在我使用 Volley 之前,和往常一样,我使用 AsyncTask 检查我的互联网状态。
这是我在 AsyncTask 中所做的:
private class NetCheck extends AsyncTask<String, Void, Boolean> {
@Override
protected Boolean doInBackground(String... args) {
// get Internet status
return cd.isConnectingToInternet();
}
protected void onPostExecute(Boolean th) {
if (th == true) {
new LoadCategories().execute();
} else {
Toast.makeText(CategoryActivity.this, "Unable to connect to server",
Toast.LENGTH_LONG).show();
}
}
}
这是isConnectingToInternet
函数:
public boolean isConnectingToInternet() {
ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo info = connectivity.getActiveNetworkInfo();
if (info != null && info.isConnected())
try {
URL url = new URL("http://www.google.com");
HttpURLConnection urlc = (HttpURLConnection) url
.openConnection();
urlc.setConnectTimeout(3000);
urlc.connect();
if (urlc.getResponseCode() == 200) {
return true;
}
} catch (MalformedURLException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return false;
}
如何使用 Volley 实现这一目标?
最佳答案
请求引发了 NoConnection 错误。请在
中捕获错误 @Override
public void onErrorResponse(VolleyError volleyError) {
String message = null;
if (volleyError instanceof NetworkError) {
message = "Cannot connect to Internet...Please check your connection!";
} else if (volleyError instanceof ServerError) {
message = "The server could not be found. Please try again after some time!!";
} else if (volleyError instanceof AuthFailureError) {
message = "Cannot connect to Internet...Please check your connection!";
} else if (volleyError instanceof ParseError) {
message = "Parsing error! Please try again after some time!!";
} else if (volleyError instanceof NoConnectionError) {
message = "Cannot connect to Internet...Please check your connection!";
} else if (volleyError instanceof TimeoutError) {
message = "Connection TimeOut! Please check your internet connection.";
}
}
关于java - Android Volley - 检查互联网状态,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21011279/