Android ICS: Remove blue divider in ActionBar

androidandroid-actionbar

I am working on an app which will be full-screen, but will utilize some of the functionalities of the ActionBar. With the Ice Cream Sandwhich release, I see that I get a blue line divider/separator as part of the ActionBar. Normally, it would be good for consistency, but in my case I need to remove the divider.

How can I remove or style the divider of the ActionBar in ICS?

Tried setting a custom theme with "android:style/Widget.Holo.ActionBar" as parent.
However, settings such as the one below has no effect

<item name="android:divider">#FFFFFF</item>

Best Answer

The graphic asset containing the blue bottom line is the background of the action bar's container view and is set to @android:drawable/ab_transparent_dark_holo when using the default Holo Dark theme.

To remove this line, you'll need to create a custom style for your action bar (based on Widget.Holo.ActionBar or Widget.Holo.Light.ActionBar (or the .Solid variants) and set the android:background to something that doesn't include the bottom border:

<style name="MyTheme" parent="android:Theme.Holo">
  <item name="android:actionBarStyle">@style/MyActionBar</item>
</style>

<style name="MyActionBar" parent="android:Widget.Holo.ActionBar">
  <item name="android:background">@drawable/your_background_here</item>
</style>

Note: Holo Dark/Light action bars have solid and transparent styles; this blue line appears by default for the transparent style. Holo Dark action bars are transparent by default and Holo Light action bars are solid by default.

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Here's what I created to hold the images that my app is currently displaying. Please note that the "Log" object in use here is my custom wrapper around the final Log class inside Android.

package com.wilson.android.library;

/*
 Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
*/
import java.io.IOException;

public class DrawableManager {
    private final Map<String, Drawable> drawableMap;

    public DrawableManager() {
        drawableMap = new HashMap<String, Drawable>();
    }

    public Drawable fetchDrawable(String urlString) {
        if (drawableMap.containsKey(urlString)) {
            return drawableMap.get(urlString);
        }

        Log.d(this.getClass().getSimpleName(), "image url:" + urlString);
        try {
            InputStream is = fetch(urlString);
            Drawable drawable = Drawable.createFromStream(is, "src");


            if (drawable != null) {
                drawableMap.put(urlString, drawable);
                Log.d(this.getClass().getSimpleName(), "got a thumbnail drawable: " + drawable.getBounds() + ", "
                        + drawable.getIntrinsicHeight() + "," + drawable.getIntrinsicWidth() + ", "
                        + drawable.getMinimumHeight() + "," + drawable.getMinimumWidth());
            } else {
              Log.w(this.getClass().getSimpleName(), "could not get thumbnail");
            }

            return drawable;
        } catch (MalformedURLException e) {
            Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e);
            return null;
        } catch (IOException e) {
            Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e);
            return null;
        }
    }

    public void fetchDrawableOnThread(final String urlString, final ImageView imageView) {
        if (drawableMap.containsKey(urlString)) {
            imageView.setImageDrawable(drawableMap.get(urlString));
        }

        final Handler handler = new Handler() {
            @Override
            public void handleMessage(Message message) {
                imageView.setImageDrawable((Drawable) message.obj);
            }
        };

        Thread thread = new Thread() {
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                Drawable drawable = fetchDrawable(urlString);
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    private InputStream fetch(String urlString) throws MalformedURLException, IOException {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet request = new HttpGet(urlString);
        HttpResponse response = httpClient.execute(request);
        return response.getEntity().getContent();
    }
}

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