material-components/material-components-android

[DatePicker] Support Custom date input hint

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#2,146 opened on Mar 23, 2021

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Good First IssueWidget: DatePickerfeature request

Description

Is your feature request related to a problem? Please describe. Currently I believe we can't set the hint as we want. We only able to change it by overriding the word using these strings res

<string name="mtrl_picker_text_input_year_abbr" tools:override="true">y</string>
<string name="mtrl_picker_text_input_month_abbr" tools:override="true">m</string>
<string name="mtrl_picker_text_input_day_abbr" tools:override="true">d</string>

but we need to follow the defined format dd/mm/yy.

Describe the solution you'd like It would be nice to have if we can set the custom hint as we want maybe from dd/mm/yy to Day/Month/Year

Describe alternatives you've considered Set the string res that won't printed as double word i.e I put d it will become dd, if I want to put Day it will printed as DayDay.

Contributor guide

Tech stack
androidjava
Domain
mobile
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Android development basicsMaterial Components for Android
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the DatePicker component in the material components android library, specifically the text input hint mechanism. Look at the current implementation in the `DatePicker` class and the associated layout XML files (e.g., `mtrl picker text input date.xml`). Understand how the hint string is constructed from the string resources `mtrl picker text input year abbr`, etc. Consider adding a new attribute to allow custom hint format, such as a `app:dateInputHint` in the DatePicker's XML or a method like `setDateInputHint(String)`. Also check existing similar features in the library for guidance. The issue number is #2146 and there are no comments or PRs yet, so ensure any proposed change is backward compatible with the default behavior.