cordova-android-actionbar ActionBar Sherlock example

ActionBarExample.java

// Copyright (C) 2013 Polychrom Pty Ltd
//
// This program is licensed under the 3-clause "Modified" BSD license,
// see LICENSE file for full definition.
 
package com.polychrom.examples;
 
import java.util.concurrent.ExecutorService;
 
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
 
import org.apache.cordova.*;
import org.apache.cordova.api.CordovaInterface;
import org.apache.cordova.api.CordovaPlugin;
 
import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuItem;
import com.actionbarsherlock.view.Window;
 
// NOTE: cordova-android's DroidGap class currently prevents custom window features, thus we implement our own Activity (with full control) and embed Cordova instead.
public class ActionBarExample extends SherlockActivity implements CordovaInterface
{
    private CordovaPlugin activityResultCallback;
    private CordovaWebView cdv;
 
  @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        cdv = (CordovaWebView)findViewById(R.id.cordova);
        cdv.loadUrl("file:///android_asset/www/index.html");

        // Artificially create our action bar (action bar won't be created until the first call to getActionBar)
        getSupportActionBar();
    }
 
	@Override
	public boolean onCreateOptionsMenu (Menu menu)
	{
		cdv.postMessage("onCreateOptionsMenu", menu);
		super.onCreateOptionsMenu(menu);
		return true;
	}
 
	@Override
	public boolean onPrepareOptionsMenu (Menu menu)
	{
		cdv.postMessage("onPrepareOptionsMenu", menu);
		super.onPrepareOptionsMenu(menu);
		return true;
	}
 
	@Override
	public boolean onOptionsItemSelected(MenuItem item)
	{
		cdv.postMessage("onOptionsItemSelected", item);
		super.onOptionsItemSelected(item);
		return true;
	}
 
    @Override
    public void setActivityResultCallback(CordovaPlugin plugin)
    {
        this.activityResultCallback = plugin;        
    }
 
    @Override
    public void startActivityForResult(CordovaPlugin command, Intent intent, int requestCode)
    {
        this.activityResultCallback = command;
 
        // Start activity
        super.startActivityForResult(intent, requestCode);
    }
 
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent)
    {
        super.onActivityResult(requestCode, resultCode, intent);
        CordovaPlugin callback = this.activityResultCallback;
        if(callback != null)
        {
            callback.onActivityResult(requestCode, resultCode, intent);
        }
    }
    
    @Override
    public ExecutorService getThreadPool()
    {
        return getThreadPool();
    }
 
	@Override
	public Activity getActivity() { return this; }
 
	@Override
	public Object onMessage(String id, Object data) { return null; }
 
	@Override
	public Context getContext() { return this; }
 
	@Override
	public void cancelLoadUrl() {}
}

ActionBarPlugin.java

// Copyright (C) 2013 Polychrom Pty Ltd
//
// This program is licensed under the 3-clause "Modified" BSD license,
// see LICENSE file for full definition.

package com.polychrom.cordova;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;

import android.annotation.TargetApi;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockActivity;

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.support.v4.app.FragmentTransaction;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.LayoutInflater;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuItem;
import com.actionbarsherlock.view.SubMenu;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.SpinnerAdapter;
import android.widget.TextView;

import org.apache.cordova.api.CallbackContext;
import org.apache.cordova.api.CordovaPlugin;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

/**! A naive ActionBar/Menu plugin for Cordova/Android.
 * 
 * @author Mitchell Wheeler
 *
 *  Wraps the bare essentials of ActionBar and the options menu to appropriately populate the ActionBar in it's various forms.
 */
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public class ActionBarPlugin extends CordovaPlugin
{
	JSONArray menu_definition = null;
	Menu menu = null;
	HashMap<MenuItem, String> menu_callbacks = new HashMap<MenuItem, String>();

	HashMap<Integer, ActionBar.Tab> tabs = new HashMap<Integer, ActionBar.Tab>();
	HashMap<MenuItem, String> tab_callbacks = new HashMap<MenuItem, String>();
	
	// A set of base paths to check for relative paths from
	String bases[];
	
	class IconTextView extends LinearLayout
	{
		final ImageView Icon;
		final TextView Text;

		IconTextView(Context context, Drawable icon, String text)
		{
			super(context);
			Icon = new ImageView(context);
			Icon.setPadding(8, 8, 8, 8);
			Icon.setImageDrawable(icon);

            LayoutInflater inflater = LayoutInflater.from(context);
			Text = (TextView)inflater.inflate(android.R.layout.simple_spinner_dropdown_item, this, false);
			Text.setText(text);

			addView(Icon, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT));
			addView(Text);
		}
	}
	
	class NavigationAdapter extends BaseAdapter implements SpinnerAdapter
	{
		class Item
		{
			Drawable Icon = null;
			String Text = "";
		}
		
		final ActionBarPlugin plugin;
		ArrayList<Item> items = null;
		
		int listPreferredItemHeight = -1;

		class GetIconTask extends AsyncTask<String, Void, Drawable>
		{
			public final Item item;
			public Exception exception = null;
			
			GetIconTask(Item item)
			{
				this.item = item;
			}

			@Override
			protected Drawable doInBackground(String... uris)
			{
				return getDrawableForURI(uris[0]);
			}
			
			@Override
			protected void onPostExecute(Drawable icon)
			{
				if(icon != null)
				{
					item.Icon = icon;
				}
			}
		};
		
		NavigationAdapter(ActionBarPlugin plugin)
		{
			this.plugin = plugin;
		}
		
		public void setItems(JSONArray new_items)
		{
			if(new_items == null || new_items.length() == 0)
			{
				this.items = null;
				return;
			}

			items = new ArrayList<Item>();

			for(int i = 0; i < new_items.length(); ++i)
			{
				try
				{
					JSONObject definition = new_items.getJSONObject(i);
					
					Item item = new Item();
					if(!definition.isNull("text")) item.Text = definition.getString("text");
					if(!definition.isNull("icon"))
					{
						new GetIconTask(item).execute(definition.getString("icon"));
					}
					
					items.add(item);
				}
				catch(JSONException e)
				{
					// Ignore, 
				}
			}
		}

		@Override
		public int getCount()
		{
			return items == null? 0 : items.size();
		}

		@Override
		public Object getItem(int position)
		{
			return items.get(position);
		}

		@Override
		public long getItemId(int position)
		{
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent)
		{
			final Activity ctx = ((SherlockActivity)plugin.cordova);
            LayoutInflater inflater = LayoutInflater.from(ctx);
			TextView view = (TextView)inflater.inflate(android.R.layout.simple_spinner_item, parent, false);
			view.setText(items.get(position).Text);
			return view;
		}

		@Override
		public View getDropDownView(int position, View convertView, ViewGroup parent)
		{
			final Activity ctx = ((SherlockActivity)plugin.cordova);
			final Item item = items.get(position);
			
			IconTextView view;
			
			if(convertView instanceof IconTextView)
			{
				view = (IconTextView)convertView;
				view.Icon.setImageDrawable(item.Icon);
				view.Text.setText(item.Text);
			}
			else
			{
				view = new IconTextView(ctx, item.Icon, item.Text);
			}

			// Get preferred list height
			if(listPreferredItemHeight == -1)
			{
				DisplayMetrics metrics = new DisplayMetrics();
				ctx.getWindowManager().getDefaultDisplay().getMetrics(metrics);
				TypedValue value = new TypedValue();
				ctx.getTheme().resolveAttribute(android.R.attr.listPreferredItemHeight, value, true);
				listPreferredItemHeight = (int)value.getDimension(metrics);
			}
			
			view.setLayoutParams(new AbsListView.LayoutParams(AbsListView.LayoutParams.MATCH_PARENT, AbsListView.LayoutParams.WRAP_CONTENT));
			
			return view;
		}
	}
	
	NavigationAdapter navigation_adapter = new NavigationAdapter(this);
	
	ActionBar.OnNavigationListener navigation_listener = new ActionBar.OnNavigationListener()
	{
		@Override
		public boolean onNavigationItemSelected(int itemPosition, long itemId)
		{
			webView.sendJavascript("var item = window.plugins.actionbar.navigation_items[" + itemPosition + "]; if(item.click) item.click();");
			return true;
		}
	};
	
	@Override
	public Object onMessage(String id, Object data)
	{
		if("onCreateOptionsMenu".equals(id) || "onPrepareOptionsMenu".equals(id))
		{
			menu = (Menu)data;

			if(menu_definition != null && menu.size() != menu_definition.length())
			{
				menu.clear();
				menu_callbacks.clear();
				buildMenu(menu, menu_definition);
			}
		}
		else if("onOptionsItemSelected".equals(id))
		{
			MenuItem item = (MenuItem)data;
			if(item.getItemId() == android.R.id.home)
			{
				webView.sendJavascript("if(window.plugins.actionbar.home_callback) window.plugins.actionbar.home_callback();");
			}
			else if(menu_callbacks.containsKey(item))
			{
				final String callback = menu_callbacks.get(item);
				webView.sendJavascript(callback);
			}
		}
		
		return null;
	}
	
	private String removeFilename(String path)
	{
		if(!path.endsWith("/"))
		{
			path = path.substring(0, path.lastIndexOf('/')+1);
		}
		
		return path;
	}

	private Drawable getDrawableForURI(String uri_string)
	{
		Uri uri = Uri.parse(uri_string);
		Context ctx = ((SherlockActivity)cordova);

		// Special case - TrueType fonts
		if(uri_string.endsWith(".ttf"))
		{
			/*for(String base: bases)
			{
				String path = base + uri;
				
				// TODO: Font load / glyph rendering ("/blah/fontawesome.ttf:\f1234")
			}*/
		}
		// General bitmap
		else
		{
			if(uri.isAbsolute())
			{
				if(uri.getScheme().startsWith("http"))
				{
					try
					{
						URL url = new URL(uri_string);
						InputStream stream = url.openConnection().getInputStream();
						return new BitmapDrawable(ctx.getResources(), stream);
					}
					catch (MalformedURLException e)
					{
						return null;
					}
					catch (IOException e)
					{
						return null;
					}
					catch (Exception e)
					{
						return null;
					}
				}
				else
				{
					try
					{
						InputStream stream = ctx.getContentResolver().openInputStream(uri);
						return new BitmapDrawable(ctx.getResources(), stream);
					}
					catch(FileNotFoundException e)
					{
						return null;
					}
				}
			}
			else
			{
				for(String base: bases)
				{
					String path = base + uri;
					
					// Asset
					if(base.startsWith("file:///android_asset/"))
					{
						path = path.substring(22);
						
						try
						{
							InputStream stream = ctx.getAssets().open(path);
							return new BitmapDrawable(ctx.getResources(), stream);
						}
						catch (IOException e)
						{
							continue;
						}
					}
					// General URI
					else
					{
						try
						{
							InputStream stream = ctx.getContentResolver().openInputStream(Uri.parse(path));
							return new BitmapDrawable(ctx.getResources(), stream);
						}
						catch(FileNotFoundException e)
						{
							continue;
						}
					}
				}
			}
		}

		return null;
	}
	
	/**! Build a menu from a JSON definition.
	 *
	 * Example definition:
	 * [{
	 * 	 icon: 'icons/new.png',
	 *	 text: 'New',
	 *	 click: function() { alert('Create something new!'); }
	 * },
	 * {
	 * 	 icon: 'icons/save.png',
	 *	 text: 'Save As',
	 *	 header: { icon: 'icons/save.png', title: 'Save file as...' },
	 *	 items: [
	 *	 		 {
	 *	 			icon: 'icons/png.png',
	 *	 			text: 'PNG',
	 *	 			click: function() { alert('save as png'); }
	 *	 		 },
	 *	 		 {
	 *	 			icon: 'icons/jpeg.png',
	 *	 			text: 'JPEG',
	 *	 			click: function() { alert('save as jpeg'); }
	 *	 		 }
	 *	 ]
	 * },
	 * {
	 * 	 icon: 'fonts/fontawesome.ttf?U+0040',
	 *	 text: 'Contact',
	 *	 show: SHOW_AS_ACTION_NEVER
	 * }]
	 * 
	 * Note: By default all menu items have the show flag SHOW_AS_ACTION_IF_ROOM
	 * 
	 * @param menu The menu to build the definition into
	 * @param definition The menu definition (see example above)
	 * @return true if the definition was valid, false otherwise.
	 */
	private boolean buildMenu(Menu menu, JSONArray definition)
	{
		return buildMenu(menu, definition, "window.plugins.actionbar.menu");
	}

	private boolean buildMenu(Menu menu, JSONArray definition, String menu_var)
	{
		// Sadly MenuItem.setIcon and SubMenu.setIcon have conficting return types (for chaining), thus this can't be done w/ generics :(
		class GetMenuItemIconTask extends AsyncTask<String, Void, Drawable>
		{
			public final MenuItem item;
			public Exception exception = null;
			
			GetMenuItemIconTask(MenuItem item)
			{
				this.item = item;
			}

			@Override
			protected Drawable doInBackground(String... uris)
			{
				return getDrawableForURI(uris[0]);
			}
			
			@Override
			protected void onPostExecute(Drawable icon)
			{
				if(icon != null)
				{
					item.setIcon(icon);
				}
			}
		};
		
		class GetSubMenuIconTask extends AsyncTask<String, Void, Drawable>
		{
			public final SubMenu item;
			public Exception exception = null;
			
			GetSubMenuIconTask(SubMenu item)
			{
				this.item = item;
			}

			@Override
			protected Drawable doInBackground(String... uris)
			{
				return getDrawableForURI(uris[0]);
			}
			
			@Override
			protected void onPostExecute(Drawable icon)
			{
				if(icon != null)
				{
					item.setIcon(icon);
				}
			}
		};
		
		try
		{
			for(int i = 0; i < definition.length(); ++i)
			{
				final JSONObject item_def = definition.getJSONObject(i);
				final String text = item_def.isNull("text")? "" : item_def.getString("text");

				if(!item_def.has("items"))
				{
					MenuItem item = menu.add(0, i, i, text);
					if(item_def.isNull("icon") == false)
					{
						GetMenuItemIconTask task = new GetMenuItemIconTask(item);
						
						synchronized(task)
						{
							task.execute(item_def.getString("icon"));
						}
					}

					// Default to MenuItem.SHOW_AS_ACTION_IF_ROOM, otherwise take user defined value.
					item.setShowAsAction(item_def.has("show")? item_def.getInt("show") : MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT);

					menu_callbacks.put(item, "var item = " + menu_var + "[" + i + "]; if(item.click) item.click();");
				}
				else
				{
					SubMenu submenu = menu.addSubMenu(0, i, i, text);
					if(item_def.isNull("icon") == false)
					{
						GetSubMenuIconTask task = new GetSubMenuIconTask(submenu);
						
						synchronized(task)
						{
							task.execute(item_def.getString("icon"));
						}
					}
					
					// Set submenu header
					if(item_def.has("header"))
					{
						JSONObject header = item_def.getJSONObject("header");

						if(header.has("title"))
						{
							submenu.setHeaderTitle(header.getString("title"));
						}
						
						if(header.has("icon"))
						{
							submenu.setHeaderIcon(getDrawableForURI(header.getString("icon")));
						}
					}
					
					// Build sub-menu
					buildMenu(submenu, item_def.getJSONArray("items"), menu_var + "[" + i + "].items");
				}
			}
		}
		catch (JSONException e)
		{
			return false;
		}

		return true;
	}

	
	/**! Build a tab bar from a JSON definition.
	 * 
	 * Example definition:
	 * [{
	 * 	   icon: 'icons/tab1_icon.png',
	 *	 text: 'Tab #1',
	 *	 select: function() { alert('View Tab #1!'); },
	 *	 reselect: function() { alert('Refresh Tab #1!'); },
	 *	 unselect: function() { alert('Hide Tab #1!'); }
	 * },
	 * {
	 * 	   icon: 'icons/tab2_icon.png',
	 *	 text: 'Tab #2',
	 *	 select: function() { alert('View Tab #2!'); },
	 *	 reselect: function() { alert('Refresh Tab #2!'); },
	 *	 unselect: function() { alert('Hide Tab #2!'); }
	 * }]
	 * 
	 * @param bar The action bar to build the definition into
	 * @param definition The tab bar definition (see example above)
	 * @return true if the definition was valid, false otherwise.
	 */
	private boolean buildTabs(ActionBar bar, JSONArray definition)
	{
		return buildTabs(bar, definition, "window.plugins.actionbar.tabs");
	}
	
	private boolean buildTabs(ActionBar bar, JSONArray definition, String menu_var)
	{
		try
		{
			for(int i = 0; i < definition.length(); ++i)
			{
				final JSONObject item_def = definition.getJSONObject(i);
				final String text = item_def.isNull("text")? "" : item_def.getString("text");
				final Drawable icon = item_def.isNull("icon")? null : getDrawableForURI(item_def.getString("icon"));

				bar.addTab(bar.newTab().setText(text).setIcon(icon).setTabListener(new TabListener(this, menu_var + "[" + i + "]")));
			}
		}
		catch (JSONException e)
		{
			return false;
		}

		return true;
	}

	private final static List<String> plugin_actions = Arrays.asList(new String[] {
		"isAvailable",
		"show", "hide", "isShowing", "getHeight",
		"setMenu", "setTabs",
		"setDisplayOptions", "getDisplayOptions",
		"setHomeButtonEnabled", "setIcon", "setListNavigation", "setLogo",
		"setDisplayShowHomeEnabled", "setDisplayHomeAsUpEnabled", "setDisplayShowTitleEnabled", "setDisplayUseLogoEnabled",
		"setNavigationMode", "getNavigationMode", "setSelectedNavigationItem", "getSelectedNavigationItem",
		"setTitle", "getTitle", "setSubtitle", "getSubtitle"
		
	});

	@Override
	public boolean execute(final String action, final JSONArray args, final CallbackContext callbackContext) throws JSONException
	{
		if(!plugin_actions.contains(action))
		{
			return false;
		}

		if("isAvailable".equals(action))
		{
			JSONObject result = new JSONObject();
			result.put("value", ((SherlockActivity)cordova).getWindow().hasFeature(Window.FEATURE_ACTION_BAR));
			callbackContext.success(result);
			return true;
		}

		final ActionBar bar = ((SherlockActivity)cordova).getSupportActionBar();
		if(bar == null)
		{
			Window window = ((SherlockActivity)cordova).getWindow();
			if(!window.hasFeature(Window.FEATURE_ACTION_BAR))
			{
				callbackContext.error("ActionBar feature not available, Window.FEATURE_ACTION_BAR must be enabled!");
			}
			else
			{
				callbackContext.error("Failed to get ActionBar");
			}

			return true;
		}

		if(menu == null)
		{
			callbackContext.error("Options menu not initialised");
			return true;
		}

		final StringBuffer error = new StringBuffer();
		JSONObject result = new JSONObject();

		if("isShowing".equals(action))
		{
			result.put("value", bar.isShowing());
		}
		else if("getHeight".equals(action))
		{
			result.put("value", bar.getHeight());
		}
		else if("getDisplayOptions".equals(action))
		{
			result.put("value", bar.getDisplayOptions());
		}
		else if("getNavigationMode".equals(action))
		{
			result.put("value", bar.getNavigationMode());
		}
		else if("getSelectedNavigationItem".equals(action))
		{
			result.put("value", bar.getSelectedNavigationIndex());
		}
		else if("getSubtitle".equals(action))
		{
			result.put("value", bar.getSubtitle());
		}
		else if("getTitle".equals(action))
		{
			result.put("value", bar.getTitle());
		}
		else
		{
			((SherlockActivity)cordova).runOnUiThread(new Runnable()
			{
				public JSONException exception = null;
				
				public void run()
				{
					try
					{
						// This is a bit of a hack (should be specific to the request, not global)
						bases = new String[]
						{
							removeFilename(webView.getOriginalUrl()),
							removeFilename(webView.getUrl())
						};
						
						if("show".equals(action))
						{
							bar.show();
						}
						else if("hide".equals(action))
						{
							bar.hide();
						}
						else if("setMenu".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("menu can not be null");
								return;
							}

							menu_definition = args.getJSONArray(0);
							
							((SherlockActivity)cordova).invalidateOptionsMenu();
						}
						else if("setTabs".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("menu can not be null");
								return;
							}
				
							bar.removeAllTabs();
							tab_callbacks.clear();
				
							if(!buildTabs(bar, args.getJSONArray(0)))
							{
								error.append("Invalid tab bar definition");
							}
						}
						else if("setDisplayHomeAsUpEnabled".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("showHomeAsUp can not be null");
								return;
							}
				
							bar.setDisplayHomeAsUpEnabled(args.getBoolean(0));
						}
						else if("setDisplayOptions".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("options can not be null");
								return;
							}

							final int options = args.getInt(0);
							bar.setDisplayOptions(options);
						}
						else if("setDisplayShowHomeEnabled".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("showHome can not be null");
								return;
							}
				
							bar.setDisplayShowHomeEnabled(args.getBoolean(0));
						}
						else if("setDisplayShowTitleEnabled".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("showTitle can not be null");
								return;
							}
				
							bar.setDisplayShowTitleEnabled(args.getBoolean(0));
						}
						else if("setDisplayUseLogoEnabled".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("useLogo can not be null");
								return;
							}
				
							bar.setDisplayUseLogoEnabled(args.getBoolean(0));
						}
						else if("setHomeButtonEnabled".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("enabled can not be null");
								return;
							}
				
							bar.setHomeButtonEnabled(args.getBoolean(0));
						}
						else if("setIcon".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("icon can not be null");
								return;
							}
							
							Drawable drawable = getDrawableForURI(args.getString(0));
							bar.setIcon(drawable);
						}
						else if("setListNavigation".equals(action))
						{
							JSONArray items = null;
							if(args.isNull(0) == false)
							{
								items = args.getJSONArray(0);
							}
							
							navigation_adapter.setItems(items);
							bar.setListNavigationCallbacks(navigation_adapter, navigation_listener);
						}
						else if("setLogo".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("logo can not be null");
								return;
							}
							
							Drawable drawable = getDrawableForURI(args.getString(0));
							bar.setLogo(drawable);
						}
						else if("setNavigationMode".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("mode can not be null");
								return;
							}

							final int mode = args.getInt(0);
							bar.setNavigationMode(mode);
						}
						else if("setSelectedNavigationItem".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("position can not be null");
								return;
							}
				
							bar.setSelectedNavigationItem(args.getInt(0));
						}
						else if("setSubtitle".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("subtitle can not be null");
								return;
							}
				
							bar.setSubtitle(args.getString(0));
						}
						else if("setTitle".equals(action))
						{
							if(args.isNull(0))
							{
								error.append("title can not be null");
								return;
							}
				
							bar.setTitle(args.getString(0));
						}
					}
					catch (JSONException e)
					{
						exception = e;
					}
					finally
					{
						if(exception != null)
						{
							callbackContext.error(exception.toString());
						}
						else
						{
							callbackContext.success();
						}
					}
				};
			});
		}

		return true;
	}

	public static class TabListener implements ActionBar.TabListener
	{
		private ActionBarPlugin plugin;
		private String js_item;

		public TabListener(ActionBarPlugin plugin, String js_item)
		{
			this.plugin = plugin;
			this.js_item = js_item;
		}

		public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft)
		{
			String callback = "var item = " + js_item + "; if(item.select) item.select(item);";
			
			plugin.webView.sendJavascript(callback);
		}

		public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft)
		{
			String callback = "var item = " + js_item + "; if(item.unselect) item.unselect(item);";
			
			plugin.webView.sendJavascript(callback);
		}

		public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft)
		{
			String callback = "var item = " + js_item + "; if(item.reselect) item.reselect(item);";
			
			plugin.webView.sendJavascript(callback);
		}
	}
}

Updated to fix a deadlock issue on Android 2.x