Android

abstract#

Emergency Situation Sharing Tool would provide the situations with location information of your people such as your family when a great disaster happens. Here I will record the development.

topics#

mission#

this tool would provide the situations with location information of your people such as your family when a great disaster happens.

usecase scenario#

1. a big earthquake happens, and Japan Meteorological Agency issues Emergency Warning
2. user gets Emergency Warning via some devices such as android smartphone. (uc1)
3. the android smartphone will send messages to his or her family with location information.(uc2)
4. his or her family can check when and where he or she was.(uc3)

requirements#

the application has functions to:

• (uc1) get earthquake emergency warning as real time as possible. I need a possible solution to push information from server to client. (req1)
• (uc2) send message by using email (req2)
• (uc3)set email addresses the user want to share his or her location.(req3) And create a veiw to show family's location with time.(req4)

These functions should be working background. (req5)

Design#

• req1: TBD

one option is Twitter[1][6]. @yurekuru, eew

Twitter4j[3] should be studied for implementation.

In terms of methodology, Websocket and Webhooks should be studied[2]

Twitter Account Activity API[4], which is one of webhook, seems not to provide realtime tweets of someone. (I can get webhook json of my own tweet information in realtime from twitter, but that is not what I wanted to do).

Mightbe Firebase[5] can be used, but Firebase is not free for combination with third web service such as GMAIL and Twitter.

• req2: GMAIL will be used. Still other notification method will be investigated.

I tried to Send Message by Gmail and I think we can develop android application to send GMAIL with location information.

• req3: Location

About Location, I try to use Location API[7]. LocationManager I used before seems to be old.->Android Location

Investigation#

• Twitter Kit Android

This sample application[8] seems to provide various good functions such as real time tweet search and notification. They should be studied.

• Notification

ServerからClientへのNotificationをやって、それをキックに動かせないか確認。Firebase Cloud Messagingで出てきたけど」。。

reference#

1. [#1]oov, 2011年3月21日, 緊急地震速報を使って何か作りたい時の情報ソース, https://bl.oov.ch/2011/03/blog-post.html
2. [#2]AtsushiNakatsugawa, 2017/1/23, APIでリアルタイムコミュニケーションを実現するには, https://developer.ntt.com/ja/blog/4c5ab626-3522-45d8-b3b8-194bbc28afe9
3. [#3]Yusuke Yamamoto, Twitter4j, http://twitter4j.org/
4. [#4]Twitter, Inc., 2018, Get activities related to an account in real-time, https://developer.twitter.com/en/products/accounts-and-users/account-activity-api.html
5. [#5]Google, Firebase はモバイルアプリの作成とビジネスの成長に役立ちます。https://firebase.google.com
6. [#6]Twitter, Inc., Twitter Apps, https://apps.twitter.com
7. [#7]さくら、2016年11月27日, LocationManagerはもう古い！Google Service の Location APIを使って現在位置を取得する, http://sakura-bird1.hatenablog.com/entry/2016/11/27/224200
8. [#[8]Twitter, Inc., 2018年5月あたり, Twitter Kit for Android, https://github.com/twitter/twitter-kit-android