018 Android Radio Button Example

Exercise

to demo how to create a simple Android APP, which provides one Plain Text field and few radio buttons.
* the plain text button is designed for user input (presumption: ASCII string)
* those radio buttons are designed to convert case of content inside Plain Text field

Action

1. create one project with Basic Activity

2. add one edit text field, one radio group and five radio buttons

3. select Android SDK API whose version is lower than 24 (i.e. 23)

3.1 otherwise, you might get message such as Rendering Problems ... (updated @ 2016/8/27)

Problem

Workaround

    refer:
http://stackoverflow.com/questions/38544129/exception-raised-during-renderingbinary-xml-file-line-1error-inflating-class

4. append logic (code) to those radio buttons

5. debug and solve problems

5.1 inner class; Cannot assign a value to final variable

5.2 tracking when editText changed by software/hardware keyboard user or program,
    refer: http://stackoverflow.com/questions/21973892/detect-if-content-of-edittext-was-changed-by-user-or-programmatically
    refer: http://ocean2002n.pixnet.net/blog/post/89772699
    refer: http://catcsharp.blogspot.tw/2014/11/android-textwatcher-edittext-listener.html
   

5.3 once user is typing, state of radio buttons should be reset.

    refer: http://stackoverflow.com/questions/15945285/how-can-i-uncheck-or-reset-the-radio-button

RadioGroup.clearCheck();

    refer: http://stackoverflow.com/questions/4134582/how-to-set-a-radio-button-in-android

RadioGroup.check(R.id.radioButtonId);

5.4 use logcat for debug

Follow-Up

How to Test it in view point of Test Engineer?

tba

How to Test it in view point of Developer?

tba

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