关于java：如何延迟函数调用？

How can I delay a funtion call?

本问题已经有最佳答案，请猛点这里访问。

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public class NotificationReceivedCheckDelivery extends NotificationExtenderService {
@Override
protected boolean onNotificationProcessing(OSNotificationReceivedResult receivedResult) {
OverrideSettings overrideSettings = new OverrideSettings();

overrideSettings.extender = new NotificationCompat.Extender() {
@Override
public NotificationCompat.Builder extend(NotificationCompat.Builder builder) {
// Sets the background notification color to Yellow on Android 5.0+ devices.
return builder.setColor(new BigInteger("FFFFEC4F", 16).intValue());
}
};

OSNotificationDisplayedResult displayedResult = displayNotification(overrideSettings);
Log.d("ONES",receivedResult.payload.title);
JSONObject AdditionalData = receivedResult.payload.additionalData;
Log.d("Adata",AdditionalData.toString());

String uuid= null;
try{
// {"uuid":"adddd"}
uuid = AdditionalData.getString("uuid");

}
catch (JSONException e){
Log.e("Error JSON","UUID",e);
}

// Create Object and call AsyncTask execute Method
new FetchNotificationData().execute(uuid);

return true;
}

private class FetchNotificationData extends AsyncTask<String,Void, String> {

@Override
protected String doInBackground(String... uuids) {
// These two need to be declared outside the try/catch
// so that they can be closed in the finally block.
HttpURLConnection urlConnection = null;
BufferedReader reader = null;

// Will contain the raw JSON response as a string.
String forecastJsonStr = null;

try {

URL url = new URL("http://test.com/AppDeliveryReport?uuid="+uuids[0]);

urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();

// Read the input stream into a String
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
// Nothing to do.
return null;
}
reader = new BufferedReader(new InputStreamReader(inputStream));

String line;
while ((line = reader.readLine()) != null) {
// Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
// But it does make debugging a *lot* easier if you print out the completed
// buffer for debugging.
buffer.append(line +"
");
}

if (buffer.length() == 0) {
// Stream was empty. No point in parsing.
return null;
}
forecastJsonStr = buffer.toString();
return forecastJsonStr;
} catch (IOException e) {
Log.e("PlaceholderFragment","Error", e);
// If the code didn't successfully get the weather data, there's no point in attemping
// to parse it.
return null;
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e("PlaceholderFragment","Error closing stream", e);
}
}
}

}

@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.i("json", s);
}
}
}

我想用随机秒延迟调用fetchnotificationdata函数。这是传递报告URL请求功能。只要应用程序收到来自OneSignal的通知，它就会调用URL。我不想用一个巨大的请求来炸毁服务器。所以我想用随机的秒延迟呼叫，这样服务器在给定的时间内就必须提供很少的呼叫。