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我使用CommonsWare的Lunch List例子來設置和重置鬧鐘。取消/重置來自OnAlarmReceiver的鬧鐘似乎不起作用
我在特定的時間設置了鬧鐘，然後如果是重複鬧鐘，我嘗試將鬧鐘重置爲新的日期/時間。
在OnAlarmReceiver我嘗試在我的應用程序的上下文（活動）中首次設置鬧鐘時使用原來的三行代碼。三條線是：
ComponentName component=new ComponentName(context, OnBootReceiver.class);
context.getPackageManager().setComponentEnabledSetting(component, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
OnBootReceiver.setAlarm(context, itemId, mDateDue);
但是，這似乎並不奏效。然後我試着加入這一行：
OnBootReceiver.cancelAlarm(context, itemId);
但這也沒有什麼區別。我沒有正確理解這一切如何聯繫在一起，但我懷疑：
- 我的情況是錯誤的。
- 我必須對廣播進行一些操作，例如取消廣播。
- 也許有一個標誌需要改變？
這個想法是，每當發生週期性警報時，它都會被代碼重置。我知道我可以使用重複警報，但在我的應用程序的這個階段，我更願意手動執行此操作。
這裏是OnAlarmReceiver：
public class OnAlarmReceiver extends BroadcastReceiver {
private static final int NOTIFY_ME_ID=1337;
private static final String TAG = "OnAlarmReceiver";
private DbAdapter mDbHelper;
private String mDateDue;
private String mFrequency;
@Override
public void onReceive(Context context, Intent intent) {
mDbHelper = new DbAdapter(context);
mDbHelper.open();
AudioManager audioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
Bundle bundle = intent.getExtras();
long itemId = bundle.getLong("itemId");
Cursor c = mDbHelper.getItem(itemId);
String itemTitle = c.getString(c.getColumnIndex(Db.KEY_ITEMS_TITLE));
int priority = c.getInt(c.getColumnIndex(Db.KEY_ITEMS_PRIORITY));
long listId = c.getLong(c.getColumnIndex(Db.KEY_ITEMS_LIST_ID));
String listTitle = mDbHelper.getListTitle(listId);
mDateDue = c.getString(c.getColumnIndex(Db.KEY_ITEMS_DATE_DUE));
mFrequency = c.getString(c.getColumnIndex(Db.KEY_ITEMS_FREQUENCY));
Toast.makeText(context, "Due: " + listTitle + "->" + itemTitle, Toast.LENGTH_LONG).show();
SharedPreferences prefs=PreferenceManager.getDefaultSharedPreferences(context);
boolean useNotification=prefs.getBoolean("use_notification", true);
// Check if the alarm must be reset to a new future date based on frequency
checkResetAlarm(context, itemId);
if (useNotification) {
NotificationManager mgr = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification();
if (priority == 1) { // Display red icon
notification=new Notification(R.drawable.nuvola_apps_kwrite, itemTitle, System.currentTimeMillis());
} else { // Display blue icon
notification=new Notification(R.drawable.nuvola_apps_package_editors, itemTitle, System.currentTimeMillis());
}
Intent itemEditor = new Intent(context, ActivityEditItem.class);
long lAlarmId = (long) (int) itemId;
itemEditor.putExtra(DbAdapter.KEY_ITEMS_ITEM_ID, lAlarmId);
itemEditor.putExtra("listId", listId);
itemEditor.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// For flags, also see http://developer.android.com/guide/topics/ui/actionbar.html#ActionView
PendingIntent i=PendingIntent.getActivity(context, 0, itemEditor, PendingIntent.FLAG_UPDATE_CURRENT);
notification.setLatestEventInfo(context, listTitle, itemTitle, i);
String notifyPreference = prefs.getString("notification_sound", "DEFAULT_RINGTONE_URI");
notification.sound = Uri.parse(notifyPreference);
int oldVolume = audioManager.getStreamVolume(AudioManager.STREAM_NOTIFICATION);
if (priority == 1) {
Log.d(TAG, "A high priority item is due");
//notification.defaults |= Notification.DEFAULT_VIBRATE;
Vibrator v;
v=(Vibrator)context.getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(3000);
int streamVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_NOTIFICATION);
audioManager.setStreamVolume(AudioManager.STREAM_NOTIFICATION, streamVolume, 0);
}
mgr.notify((int) (long) itemId + NOTIFY_ME_ID, notification);
audioManager.setStreamVolume(AudioManager.STREAM_NOTIFICATION, oldVolume, 0);
}
else {
Intent i=new Intent(context, AlarmActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}
}
private void checkResetAlarm(Context context, long itemId) {
if (!mFrequency.equals("")) {
String newDateDue = Item.addMinutesToDate(mDateDue, mFrequency);
Log.d(TAG, "Due date " + mDateDue + " reset with frequency of " + mFrequency + ", new due date: " + newDateDue);
mDbHelper.updateItemDueDate(itemId, newDateDue);
Toast.makeText(context, "Resetting alarm...", Toast.LENGTH_LONG).show();
ComponentName component=new ComponentName(context, OnBootReceiver.class);
context.getPackageManager().setComponentEnabledSetting(component, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
OnBootReceiver.cancelAlarm(context, itemId);
OnBootReceiver.setAlarm(context, itemId, mDateDue);
}
}
}
這裏是OnBootReceiver：
public class OnBootReceiver extends BroadcastReceiver {
public static void setAlarm(Context context, long itemId, String dateDue) {
AlarmManager mgr=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Calendar cal=Calendar.getInstance();
String[] pieces=dateDue.split("/");
String day_of_month = dateDue.substring(8,10);
String hour = dateDue.substring(11,13);
String minute = dateDue.substring(14,16);
String second = dateDue.substring(17,19);
cal.set(Calendar.YEAR, Integer.parseInt(pieces[0]));
cal.set(Calendar.MONTH, Integer.parseInt(pieces[1])-1);
cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(day_of_month));
cal.set(Calendar.HOUR_OF_DAY, Integer.parseInt(hour));
cal.set(Calendar.MINUTE, Integer.parseInt(minute));
cal.set(Calendar.SECOND, Integer.parseInt(second));
cal.set(Calendar.MILLISECOND, 0);
if (cal.getTimeInMillis()<System.currentTimeMillis()) {
cal.add(Calendar.DAY_OF_YEAR, 1);
}
mgr.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
getPendingIntent(context, itemId));
}
/**
* Cancel Alarm
*
* @param ctxt
* @param itemId
*/
public static void cancelAlarm(Context ctxt, long itemId) {
AlarmManager mgr=(AlarmManager)ctxt.getSystemService(Context.ALARM_SERVICE);
mgr.cancel(getPendingIntent(ctxt, itemId));
}
private static PendingIntent getPendingIntent(Context ctxt, long itemId) {
//Intent i = new Intent(OnAlarmReceiver.ACTION, Uri.parse("timer:"+alarmId));
Intent i=new Intent(ctxt, OnAlarmReceiver.class);
i.putExtra("itemId", itemId);
return(PendingIntent.getBroadcast(ctxt, (int) (long) itemId, i, 0));
}
// When the phone restarts all alarms must be reset by this method
@Override
public void onReceive(Context ctxt, Intent intent) {
// To be added
//setAlarm(ctxt);
}
}