问题
I'm a beginner in android. I have a problem like this issue Android DataBinding where to get context? Need to get context for formatting date and time of textview with data binding in correctly ways. However I don't understand the answer clearly. Anyone helps me to get context from data binding in correctly ways.
回答1:
The best way to format date and time is with String formatting. For example, you can use this:
<TextView android:text="@{@string/dateFormat(user.birthday)}" .../>
Where the dateFormat is a resource like this:
<string name="dateFormat">%1$td/%1$tm/%1$tY</string>
And the birthday is a long. You should look at the date formatter documentation for more formatting information related to time and date.
In Android DataBinding where to get context?, I gave one option, but hinted at one that is now also available. You may use the built-in context variable, which is the Context of the root View:
<TextView android:text="@{Converters.formatDate(context, user.birthday, dateFlags)}" .../>
Then your Converters class would have something like this:
public class Converters {
public static String formatDate(Context context, long timeMillis, int dateFlags) {
return DateUtils.formatDateTime(view.getContext(), timeMillis,
dateFlags)
}
}
But I recommend the first as it is easy, flexible, and uses less code. It doesn't fix your date and time formats to a single locale.
来源：https://stackoverflow.com/questions/42881529/full-example-or-tutorial-about-how-to-get-context-from-data-binding-android