What is the best way to implement action bar like twitter sample UI Pattern.
Twitter for Android: A closer look at Android’s evolving UI patterns Pattern 4: Action Bar http://android-developers.blogspot.com/2010/05/twitter-for-android-closer-look-at.html
Yet another action bar implementation can be found here (shameless plug), https://github.com/johannilsson/android-actionbar. It's implemented as a library project so there's no need to copy-paste resources.
Implementation wise it's built as a widget that extends a RelativeLayout with it own layout for the actions and the bar. This makes it possible to add it to layouts with it own xml snippet.
<com.markupartist.android.widget.ActionBar
android:id="@+id/actionbar"
style="@style/ActionBar"
/>
And then later on refer to it in a activity to add actions.
ActionBar actionBar = (ActionBar) findViewById(R.id.actionbar);
actionBar.setTitle("Other");
actionBar.setHomeAction(new IntentAction(this, HomeActivity.createIntent(this), R.drawable.ic_title_home_default));
actionBar.addAction(new IntentAction(this, createShareIntent(), R.drawable.ic_title_share_default));
actionBar.addAction(new ToastAction());