Hi,
I'm trying to create a preview effect on a Gallery view and
encountering issues with the Gallery.getChildAt(int position), which
is returning null most of the time. It's supposed to return null only
when the child is not displayed, which is not the case here, since the
user need to scroll over it.
Is there a way to solve this problem, or should I change my approach ?
Here is my code:
gallery.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_UP){
preview_container.setVisibility(View.GONE);
}
else if(event.getDownTime()>2500){
int position =
gallery.pointToPosition((int)event.getX(),
(int)event.getY());
if (position!=AdapterView.INVALID_POSITION){
View child = gallery.getChildAt(position);
if(child!=null){
Bitmap tmp_bitmap =
book.imageForPreview(position);
previewImg.setImageBitmap(tmp_bitmap);
FrameLayout.LayoutParams layout = new
FrameLayout.LayoutParams(tmp_bitmap.getWidth()+2,
tmp_bitmap.getHeight()+2,Gravity.NO_GRAVITY);
int[] coord = new int[2];
child.getLocationOnScreen(coord);
int y =
MMBookReader.this.getWindowManager().getDefaultDisplay().getHeight()-
(tmp_bitmap.getHeight()+view.getHeight());
int x = (int)
coord[0]-(tmp_bitmap.getWidth()-child.getWidth())/
2;
layout.leftMargin=x;
layout.topMargin=y;
preview_container.setVisibility(View.VISIBLE);
preview_container.setLayoutParams(layout);
previewPageCount.setText(book.getMmpages().get(position).getPosition()
+"/"+book.getPages());
}
}
else
preview_container.setVisibility(View.GONE);
}
return false;
}
});
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