警报通知立即触发。安卓系统

本文介绍了警报通知立即触发。安卓系统的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在研究一种在固定时间向用户发送通知的提醒。

I am working on a Reminder that sends notification on fixed time to the user.

警报立即响起...

我尝试过 stackoverflow 的大多数建议，但仍然遇到相同的问题

I tried most of the suggestions over stackoverflow, but still having same issue

请帮助我解决此问题。

服务器数据

user_reminder": [ { "id": "75", "name": "Morning Snacks", "time": "11:00:00", "days": "1,2,3,4,5,6,7", "user_id": "14" }, { "id": "76", "name": "Lunch", "time": "13:00:00", "days": "1,2,3,4,5,6,7", "user_id": "14" }, ...... ]

我的代码

for (int i = 0; i < reminderList.size(); i++) { String time = reminderList.get(i).getTime(); // "time": "11:00:00" String strSpit[] = time.split(":"); String strDays[] = reminderList.get(i).getDays().split(","); //"days": "1,2,3,4,5,6,7" Date date = new Date(); Calendar calNow = Calendar.getInstance(); calNow.setTime(date); Calendar calAlarm = Calendar.getInstance(); calAlarm.set(Calendar.HOUR_OF_DAY, Integer.parseInt(strSpit[0])); calAlarm.set(Calendar.MINUTE, Integer.parseInt(strSpit[1])); for (int j = 0; j < strDays.length; j++) { calAlarm.set(Calendar.DAY_OF_WEEK, viewFunctions.getDayInt(strDays[j])); if (calAlarm.before(calNow)) { //if its in the past increment calAlarm.add(Calendar.DATE, 1); } notifyIntent.putExtra(Constants.REMINDER_NAME, reminderList.get(i).getName()); pendingIntent = PendingIntent.getBroadcast(this, 0, notifyIntent, PendingIntent.FLAG_ONE_SHOT); alarmManager.set(AlarmManager.RTC_WAKEUP, calAlarm.getTimeInMillis() , pendingIntent); } } }

获取天数：解决日期编号

public int getDayInt(String strDay) { int dayNumber = 0; if (strDay.equals("1")) { dayNumber = Calendar.MONDAY; } ...... return dayNumber; }

屏幕截图

推荐答案

最后，我找到了一种方法为此，将 PendingIntent requestCode 存储在数据库（使用的ROOM）中，然后通过检索所有 requestCode 取消所有警报来自 DB

Finally I found a way to do that by storing PendingIntent requestCode in database (used ROOM) , then cancelling all the alarm by retrieving all the requestCode from DB

AlarmIdPojo

@Entity public class AlarmIdPojo { @PrimaryKey(autoGenerate = true) public int id; private int requestCode; public AlarmIdPojo() { } public int getRequestCode() { return requestCode; } public void setRequestCode(int requestCode) { this.requestCode = requestCode; } }

AlarmIdDAO

@Dao public interface AlarmIdDAO { @Query("select * from AlarmIdPojo") List<AlarmIdPojo> getAllRequestCode(); @Query("delete from AlarmIdPojo") public void deleteAllRequestCode(); @Insert(onConflict = REPLACE) void addRequestCode(AlarmIdPojo pojo); }

AppDatabase

@Database(entities = {AlarmIdPojo.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { public abstract AlarmIdDAO requestIdPojo(); @Override protected SupportSQLiteOpenHelper createOpenHelper(DatabaseConfiguration config) { return null; } @Override protected InvalidationTracker createInvalidationTracker() { return null; } }

callReminder

private void callReminder() { // java.lang.IllegalStateException: Cannot access database on the main thread since it may potentially lock the UI for a long period of time. // because of this Exception , we are doing this in AsyncTask new AsyncTask<Void, Void, Void>() { @Override protected Void doInBackground(Void... voids) { List<AlarmIdPojo> idList = appDatabase.requestIdPojo().getAllRequestCode(); Intent notifyIntent = new Intent(MainActivity.this, MyReceiver.class); AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); PendingIntent pendingIntent; for (int i = 0; i < idList.size(); i++) { int requestId = idList.get(i).getRequestCode(); pendingIntent = PendingIntent.getBroadcast(MainActivity.this, requestId, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT); // Cancel alarms try { alarmManager.cancel(pendingIntent); } catch (Exception e) { Log.e(TAG, "AlarmManager update was not canceled. " + e.toString()); } } appDatabase.requestIdPojo().deleteAllRequestCode(); return null; } @Override protected void onPostExecute(Void aVoid) { super.onPostExecute(aVoid); // Once every request code is deleted , then once again call setReminderNotification() for fresh data. setReminderNotification(); } }.execute(); }

setReminderNotification

private void setReminderNotification() { Intent notifyIntent = new Intent(this, MyReceiver.class); AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); PendingIntent pendingIntent; // Taking existing offline reminder data from sharePreference Type type = new TypeToken<List<UserReminderPojo>>() { }.getType(); List<UserReminderPojo> reminderList = new Gson().fromJson(sharedPrefUtils.getString(sharedPrefUtils.DEFAULT_REMINDERS), type); for (int i = 0; i < reminderList.size(); i++) { String time = reminderList.get(i).getTime(); String strSpit[] = time.split(":"); String strDays[] = reminderList.get(i).getDays().split(","); Calendar todayWithTime = Calendar.getInstance(); todayWithTime.set(Calendar.SECOND, 0); todayWithTime.set(Calendar.MILLISECOND, 0); for (int j = 0; j < strDays.length; j++) { Calendar alarm = Calendar.getInstance(); alarm.set(Calendar.SECOND, 0); alarm.set(Calendar.MILLISECOND, 0); alarm.set(Calendar.HOUR_OF_DAY, Integer.parseInt(strSpit[0])); alarm.set(Calendar.MINUTE, Integer.parseInt(strSpit[1])); alarm.set(Calendar.DAY_OF_WEEK, viewFunctions.getDayInt(strDays[j])); int randomPendingIntentId = generateRandomId(); notifyIntent.putExtra(Constants.REMINDER_NAME, reminderList.get(i).getName()); notifyIntent.putExtra(Constants.ID, randomPendingIntentId); // passing it , so that we can cancel this PendingIntent with this Id, once notification is shown.This is done to prevent past time alarm firing notifyIntent.putExtra(Constants.REMINDER_DAY, viewFunctions.getDayInt(strDays[j])); pendingIntent = PendingIntent.getBroadcast(this, randomPendingIntentId, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT); if (alarm.before(todayWithTime)) { alarm.add(Calendar.DATE, 7); } alarmManager.set(AlarmManager.RTC_WAKEUP, alarm.getTimeInMillis(), pendingIntent); insertToDB(randomPendingIntentId); } } }

insertToDB

// Saving to DB. keeping track of PendingIntent unique id. private void insertToDB(int randomPendingIntentId) { alarmIdPojo = new AlarmIdPojo(); alarmIdPojo.setRequestCode(randomPendingIntentId); // java.lang.IllegalStateException: Cannot access database on the main thread since it may potentially lock the UI for a long period of time. // because of this Exception , we are doing this in AsyncTask new AsyncTask<Void, Void, Void>() { @Override protected Void doInBackground(Void... voids) { appDatabase.requestIdPojo().addRequestCode(alarmIdPojo); return null; } }.execute(); }