Hi,
Yes. As you seen all views in android contains all 3 types of
constructors.
When you are creating your own custom view, my best practices is to
create all 3 of them as all of them are used in different situation.
Start with (2)
2) View(Context,AttributeSet)
- This will be called by android framework when your custom view is
put into any layout xml file. As you can see, the AttributeSet is the
xml parameter eg: layout_width, layout_height.
3) View(Context,AttributeSet,int defStyle)
- Same as (2), however, it provides a default style given from
framework. I never used this properly before, but, I guess it is the
default theme/ default style provided from parent view. (Can someone
shed some light here?)
1) View(Context)
- The default constructor that most developer will only implements. It
is mostly convenient for creating views by code instead of xml.
Note: You are still free to call any of the constructor in your java
code. My recommendation is at least implement (1) and (2) to use it in
code and see your view changes in config mode a.k.a. design time
support.
On Jul 5, 1:40 pm, doles sachin.d...@gmail.com wrote:
Hello,
On all views (layouts or widgets) there are three different constructors.
1) View(Context)
2) View(Context,AttributeSet)
3) View(Context,AttributeSet,int defStyle)
If I were designing and coding the first few components of an anrdoid app,
which constructors should I be mindful of implementing for re-usable
components? My constructors do have initialization logic such as setting
labels, default text and adding other widgets to layouts. Once, I call
super() in my constructor, will these three variables Context, AttributeSet
and defStyle be available to all code regardless of which constructor is
called (some might be null for the shorter constructor)?
Hope this question makes sense.
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