calling a method from a fragment inside a mainactivity - android

I've been trying to solve this problem for a few days now and still cant figure it out. I've checked many similiar topics about this but didnt get me what I need.
As you can see I'm adding the fragments dynamically:
public void displayFragment1() {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new Fragment_1(), "frag1");
fragmentTransaction.commit();
}
public void displayFragment2() {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new Fragment_2(), "frag2");
fragmentTransaction.commit();
}
Here is the part that I cant figure out. I'm searching the fragments by tag and it seems that its not working since I'm always getting nullpointer exception or classexception. Toast just shows the value of the text that I entered so its sending the data from a fragment to the activity. so that part is fine. Any ideas guys???
#Override
public void inputValue(String text) {
if (text != null) {
Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT).show();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new Fragment_2(), "frag2");
fragmentTransaction.commit();
FragmentManager fm = getSupportFragmentManager();
Fragment_2 fragment = (Fragment_2) fm.findFragmentByTag("frag2");
fragment.setChangeTo(text);
} else {
Toast.makeText(MainActivity.this, "didnt recieve the value", Toast.LENGTH_SHORT).show();
}
}
activity main xml
<RelativeLayout
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"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.example.neven.question_for_stackoverflow.MainActivity"
android:background="#drawable/my_background">
<FrameLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragment_container">
</FrameLayout>
MainActivity:
public class MainActivity extends AppCompatActivity implements Fragment_1.sendData {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
displayFragment1();
}
fragment 1 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.neven.question_for_stackoverflow.Fragment_1"
android:background="#drawable/my_background">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="fragment 1"
android:id="#+id/textView" android:layout_gravity="center"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/etInputID" android:layout_gravity="center" android:layout_marginTop="50dp"
android:hint="enter text here" android:textColorHint="#e3ca0a"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send"
android:id="#+id/bSendID" android:layout_gravity="center_horizontal|bottom"
android:layout_marginBottom="130dp"/>
fragment 2 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.neven.question_for_stackoverflow.Fragment_2"
android:background="#drawable/my_background">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="fragment 2 - change me"
android:id="#+id/tvChangeMeID" android:layout_gravity="center"/>


The issue seems to be that you are calling displayFragment1(); in your Activity's onCreate and yet you are expecting to find Fragment_2 which you are only setting/initializing in displayFragment2(); - you never call this method.
So, please change your code in the onCreate method to call displayFragment2() like this:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
displayFragment2();
}
UPDATE:
Please add the call getSupportFragmentManager().executePendingTransactions() after the commit statement and then try looking up the Fragment by TAG and see if this at least returns a Fragment object and not null. Your code will now look like:
...
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, new Fragment_2(), "frag2");
fragmentTransaction.commit();
getSupportFragmentManager().executePendingTransactions()
Fragment_2 fragment = (Fragment_2) getSupportFragmentManager().findFragmentByTag("frag2");
fragment.setChangeTo(text);
I hope this helps.


You should declare a FrameLayout in your Activity's layout xml where the fragments you want will be inflated. Then use that FrameLayout's id when making a transaction instead of android.R.id.content.


The way to handle this is:
Fragment fragment = getActivity().getFragmentManager().findFragmentById(R.id.fragment_container);
if (fragment instanceof YourFragmentClass) {
fragment.setChangeTo(value);
}

Related

In a fragment if I press back button go to SettingsActivity.class

I have a activity_settings.xml file like below in this file I have 3 text views if I click one it will take me to a fragment
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.crowderia.chat.SettingsActivity"
android:background="#color/black">
<TextView
android:id="#+id/tv_added_me"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Added Me" />
<TextView
android:id="#+id/tv_add_friends"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Friends" />
<TextView
android:id="#+id/tv_my_friends"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="My Friends" />
<FrameLayout
android:id="#+id/settings_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</RelativeLayout>
My SettingsActivity.class like below
onclick event for each text view
tv_added_me.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
setFragment(new AddedMeFragment());
}
});
set fragment method
public void setFragment(Fragment f) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out);
fragmentTransaction.replace(R.id.settings_fragment, f);
fragmentTransaction.commit();
}
If I click each text view it will take me to each fragment but after I click back its not going to go to Settings Activity how can I make this work
Please help me Im new to these stuff

You should remove all the fragments from FragmentManager on the click of back button.
FragmentManager fm = getSupportFragmentManager();
for (Fragment f : fm.getFragments()) {
fm.beginTransaction().remove(f).commit();
}

Frame layout inside a fragment

I am working in a Fragment. it contains 2 Buttons and a FrameLayout:
<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="fragments.Fragment_Book_A_Cam">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="2">
<Button
android:id="#+id/bt_Public"
android:layout_width="0dp"
android:layout_height="60dp"
android:layout_weight="1"
android:background="#drawable/red"
android:text="Public Jobs "
android:textColor="#FFFFFF" />
<Button
android:id="#+id/bt_Active"
android:layout_width="0dp"
android:layout_height="60dp"
android:layout_weight="1"
android:background="#drawable/black"
android:text="Active Jobs"
android:textColor="#FFFFFF" />
</LinearLayout>
<FrameLayout
android:id="#+id/Fragment_Jobs_BookACam"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
I want to load another Fragment in the FrameLayout on a Button click and don't want to replace the main FrameLayout.
All the methods I have used either crash or replace the main Fragment.
bt_Public.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// fragment = new Fragment_MyCloudVideo();
// FragmentManager fragmentManager = ;
// FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
// fragmentTransaction.replace(R.id.Fragment_MyVideos, fragment);
// fragmentTransaction.commit();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment_Public_Jobs fragment = new Fragment_Public_Jobs();
fragmentTransaction.addToBackStack("xyz");
fragmentTransaction.hide(Fragment_Book_A_Cam.this);
fragmentTransaction.add(android.R.id.content, fragment);
fragmentTransaction.commit();
}
});

You never seem to use the Fragment_Jobs_BookACam FrameLayout id
If you want to show Fragments inside Fragments, you need to use the method to get the child FragmentManager

First of all correct the errors present in your xml file and try replace() method of fragmentTransaction instead add().

Activity layout is still visible after adding fragment to the activity

This is a really lame question, but I really cannot figure out why it happens, so please help me out.
I have a simple activity and I add a fragment to it dynamically. The problem is that once the fragment is added to the activity, the activity layout is also visible. Why does this happen?
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnLoad = (Button) findViewById(R.id.btn1);
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
HelloFragment hello = new HelloFragment();
fragmentTransaction.add(R.id.rootView, hello, "HELLO");
fragmentTransaction.commit();
}
};
btnLoad.setOnClickListener(listener);
}
}
activity_main.xml
<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="match_parent" tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rootView"
android:orientation="vertical">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>
</LinearLayout>
HelloFragment.java
public class HelloFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
/** Inflating the layout for this fragment **/
View v = inflater.inflate(R.layout.hello_fragment_layout, null);
return v;
}
}
hello_fragment_layout.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">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="fragment 1"/>
</LinearLayout>

Convention is to have a FrameLayout that you use fragmentTransaction.replace()/add() on.
You shouldn't have views like TextView and Button in your MainActivity layout file. Instead, have those in another fragment and just have a FrameLayout in your MainActivity xml. Load the fragment with TextView/Button first, and call replace on button click with your new fragment.

Set a background color to your fragment linearLayout and make it clickable

The fragment is just another element on the layout. Adding it to the layout does not automatically remove other views. If you want the fragment to replace the content of rootView you need to remove rootview's children views first. Something like:
((LinearLayout)findViewById(R.id.rootView)).removeAllViews();
So your onClick method should look like this:
#Override
public void onClick(View v) {
((LinearLayout)findViewById(R.id.rootView)).removeAllViews();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
HelloFragment hello = new HelloFragment();
fragmentTransaction.add(R.id.rootView, hello, "HELLO");
fragmentTransaction.commit();
}

your rootview work as container for both fragment and your views on activity. check it and make separate view for fragment.

I know it's very late to answer this question but for those who are still looking do the following in your activity layout:
<RelativeLayout
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=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rootView"
android:orientation="vertical">
</RelativeLayout>
And fragment layout to following:
<?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:background="#color/white" <!--Add this-->
android:layout_height="match_parent">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>

activity_main.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" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rootView"
android:orientation="vertical">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>
<FrameLayout
android:id="#+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
</FrameLayout>
MainActivity.java
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
HelloFragment hello = new HelloFragment();
fragmentTransaction.add(R.id.fragmentContainer, hello, "HELLO");
fragmentTransaction.commit();
}
};

I have a solution for this to achieve what you can do is make two fragment one for textview and button your showing as default when activity is opened and another which you have already created as HelloFragment.
From Activity onCreate() method call the first fragment with default textview and button and from the click listener of that button call HelloFramgent.
Step1: Crate another fragment with any name MainFragment having a xml layout as follows:-
main_fragment_layout.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">
<TextView
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btn1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="OK"/>
</LinearLayout>
MainFragment.java - Class
public class MainFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
/** Inflating the layout for this fragment **/
View v = inflater.inflate(R.layout.main_fragment_layout, container, false);
Button btnLoad = (Button) v.findViewById(R.id.btn1);
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View view) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
HelloFragment hello = new HelloFragment();
fragmentTransaction.add(R.id.rootView, hello, "HELLO");
fragmentTransaction.commit();
}
};
btnLoad.setOnClickListener(listener);
return v;
}
}
Step2: Call the MainFragment from activity onCreate() method
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
MainFragment mainFragment = new MainFragment();
fragmentTransaction.add(R.id.rootView, mainFragment, "MAIN_FRAGMENT");
fragmentTransaction.commit();
}

Build your user interface in Fragments (In most cases one Fragment equals one screen) and then use Activities to arrange and display those Fragments.
check this: click here to view detailed answer

You have two linear layouts, one inside another, so you need to do the following steps:
Set id to 1 linear layout rootView and next to the childview.
Find your child view:
View view = findViewById(R.id.child_view);
view.setVisibility(View.INVISIBLE);
Replace your rootView with your fragment:
getSupportFragmentManager().beginTransaction().add(R.id.rootview, new blankFragment())
.addToBackStack(null).commit();
Then override:
#override
public void onBackPressed() {
android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
view.setVisibility(View.VISIBLE);
}
super.onBackPressed();
}

The Activity views are not being masked against the Fragment's views, so both appear. One solution is to load the fragment into a frame in the main activity's layout which has a slight elevation (2 dp). When the fragment is loaded its base elevation will cause it to always draw over the activity. Set the fragments parent container with a color to hide the activity views.
MasterActivity layout:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Activity Title"
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"
android:textSize="24sp" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/title"
android:layout_centerHorizontal="true"
android:textAllCaps="false"
android:text="Button1" />
<Button
android:id="#+id/button2"
android:textAllCaps="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/button1"
android:layout_centerHorizontal="true"
android:text="Button2" />
<!-- Fragment holder, with elevation -->
<FrameLayout
android:translationZ="2dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragHolder"
/>
The Fragment layout has a background color:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff"
android:layout_margin="10dp">
<TextView
android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Test Background Task"
android:textSize="24sp" />
</RelativeLayout>

Make your First Layout invisible while calling fragment and again while returning from fragment make your main view visible and remove fragment at that time so it will not conflict with each other it worked for really well just check it once

Android fragments added in wrong order after screen orientation change

I am having a problem with fragment ordering when the screen orientation changes during a custom animation of my fragment transition.
If I rotate the screen at exactly the right time, the fragments are added with the MyFragment2 in the position where MyFragment1 should be.
I am adding my fragments as follows:
final FragmentManager fm = activity.get().getFragmentManager();
final FragmentTransaction ft = fm.beginTransaction();
ft.setCustomAnimations(
R.animator.slide_in_left,
R.animator.slide_out_top,
R.animator.slide_in_bottom,
R.animator.slide_out_right);
ft.replace(R.id.container,
MyFragment1.newInstance(), MyFragment1.TAG);
ft.add(R.id.container,
MyFragment2.newInstance(),MyFragment12.TAG)
.addToBackStack(null)
.commit();
I have been searching for many hours for information about this problem. I have seen information here Android multiple fragment transaction ordering, here https://code.google.com/p/android/issues/detail?id=69403&thanks=69403&ts=1399482444 and here https://code.google.com/p/android/issues/detail?id=31116
My understanding is that this is a bug with re-adding fragments during onResume() of an activity.
How can I prevent my Activity from incorrectly ordering my fragments when it is resumed?
My Activity layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity"
tools:ignore="MergeRootFrame" />

I had the same issue, the following workaround helped:
#Override
public void onResume() {
super.onResume();
bringToFrontIfNeeded();
}
#Override
public void onBackStackChanged() {
bringToFrontIfNeeded();
}
private void bringToFrontIfNeeded() {
// A fix for a weird google bug
if (amIOnTop() && (getView() != null)) {
getView().bringToFront();
}
}
private void amIOnTop() {
// depends on you app logic, can be something like
FragmentManager manager = getFragmentManager();
int count = manager.getBackStackEntryCount();
return (BACK_STACK_ENTRY_NAME.equals(manager.getBackStackEntryAt(count - 1).getName()));
}

try adding the fragment in the activity xml layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<fragment android:name="com.example.android.fragments.HeadlinesFragment"
android:id="#+id/headlines_fragment"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<fragment android:name="com.example.android.fragments.ArticleFragment"
android:id="#+id/article_fragment"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>

Why findFragmentById returns the old fragment was in before the call to replace FragmentLayout?

Why after changing fragments from the first(pageNews) to the second(pageViewFromWeb) "findFragmentById" returns a reference to the first(pageNews) fragment?
layout:
<RelativeLayout 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=".MainActivity"
android:paddingTop="10dp"
android:background="#000">
<FrameLayout
android:id="#+id/frgmCont"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000">
</FrameLayout>
</RelativeLayout>
code:
fTrans = getSupportFragmentManager().beginTransaction();
fTrans.add(R.id.frgmCont, pageNews);
....
....
public void selectNews(String news_id) {
// Toast.makeText(this, news_id, Toast.LENGTH_SHORT).show();
fTrans = getSupportFragmentManager().beginTransaction();
fTrans.replace(R.id.frgmCont, pageViewFromWeb);
fTrans.commit();
Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.frgmCont);
...
}

Its because replace() does not execute immediately, but the FragmentTransaction is scheduled. When you findFragmentById() immediately after replacing fragments, they are not replaced yet...

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