I am adding horizontalScrollView programatically , but when I try to do horizontalScrollView.getMeasuredWidth() it keeps returning 0.
void addCategory(String catTitle) {
mVideos = mShows.get(catTitle);
LinearLayout theLayout = (LinearLayout)findViewById(R.id.activitymain);
TextView textview=(TextView)getLayoutInflater().inflate(R.layout.categorytitle,null);
textview.setTextColor(Color.CYAN);
textview.setTextSize(20);
textview.setText(catTitle);
HorizontalScrollView horizontalScroll = new HorizontalScrollView (this,null);
LinearLayout LL = new LinearLayout(this);
LL.setOrientation(LinearLayout.HORIZONTAL);
LayoutParams LLParams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
LL.setLayoutParams(LLParams);
HorizontalGalleryAdapter adapter = new HorizontalGalleryAdapter(this,mVideos);
for (int i = 0; i < adapter.getCount(); i++) {
View item = adapter.getView(i, null, null);
LL.addView(item);
}
horizontalScroll.addView(LL);
int maxScrollX = horizontalScroll.getChildAt(0).getMeasuredWidth()-horizontalScroll.getMeasuredWidth();
AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle("Reset...");
String max= String.valueOf(maxScrollX);
Ok, I see the problem. You create a HorizontalScrollView, add a child to it, and then immediately try to get its measured width.
You cannot do this. You must add the horizontal scroll view to an existing already-drawn view in your activity first, because otherwise it doesn't have set dimensions yet.
Think about how would it know how many pixels WRAP_CONTENT will set the dimension to before its laid out in your view? If you add it to an existing, already-laid-out view in your activity, then that WRAP_CONTENT will actually get converted to some height.
It looks like you kind-of have a loop - horizontalScroll's dimensions depend on its content (WRAP_CONTENT), yet the content's (LinearLayout's) dimensions depend on the horizontalScroll's dimensions. This does not make sense. Perhaps try MATCH_PARENT for at least the width dimensions of your horizontal scroll view. Then, make sure to not look at dimensions until the view has been drawn.