Referencing ViewGroup in android

Question

I want to slide down a Relative layout in android withen an activity. I have the following function that slides down a layout:

public void setLayoutAnim_slidedown(ViewGroup panel, Context ctx) {

    AnimationSet set = new AnimationSet(true);

    Animation animation = new TranslateAnimation(
            Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
            0.0f, Animation.RELATIVE_TO_SELF, -1.0f,
            Animation.RELATIVE_TO_SELF, 0.0f);
    animation.setDuration(800);
    animation.setAnimationListener(new AnimationListener() {

        @Override
        public void onAnimationStart(Animation animation) {
            // TODO Auto-generated method stub
            // MapContacts.this.mapviewgroup.setVisibility(View.VISIBLE);

        }

        @Override
        public void onAnimationRepeat(Animation animation) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationEnd(Animation animation) {

            // TODO Auto-generated method stub

        }
    });
    set.addAnimation(animation);

    LayoutAnimationController controller = new LayoutAnimationController(
            set, 0.25f);
    panel.setLayoutAnimation(controller);

}

as you see the parameter in the first line is of type ViewGroup ..My question is how can I reference the View group ...

Note I tried the following

                LayoutInflater inflater = (LayoutInflater) myContext
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                View v = inflater.inflate(R.layout.childView, null);

But this returns View not a groupView !

you can always typecast View to Viewgroup as ViewGroup is super class. — N-JOY, Apr 26 '12 at 09:16
another question ... Do I have to do any thing extra than calling the function .. because the animation doesn't start by this way .. is there any thing missing? — Developer, Apr 26 '12 at 09:32

score 1 · Answer 1 · answered Apr 26 '12 at 09:14

1

Just type cast the return result to ViewGroup, provided that your R.layout.childView starts with a ViewGroup, it would be fine:

ViewGroup vg = (ViewGroup )inflater.inflate(R.layout.childView, null);

answered Apr 26 '12 at 09:14

xandy

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Yes. RelativeLayout is extended from ViewGroup – xandy Apr 26 '12 at 09:51
ok :) .. Why don't the animation starts after calling the following? vg.startLayoutAnimation(); – Developer Apr 26 '12 at 09:56
Not sure, from the code you have you just inflated the stuff, but no idea how you attach it to the window – xandy Apr 26 '12 at 10:05

Referencing ViewGroup in android

1 Answers1