处理Volley错误

Question

我想处理并显示一些消息 onErrorResponse

下面是我的代码.

String url = MainActivity.strHostUrl+"api/delete_picture"; 
jobjDeleteImage = new JsonObjectRequest(Request.Method.POST, url, jobj, new Response.Listener<JSONObject>() {

    @Override
    public void onResponse(JSONObject response) {
        Log.e("Image response", response.toString());


    }
},  new Response.ErrorListener() {

    @Override
    public void onErrorResponse(VolleyError error) {

        Log.e("Volly Error", error.toString());

        NetworkResponse networkResponse = error.networkResponse;
        if (networkResponse != null) {
            Log.e("Status code", String.valueOf(networkResponse.statusCode));
        }
    }
});

我想处理com.android.volley.TimeoutError和其他一些错误代码,如404,503等和Toast消息在这里.

Answer 1

networkResponse为null,因为在TimeoutError中没有从服务器接收数据 - 因此超时.相反,当发生其中一个事件时,您需要显示通用客户端字符串.您可以使用instanceof检查VolleyError的类型,以区分错误类型,因为您没有可以使用的网络响应 - 例如:

@Override
public void onErrorResponse(VolleyError error) {

    if (error instanceof TimeoutError || error instanceof NoConnectionError) {
        Toast.makeText(context,
                context.getString(R.string.error_network_timeout),
                Toast.LENGTH_LONG).show();
    } else if (error instanceof AuthFailureError) {
        //TODO
    } else if (error instanceof ServerError) {
       //TODO
    } else if (error instanceof NetworkError) {
      //TODO
    } else if (error instanceof ParseError) {
       //TODO
    }
}

Answer 2

这就是我在我的项目中使用的。

        @Override
        public void onErrorResponse(VolleyError error) {
            if(error instanceof NoConnectionError){
                ConnectivityManager cm = (ConnectivityManager)mContext
                        .getSystemService(Context.CONNECTIVITY_SERVICE);
                NetworkInfo activeNetwork = null;
                if (cm != null) {
                    activeNetwork = cm.getActiveNetworkInfo();
                }
                if(activeNetwork != null && activeNetwork.isConnectedOrConnecting()){
                    Toast.makeText(getActivity(), "Server is not connected to internet.",
                            Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(getActivity(), "Your device is not connected to internet.",
                            Toast.LENGTH_SHORT).show();
                }
            } else if (error instanceof NetworkError || error.getCause() instanceof ConnectException 
                    || (error.getCause().getMessage() != null 
                    && error.getCause().getMessage().contains("connection"))){
                Toast.makeText(getActivity(), "Your device is not connected to internet.", 
                        Toast.LENGTH_SHORT).show();
            } else if (error.getCause() instanceof MalformedURLException){
                Toast.makeText(getActivity(), "Bad Request.", Toast.LENGTH_SHORT).show();
            } else if (error instanceof ParseError || error.getCause() instanceof IllegalStateException
                    || error.getCause() instanceof JSONException
                    || error.getCause() instanceof XmlPullParserException){
                Toast.makeText(getActivity(), "Parse Error (because of invalid json or xml).", 
                        Toast.LENGTH_SHORT).show();
            } else if (error.getCause() instanceof OutOfMemoryError){
                Toast.makeText(getActivity(), "Out Of Memory Error.", Toast.LENGTH_SHORT).show();
            }else if (error instanceof AuthFailureError){
                Toast.makeText(getActivity(), "server couldn't find the authenticated request.", 
                        Toast.LENGTH_SHORT).show();
            } else if (error instanceof ServerError || error.getCause() instanceof ServerError) {
                Toast.makeText(getActivity(), "Server is not responding.", Toast.LENGTH_SHORT).show();
            }else if (error instanceof TimeoutError || error.getCause() instanceof SocketTimeoutException
                    || error.getCause() instanceof ConnectTimeoutException 
                    || error.getCause() instanceof SocketException
                    || (error.getCause().getMessage() != null 
                    && error.getCause().getMessage().contains("Connection timed out"))) {
                Toast.makeText(getActivity(), "Connection timeout error", 
                        Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(getActivity(), "An unknown error occurred.", 
                        Toast.LENGTH_SHORT).show();
            }
        }