I've set up a Preference Screen in which i have a list preference which allows user to select time interval to notify them.
They can choose whether to notify them after every 2,4,8,10 or 12 hours.
Here's my list preference:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<ListPreference
android:title="Notification Timer"
android:summary="Select when to Notify"
android:dialogTitle="Show Notification after every:"
android:positiveButtonText="OK"
android:negativeButtonText="Cancel"
android:entries="@array/entries"
android:entryValues="@array/entries"
android:key="listPrefs" />
</PreferenceScreen>
Here's my Settings.class file:
public class Settings extends PreferenceActivity implements OnPreferenceChangeListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.settings);
ListPreference listPreference = (ListPreference) findPreference("listPrefs");
listPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
return false;
}
});
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
// TODO Auto-generated method stub
return false;
}
}
I want to update or reset Alarms every time the user changes the time interval of notifying him/her. for ex- If user selects 4 hours than he/she must be notified after 4 hours or if user chooses 10 hours than he/she must be notified after 10 hours!
You can cancel the alarm like this: Intent intent = new Intent(this, Mote. class); PendingIntent pendingIntent = PendingIntent. getBroadcast(getApplicationContext(), 1253, intent, 0); AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); alarmManager.
Start an alarm when the device restarts This ensures that the AlarmManager will continue doing its task without the user needing to manually restart the alarm.
This example demonstrates how do I implement alarm manager in android. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.
AlarmManager is a bridge between application and Android system alarm service. It can send a broadcast to your app (which can be completely terminated by user) at a scheduled time and your app can then perform any task accordingly.
Follow these steps:
Copy the following methods to your Setting.java file:
private final int NOTIFICATION_TIMER = 11;
public void setAlarm(Context mContext,int requestCode,long time) {
Intent myIntent = new Intent(mContext, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, requestCode, myIntent,0);
cancelAlarmIfExists(mContext,requestCode,myIntent);
AlarmManager alarmManager = (AlarmManager)mContext.getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, (System.currentTimeMillis()+time), time, pendingIntent);
}
public void cancelAlarmIfExists(Context mContext,int requestCode,Intent intent){
try {
PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, requestCode, intent,0);
AlarmManager am=(AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
am.cancel(pendingIntent);
} catch (Exception e) {
e.printStackTrace();
}
}
Call them from the onPreferenceChange()
method. Like so:
listPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
long time = 34352355253; // calculate millisecons from change value by user.
setAlarm(Settings.this,NOTIFICATION_TIMER,time);
return false;
}
});
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