Volley. Use cache if there is no internet connection.

gistfile1.java

public class MyStringRequest extends StringRequest{
    public MyStringRequest(int method, String url, Response.Listener<String> listener, Response.ErrorListener errorListener) {
        super(method, url, listener, errorListener);
    }

    @Override
    public void deliverError(VolleyError error) {
        if (error instanceof NoConnectionError) {
            Cache.Entry entry = this.getCacheEntry();
            if(entry != null) {
                Response<String> response = parseNetworkResponse(new NetworkResponse(entry.data, entry.responseHeaders));
                deliverResponse(response.result);
                return;
            }
        }
        super.deliverError(error);
    }
}

Thank you very much.

Thanq so much..

Without deprecated methods:

import com.android.volley.*;
import com.android.volley.toolbox.StringRequest;

import java.net.HttpURLConnection;

public class MyStringRequest extends StringRequest {

    public MyStringRequest(int method, String url, Response.Listener<String> listener, Response.ErrorListener errorListener) {
        super(method, url, listener, errorListener);
    }

    @Override
    public void deliverError(VolleyError error) {
        if (error instanceof NoConnectionError) {
            Cache.Entry entry = this.getCacheEntry();
            if(entry != null) {
                Response<String> response = parseNetworkResponse(new NetworkResponse(HttpURLConnection.HTTP_OK,
                        entry.data, false, 0, entry.allResponseHeaders));
                deliverResponse(response.result);
                return;
            }
        }
        super.deliverError(error);
    }
}