A `FragmentActivity` is a subclass of `Activity` that was built for the [Android Support Package](http://developer.android.com/sdk/compatibility-library.html). 

The `FragmentActivity` class adds a couple new methods to ensure compatibility with older versions of Android, but other than that, there really isn&#39;t much of a difference between the two. Just make sure you change all calls to `getLoaderManager()` and `getFragmentManager()` to `getSupportLoaderManager()` and `getSupportFragmentManager()` respectively.

`FragmentActivity` is part of the [support library][1], while `Activity` is the framework&#39;s default class. They are functionally equivalent.

You should always use `FragmentActivity` and `android.support.v4.app.Fragment` instead of the platform default `Activity` and `android.app.Fragment` classes. Using the platform defaults mean that you are relying on whatever implementation of fragments is used in the device you are running on. These are often multiple years old, and contain bugs that have since been fixed in the support library.


  [1]: https://developer.android.com/topic/libraries/support-library/index.html

What are the material differences between the new [Azure Web Sites][1] and the traditional Azure Web Roles for an ASP.NET MVC application?  What reason would I choose a &quot;web site&quot; over a &quot;web role&quot; or vice versa?

Let&#39;s assume that I would need equal capacity in either case (e.g. 2 small instances).  The prices seem comparable other than the fact that there is a 33% temporary discount for web sites while they are in their preview period.

Are there things that I can do with a &quot;web site&quot; that are difficulty or impossible with a web role?  For example, does it become easy to put multiple web sites in a single set of VMs using &quot;web sites&quot;?  Do I lose anything with a &quot;web site&quot; vs a &quot;web role&quot;?  Ability to fine tune IIS?  Ability to use the Cache service locally?


  [1]: https://www.windowsazure.com/en-us/home/scenarios/web-sites/

What is the difference between an Azure Web Site and an Azure Web Role

How do I convert a simple list of lists into a numpy array? The rows are individual sublists and each row contains the elements in the sublist.

List of lists into numpy array

I was working on fragments and came across two things `Activity` and `FragmentActivity` which are used several times. I want to know that is there any difference between these two, because when I changed `Activity` with `FragmentActivity`, it had no effect on the app.

Difference between Activity and FragmentActivity

<p>I was working on fragments and came across two things <code>Activity</code> and <code>FragmentActivity</code> which are used several times. I want to know that is there any difference between these two, because when I changed <code>Activity</code> with <code>FragmentActivity</code>, it had no effect on the app.</p>


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?

I have a requirement for obtaining the hardware related information on an Android device that runs my application. I need information of the following sort.

 - CPU Manufacturer, model and serial number
 - SD Card Manufacturer and serial number
 - Camera Manufacturer and other related specs
 - Bluetooth related hardware information
 - WiFi related hardware information
 - RAM Vendor / model
 - Display vendor and model

Any help on this topic would be highly appreciated.


Android: Get Hardware Information Programmatically

I know it seems it&#39;s an already thousand times answered issue but I haven&#39;t found anything that works for me.

I have a MultiLine EditText on Android that adapts to the view size by &quot;playing&quot; with the weight (1) and the height (0dip). I am using gravity &quot;top&quot; but it starts in the middle.

I guess the problem it&#39;s related with the weight. Here&#39;s the code (the parent is a LinearLayout):

        &lt;EditText
            android:id=&quot;@+id/txtContacto&quot;
            android:layout_width=&quot;fill_parent&quot;
            android:layout_height=&quot;0dip&quot;
            android:layout_gravity=&quot;top&quot;
            android:inputType=&quot;textMultiLine&quot; 
            android:weight=&quot;1&quot;&gt;
        &lt;/EditText&gt;

MultiLine EditText in Android with the cursor starting on top

How do I use the `String[] selectionArgs` in `SQLiteDatabase.query()`? I wish I could just set it to `null`, as I have no use for it. I am just trying to load an entire unsorted table from a database into a `Cursor`. Any suggestions on how to achieve this?

Using String[] selectionArgs in SQLiteDatabase.query()

When my fragment starts, I want my edittext to be in focus/let user to just start typing in it.  I am able to get it in focus with requestFocus(), but I cannot get the keyboard to show up.

I have tried both this:

    edit = (EditText) view.findViewById(R.id.search);
    edit.requestFocus();
    InputMethodManager imgr = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
    imgr.showSoftInput(edit, 0);

and

    edit = (EditText) view.findViewById(R.id.search);
    InputMethodManager imgr = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
    imgr.showSoftInput(edit, 0);
    edit.requestFocus();

How can I get the keyboard to show up for EditText?

Show keyboard for edittext when fragment starts

I&#39;m starting a new Activity from my Fragment with

    startActivityForResult(intent, 1);

and want to handle the result in the Fragment&#39;s parent Activity:

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		Log.d(TAG, &quot;onActivityResult, requestCode: &quot; + requestCode + &quot;, resultCode: &quot; + resultCode);
		if (requestCode == 1) {
            // bla bla bla
		}
	}

The problem is that I never got the `requestCode` I&#39;ve just posted to `startActivityForResult()`.

I got something like `0x40001`, `0x20001` etc. with a random higher bit set. The docs don&#39;t say anything about this. Any ideas?

Wrong requestCode in onActivityResult

My question is apart from the obvious inheritance differences, what are the main differences between [`Fragment`][1] and [`FragmentActivity`][2]? To what scenarios are each class best suited? I&#39;m trying to get an understanding of why both of these classes exist...


  [1]: http://developer.android.com/reference/android/app/Fragment.html
  [2]: http://developer.android.com/reference/android/support/v4/app/FragmentActivity.html

What is the difference between Fragment and FragmentActivity?

I have a `GLSurfaceView` set up and rendering as expected using a `GLSurfaceView.Renderer`. My App uses fragments from the android support package. When I navigate to a new fragment `surfaceDestroyed` is called but when I come back to the fragment via the backstack the `GLSurfaceView` will not render, calls to `requestRender` do not result in an `onDraw` call.

I am aware that I need to call `onResume` and `onPause` on the surface view and I am doing this from the hosting fragment but it doesn&#39;t seem to solve the issue. All examples about htis method refer to the activity, could this be the issue? And if so how do you use a `GLSurfaceView` inside a fragment.

Any insight greatly appreciated, I&#39;m happy to post code but it seems to be more of a general question to me,

Thanks

GLSurfaceView inside fragment not rendering when restarted

I&#39;m trying to show a Toast Message when user click on a Button inside a Fragment. The problem is I cannot access the activity to show the Toast on it.

Here&#39;s the source of `Fragment`:

        public class FrgTimes extends Fragment
        {
        	ScrollView sv;
        	public View onCreateView(LayoutInflater inflater, ViewGroup container,
        			Bundle savedInstanceState) 
        	{
        		if (container == null) { return null; }
        
        		sv = (ScrollView)inflater.inflate(R.layout.frg_times, container, false);
     
                btnTime1.setOnClickListener(new OnClickListener() {
    			public void onClick(View v) {

                //******  HERE&#39;s the PROBLEM  ********
    			Toast.makeText(&lt;The Activity&gt;, &quot;Please long press the key&quot;, Toast.LENGTH_LONG );
	
    			}});
    
                return sv;
            }

and Here&#39;s what I&#39;ve been tried.

    Toast.makeText( getActivity()  , ...
    Toast.makeText( getView().getContext()  , ...
    Toast.makeText( getActivity().getApplicationContext()  , ...
    Toast.makeText( sv.getContext()  , ...
    Toast.makeText( sv.getRootView().getContext()  , ...

In Debug I can see that all of these codes run without any exception but no `TOAST` being displayed.



Use Toast inside Fragment

I have a `ViewPager` with three `Fragments`, each one shows a `List` (or `Grid`).

In the new `Android API level 17` (Jelly Bean 4.2), one of the features is [Nested Fragments][1]. The new functionality description says: 

&gt; if you use ViewPager to create fragments that swipe left and right and
&gt; consume a majority of the screen space, you can now insert fragments
&gt; into each fragment page.

So, if I understand right, now I can create a `ViewPager` with `Fragments` (with a button inside for example) inside, and when user press the button show another `Fragment` without loose the `ViewPager` using this new feature.

I&#39;ve expended my morning trying to implement this several different ways, but I can&#180;t get it working... Can somebody add a simple example of how to implement this?

PS: I&#39;m only interested in doing at this way, with `getChildFragmentManager` to learn how works.


  [1]: http://developer.android.com/about/versions/android-4.2.html#NestedFragments

How to add a Fragment inside a ViewPager using Nested Fragment (Android 4.2)

I&#39;m using FragmentActivity and Fragments.

When the application starts:

    FragmentActivity onCreate() &lt;------
    FragmentActivity onStart()
    FragmentActivity onResume()
    Fragment onAttach()
    Fragment onCreate() &lt;------
    Fragment onCreateView()
    Fragment onActivityCreated()
    Fragment onStart()
    Fragment onResume()

Everything is OK, FragmentActivity onCreate() is called before Fragment onCreate().
And when I rotate:

    Fragment onPause()
    FragmentActivity onPause()
    Fragment onStop()
    FragmentActivity onStop()
    Fragment onDestroyView()
    Fragment onDestroy()
    Fragment onDetach()
    FragmentActivity onDestroy()
    ---
    Fragment onAttach()
    Fragment onCreate() &lt;----------
    FragmentActivity onCreate() &lt;---------
    Fragment onCreateView()
    Fragment onActivityCreated()
    Fragment onStart()
    FragmentActivity onStart()
    FragmentActivity onResume()
    Fragment onResume()

Fragment onCreate() is called before FragmentActivity onCreate(). Why is it inconsistent?

In FragmentActivity onCreate() I generate some data, which Fragment onCreate() gets. Because of that strange behaviour I had to move my code from Fragment onCreate() to Fragment onCreateView() to be sure that my data had been generated before.

I&#39;m using FragmentStatePagerAdapter to hold Fragments, maybe that is the reason?

After the rotate, onCreate() Fragment is called before onCreate() FragmentActivity

Here&#39;s the scenario: Activity contains fragment `A`, which in turn uses `getChildFragmentManager()` to add fragments `A1` and `A2` in its `onCreate` like so:

    getChildFragmentManager()
      .beginTransaction()
      .replace(R.id.fragmentOneHolder, new FragmentA1())
      .replace(R.id.fragmentTwoHolder, new FragmentA2())
      .commit()


So far, so good, everything is running as expected.

We then run the following transaction in the Activity: 

    getSupportFragmentManager()
      .beginTransaction()
      .setCustomAnimations(anim1, anim2, anim1, anim2)
      .replace(R.id.fragmentHolder, new FragmentB())
      .addToBackStack(null)
      .commit()

During the transition, the `enter` animations for fragment `B` runs correctly but **fragments A1 and A2 disappear entirely**. When we revert the transaction with the Back button, they initialize properly and display normally during the `popEnter` animation.

In my brief testing, it got weirder - if I set the animations for the child fragments (see below), the `exit` animation runs intermittently when we add fragment `B`

    getChildFragmentManager()
      .beginTransaction()
      .setCustomAnimations(enter, exit)
      .replace(R.id.fragmentOneHolder, new FragmentA1())
      .replace(R.id.fragmentTwoHolder, new FragmentA2())
      .commit()

The effect I want to achieve is simple - I want the `exit` (or should it be `popExit`?) animation on fragment `A` (anim2) to run, animating the whole container, including its nested children. 

Is there any way to achieve that?

**Edit**: Please find a test case [here][1]

**Edit2**: Thanks to @StevenByle for pushing me to keep trying with the static animations. Apparently you can set animations on a per-op basis (not global to the whole transaction), which means the children can have an indefinite static animation set, while their parent can have a different animation and the whole thing can be committed in one transaction. See the discussion below and the [updated test case project][1].

  [1]: https://github.com/BurntBrunch/NestedFragmentsAnimationsTest

Nested fragments disappear during transition animation

I&#39;m writing an app for 4.0 and 4.1 tablets, for which **I do not want to use the support libraries** (if not needed) but the 4.x api only therefore.

So my target platform is very well defined as: &gt;= 4.0 and &lt;= 4.1

The app has a multi-pane layout (two fragments, one small on the left, one content fragment on the right) and an action bar with tabs.

Similar to this:

![enter image description here][1]

Clicking a tab on the action bar changes the &#39;outer&#39; fragment, and the inner fragment then is a fragment with two nested fragments (1. small left list fragment, 2. wide content fragment).

I am now wondering what&#39;s the best practice to replace fragments and especially nested fragments. 
The ViewPager is part of the support library, there&#39;s no native 4.x alternative for this class. Appear to be &#39;deprecated&#39; in my sense.
 - http://developer.android.com/reference/android/support/v4/view/ViewPager.html


Then I read the release notes for Android 4.2, regarding `ChildFragmentManager`, which would be a good fit, but I am targeting 4.0 and 4.1, so this can&#39;t be used either.

`ChildFragmentManager` is only available in 4.2

 - http://developer.android.com/about/versions/android-4.2.html#NestedFragments
 - http://developer.android.com/reference/android/app/Fragment.html#getChildFragmentManager()

Unfortunately, there are hardly any good examples out there that show best practices for fragments usages without the support library, even in the entire Android developer guides; and especially nothing regarding nested fragments.

**So I am wondering: is it simply not possible to write 4.1 apps with nested fragments without using the support library and everything that comes with it? (need to use FragmentActivity instead of Fragment, etc.?)**
Or what would be the best practice?


----------


The problem that I am currently having in the development is exactly this statement:

 - http://developer.android.com/about/versions/android-4.2.html#NestedFragments

&gt; The Android Support Library also now supports nested fragments, so you
&gt; can implement nested fragment designs on Android 1.6 and higher.
&gt; 
&gt; Note: You cannot inflate a layout into a fragment when that layout
&gt; includes a `&lt;fragment&gt;`. Nested fragments are only supported when added
&gt; to a fragment dynamically.

Because I put define the nested fragments in XML, which apparently causes an error like:

    Caused by: java.lang.IllegalArgumentException: Binary XML file line #15: Duplicate id 0x7f090009, tag frgCustomerList, or parent id 0x7f090008 with another fragment for de.xyz.is.android.fragment.CustomerListFragment_


At the moment, I conclude for myself: even on 4.1, when I don&#39;t even want to target the 2.x platform, nested fragments as shown in the screenshot are not possible without the support library.

(This might actually be more of a wiki entry than a question, but maybe somebody else has managed it before).

**Update:**

A helpful answer is at: https://stackoverflow.com/questions/6672066/fragment-inside-fragment/6672688#6672688

  [1]: http://i.stack.imgur.com/Ml3hl.png

Best practice for nested fragments in Android 4.0, 4.1 (&lt;4.2) without using the support library

I just installed the new Android Studio and I&#39;m looking for a way to import the support library for Android.

Where is the option for that? In Eclipse that are just two clicks. I googled for it but found nothing. Surely it is too new.

Add support library to Android Studio project

I am changing my android mobile app to support both tablets and mobile phone. For this I am changing my activity class into fragment. In my activity class I have an instance of my application class created as below:
    
    appCtx = (UnityMobileApp) getApplication();
    
Where `UnityMobileApp` is my Application class.

Now I want to create the same instance in my fragment class. Can you guys please help me solve this?

How to get application object into fragment class

I am not able to reuse fragment in FragmentPagerAdapter.. Using destroyItem() method, It is deleting the fragment but still does not called getItem() again..There are just 2-3 Images so I am using FragmentPagerAdapter Instead of FragmentStatePagerAdapter..

    public class ExamplePagerAdapter extends FragmentPagerAdapter {
    
        ArrayList &lt; String &gt; urls;
        int size = 0;
        public ExamplePagerAdapter(FragmentManager fm, ArrayList &lt; String &gt; res) {
            super(fm);
            urls = res;
            size = urls.size();
        }
    
        @Override
        public int getCount() {
            if (urls == null) {
                return 0;
            } else {
                return size;
            }
    
        }
    
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            FragmentManager manager = ((Fragment) object).getFragmentManager();
            FragmentTransaction trans = manager.beginTransaction();
            trans.remove((Fragment) object);
            trans.commit();
        }
    
        @Override
        public Fragment getItem(int position) {
    
            Fragment fragment = new FloorPlanFragment();
            Bundle b = new Bundle();
            b.putInt(&quot;p&quot;, position);
            b.putString(&quot;image&quot;, urls.get(position));
            Log.i(&quot;image&quot;, &quot;&quot; + urls.get(position));
            fragment.setArguments(b);
            return fragment;
        }
    }
        
And In FragmentActivity,

    pager.setAdapter(new ExamplePagerAdapter(getSupportFragmentManager(), res2)); 



FragmentPagerAdapter getItem is not called

I have a FragmentActivity that hosts a DialogFragment.

The DialogFragment perform network requests and handles Facebook authentication, so I need to retain it during rotation.

I&#39;ve read all the other questions relating to this issue, but none of them have actually solved the problem. 

I&#39;m using putFragment and getFragment to save the Fragment instance and get it again during activity re-creation.

However, I&#39;m always getting a null pointer exception on the call to getFragment in onRestoreInstanceState. I would also like to keep the dialog from being dismissed during rotation, but so far I can&#39;t even retain the instance of it. 

Any ideas what&#39;s going wrong?

Here&#39;s what my code currently looks like:


    public class OKLoginActivity extends FragmentActivity implements OKLoginDialogListener
    {
    
    	private OKLoginFragment loginDialog;
    	private static final String TAG_LOGINFRAGMENT = &quot;OKLoginFragment&quot;;
    
    
    	@Override
    	public void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    
    		FragmentManager fm = getSupportFragmentManager();
    
    		if(savedInstanceState == null)
    		{
    			loginDialog = new OKLoginFragment(); 
    			loginDialog.show(fm, TAG_LOGINFRAGMENT);
    		}
    	}
    
    
    	@Override
    	public void onSaveInstanceState(Bundle outState)
    	{
    		getSupportFragmentManager().putFragment(outState,TAG_LOGINFRAGMENT, loginDialog);
    	}
    
    	@Override
    	public void onRestoreInstanceState(Bundle inState)
    	{
    		FragmentManager fm = getSupportFragmentManager();
    		loginDialog = (OKLoginFragment) fm.getFragment(inState, TAG_LOGINFRAGMENT);
    	}
    
    }


This is the exception stack trace:

    02-01 16:31:13.684: E/AndroidRuntime(9739): FATAL EXCEPTION: main
    02-01 16:31:13.684: E/AndroidRuntime(9739): java.lang.RuntimeException: Unable to start activity ComponentInfo{io.openkit.example.sampleokapp/io.openkit.OKLoginActivity}: java.lang.NullPointerException
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3692)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.app.ActivityThread.access$700(ActivityThread.java:141)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1240)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.os.Handler.dispatchMessage(Handler.java:99)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.os.Looper.loop(Looper.java:137)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.app.ActivityThread.main(ActivityThread.java:5039)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at java.lang.reflect.Method.invokeNative(Native Method)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at java.lang.reflect.Method.invoke(Method.java:511)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at dalvik.system.NativeStart.main(Native Method)
    02-01 16:31:13.684: E/AndroidRuntime(9739): Caused by: java.lang.NullPointerException
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.support.v4.app.FragmentManagerImpl.getFragment(FragmentManager.java:528)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at io.openkit.OKLoginActivity.onRestoreInstanceState(OKLoginActivity.java:62)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.app.Activity.performRestoreInstanceState(Activity.java:910)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1131)
    02-01 16:31:13.684: E/AndroidRuntime(9739): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2158)




Content Type	Original Author	Original Content on Stackoverflow
Question	Rookie	View Question on Stackoverflow
Solution 1 - Android	Alex Lockwood	View Answer on Stackoverflow
Solution 2 - Android	Samuel Peter	View Answer on Stackoverflow

Difference between Activity and FragmentActivity

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

List of lists into numpy array

What is the difference between an Azure Web Site and an Azure Web Role

Attributions