Did not check this, but I think you could just override the OnLongClick listener (for each of your EditTexts) so that it does not display the context menu. Therefore, they will not be able to copy and paste.
OnLongClickListener mOnLongClickListener = new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
return true;
}
};
user631063
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