Develop Reference

YouTube Player Inside Tabbed Activity

I'm creating an app with tabbed activity and I want to put YouTube player on third tab.
Currently I have this java code :
public class FragmentTutorial extends Fragment {
public FragmentTutorial() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_tutorial, container, false);
}
}
and here's my XML :
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.examplecom.FragmentTutorial">
</FrameLayout>
my question is...
most tutorials out there try to use this extends statement :
public class FragmentTutorial extends YouTubeBaseActivity {
in my case, I still need Fragment as extends statement. My code won't run if it changed into YouTubeBaseActivity.
any idea how to have youtube player inside fragment, specially in tabbed activity like this?
thank you

Your FragmentTutorial should extend YouTubePlayerFragment.

Android how do i acces elements in a fragment?

I've got an activity that loads 2 different fragments and switches between them when needed. The problem is I cant acces any elements that are in the fragments. I need to be able to set the typeface and text in the toolbar as well as be able to set the checkboxes.
fragment XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="3">
<include
layout="#layout/toolbar_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:id="#+id/cycle_button"
android:button="#null"
android:background="#drawable/cycle"
android:layout_weight="1"
android:layout_gravity="center_vertical" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:id="#+id/walk_button"
android:button="#null"
android:background="#drawable/walk"
android:layout_weight="1"
android:layout_gravity="center_vertical" />
java file:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
TextView appTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
appTitle.setText("title");
CheckBox cycle = (CheckBox) getView().findViewById(R.id.cycle_button);
CheckBox walk = (CheckBox) findViewById(R.id.walk_button);
}
the findViewById doesn't work on the fragment and it just keeps returning null.

You could send the desired values for your elements from your activity to the fragment when you're instantiating them.
But there are several methods you can choose to communicate between your activity and a fragment:
Therefore have a look at the guide Communicating with Fragments
1.) Bundle - Activity can construct a fragment and set arguments
2.) Methods - Activity can call methods on a fragment instance
3.) Listener - Fragment can fire listener events on an activity via an interface
Especially a Fragment with Arguments would be helpful to you:
In certain cases, your fragment may want to accept certain arguments.
A common pattern is to create a static newInstance method for creating
a Fragment with arguments. This is because a Fragment must have only a
constructor with no arguments. Instead, we want to use the
setArguments method such as:
public class DemoFragment extends Fragment {
// Creates a new fragment given an int and title
// DemoFragment.newInstance(5, "Hello");
public static DemoFragment newInstance(int someInt, String someTitle) {
DemoFragment fragmentDemo = new DemoFragment();
Bundle args = new Bundle();
args.putInt("someInt", someInt);
args.putString("someTitle", someTitle);
fragmentDemo.setArguments(args);
return fragmentDemo;
}
}
This sets certain arguments into the Fragment for later access within > onCreate. You can access the arguments later by using:
public class DemoFragment extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get back arguments
int SomeInt = getArguments().getInt("someInt", 0);
String someTitle = getArguments().getString("someTitle", "");
}
}
Now we can load a fragment dynamically in an Activity with:
// Within the activity
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
DemoFragment fragmentDemo = DemoFragment.newInstance(5, "my title");
ft.replace(R.id.your_placeholder, fragmentDemo);
ft.commit();
This pattern makes passing arguments to fragments for initialization fairly straightforward.
After instantiating your fragment you can go ahead and retrieve your desired views from the fragment's layout during inflating and set the values included in the fragment's arguments.
public class DemoFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
final View view = inflater.inflate(R.layout.your_fragment_layout, container, false);
// Retrieve views here via findElementById etc.. and set the attributes from the fragment's arguments
return view;
}
}

In Fragment:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle avedInstanceState) {
View rootView = inflater.inflate(R.layout.yourlayout, null);
Toolbar toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
//...[other views get here]...
return rootView;
}

In fragment view creation is done in .onCreateView() method.
You can use ViewHolder pattern- save references to all views for accessing them in a future.
If you want to access activity from fragment, define interface in fragment and implement it in activity, so you can make a call like:
((MyInterface) getActivity()).changeToolbar()
For passing values into fragment use static method when you create fragement. Bear in mind, that data use pass must implement Parceleable interface

How to set an Activity's root view as fragment in Android?

I have a Fragment, and I want to set that whole fragment as root view of my activity. I have everything ready, and I'm instantiating my fragment programatically. I've tried (in my activity):
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FeedFragment fragment = [...];
setContentView(fragment.getView());
}
But I've got a null pointer exception. In other words, how can I make my fragment act like an activity? I only target ICS+, I don't need to support older versions, if it makes any difference.

Try this
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.all_lecturer_frag, container, false);
......
return rootView;
}

A Fragment, by design, is intended to be a tool to help you reuse screen space and as such, fragments have to be present inside a container. So while a fragment cannot technically be a root view, you can have a fragment be the only view inside the Activity. For this, you should inflate the view for your fragment programmatically inside the onCreateView() method of the fragment. then you could have something like this in your activity's layout xml:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.package.fragment_name
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</FrameLayout>
And then, within your activity, all you have to do is:
setContentView(R.layout.main);
Since, the fragment is defined in the layout xml, it cannot be removed from the activity's layout (although the layout itself can be changed) and is tied to it.
Also, on a side note, notice that the root view is a FrameLayout and not the fragment itself. But in this manner, your fragment can be tied to the activity. But don't forget that the Fragment will still retain it's lifecycle separate from the activity's.
EDIT: If you need to create your fragment instance programmatically, you have to do:
getFragmentManager().beginTransaction().add(R.id.frame_layout, your_fragment).commit();
This is the only way to add your fragment programmatically. But also keep in mind that the Fragment's layout is not tied to the activity's layout. But you can use the Fragment's lifecycle to behave similarly as an Activity.

#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.xxx);
//initializations...
if (savedInstanceState == null) {
// During initial setup, plug in the fragment.
YourFragment details = new YourFragment();
getFragmentManager().beginTransaction().add(R.id.your_root_frame_layout, details).commit();
}
}

Use view from fragment xml file

I have an activity with several tabs (using the 'fixed tabs + swipe' style). Each tab layout is defined as a fragment xml file.
Eg, my activity is called ModifyCustActivity. This uses an almost-empty xml file called activity_modify_cust.xml. Each tab on this page is represented by various xml files such as fragment_modify_cust_basic and fragment_modify_cust_address etc etc. Each of these fragment xml files contains EditTexts, Spinners and more.
When the activity starts, I need to be able to access these views from the activity code, as I need to pre-populate them, and get their results once they are edited. However, because these views exist in a fragment xml file, I don't seem to be able to reach them in code. Is there a way to access a view contained in a fragment xml file?

Is there a way to access a view contained in a fragment xml file?
Yes it is, but your fragment should be declared in the XML layout file, which seems to be your case.
For example:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
...">
<fragment
android:name="com.example.MyFragment"
android:id="#+id/my_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
And you would access the fragment like this:
FragmentManager manager = getSupportFragmentManager();
MyFragment fragment = (MyFragment)manager.findFragmentById(R.id.my_fragment);
Then using the fragment instance you could further access your views, for example by calling a public method from the fragment which updates some particular view.
UPDATE:
Suppose you have a TextView that appears in layout of the fragment, and need to update from the activity.
Let this be the fragment class:
public class MyFragment extends Fragment{
private TextView textView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_layout, null, false);
textView = (TextView)view.findViewById(R.id.textView);
return view;
}
public void updateTextView(String text){
textView.setText(text);
}
}
Then you would update the TextView by calling in your activity the updateTextView() method:
fragment.updateTextView("text");

You can reach fragments views from activity. If you want to send a data from fragment to another fragment. Your sender fragment must communicate with activity and your activity can manipulate the view in other fragment
http://developer.android.com/training/basics/fragments/communicating.html

findViewById returns NULL when using Fragment

I'm new to Android developing and of course on Fragments.
I want to access the controls of my fragment in main activity but 'findViewById' returns null.
without fragment the code works fine.
Here's part of my code:
The fragment:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:ignore="HardcodedText" >
<EditText
android:id="#+id/txtXML"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:ems="10"
android:scrollbars="vertical">
</EditText>
</LinearLayout>
the onCreate of MainActivity:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.initialisePaging();
EditText txtXML = (EditText) findViewById(R.id.txtXML);}
on this point the txtXML is null.
What's Missing in my code or what should I do?

Try like this on your fragments on onCreateView
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (container == null) {
return null;
}
LinearLayout ll = (LinearLayout )inflater.inflate(R.layout.tab_frag1_layout, container, false);
EditText txtXML = (EditText) ll.findViewById(R.id.txtXML);
return ll;
}

You should inflate the layout of the fragment on onCreateView method of the Fragment then you can simply access it's elements with findViewById on your Activity.
In this Example my fragment layout is a LinearLayout so I Cast the inflate result to LinearLayout.
public class FrgResults extends Fragment
{
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
//some code
LinearLayout ll = (LinearLayout)inflater.inflate(R.layout.frg_result, container, false);
//some code
return ll;
}
}

I'm late, but for anyone else having this issue. You should be inflating your view in the onCreateView method. Then override the onCreateActivity method and you can use getView().findViewById there.
#Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment, container, false);
}

You can't access the the view of fragment in activity class by findViewById instead what you can do is...
You must have an object of Fragment class in you activity file, right? create getter method of EditText class in that fragment class and access that method in your activity.
create a call back in Fragment class on the event where you need the Edittext obj.

1) Try this:
Eclipse menu -> Project -> Clean...
update
2) If you have 2 or more instances of 'main' layout, check if all of them have a view with 'txtXML' id
3)
A Fragment is a piece of an application's user interface or behavior that can be placed in an Activity. Interaction with fragments is done through FragmentManager, which can be obtained via Activity.getFragmentManager() and Fragment.getFragmentManager().
The Fragment class can be used many ways to achieve a wide variety of results. It is core, it represents a particular operation or interface that is running within a larger Activity. A Fragment is closely tied to the Activity it is in, and can not be used apart from one. Though Fragment defines its own lifecycle, that lifecycle is dependent on its activity: if the activity is stopped, no fragments inside of it can be started; when the activity is destroyed, all fragments will be destroyed.
Study this. you must use FragmentManager.

If you want use findViewById as you use at activities onCreate, you can simply put all in overrided method onActivityCreated.

All the answers above tell you how you should "return the layout" but don't exactly tell you how to reference the layout that was returned so I was unable to use any of the solutions given. I used a different approach to solve the problem. In the Fragment class that handles the fragment, got to the onViewCreated() class and create a context variable in it that saves the context of the parent activity (main activity in my case).
public void onViewCreated(#NonNull View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
Context fragmentContext = (MainActivity) view.getContext();
}
Once that is done, you can use the new context to access items on your fragment from inside the onViewCreated() method.
EditText editText = context.findViewById(R.id.textXML);