Android – Hide view

Well, so I did some looking around and I saw how you supported it, but for me, it just didn't work

I need alpha that can set relativelayout in XML and code. For my XML, I have the following

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/player_controls"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:alpha="0.0">
    <RelativeLayout
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:id="@+id/player_controls_touch_me"
        >
        </RelativeLayout>
</RelativeLayout>

I received an error: the resource identifier of attribute 'alpha' cannot be found in the 'Android' package

In addition, based on Android documentation, I should be able to call setalpha (double) on any view object, but when I try to call on relativelayout, it tells me that this method is not defined for this object

Why can't I control the alpha transparency of relativelayout objects in Android? Did I miss anything? thank you!

to update

Although the visibility property works, it prevents me from clicking ViewGroup. This is important to me because I am using the ontouchlistener of ViewGroup

What I want to do is have a layer with a media control, which is initially hidden. When users click on anything on the screen, I want the control to fade in, and when they click on the screen again, I want the control to fade out. I have this part already working. I am using a view group, which is located on top of my entire application and comes with an ontouchlistener, I can determine whether it has been touched. My problem is that after the animation runs and fades out the control, they will reappear. If I use @ Hydrangea's suggestion, I can make it fade out and become invisible immediately. This gives me the effect I want, but ViewGroup is not clickable, and users can't make the control return (or disappear, depending on what we decide to do first)

I hope this makes sense

resolvent:

You will want to use alpha animation to fade in and out. This will maintain the touch event of your layout. This is an example

public class Main extends Activity {
/** Called when the activity is first created. */

private boolean mShowing = false;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    findViewById(R.id.textview).setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View arg0) {
            if(mShowing){
            Animation animation = new AlphaAnimation(1.0f, 0.0f);
            animation.setFillAfter(true);
            arg0.startAnimation(animation);
            } else {
                Animation animation = new AlphaAnimation(0.0f, 1.0f);
                animation.setFillAfter(true);
                arg0.startAnimation(animation);
            }

            mShowing = !mShowing;
        }

    });
}

}

This is the attached XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:id="@+id/textview"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    android:clickable="true"
    />
</LinearLayout>