How to make an ImageButton visible/invisibl

I'm 开发者_运维技巧trying to create an imagebutton to close an ad from admob. I've created the button in the xml with the visibility property set to "invisible" and then on java I set it to "visible" when the ad is received, but the button never become visible. If I set it to "visible" hardcoded on the XML it appears on the screen normally.

Admob layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/layout_main">
    <ImageButton        
        android:id="@+id/close_ad"
        android:visibility="invisible"
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_gravity="right"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="-36dip"
        android:layout_marginTop="12dip"
        android:background="@drawable/btn_close_ad" />  
</RelativeLayout>

Add ad:

private void addAd() {
    rl = (RelativeLayout) activity.getLayoutInflater().inflate(R.layout.admob, null);
    rl.setGravity(position);
    activity.addContentView(rl, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
    AdView admobView = new AdView(activity, AdSize.BANNER, Preferences.getAdmobKey());
    admobView.loadAd(new AdRequest());
    [ ... ]
    admobView.setAdListener(new AdListener() {
    @Override
    public void onReceiveAd(Ad ad) {
        Log.v("JeraAdmob", "onReceiveAd");
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                createCloseButton();
            }
        }, AD_SHOW_CLOSE);
    }
    });
}

Create button to close the ad:

private void createCloseButton() {
        ImageButton button = (ImageButton) rl.findViewById(R.id.close_ad);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                rl.removeAllViews();
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        addAd();
                        rl.bringToFront();
                    }
                }, AD_RELOAD);
            }
        });
        button.setVisibility(View.VISIBLE);
        button.bringToFront();
    }

button.setVisibility(View.VISIBLE); - is absolutely correct. Have you checked if the app really got to this line? It seems to me that it did not.

You should add the image button after the admob layout.
like this:

<RelativeLayout ...>
    <Admob..../>
    <ImageButton..../>
</RelativeLayout>