Outreachy- Week 4 & 5 Progress

Working with Preferences, AudioManager, RingtoneManager   in Android.

Sometimes the noise can get too much. Imagine all the people around you at work or in a classroom. All of them have at least one cell phones. Even if they were all to make a tiny blip, the noise would be irritating and disruptive.

To avoid devices from interrupting the non-digital life, applications often provide settings that allow users to modify app volumes. My task this week was to  enable/disable silent mode in Lumicall.

To provide settings for your application, instead of using multiple Views, Preference APIs should be used.

Each preference appears as an item in a list and provides the appropriate UI for users to modify the setting.

In Lumicall, when settings menu from the menubar is selected, a preference screen is displayed showing various setting options, where I appended a “Configure Silent Mode” option.

The UI for the preference screen is expected to be in Src->xml folder under the name preferences.xml

Snippet from Lumicall’s preference.xml for Configure Silent Mode preference screen.


In Lumicall, whenever a SIP message comes in, RingtoneManager  Class is used to generate a notification sound & AudioManager Class is used to generate sound for incoming encrypted calls.

The difference between the two is that, AudioManager provides access to volume and ringer mode control. Ringer modes like, Normal, silent and vibration.  Whereas RingtoneManager provides access to ringtones, notification.

So to add a simple -disable/enable silent mode- functionality, I decided to use a CheckboxPreference. For the same goal, a better looking widget would be a SwitchPreference, but It does not work properly with DarkThemes which Lumicall uses. So I decided to use a simple Checkbox instead.

The result of all the settings are  saved as key value pairs in the default  SharedPreferences file which can be retrieved to make changes in the app based on the settings modified by the user.
Every preference has a key and the result associated with it.
To fetch the result from the SharedPreferences file-
boolean silentflag=PreferenceManager.getDefaultSharedPreferences(ctx).getBoolean(org.sipdroid.sipua.ui.Settings.PREF_SILENT_MODE, org.sipdroid.sipua.ui.Settings.DEFAULT_SILENT_MODE);

Note, the arguments in getBoolean function is  (Key, DefaultValue).

Don’t forget to pass the Context object, ctx in the statement. I wasted a lot of time figuring that one out and created a non-optimal-working way which I eventually had to remove cos I figured out how to retrieve the result value.

To add a second method of setting silent mode, i.e where the user can enter his work days/time, I wanted to display an activity with required widgets .
To display an activity on a when a preference is selected, intent tags are used. (See the above snippet)
Note that the target package in the intent tags is not the package name of where the java file of the activity is to be found.It’s the package name which is your applicationID.

Now this activity, like any other activity in android is a combination of an xml and java file.
1. My xml file contains the widgets for user to enter two set of time value in HH:MM format. i.e.the start and end time during which user requires application notifications to be silent it also contains checkboxes for user to select multiple days of the week.

2. The java file associated with this does the following:
2.1 Comparing the Real Time with User’s Specified Start and End time
2.2 Checking the current day of the week with the days marked by the user in the      checkboxes

I have used inbuilt Calendar class and Date class to accomplish this.

All done I felt quite proud but this.. this was something that tested my patience and endurance!
As I continue my work, I will keep sharing!


Please keep reading!

4 thoughts on “Outreachy- Week 4 & 5 Progress

Add yours

  1. Android appears to have centralised settings for silent mode and quiet times. Can’t you make Lumicall read and follow them? (I don’t know the Android APIs at all, I’m just a user.)


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