Develop Reference

Nested fragments - Screen of Frag2 stays empty

I'm suffering through nested fragments. I have a mainactivity which calls a fragment 1 which in turns call a fragment via a button. The fragment frag2 is well instantiated but the screen is blank.
Is there something obvious with my code?
MainActivity
import android.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager;
Frag1 f1 = new Frag1();
fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame,
f1).commit();
}
}
mainactivity xml
<?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.narb.nestedfragments.MainActivity">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>
Fragment 1 and its xml layout:
import android.app.FragmentTransaction;
import android.content.Context;
import android.os.Bundle;
import android.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.RelativeLayout;
/**
* A simple {#link Fragment} subclass.
*/
public class Frag1 extends android.app.Fragment {
Context context;
private Button back1;
RelativeLayout rl1;
public Frag1() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootview = null;
rootview = inflater.inflate(R.layout.fragment_frag1, container, false);
return rootview;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
context = getActivity().getApplicationContext();
initFindView();
back1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.i("frag1","createdview");
//getActivity().getFragmentManager().popBackStackImmediate();
rl1.setVisibility(View.INVISIBLE);
FragmentTransaction ft = getFragmentManager().beginTransaction();
Frag2 f2 = new Frag2();
ft.replace(R.id.fl1, f2);
ft.addToBackStack(null);
ft.commit();
}
});
}
private void initFindView(){
back1 = (Button) getActivity().findViewById(R.id.btn1);
rl1 = (RelativeLayout) getActivity().findViewById(R.id.rl1);
}
}
Is it normal that I need to make my layout frag 1 invisible before calling frag2?
and finally my fragment 2 and its layout. I see the log for frag 2 but the screen is empty:
import android.app.Fragment;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
public class Frag2 extends Fragment {
Context context;
private Button btn2;
public Frag2() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootview;
rootview = inflater.inflate(R.layout.fragment_frag2, container, false);
Log.i("frag2","createdview");
return rootview;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
context = getActivity().getApplicationContext();
Log.i("frag2","onactivitycreated");
btn2 = (Button) getActivity().findViewById(R.id.btn2);
btn2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.i("frag2","onactivitycreated");
}
});
}
}
<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="com.narb.nestedfragments.Frag2">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Test 2" />
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="60dp"
android:text="back"
/>
</RelativeLayout>

if your fragment 1 is having another FrameLayout where you are replacing fragment 2, then instead of getFragmentManager(), use getChildFragmentManager() in fragment 1
otherwise you are passing wrong container id in replace() method R.id.fl1 inside fragment1. you should pass R.id.content_frame there.

You have not posted the fragment1 XML Code. lets assume RelativeLayout (rl1) is your parent layout and you have FrameLayout (fl1) inside the rl1. You are making the parent layout invisible. So the fragment2 can't be visible.
If you don't want to show the fragment1 while showing there is no need for the nested fragment.
You should call like this to load second fragment.
getFragmentManager().beginTransaction()
.replace(R.id.content_frame ,new Frag2());
.addToBackStack(null);
.commit();

use content_frame id of activity_main in Frag1 class
back1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.i("frag1", "createdview");
//getActivity().getFragmentManager().popBackStackImmediate();
rl1.setVisibility(View.INVISIBLE);
FragmentTransaction ft = getFragmentManager().beginTransaction();
Frag2 f2 = new Frag2();
ft.replace(R.id.content_frame, f2);
ft.addToBackStack(null);
ft.commit();
}
});

Error in Fragment Transaction

I have just started with android fragment and git stuck while implementing an example from internet.Attaching the following code below.It would be really grate to get some help.
I am getting a error at the line ft.add(R.id.fragmentone,fragment).
Regards.
MainActivity.java
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void getfragment(View view) {
FragmentOne fragment = new FragmentOne();
FragmentManager fm=getFragmentManager();
FragmentTransaction ft=fm.beginTransaction();
ft.add(R.id.fragmentone,fragment);
}
}
FragmentOne.java
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentOne extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_fragment_one, container,false);
}
}
Activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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.vighnesh.fragmentsexp.MainActivity"
android:orientation="vertical">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/buttonfragment"
android:layout_margin="20dp"
android:text="Click to open fragment"/>
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragmentone"
android:layout_margin="20dp">
</fragment>
</LinearLayout>
fragment_fragment_one.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.vighnesh.fragmentsexp.FragmentOne">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment" />
</FrameLayout>

Replace this code in your activity.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getfragment();
}
public void getfragment() {
FragmentOne fragment = new FragmentOne();
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.fragmentone, fragment);
ft.commit();
}

change it.
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnFragOne = (Button)findViewById(R.id.buttonfragment);
btnFragOne.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentOne fragment = new FragmentOne();
FragmentManager fm=getFragmentManager();
FragmentTransaction ft=fm.beginTransaction();
ft.add(R.id.fragmentone,fragment); getfragment();
}
});
}
}

So use getSupportFragmentManager() instead of getFragmentManager()
Because the FragmentOne is from the support library (android.support.v4.app.Fragment) not from the framework (android.app.Fragment), you need to use android.support.v4.app.FragmentManager to do transaction with FragmentOne.

java.lang.IllegalStateException: Activity has been destroyed at Calling fragment inside another fragment to replace on framelayout

I am new to android and learning fragment instead of multiple, i have problem. when i call planet fragment from friends "java.lang.IllegalStateException: Activity has been destroyed" android runtime FATAL exception occurs here is my code. i saw this page but couldn't figure out how to use it. I will be grateful for any help
fragment_planet.xml
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:gravity="center"
android:padding="32dp" />
Friends.java
package com.app.hubara;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Friends extends Fragment {
public Friends() { }
View rootView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.content_friends, container, false);
MainActivity main = new MainActivity();
main.friends();
return rootView;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="100dp"/>
<Button
android:id="#+id/display"
android:height="70dp"
android:width="300dp"
android:layout_marginTop="0dp"
android:text="Display"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
MainActivity
package com.app.hubara;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import java.util.Locale;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
FragmentManager fragmentManager;
FragmentTransaction fragmentTransaction;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) findViewById(R.id.display);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Friends frag_friends = new Friends();
fragmentManager = getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.content_frame, frag_friends);
fragmentTransaction.commit();
}
});
}
public void friends(){
PlanetFragment planetFragment = new PlanetFragment();
fragmentManager = getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.content_frame, planetFragment);
fragmentTransaction.commit();
}
public static class PlanetFragment extends Fragment {
public PlanetFragment() { }
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
int i = getArguments().getInt("Earth");
String planet = getResources().getStringArray(R.array.planets_array)[i];
int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
"drawable", "Earth");
((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
getActivity().setTitle(planet);
return rootView;
}
}
}

To access an Activity, you shouldn't do this:
MainActivity main = new MainActivity();
main.friends();
Because this destroys current Activity then instantiates another new Activity.
You can access it appropriately by calling getActivity():
MainActivity main = getActivity();
main.friends();
Note that actually you are recommended to define and use an interface to communicate between Fragment and Activity. If you want to learn further, please refer to the official training.

Drawer menu view requires 2 clicks

A repo with example: https://bitbucket.org/troffel/drawer-button-error
I've come across an issue I can't for the life of me figure out. From a much larger project I was able to deduce it into a smaller dummy project.
Problem:
When the app launches, the buttons in the drawer menu works correctly. However, after changing orientation one or more times the buttons all of a sudden require two key presses.
When logging out events, it shows that the eventlistener connected to the clicked views is triggered, however nothing seem to happen on first click.
I added the main files to the post, repo so you can replicate it if interested.
Any help is much appreciated.
Main layout:
</LinearLayout>
<LinearLayout
android:id="#+id/left_drawer"
android:orientation="vertical"
android:layout_width="300dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#android:color/background_light">
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
layout of initial fragment(category_fragment):
<ListView
android:id="#+id/left_drawer_listview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:choiceMode="singleChoice"/>
<View
android:layout_height="1dp"
android:layout_width="match_parent"
android:background="#ecebec"/>
<TextView
android:id="#+id/drawer_settings"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textColor="#android:color/black"
android:textSize="20sp"
android:clickable="true"
android:onClick="openSettings"
android:gravity="center_vertical"
android:text="Settings"
android:paddingLeft="10sp"/>
</LinearLayout>
fragment that replaces the initial(preffragment):
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="#+id/settings_checkbox_container"
android:layout_weight="1">
</LinearLayout>
<Button
android:layout_width="match_parent"
android:layout_height="100dp"
android:id="#+id/settings_back"
android:text="Save"
android:layout_weight="1"/>
</LinearLayout>
Mainactivity:
package com.example.testdrawer;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.left_drawer, new CategoryFragment());
fragmentTransaction.commit();
}
public void openSettings(View v){
FragmentManager fmanager = getSupportFragmentManager();
FragmentTransaction ftrans = fmanager.beginTransaction();
PrefFragment prefFragment = new PrefFragment();
ftrans.replace(R.id.left_drawer, prefFragment);
ftrans.commit();
Log.i("test", "Opening settings");
}
}
categoryfragment code:
package com.example.testdrawer;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class CategoryFragment extends Fragment{
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View v = inflater.inflate(R.layout.category_fragment, container, false);
//drawer menu
return v;
}
}
Preffragment.java:
package com.example.testdrawer;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
public class PrefFragment extends Fragment{
private Context context;
private View checkbox_container;
private Button settingsBack;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = getActivity().getApplicationContext();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.preffragment, container, false);
checkbox_container = v;
settingsBack = (Button) v.findViewById(R.id.settings_back);
settingsBack.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
saveSettings();
}
});
//setupSimplePreferencesScreen();
return v;
}
public void saveSettings(){
//setSettings(checkbox_container);
FragmentManager fmanager = getFragmentManager();
FragmentTransaction ftrans = fmanager.beginTransaction();
ftrans.replace(R.id.left_drawer, new CategoryFragment());
ftrans.commit();
Log.i("test", "saving settings");
}
}

OK! This is super weird, but I found the problem.
Using replace(container, fragment) instead of add(container, fragment) in my solved the issue.
The problem was that I was calling add(container, fragment) in my activitys onCreate method. This meant that when an orientation change happened, it would call add(container, fragment) on top of the already existing one.
replace(container, fragment) works because it, logically, replaces the existing one.
A solution that includes using add(container, fragment) would be to have remove(fragment) in my activitys onDestroy method, thus avoiding doable drawing.
Hope it saves someone else some time!

Fixed Tabs in the same view

I'm new in Android. I wanna create an application that shows an action bar with fixed tabs. I've reached to do this.
The problem is that the tabs don`t fit in the same view.
This is my Main Activity:
package com.pestana.pestana;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuInflater;
import android.app.ActionBar;
import android.app.Fragment;
public class MainActivity extends Activity {
// Declare Tab Variable
ActionBar.Tab Tab1, Tab2, Tab3,Tab4;
Fragment fragmentTab1 = new FragmentTab1();
Fragment fragmentTab2 = new FragmentTab2();
Fragment fragmentTab3 = new FragmentTab3();
Fragment fragmentTab4 = new FragmentTab4();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getActionBar();
// Hide Actionbar Icon
//actionBar.setDisplayShowHomeEnabled(false);
// Hide Actionbar Title
//actionBar.setDisplayShowTitleEnabled(false);
// Create Actionbar Tabs
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Set Tab Icon and Titles
Tab1 = actionBar.newTab().setIcon(R.drawable.tab1);
Tab2 = actionBar.newTab().setText("Tab2");
Tab3 = actionBar.newTab().setText("Tab3");
Tab4 = actionBar.newTab().setText("Tab4");
// Set Tab Listeners
Tab1.setTabListener(new TabListener(fragmentTab1));
Tab2.setTabListener(new TabListener(fragmentTab2));
Tab3.setTabListener(new TabListener(fragmentTab3));
Tab4.setTabListener(new TabListener(fragmentTab4));
// Add tabs to actionbar
actionBar.addTab(Tab1);
actionBar.addTab(Tab2);
actionBar.addTab(Tab3);
actionBar.addTab(Tab4);
}
#Override public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true; /** true -> el menú ya está visible */
}
}
And this is the layout
`
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment_container"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
`
I've created also 4 classes for FragmentTab1... FragmentTab4,
FragmentTab1
package com.pestana.pestana;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Fragment;
public class FragmentTab1 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab1, container, false);
return rootView;
}
}
FragmentTab2
package com.pestana.pestana;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Fragment;
public class FragmentTab2 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab2, container, false);
return rootView;
}
}
FragmentTab3
package com.pestana.pestana;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Fragment;
public class FragmentTab3 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab3, container, false);
return rootView;
}
}
FragmentTab4
package com.pestana.pestana;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Fragment;
public class FragmentTab4 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab4, container, false);
return rootView;
}
}
TabListener.java
package com.pestana.pestana;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Fragment;
import android.app.FragmentTransaction;
public class TabListener implements ActionBar.TabListener {
Fragment fragment;
public TabListener(Fragment fragment) {
// TODO Auto-generated constructor stub
this.fragment = fragment;
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
ft.replace(R.id.fragment_container, fragment);
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
ft.remove(fragment);
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
4 XML layout for each fragment this is an example, just have to change Fragment1 for each XML
<?xml version="1.0" encoding="utf-8"?>
<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" >
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/Fragment1" />
</RelativeLayout>
I am stuck for 3 days, any help please?? With the same code can I implement a swipe view with the different tabs?? Thanks in advance

Check the documentation (Creating Swipe Views with Tabs), you can download a working example of how to do exactly what you want.