How to use dateSetAction() and dismissedAction() methods in DatePickerAndroid? - reactjs

Question

The documentation is not enough to understand nor there is any example to understand. Why & how to use dateSetAction() and dismissedAction() methods in DatePickerAndroid?

Answer 1

These are basically internal getter functions/methods that are called internally to determine whether the date has been selected or not. These two methods are defined in the DatePickerAndroid class as:
static get dateSetAction() {
return 'dateSetAction';
}
static get dismissedAction() {
return 'dismissedAction';
}
You can visit this page to populate yourself about these methods.

Answer 2

Simple explanation:
dateSetAction is a type of action that tells you the date has been selected in the datepicker.
dismissedAction is also another type of action that tells you the datepicker dialog has been dismissed/closed.
Example:
async openAndroidDatePicker() {
try {
const {action, year, month, day} = await DatePickerAndroid.open({
date: new Date(2020, 4, 25)
});
if (action === DatePickerAndroid.dismissedAction) {
console.log('Date picker has been dismissed/closed');
} else if (action === DatePickerAndroid.dateSetAction) {
console.log('Date has been selected');
}
} catch ({code, message}) {
console.warn('Cannot open date picker', message);
}
}

Answer 3

If the user picked a date, Object containing action, year, month (0-11), day. If the user dismissed the dialog, the Promise will still be resolved with the action being DatePickerAndroid.dismissedAction and all the other keys being undefined. Always check whether the action before reading the values.
async openAndroidDatePicker() {
try {
const {action, year, month, day} = await DatePickerAndroid.open({
// Use `new Date()` for current date.
// May 25 2020. Month 0 is January.
date: new Date(2020, 4, 25)
});
if (action !== DatePickerAndroid.dismissedAction) {
// Selected year, month (0-11), day
}
} catch ({code, message}) {
console.warn('Cannot open date picker', message);
}
}