获取 java.net. SocketTimeoutException: 在 android 中连接超时

I've searched all over the web and after reading lot of docs regarding connection timeout exception, the thing I understood is that, preventing SocketTimeoutException is beyond our limit. One way to effectively handle it is to define a connection timeout and later handle it by using a try-catch block. Hope this will help anyone in future who are facing the same issue.

HttpUrlConnection conn = (HttpURLConnection) url.openConnection();


//set the timeout in milliseconds
conn.setConnectTimeout(7000);

public JSONObject RequestWithHttpUrlConn(String _url, String param){


HttpURLConnection con = null;
URL url;
String response = "";
Scanner inStream = null;
PrintWriter out = null;
try {
url = new URL(_url);
con = (HttpURLConnection) url.openConnection();
con.setDoOutput(true);
con.setRequestMethod("POST");
if(param != null){
con.setFixedLengthStreamingMode(param.getBytes().length);
}
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
out = new PrintWriter(con.getOutputStream());
if(param != null){
out.print(param);
}
out.flush();
out.close();
inStream = new Scanner(con.getInputStream());


while(inStream.hasNextLine()){
response+=(inStream.nextLine());
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
if(con != null){
con.disconnect();
}if(inStream != null){
inStream.close();
}if(out != null){
out.flush();
out.close();
}
}
}

I'm aware this question is a bit old. But since I stumbled on this while doing research, I thought a little addition might be helpful.

As stated the error cannot be solved by the client, since it is a network related issue. However, what you can do is retry connecting a few times. This may work as a workaround until the real issue is fixed.

for (int retries = 0; retries < 3; retries++) {
try {
final HttpClient client = createHttpClientWithDefaultSocketFactory(null, null);
final HttpResponse response = client.execute(get);
final int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200) {
throw new IllegalStateException("GET Request on '" + get.getURI().toString() + "' resulted in " + statusCode);
} else {
return response.getEntity();
}
} catch (final java.net.SocketTimeoutException e) {
// connection timed out...let's try again
}
}

Maybe this helps someone.

If you are testing the server in localhost your Android device must be connected to the same local network. Then the Server URL used by your APP must include your computer IP Address and not the "localhost" mask.

I was facing this problem and the solution was to restart my modem (router). I could get connection for my app to internet after that.

I think the library I am using is not managing connections properly because it happeend just few times.

I got this same error as I mistakenly changed the order of the statements

OkHttpClient okHttpClient = new OkHttpClient().newBuilder() .connectTimeout(20, TimeUnit.SECONDS).readTimeout(20,TimeUnit.SECONDS).writeTimeout(20, TimeUnit.SECONDS) .build();

After changing the order of writeTimeout and readTimeout, the error resolved. The final code I used is given below:

OkHttpClient okHttpClient = new OkHttpClient.Builder().connectTimeout(60, TimeUnit.SECONDS)
.writeTimeout(60, TimeUnit.SECONDS)
.readTimeout(60, TimeUnit.SECONDS)
.build();

Set This in OkHttpClient.Builder() Object

val httpClient = OkHttpClient.Builder()
httpClient.connectTimeout(5, TimeUnit.MINUTES) // connect timeout
.writeTimeout(5, TimeUnit.MINUTES) // write timeout
.readTimeout(5, TimeUnit.MINUTES) // read timeout

If you are using Kotlin + Retrofit + Coroutines then just use try and catch for network operations like,

viewModelScope.launch(Dispatchers.IO) {
try {
val userListResponseModel = apiEndPointsInterface.usersList()
returnusersList(userListResponseModel)
} catch (e: Exception) {
e.printStackTrace()
}
}

Where, Exception is type of kotlin and not of java.lang

This will handle every exception like,

1. HttpException
2. SocketTimeoutException
3. FATAL EXCEPTION: DefaultDispatcher etc

Here is my usersList() function

@GET(AppConstants.APIEndPoints.HOME_CONTENT)
suspend fun usersList(): UserListResponseModel

Note: Your RetrofitClient Classs must have this as client

OkHttpClient.Builder()
.connectTimeout(10, TimeUnit.SECONDS)
.readTimeout(10, TimeUnit.SECONDS)
.writeTimeout(10, TimeUnit.SECONDS)

I faced the same problem when connecting to EC2, the issue was with Security Group, I solved by adding the allowed IPs at port 5432

For me, I just restarted my application and it has gone. If you are using emulator, try restarting it. If your are using physical device then check for internet connection. Give it a try!