您好，我已经在 Android 中完成了一个进程，该进程将调用包含日历事件的网络服务。我已成功解析事件并将其添加到 android 日历中。我使用 asynctask 来做到这一点。但是现在即使应用程序处于最小化状态，这个过程也必须每 30 秒运行一次。我上网发现我们可以使用thread,aynstask,service,alarm receiver来实现。但我对这些事情一无所知。如果有人知道，请帮助我。
我的异步任务:
public class SyncCalendar extends AsyncTask<String, Void, String> {
@Override
protected void onPreExecute() {
progressdialog = new ProgressDialog(MainActivity.this);
progressdialog.setCancelable(true);
progressdialog.setMessage("Fetching Appointments and Tasks...");
progressdialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressdialog.setProgress(0);
progressdialog.show();
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
String taskresult = getCalendarData();
Log.d("test", "" + taskresult);
return taskresult;
}
protected void onPostExecute(String taskresult) {
if (taskresult != "" && taskresult != null) {
try {
if (response.contains("Appointment")) {
Log.e("called", "called");
try {
leadna_leadAppointaray = leadna_leadSyncCalendar
.getJSONArray("Appointment");
if(leadna_leadAppointaray.length()!=0){
for (int i = 0; i < leadna_leadAppointaray
.length(); i++) {
Log.e("called", "called"+i);
JSONObject c = leadna_leadAppointaray
.getJSONObject(i);
String startDate = c.getString("StartDate");
String[] startDatearay = startDate.split("\\-");
String endDate = c.getString("EndDate");
String[] endDatearay = endDate.split("\\-");
String startTime = c.getString("StartTime");
String[] startTimearay = startTime.split("\\:");
String endTimeData = c.getString("EndTime");
String[] endTimearay = endTimeData.split("\\:");
long calID = 1;
long startMillis = 0;
long endMillis = 0;
Calendar beginTime = Calendar.getInstance();
beginTime.set(
Integer.parseInt(startDatearay[0]),
Integer.parseInt(startDatearay[1]),
Integer.parseInt(startDatearay[2]),
Integer.parseInt(startTimearay[0]),
Integer.parseInt(startTimearay[1]));
startMillis = beginTime.getTimeInMillis();
Calendar endTime = Calendar.getInstance();
endTime.set(Integer.parseInt(endDatearay[0]),
Integer.parseInt(endDatearay[1]),
Integer.parseInt(endDatearay[2]),
Integer.parseInt(endTimearay[0]),
Integer.parseInt(endTimearay[1]));
endMillis = endTime.getTimeInMillis();
ContentResolver cr = getContentResolver();
ContentValues values = new ContentValues();
SimpleDateFormat formatter = new SimpleDateFormat(
"dd/MM/yyyy");
String dateString = formatter.format(new Date(
startMillis));
String edateString = formatter.format(new Date(
startMillis));
Log.e("Date", dateString);
Log.e("EDate", edateString);
values.put(Events.DTSTART, startMillis);
values.put(Events.DTEND, endMillis);
values.put(Events.TITLE, c.getString("Subject"));
values.put(Events.DESCRIPTION,
c.getString("Descrip"));
values.put(Events.EVENT_LOCATION,
c.getString("Location"));
values.put(Events.CALENDAR_ID, calID);
values.put(Events.EVENT_TIMEZONE,
"America/Los_Angeles");
Uri uri = cr.insert(Events.CONTENT_URI, values);
Log.e("called", "called");
}
}
leadna_leadTaskaray = leadna_leadSyncCalendar
.getJSONArray("Task");
if(leadna_leadTaskaray.length()!=0){
for (int i = 0; i < leadna_leadTaskaray
.length(); i++) {
Log.e("called", "called"+i);
JSONObject c = leadna_leadTaskaray
.getJSONObject(i);
String taskDateTime = c.getString("task_date");
SimpleDateFormat formatter1 = new SimpleDateFormat("yyyy-MM-dd hh:mm"); // I assume d-M, you may refer to M-d for month-day instead.
Date date = formatter1.parse(taskDateTime); // You will need try/catch around this
long millis = date.getTime();
Log.e("taskDateTime",String.valueOf(millis));
long calID = 1;
long startMillis = 0;
long endMillis = 0;
Calendar beginTime = Calendar.getInstance();
//beginTime.set();
startMillis = millis;
Calendar endTime = Calendar.getInstance();
/*endTime.set(Integer.parseInt(Date[0]),
Integer.parseInt(Date[1]),
Integer.parseInt(Date[2]),
Integer.parseInt(Time[0]),
Integer.parseInt(Time[1]));*/
endMillis = millis;
ContentResolver cr = getContentResolver();
ContentValues values = new ContentValues();
SimpleDateFormat formatter = new SimpleDateFormat(
"dd/MM/yyyy");
String dateString = formatter.format(new Date(
startMillis));
String edateString = formatter.format(new Date(
startMillis));
Log.e("Date", dateString);
Log.e("EDate", edateString);
values.put(Events.DTSTART, startMillis);
values.put(Events.DTEND, endMillis);
values.put(Events.TITLE, c.getString("task_title"));
values.put(Events.DESCRIPTION,c.getString("task_note"));
values.put(Events.CALENDAR_ID, calID);
values.put(Events.EVENT_TIMEZONE,
"America/Los_Angeles");
Uri uri = cr.insert(Events.CONTENT_URI, values);
Log.e("called", "called");
}
}
progressdialog.cancel();
} catch (Exception e) {
}
}
} catch (Exception e) {
}
}
}
public String getCalendarData() {
Date date1 = new Date();
SimpleDateFormat postFormater = new SimpleDateFormat("yyyy-MM-dd");
String toDate = postFormater.format(date1);
URLSyncCalendar = URLSyncCalendar + "&today=" + toDate
+ "&userId=" + LoginActivity.user_id + "&clientId="
+ LoginActivity.user_client_id;
System.out.println("URL-->>" + URLSyncCalendar);
try {
BufferedReader inStream = null;
OutputStream out = null;
HttpURLConnection httpconn = null;
URI uri = new URI(URLSyncCalendar);
URL url = uri.toURL();
httpconn = (HttpURLConnection) url.openConnection();
httpconn.setDoOutput(true);
out = httpconn.getOutputStream();
httpconn.connect();
out.flush();
inStream = new BufferedReader(new InputStreamReader(
httpconn.getInputStream()));
if ((response = inStream.readLine()) != null) {
try {
leadna_leadSyncCalendar = new JSONObject(response);
} catch (JSONException e1) { // TODO Auto-generated catch //
// block
e1.printStackTrace();
}
}
out.close();
httpconn.disconnect();
} catch (Exception e) {
}
return response;
}
}
最佳答案
你绝对应该使用 Service为了这。 不过还有一件事。永远不要每 30 秒向服务器发送一次请求。想象一下，每 30 秒有 100 万个客户端应用程序发送请求。或者，一台设备上安装了 50 个应用程序。讲道理。
关于android - 即使在应用程序最小化状态下，如何始终运行 asynctask？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24145705/