In Android API 11+, Google has released a new class called `Fragment`.

In the videos, Google suggests that whenever possible ([link1][1], [link2][2]), we should use fragments instead of activities, but they didn&#39;t explain exactly why.

What&#39;s the purpose of fragments and some possible uses of them (other than some UI examples that can be easily be achieved by simple views/layouts)?

My question is about fragments:

 1. What are the purposes of using a fragment?
 2. What are the advantages and disadvantages of using fragments compared to using activities/views/layouts?

Bonus questions:

 3. Can you give some really interesting uses for fragments? Things that Google didn&#39;t mention in their videos?
 4. What&#39;s the best way to communicate between fragments and the activities that contain them?
 5. What are the most important things to remember when you use fragments? Any tips and warnings from your experience?

  [1]: https://www.youtube.com/watch?v=WGIU2JX1U5Y
  [2]: https://www.youtube.com/watch?v=sTx-5CGDvM8


Why fragments, and when to use fragments instead of activities?

how can I change the text color of the ActionBar? I&#39;ve inherited the Holo Light Theme, I&#39;m able to change the background of the ActionBar but I don&#39;t find out what is the attribute to tweak to change the text color.

---

Ok, I&#39;m able to change the text color with the attribute android:textColorPrimary but it also changes the text color of the dropdown menu displayed when an overflow happen on the ActionBar buttons. Any idea how to change the color of those dropdown menu / List ?

ActionBar text color

I&#39;m trying to animate the transition between fragments. I got the answer from the following   
[Android Fragments and animation][1]  

    FragmentTransaction ft = getFragmentManager().beginTransaction();
    ft.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right);
    
    DetailsFragment newFragment = DetailsFragment.newInstance();
    
    ft.replace(R.id.details_fragment_container, newFragment, &quot;detailFragment&quot;);
    
    // Start the animated transition.
    ft.commit();

And my R.anim.slide_in_left 

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;set xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
            &lt;translate android:fromXDelta=&quot;50%p&quot; android:toXDelta=&quot;0&quot;
                android:duration=&quot;@android:integer/config_mediumAnimTime&quot;/&gt;
           &lt;alpha android:fromAlpha=&quot;0.0&quot; android:toAlpha=&quot;1.0&quot;
                android:duration=&quot;@android:integer/config_mediumAnimTime&quot; /&gt;
    &lt;/set&gt;

But when I tried this it showed  

    02-08 16:27:37.961: ERROR/AndroidRuntime(1717): FATAL EXCEPTION: main
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717): java.lang.RuntimeException: Unknown animator name: translate
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717):     at android.animation.AnimatorInflater.createAnimatorFromXml(AnimatorInflater.java:129)
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717):     at android.animation.AnimatorInflater.createAnimatorFromXml(AnimatorInflater.java:126)
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717):     at android.animation.AnimatorInflater.createAnimatorFromXml(AnimatorInflater.java:93)
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717):     at android.animation.AnimatorInflater.loadAnimator(AnimatorInflater.java:72)
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717):     at android.app.FragmentManagerImpl.loadAnimator(FragmentManager.java:621)
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717):     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:733)
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717):     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:919)
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717):     at android.app.BackStackRecord.run(BackStackRecord.java:578)
    02-08 16:27:37.961: ERROR/AndroidRuntime(1717):     at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1217)


Any ideas? When I checked Honeycomb API reference `translate` is there. What did I miss?  
Is there any other way to animate the transition between fragments?
Thank you 




  [1]: https://stackoverflow.com/questions/4817900/android-fragments-and-animation


Animate the transition between fragments

How should you implement the sort of sliding that for example the Honeycomb Gmail client uses?

Can `TransactionManager` handle this automatically by adding and removing the Fragments, it&#39;s kind of difficult to test this due to the emulator being a slideshow :)

Android Fragments and animation

I want to add a Fragment to an Activity that implements its layout programmatically. I looked over the Fragment documentation but there aren&#39;t many examples describing what I need. Here is the type of code I tried to write:

    public class DebugExampleTwo extends Activity {

        private ExampleTwoFragment mFragment;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            FrameLayout frame = new FrameLayout(this);
            if (savedInstanceState == null) {
                mFragment = new ExampleTwoFragment();
                FragmentTransaction ft = getFragmentManager().beginTransaction();
                ft.add(frame.getId(), mFragment).commit();
            }
            
            setContentView(frame);
        }
    }

...
    
    public class ExampleTwoFragment extends Fragment {

        @Override
        public View onCreateView(LayoutInflater inflater, 
                                 ViewGroup container, 
                                 Bundle savedInstanceState) {
            Button button = new Button(getActivity());
            button.setText(&quot;Hello There&quot;);
            return button;
        }
    }

This code compiles but crashes at start, probably because my `FragmentTransaction.add()` is incorrect. What is the correct way to do this?

How do I add a Fragment to an Activity with a programmatically created content view

I need to implement splash screen in my honeycomb app.
I use this code in activity&#39;s onCreate to show splash:

    setContentView(R.layout.splash);
    getActionBar().hide();

and this code to show main UI after sometime:

    setContentView(R.layout.main);
    getActionBar().show();

But *before* onCreate is called and splash appears, there is small amount of time when action bar shown.

How can I make action bar invisible?

I tried to apply theme to activity without action bar:

    &lt;item name=&quot;android:windowActionBar&quot;&gt;false&lt;/item&gt;

but in that case getActionBar() always returns null and I found no way to show it again.

How to hide action bar before activity is created, and then show it again?

I&#39;m having an odd problem.
I am making an app with targetsdk 13. 

In my main activity&#39;s onCreate method i call `getActionBar()` to setup my actionbar. This works fine when running on the Android 3.2 emulator, but when using Android 3.0 and 3.1 the `getActionBar()` method returns null.

I find this extremely odd, and i cannot see any reason why it would do so.
Is this a bug with the emulators or is there something i need to do, in order to ensure that my application has an actionbar? 

**SOLUTION:**
I think I&#39;ve found a solution for this problem.
I wasn&#39;t using the setContentView to set a layout for the activity. Instead I was using `fragmentTransaction.add(android.R.id.content, mFragment, mTag)` to add a fragment to the activity.
This worked fine in 3.2, but in earlier honeycomb versions the action bar is apparently not set if you don&#39;t use the setContentView in the `onCreate()` method.
So I fixed it by using the `setContentView()` method in my `onCreate()` method and just supplying it with a layout that contained an empty FrameLayout.
I can still use the `fragmentTransaction.add(android.R.id.content, mFragment, mTag)` method the same way as before.

It&#39;s not the prettiest fix, but it works. 

getActionBar() returns null

I&#39;m looking to write preferences that can be applied to both 3.0 and pre-3.0 devices. Discovering that `PreferenceActivity` contains deprecated methods (although these are used in the accompanying sample code), I looked at `PreferenceFragement` and the compatibility package to solve my woes.

It appears, though, that `PreferenceFragment` isn&#39;t in the compatibility package. Can anyone tell me whether this was intentional?  If so, can I easily target a range of devices (i.e. &lt; 3.0 and &gt;=3.0) or will I have to jump through hoops?  If it wasn&#39;t intentionally excluded, can we expect a new release of the compatibility package?  Or is there another workaround that is safe to use?

Cheers

James

Was PreferenceFragment intentionally excluded from the compatibility package?

I haven&#39;t found something like `setTag(String tagName)` method in the `Fragment` class. The only way to set a `Fragment` tag that I have found is by doing a `FragmentTransaction` and passing a tag name as parameter.

Is this the only way to explicitly set a `Fragment` tag by code?



How to set a Fragment tag by code?

I have an activity with a listview. When the user click the item, the item &quot;viewer&quot; opens:

    List1.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView&lt;?&gt; arg0, View arg1, int arg2,long arg3) {

            Intent nextScreen = new Intent(context,ServicesViewActivity.class);
            String[] Service = (String[])List1.getItemAtPosition(arg2);

            //Sending data to another Activity
            nextScreen.putExtra(&quot;data&quot;, datainfo);
            startActivityForResult(nextScreen,0);
            overridePendingTransition(R.anim.right_enter, R.anim.left_exit);
        }
    });

This works fine, but on the actionbar the back arrow next to the app icon doesn&#39;t get activated. Am I missing something?


How to implement the Android ActionBar back button?

My application&#39;s main icon consists of two parts in one image: a logo and a few letters below it. This works well for the launcher icon for the app, but when the icon appears on the left edge of the ActionBar, the letters get cut off and it doesn&#39;t look good.

I would like to provide the ActionBar with a separate version of the icon, with only the &quot;logo&quot; part and not the letters beneath it, but so far have been coming up empty. I honestly can&#39;t find any answer to this, and I can&#39;t even find the question itself anywhere.


Android: How to change the ActionBar &quot;Home&quot; Icon to be something other than the app icon?

Is it possible to change the overflow icon in the action bar? I have blue icons for all ActionBar items and I also want to change the overflow icon when it appears.

Changing overflow icon in the action bar

I&#39;m trying to add support for the `SearchView` in the Android 3.0+ ActionBar, but I can&#39;t get the `OnCloseListener` to work.

Here&#39;s my code:

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.menu, menu);
		searchView = (SearchView) menu.findItem(R.id.search_textbox).getActionView();
		searchView.setOnQueryTextListener(new OnQueryTextListener() {
			@Override
			public boolean onQueryTextChange(String newText) {
				searchLibrary(newText);
				return false;
			}
			@Override
			public boolean onQueryTextSubmit(String query) { return false; }
		});
		searchView.setOnCloseListener(new OnCloseListener() {
			@Override
			public boolean onClose() {
				System.out.println(&quot;Testing. 1, 2, 3...&quot;);
				return false;
			}
		});
		return true;
	}

The search works great and every is working except for the `OnCloseListener`. Nothing is being printed to Logcat. Here&#39;s the Logcat for when I&#39;m pressing the &quot;Close&quot; button:

    02-17 13:01:52.914: I/TextType(446): TextType = 0x0
    02-17 13:01:57.344: I/TextType(446): TextType = 0x0
    02-17 13:02:02.944: I/TextType(446): TextType = 0x0

I&#39;ve looked through [the documentation][1] and samples, but nothing seemed to change it. I&#39;m running it on a Asus Transformer Prime and a Galaxy Nexus, both on Ice Cream Sandwich. Any ideas?

**Update:**

Yes - `System.out.println()` *does* work. Here&#39;s proof:

 

       @Override
     public boolean onQueryTextChange(String newText) {
        System.out.println(newText + &quot;hello&quot;);
        searchLibrary(newText);
        return false;
     }

Results in this Logcat:

    02-17 13:04:20.094: I/System.out(21152): hello
    02-17 13:04:24.914: I/System.out(21152): thello
    02-17 13:04:25.394: I/System.out(21152): tehello
    02-17 13:04:25.784: I/System.out(21152): teshello
    02-17 13:04:26.064: I/System.out(21152): testhello

  [1]: http://developer.android.com/reference/android/widget/SearchView.OnCloseListener.html

SearchView&#39;s OnCloseListener doesn&#39;t work

I tried following this tutorial:
[Getting Data from the Web][1]

I tried implementing it on Android 3.0, the latest platform for tablets, however, I get this error: &quot;**Unable to resolve host &quot;www.anddev.org&quot; No address associated with hostname.**&quot;

You can checkout the URL that I used just to prove that the file exists.
http://www.anddev.org/images/tut/basic/getdatafromtheweb/loadme.txt

I created a private class and extended it with asynctask. Here is the code:

        private class Downloader extends AsyncTask&lt;String,Void,String&gt;{
    	String myString = null;
		@Override
		protected String doInBackground(String... arg0) {
			try{
				URL myURL = new URL(&quot;http://www.anddev.org/images/tut/basic/getdatafromtheweb/loadme.txt&quot;);
				URLConnection ucon = myURL.openConnection();
				InputStream is = ucon.getInputStream();
				BufferedInputStream bis = new BufferedInputStream(is);
				
				ByteArrayBuffer baf = new ByteArrayBuffer(50);
				int current = 0;
				while((current=bis.read())!=-1){
					baf.append((byte)current);
				}
				myString = new String (baf.toByteArray());
			}catch(Exception e){
				myString = e.getMessage();
			}
			return myString;
		}
    @Override
    protected void onPostExecute(String result){
    	tv.setText(result);
    }
    }

Any help out there would be appreciated.
  [1]: http://www.anddev.org/novice-tutorials-f8/getting-data-from-the-web-urlconnection-via-http-t351.html

Unable to resolve host &quot;&lt;insert URL here&gt;&quot; No address associated with hostname

I&#39;m using the compatibility package to use Fragments with Android 2.2. 
When using fragments, and adding transitions between them to the backstack, I&#39;d like to achieve the same behavior of onResume of an activity, i.e., whenever a fragment is brought to &quot;foreground&quot; (visible to the user) after poping out of the backstack, I&#39;d like some kind of callback to be activated within the fragment (to perform certain changes on a shared UI resource, for instance).

I saw that there is no built in callback within the fragment framework. is there s a good practice in order to achieve this?

Fragments onResume from back stack

I currently have a fragment in an overlay. This is for signing in to the service. In the phone app, each of the steps I want to show in the overlay are their own screens and activities. There are 3 parts of the sign-in process and each had their own activity that was called with startActivityForResult(). 

Now I want to do the same thing using fragments and an overlay. The overlay will show a fragment corresponding to each activity. The problem is that these fragments are hosted in an activity in the Honeycomb API. I can get the first fragment working, but then I need to startActivityForResult(), which isn&#39;t possible. Is there something along the lines of startFragmentForResult() where I can kick off a new fragment and when it&#39;s done have it return a result to the previous fragment?

Is there a method that works like start fragment for result?

In my Android Honeycomb application I use Tabs as the navigation style. I would like to add one item next to the overflow button, but I want that item to be a dropdown list, and the user will be able to select an option there, but not related to navigation. What is the easiest way since I&#39;m using `mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);`

Is it possible to do it without using a custom view?


How to add a Dropdown item on the action bar

now that the final SDK is out with google apis - what is the best way to create a Fragment with a MapView? MapView needs a MapActivity to work right.

Having the Activity managing the Fragments inherit from MapActivity (bad solution because it goes against the idea that Fragments are self contained) and use a regular xml based layout does not work. I get a NullPointerException in MapActivity.setupMapView():
&lt;pre&gt;
E/AndroidRuntime(  597): Caused by: java.lang.NullPointerException
E/AndroidRuntime(  597): 	at com.google.android.maps.MapActivity.setupMapView(MapActivity.java:400)
E/AndroidRuntime(  597): 	at com.google.android.maps.MapView.&lt;init&gt;(MapView.java:289)
E/AndroidRuntime(  597): 	at com.google.android.maps.MapView.&lt;init&gt;(MapView.java:264)
E/AndroidRuntime(  597): 	at com.google.android.maps.MapView.&lt;init&gt;(MapView.java:247)
&lt;/pre&gt;

My second idea was to create the MapView programmatically and pass the associated activity (via getActivity()) as Context to the MapView constructor. Does not work:
&lt;pre&gt;
E/AndroidRuntime(  834): Caused by: java.lang.IllegalArgumentException: MapViews can only be created inside instances of MapActivity.
E/AndroidRuntime(  834): 	at com.google.android.maps.MapView.&lt;init&gt;(MapView.java:291)
E/AndroidRuntime(  834): 	at com.google.android.maps.MapView.&lt;init&gt;(MapView.java:235)
E/AndroidRuntime(  834): 	at de.foo.FinderMapFragment.onCreateView(FinderMapFragment.java:225)
E/AndroidRuntime(  834): 	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:708)
E/AndroidRuntime(  834): 	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:900)
E/AndroidRuntime(  834): 	at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:978)
E/AndroidRuntime(  834): 	at android.app.Activity.onCreateView(Activity.java:4090)
E/AndroidRuntime(  834): 	at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:664)
&lt;/pre&gt;

Really there should be something like MapFragment that takes care of the background threads MapView needs I guess... So what is the current best practice to do this?

Thanks and regards from Germany,
Valentin

MapView in a Fragment (Honeycomb)

I&#39;d like to use the `Holo.Light` theme on devices that support it, and fall back to the regular `Light` theme on other devices.

At the moment, referencing `Holo.Light` works fine on 3.0+, but older APIs simply revert to the default &#39;dark&#39; theme. Can I achieve what I want with with style inheritance?

How to use Holo.Light theme, and fall back to &#39;Light&#39; on pre-honeycomb devices?

I have a searchView in the ActionBar. I want to dismiss the keyboard when the user is done with input. I have the following queryTextListener on the searchView

	final SearchView.OnQueryTextListener queryTextListener = new SearchView.OnQueryTextListener() { 
	    @Override 
	    public boolean onQueryTextChange(String newText) { 
	        // Do something 
	        return true; 
	    } 

	    @Override 
	    public boolean onQueryTextSubmit(String query) {
	    	
	    	showProgress();
		    // Do stuff, make async call
		
			getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
			
	        return true; 
	    } 
	};

Based on similar questions, the following code should dismiss the keyboard, but it doesn&#39;t work in this case:

    getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

I&#39;ve also tried:

    InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(searchView.getWindowToken(), 0);

Neither one works. I&#39;m not sure if this is a Honeycomb specific problem or if it&#39;s related to the searchView in the ActionBar, or both. Has anyone gotten this working or know why it does not work?


How to dismiss keyboard in Android SearchView?

I haven&#39;t found a simple way to get all currently active (visible, currently in Resumed state) Fragments in an Activity. Is it possible without custom bookkeeping in my Activity? It seems that the FragmentManager doesn&#39;t support this feature.

Is there a way to get references for all currently active fragments in an Activity?

Via xml I can add submenu items to my action in the `ActionBar`.

![enter image description here][1]

main_menu.xml:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;menu xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
        &lt;item android:id=&quot;@+id/menu_new_form&quot;
              android:icon=&quot;@drawable/ic_new_form&quot;
              android:title=&quot;@string/menu_new_form&quot;
              android:showAsAction=&quot;ifRoom|withText&quot;&gt;
            &lt;menu&gt;
                &lt;item android:id=&quot;@+id/form1&quot;
                      android:icon=&quot;@drawable/attachment&quot;
                      android:title=&quot;Form 1&quot;
                      android:onClick=&quot;onSort&quot; /&gt;
                &lt;item android:id=&quot;@+id/form2&quot;
                      android:icon=&quot;@drawable/attachment&quot;
                      android:title=&quot;Form 2&quot;
                      android:onClick=&quot;onSort&quot; /&gt;
            &lt;/menu&gt;
        &lt;/item&gt;
    &lt;/menu&gt;

**But how can I add these sub items via Java code**? It doesn&#39;t work as below, the sub items are getting added to the wrong action (and also the drawable isn&#39;t shown), the very right button, not my &#39;New Form&#39; button:

![enter image description here][2]

main_menu.xml:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;menu xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
        &lt;item android:id=&quot;@+id/menu_new_form&quot;
              android:icon=&quot;@drawable/ic_new_form&quot;
              android:title=&quot;@string/menu_new_form&quot;
              android:showAsAction=&quot;ifRoom|withText&quot;&gt;
        &lt;/item&gt;
    &lt;/menu&gt;

Java Code:

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main_menu, menu);

        Log.d(&quot;MainMenu&quot;, &quot;,menu title0: &quot; + menu.getItem(0).getTitle()); 
        // returns &quot;New Form&quot;

        menu.addSubMenu(0, Menu.NONE, 1, &quot;Form 1&quot;).setIcon(R.drawable.attachment);
        menu.addSubMenu(0, Menu.NONE, 2, &quot;Form 2&quot;).setIcon(R.drawable.attachment);
        return true;
    }

Is there a way to achieve this, adding sub menu items via Java Code instead of XML, **without** using a `PopupMenu` ([http://developer.android.com/guide/topics/ui/menus.html#PopupMenu][3])?


 
**Update (Solution):**

My final code snippet I ended up with to populate the submenu dynamically, following adamp&#39;s reply:

    // menu options
    private static final int MENU_PREFERENCES = Menu.FIRST;
    private static final int MENU_LOGOUT = 2;

    @Override
    public boolean onCreateOptionsMenu(final Menu menu) {
        super.onCreateOptionsMenu(menu);

        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main_menu, menu);
        menu.add(0, MENU_PREFERENCES, 0, getString(R.string.general_preferences)).setIcon(
                android.R.drawable.ic_menu_preferences);

        // load all available form templates
        Cursor c = managedQuery(FormsProviderAPI.FormsColumns.CONTENT_URI, null, null, null, null);
        try {
            int ixDisplayName = c.getColumnIndex(FormsProviderAPI.FormsColumns.DISPLAY_NAME);
            int ixId = c.getColumnIndex(FormsProviderAPI.FormsColumns._ID);
            int cnt = 0;
            while (c.moveToNext()) {
                cnt++;
                Log.d(&quot;ID: &quot;, &quot;ID: &quot;+ c.getInt(ixId));  // misusing the group id for the form id
                menu.getItem(1).getSubMenu().addSubMenu(c.getInt(ixId), Menu.NONE, cnt, c.getString(ixDisplayName)).setIcon(R.drawable.attachment_dark);
            }
        } catch (Exception e) {
            Log.e(TAG, &quot;Error init form templates list.&quot;, e);
        }

        return true;
    }

  [1]: http://i.stack.imgur.com/zzn5Y.png
  [2]: http://i.stack.imgur.com/JEL0w.png
  [3]: http://developer.android.com/guide/topics/ui/menus.html#PopupMenu

How to add submenu items to ActionBar action in code?

How can I remove the application icon &amp; title which comes by default in an action bar?

There is a similar question here: https://stackoverflow.com/questions/5030700/can-i-hide-the-app-icon-from-the-action-bar-in-honeycomb, but it doesn&#39;t talk about how to do it?

Remove application icon and title from Honeycomb action bar

I really like the new PopupMenu we got in 3.0, but I just can&#39;t display any icons next to the menu items in it. I&#39;m inflating the menu from the .xml below:

&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;menu xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;

	&lt;item android:id=&quot;@+id/menu_delete_product&quot;
		android:icon=&quot;@drawable/sym_action_add&quot;
		android:title=&quot;delete&quot;
		android:showAsAction=&quot;ifRoom|withText&quot; /&gt;
		
	&lt;item android:id=&quot;@+id/menu_modify_product&quot;
		android:icon=&quot;@drawable/sym_action_add&quot;
		android:title=&quot;modify&quot;
		android:showAsAction=&quot;ifRoom|withText&quot; /&gt;
	
	&lt;item android:id=&quot;@+id/menu_product_details&quot;
		android:icon=&quot;@drawable/sym_action_add&quot;
		android:title=&quot;details&quot;
		android:showAsAction=&quot;ifRoom|withText&quot; /&gt;
		
&lt;/menu&gt;

With this code:

    image.setOnClickListener(new View.OnClickListener() {
    	@Override
    	public void onClick(View v) {
    		PopupMenu pop = new PopupMenu(getActivity(), v);
    		pop.getMenuInflater().inflate(R.menu.shelves_details_menu, pop.getMenu());
    		pop.show();
   		}
    });

I can&#39;t get the icons to show up, am I missing something?

Is it possible to display icons in a PopupMenu?

I use this method on my container Activity to show a BFrag

    public void showBFrag()
    {
        // Start a new FragmentTransaction
        FragmentTransaction fragmentTransaction = mFragmentMgr.beginTransaction();

        if(mBFrag.isAdded())
        {
            Log.d(LOG_TAG, &quot;Show() BFrag&quot;);
            fragmentTransaction.show(mBFrag);   
        }
        else
        {
            Log.d(LOG_TAG, &quot;Replacing AFrag -&gt; BFrag&quot;);
            fragmentTransaction.replace(R.id.operation_fragments_frame, mBFrag);
        }
        
        // Keep the transaction in the back stack so it will be reversed when backbutton is pressed
        fragmentTransaction.addToBackStack(null);

        // Commit transaction
        fragmentTransaction.commit();        
    }

I call it from my container Activity; for the first time: 

 - gets into the else statement and mBFrag replace mAFrag. 

Then I press the back button:

 - and the operation is reversed (mAFrag is shown but.. does mBFrag is removed?). 

Then I go forward again by calling showBFrag() from the same Activity: 

 - and it gets AGAIN into the else statement. (so I can deduce that mBFrag is NOT ADDED)
 - but I got a **Fragment already added IllegalStateException**... (so why it didn&#39;t get into the if statement instead?)

So:

 1. Why is the isAdded() method not returning TRUE if I&#39;m getting a **Fragment already added IllegalStateException**?? 
 2. Does popBackStack operation completely remove previously added fragments?
 3. What behaviour am I misunderstanding? 

EDIT:
Here is the complete info of the exception.

    06-07 12:08:32.730: ERROR/AndroidRuntime(8576): java.lang.IllegalStateException: Fragment already added: BFrag{40b28158 id=0x7f0c0085}
    06-07 12:08:32.730: ERROR/AndroidRuntime(8576):     at android.app.BackStackRecord.doAddOp(BackStackRecord.java:322)
    06-07 12:08:32.730: ERROR/AndroidRuntime(8576):     at android.app.BackStackRecord.replace(BackStackRecord.java:360)
    06-07 12:08:32.730: ERROR/AndroidRuntime(8576):     at android.app.BackStackRecord.replace(BackStackRecord.java:352)
    06-07 12:08:32.730: ERROR/AndroidRuntime(8576):     at myPackageName.containerActivity.showBFrag() // This line: &quot;fragmentTransaction.replace(R.id.operation_fragments_frame, mBFrag);&quot;





Fragment already added IllegalStateException

I just started with fragment design for HoneyComb. I created two fragments. When i click  a button in the left side fragment, a new fragment is created in right side. Meanwhile when i click a button in the right fragment(ie. DetialsFragment in my code below should be replaced by another fragment.
main.xml

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    android:layout_width=&quot;match_parent&quot;
    android:layout_height=&quot;match_parent&quot;
    android:orientation=&quot;horizontal&quot; &gt;
        &lt;fragment class=&quot;com.fragment.example.Titles&quot;
            android:id=&quot;@+id/titles&quot; android:layout_weight=&quot;1&quot;
            android:layout_width=&quot;0px&quot;
            android:layout_height=&quot;match_parent&quot; /&gt;
        &lt;FrameLayout android:id=&quot;@+id/details&quot; android:layout_weight=&quot;1&quot;
            android:layout_width=&quot;0px&quot;
            android:layout_height=&quot;match_parent&quot; /&gt;
    
    &lt;/LinearLayout&gt;

FragmentExample.java

    public class FragmentExample extends Activity {
    /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
	    }
    }

Titles.java

    public class Titles extends Fragment {
	    public FragmentTransaction ft;
	    @Override
        public View onCreateView(LayoutInflater inflater,
            ViewGroup container, Bundle savedInstanceState) {
		    View v = inflater.inflate(R.layout.main1, null);
	    	Button button1 = (Button)v.findViewById(R.id.button1);
	    	button1.setText(&quot;santhosh&quot;);
	    	button1.setOnClickListener(new OnClickListener() {

			

                @Override
    			public void onClick(View arg0) {
    				// TODO Auto-generated method stub
    				 DetailsFragment details = (DetailsFragment)
    		                    getFragmentManager().findFragmentById(R.id.details);
    		            if (details == null || details.getShownIndex() != 1) {
    		                // Make new fragment to show this selection.
    		                details = DetailsFragment.newInstance(1);
    
    		                // Execute a transaction, replacing any existing
    		                // fragment with this one inside the frame.
    		                ft
    		                        = getFragmentManager().beginTransaction();
    		                ft.add(R.id.details, details, &quot;detail&quot;);
    		                ft.setTransition(
    		                        FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    		                ft.commit();
    		            }
    			}
			
		    });
		    return v;
    	}
    }


DetailsFragment.java

    public class DetailsFragment extends Fragment {
        /**
         * Create a new instance of DetailsFragment, initialized to
         * show the text at &#39;index&#39;.
         */
        Titles title = new Titles();
        String[] titles = {&quot;Title1&quot;, &quot;Title2&quot;, &quot;Title3&quot;, &quot;Title4&quot;};
        public static DetailsFragment newInstance(int index) {
            DetailsFragment f = new DetailsFragment();

            // Supply index input as an argument.
            Bundle args = new Bundle();
            args.putInt(&quot;index&quot;, index);
            f.setArguments(args);

            return f;
        }
    
        public int getShownIndex() {
            return getArguments().getInt(&quot;index&quot;, 0);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater,
            ViewGroup container, Bundle savedInstanceState) {
            if (container == null) {
                // Currently in a layout without a container, so no
                // reason to create our view.
                return null;
            }
            Button button = new Button(getActivity());
            button.setText(&quot;Next&quot;);
            button.setOnClickListener(new OnClickListener() {

        		@Override
        		public void onClick(View v) {
        			// TODO Auto-generated method stub
        		}
            });
            return button;
        }
    }


Android replace the current fragment with another fragment

I&#39;ve been scouring the interwebs (e.g. Android documentation, answers here, etc.) for the answer to what I thought would be a fairly trivial question. How do you achieve a translucent action bar like the ones in [Google Music](http://coreylatislaw.com/wp-content/uploads/2011/07/google-music.png) and [YouTube](http://coreylatislaw.com/wp-content/uploads/2011/07/youtube.png) (links are image examples)?

I want video content to be full screen and not constrained/pushed down by the action bar while still leveraging the benefits of a built in UI component. I can obviously use a completely custom view, but I&#39;d rather leverage the ActionBar if possible.

**Manifest**

    &lt;activity
        android:name=&quot;videoplayer&quot;
        android:theme=&quot;@android:style/Theme.Holo&quot;
        android:launchMode=&quot;singleTop&quot;
        android:configChanges=&quot;keyboardHidden|orientation&quot;/&gt;

**Activity**

    // Setup action bar
    ActionBar actionBar = getActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
    View customActionBarView = getLayoutInflater().inflate(R.layout.player_custom_action_bar, null);
    actionBar.setCustomView(customActionBarView,
                            new ActionBar.LayoutParams(ActionBar.LayoutParams.MATCH_PARENT,
                                                       R.dimen.action_bar_height));
    actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);

**Menu**

    &lt;menu xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
        &lt;item
            android:id=&quot;@+id/button1&quot;
            android:icon=&quot;@drawable/button1&quot;
            android:showAsAction=&quot;always&quot;/&gt;

        &lt;item
            android:id=&quot;@+id/button2&quot;
            android:icon=&quot;@drawable/button2&quot;
            android:showAsAction=&quot;always&quot;/&gt;
    &lt;/menu&gt;

**Custom ActionBar View**

    &lt;LinearLayout
        xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        android:id=&quot;@+id/custom_action_bar&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:orientation=&quot;horizontal&quot;
        android:gravity=&quot;center&quot;
        android:background=&quot;@color/TranslucentBlack&quot;&gt;

        &lt;!--Home icon with arrow--&gt;
        &lt;ImageView
            android:id=&quot;@+id/home&quot;
            android:src=&quot;@drawable/home&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;match_parent&quot;/&gt;

        &lt;!--Another image--&gt;
        &lt;ImageView
            android:id=&quot;@+id/image&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;match_parent&quot;
            android:visibility=&quot;visible&quot;/&gt;

        &lt;!--Text if no image--&gt;
        &lt;TextView
            android:id=&quot;@+id/text&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;match_parent&quot;
            android:gravity=&quot;center_vertical&quot;
            android:visibility=&quot;gone&quot;/&gt;

        &lt;!--Title--&gt;
        &lt;TextView
            android:id=&quot;@+id/title&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;match_parent&quot;
            android:paddingLeft=&quot;20dp&quot;
            android:gravity=&quot;center_vertical&quot;/&gt;
    &lt;/LinearLayout&gt;

All Android 3.0-Honeycomb Solutions on Gang of Coders

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