Refactor view model

[xizzhu]

No description provided.

[codecov-commenter]

Codecov Report

Merging #233 (40b994a) into master (674038e) will decrease coverage by 0.04%.
The diff coverage is 51.14%.

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
- Coverage   52.34%   52.29%   -0.05%     
==========================================
  Files         122      124       +2     
  Lines        4604     4740     +136     
  Branches      609      629      +20     
==========================================
+ Hits         2410     2479      +69     
- Misses       2119     2183      +64     
- Partials       75       78       +3     

Impacted Files	Coverage Δ
...n/me/xizzhu/android/joshua/infra/BaseActivityV2.kt	0.00% <0.00%> (ø)
...android/joshua/progress/ReadingProgressActivity.kt	0.00% <0.00%> (ø)
.../me/xizzhu/android/joshua/search/SearchActivity.kt	0.00% <0.00%> (ø)
...ndroid/joshua/progress/ReadingProgressViewModel.kt	82.85% <74.28%> (-6.51%)	⬇️
...me/xizzhu/android/joshua/search/SearchViewModel.kt	92.19% <87.01%> (+0.77%)	⬆️
.../me/xizzhu/android/joshua/infra/BaseViewModelV2.kt	100.00% <100.00%> (ø)
...e/xizzhu/android/joshua/preview/PreviewViewData.kt	81.08% <100.00%> (+5.21%)	⬆️

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