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Is there any way to access a layout's view from a non-Activity-derived class? I'm creating an Accordion class and need to access some of the activity's UI elements. I'm passing in the activity's context to my accordion class's constructor, but the findViewById API is only available from the Activity class. I also don't want to pass in an instance of my activity since that seems to be frowned upon due to potential memory leaks.
858
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.
findViewById returns an instance of View , which is then cast to the target class. All good so far. To setup the view, findViewById constructs an AttributeSet from the parameters in the associated XML declaration which it passes to the constructor of View . We then cast the View instance to Button .
View is a basic building block of UI (User Interface) in android. A view is a small rectangular box that responds to user inputs. Eg: EditText, Button, CheckBox, etc. ViewGroup is an invisible container of other views (child views) and other ViewGroup.
Tags are essentially an extra piece of information that can be associated with a view. They are most often used as a convenience to store data related to views in the views themselves rather than by putting them in a separate structure. Reference: http://developer.android.com/reference/android/view/View.html.
I'm pretty sure you can just pass an activity as a parameter, e.g.
public void initSouthViews(Activity activity) {
for (int i = 0; i < southScores_.length; ++i) {
southScores_[i] = (EditText) activity.findViewById(10);
}
}
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