https://guides.codepath.com/android/Using-DialogFragment
TODO:
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sub task
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empty view for 'overdue' filter
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x button when click edit
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polish notification for current task
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user defined category
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category order as preference class
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update test
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color and icon
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embed taskselector in main activity and optimize (keep history in last 24hr)
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async db and/or content provider
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recycler view
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drawable or splash activity for placeholderui. this method doesnot work because of mode_overlay https://medium.com/@lucasurbas/placeholder-ui-launch-screen-d85c35552119#.fl66n8i9k
setting activity https://github.com/davcpas1234/MaterialSettings *frequency limit