[英]Android Alarm Manager - alarm firing on random time
我是android中的一个新手,目前正在调度程序应用程序上工作。这是我使用SQLite db值设置警报的代码。 我的问题是警报是在随机时间触发的。
公共无效startAlarm()引发ParseException {
Date dt = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("hh:mm a");
String time = sdf.format(dt);
String start_time;
Calendar sCalendar = Calendar.getInstance();
String dayLongName = sCalendar.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.getDefault());
DatabaseHelper helper = new DatabaseHelper(getApplicationContext());
SQLiteDatabase sqLiteDatabase = helper.getReadableDatabase();
String checktime = "Select * from SCHEDULE where week_day='"+dayLongName+"'";
Cursor cursor = sqLiteDatabase.rawQuery(checktime, null);
if(cursor.moveToNext()) {
start_time = cursor.getString(cursor.getColumnIndex(DatabaseHelper.STARTTIME));
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm a",Locale.getDefault());
SimpleDateFormat simpleDateFormat2 = new SimpleDateFormat("hh:mm",Locale.getDefault());
Date milli =simpleDateFormat2.parse(start_time);
String milli2 = simpleDateFormat2.format(milli);
Date timeparsed1 = simpleDateFormat.parse(start_time);
String timeparsed2 = simpleDateFormat.format(timeparsed1);
String s = milli2;
Pattern p = Pattern.compile("(\\d+):(\\d+)");
Matcher m = p.matcher(s);
if (m.matches()) {
int hrs = Integer.parseInt(m.group(1));
int min = Integer.parseInt(m.group(2));
long ms = (long) hrs * 60 * 60 * 1000 + min * 60 * 1000;
// System.out.println("hrs=" + hrs + " min=" + min + " ms=" + ms);
Intent intent = new Intent(this, MyBroadcastReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this.getApplicationContext(), 234324243, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, ms , pendingIntent);
//Toast.makeText(getApplicationContext(),String.valueOf(ms),Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(),"Bad Format",Toast.LENGTH_SHORT).show();
}
}
在Android 4.4之后,Google引入了操作系统电源管理机制以最大程度地减少功耗。 尝试在代码中添加一个版本检查,类似于下面的代码。 如果版本为KitKat或更高版本,请使用setExact()。 否则使用set()。
请参见下面的示例:
//For Android version 4.4 up, use setExact() for the alarm
//otherwise use set()
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
alarmManager.setExact(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + syncInterval * 1000, pendingIntent);
} else {
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + syncInterval * 1000, pendingIntent);
}
试试这组代码,您的服务将永远不会停止对我有用。 一旦启动,“ setInexactReapeating”将无法在许多棒棒糖和棉花糖设备中使用,然后失去对服务的控制,这将为您提供帮助。
if (android.os.Build.VERSION.SDK_INT >= 23)
{
piLR = PendingIntent.getBroadcast(context, 0, intentLR,
PendingIntent.FLAG_UPDATE_CURRENT);
amLR.setAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP,
interval, piLR);
}
else if (android.os.Build.VERSION.SDK_INT >= 19
&& android.os.Build.VERSION.SDK_INT < 23)
{
piLR = PendingIntent.getBroadcast(context, 0, intentLR,
PendingIntent.FLAG_UPDATE_CURRENT);
amLR.setInexactRepeating(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis(), interval, piLR);
}
else
{
amLR.setRepeating(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis(), interval, piLR);
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.