Many applications are display messages using Dialogs, Toasts, Snackbars, Tutorial, etc.
However, some messages may be overkind and boring.

"Denbun" is a lightweight library. Denbun("電文") in Japanese is called "Message" in English.
This library supports to suppress messages and adjust frequency.

For example...

• Dialog with "Don't ask again"
• One shot (or N shots) dialog
• Showing once per week
• Dialog for light users

Denbun is save the display time, counts and Frequency.
It helps to calculate the best timing of next display.

Download

Get the latest JARs or grab via Gradle:

compile 'com.yuki312:denbun:<latest version>'

Usage

First, initialize DenbunBox in Application.onCreate.

DenbunBox.init(new DenbunConfig(this));

Next, get a Denbun instance.
The message state is restored to the Denbun instance.

Denbun msg = DenbunBox.get(ID);

Following code will save the message state.

Denbun msg = DenbunBox.get(ID);
msg.shown();

Display frequency can be adjusted with the adjuster.

// This message is displayed only once.
Denbun msg = DenbunBox.get(ID, new CountAdjuster(1));
...
msg.isShowable(); // true
msg.shown();
msg.isShowable(); // false

Or adjuster can be preset to the DenbunBox.

DenbunBox.preset(ID, new CountAdjuster(1));
...
Denbun msg = DenbunBox.get(ID);  // Has CountAdjuster.

Following code is suppress message.

Denbun msg = DenbunBox.get(ID);
msg.suppress(true);

Preset frequency adjusters

There are several adjusters provided in this library.

Adjuster Name	Description
CountAdjuster	For N shots dialogs
IntervalAdjuster	For periodic dialogs
CoolDownAdjuster	For periodic and N shots dialogs

Or create custom adjuster.

Denbun msg = DenbunBox.find(ID,
    s -> s.count == 0 ? Frequency.MIN : Frequency.MAX);
if (msg.isShowable())
  msg.shown();  // s.count will increment.

Configuration

DenbunBox is configured with DenbunConfig.

Method	Description
preference	Set SharedPreference to save message history
daoProvider	Set SharedPreference DAO (For your UnitTest)

How it works?

Denbun save the display history to SharedPreference. You can find the default SharedPreference path in DenbunConfig.PREF_NAME.

Denbun can be created using DenbunBox. DenbunBox has Application scope, you can access DenbunBox from anywhere in the application and create Denbun instance. FrequencyAdjuster can be preset to the DenbunBox. Denbun uses FrequencyAdjuster to adjust display frequency.

Testability

You can mock/spy the Denbun data I/O.

DenbunConfig conf = new DenbunConfig(app);

// spy original DaoProvider
Dao.Provider origin = conf.daoProvider();
conf.daoProvider(pref -> (spyDao = spy(origin.create(pref))));
DenbunBox.init(conf);

DenbunBox.find(ID).shown();
verify(spyDao, times(1)).update(any());

License

Copyright 2017 Matsumura Yuki. Licensed under the Apache License, Version 2.0;