问一个监听剪切板的问题，java代码写好了，NJS不知道咋改，求大佬帮改！

ClipboardManager.OnPrimaryClipChangedListener onPrimaryClipChangedListener;
final ClipboardManager clipboardManager = (ClipboardManager)this.getSystemService(Context.CLIPBOARD_SERVICE);
onPrimaryClipChangedListener = new ClipboardManager.OnPrimaryClipChangedListener() {
@Override
public void onPrimaryClipChanged() {
if(clipboardManager.hasPrimaryClip() && clipboardManager.getPrimaryClip().getItemCount() > 0){
Toast.makeText(getApplicationContext(), clipboardManager.getPrimaryClip().getItemAt(0).getText(),Toast.LENGTH_LONG).show();
}
}
};
clipboardManager.addPrimaryClipChangedListener(onPrimaryClipChangedListener);