
//							new String(response.data),
//							new TypeToken<Map<String, String>>() {
//							}.getType());
//					if (result != null && result.containsKey("error")) {
//						return result.get("error");
//					}
//				} catch (Exception e) {
//					e.printStackTrace();
//				}
				// invalid request
				return error.getMessage();
			default:
//				return context.getResources().getString(R.string.generic_server_down);
				return res.getString(res.getIdentifier("generic_server_down", "string", context.getPackageName()));
			}
		}
		return res.getString(res.getIdentifier("generic_error", "string", context.getPackageName()));
//		return context.getResources().getString(R.string.generic_error);
	}
}