Develop Reference

ViewPager on TabLayout not Showing?

I am just doing my Daily practice and I had a Problem. I've created Viewpager on Tab Layout but it not worked.
I don't know why, I am just doing like the tutorial on the internet and spend for this problem 2 days. :/
The Tablayout showing all tabs but not with the view (fragment tab).
I'll thank for any help from you all :))))))))
So, here's what I code,
content_home.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView 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:id="#+id/content_home"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".ui.home.ViewPagerActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.tabs.TabLayout
android:id="#+id/content_home_tablayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabBackground="#color/colorPrimaryAlternate"
app:tabGravity="fill"
app:tabMode="fixed"
app:tabIndicatorColor="#color/colorPrimary"
app:tabSelectedTextColor="#color/colorPrimary"
app:tabTextColor="#color/colorPrimaryDarkAlternate"
app:tabIconTint="#color/tab_color_selector"
app:tabTextAppearance="#style/tabAllCaps">
<com.google.android.material.tabs.TabItem
android:id="#+id/tab1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:icon="#drawable/ic_waterpark"
android:text="#string/waterpark" />
<com.google.android.material.tabs.TabItem
android:id="#+id/tab2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:icon="#drawable/ic_home_black_24dp"
android:text="#string/drypark" />
<com.google.android.material.tabs.TabItem
android:id="#+id/tab3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:icon="#drawable/ic_human_male_female"
android:text="#string/facilities" />
</com.google.android.material.tabs.TabLayout>
<androidx.viewpager.widget.ViewPager
android:id="#+id/content_home_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/content_home_tablayout"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_alignParentBottom="true" />
</LinearLayout>
</androidx.core.widget.NestedScrollView>
ViewPagerActivity:
package com.ardityo.android.transeraapps.ui.home;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;
import com.ardityo.android.transeraapps.R;
import com.ardityo.android.transeraapps.ui.home.tabs.drypark.DryParkFragment;
import com.ardityo.android.transeraapps.ui.home.tabs.facilities.FacilitiesFragment;
import com.ardityo.android.transeraapps.ui.home.tabs.waterpark.WaterParkFragment;
import com.google.android.material.tabs.TabLayout;
public class ViewPagerActivity extends AppCompatActivity {
private TabLayout tabLayout;
private ViewPager viewPager;
ViewPagerAdapter adapter;
WaterParkFragment waterParkFragment;
DryParkFragment dryParkFragment;
FacilitiesFragment facilitiesFragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_home);
viewPager = (ViewPager) findViewById(R.id.content_home_viewpager);
viewPager.setOffscreenPageLimit(3);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.content_home_tablayout);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager)
{
adapter = new ViewPagerAdapter(getSupportFragmentManager());
// waterParkFragment=new WaterParkFragment();
// dryParkFragment=new DryParkFragment();
// facilitiesFragment=new FacilitiesFragment();
// adapter.addFragment(waterParkFragment,"WaterPark");
// adapter.addFragment(dryParkFragment,"DryPark");
// adapter.addFragment(facilitiesFragment.newInstance(),"Facilities");
adapter.addFragment(WaterParkFragment.newInstance(),"WaterPark");
adapter.addFragment(DryParkFragment.newInstance(),"DryPark");
adapter.addFragment(FacilitiesFragment.newInstance(),"Facilities");
viewPager.setAdapter(adapter);
}
}
DryParkFragment (Same with WaterParkFragment & FacilitiesFragment):
package com.ardityo.android.transeraapps.ui.home.tabs.drypark;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import com.ardityo.android.transeraapps.R;
import com.ardityo.android.transeraapps.ui.settings.SettingsViewModel;
public class DryParkFragment extends Fragment {
public DryParkFragment() {
// Required empty public constructor
}
public static DryParkFragment newInstance() {
Bundle args = new Bundle();
DryParkFragment fragment = new DryParkFragment();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.content_home_2, container, false);
}
// #Override
// public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// inflater.inflate(R.menu.menu_calls_fragment, menu);
// super.onCreateOptionsMenu(menu, inflater);
// }
}
content_home_2.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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".ui.home.tabs.drypark.DryParkFragment"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/mascot_head" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test" />
</LinearLayout>

The problem comes from using ViewPager inside NestedScrollView . This may also happen when you use CoordinatorLayout . You have two options to achieve that .
1 . ViewPager2 :
The first option is to use ViewPager2 . Just take a look :
https://developer.android.com/jetpack/androidx/releases/viewpager2
2 . Use custom ViewPager :
Here is a class for you that can determine its height based on childs.
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import androidx.viewpager.widget.ViewPager;
public class CustomViewPager extends ViewPager {
public CustomViewPager(Context context) {
super(context);
}
public CustomViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int biggestHeightMeasureSpec = 0;
for(int i = 0 ; i < getChildCount() ; i++)
{
View child = getChildAt(i);
if (child != null) {
child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
int h = child.getMeasuredHeight();
heightMeasureSpec = MeasureSpec.makeMeasureSpec(h, MeasureSpec.EXACTLY);
if(heightMeasureSpec > biggestHeightMeasureSpec)
biggestHeightMeasureSpec = heightMeasureSpec;
}
}
super.onMeasure(widthMeasureSpec, biggestHeightMeasureSpec);
}
}
Finally just use it in your XML layout :
<PATH.TO.YOUR.CustomViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

Try using viewpager 2, dont forget to use newest library
-> https://developer.android.com/jetpack/androidx/releases/viewpager2?hl=id

Fragment A Notify Fragment B

I have a function1 in FragA, and a function2 in FragB
What I want is : when FragA use function1, it should notify FragB to use functionB
So what is the easiest and good way to do it ?
Thanks

1. Using an EventBus
Use an EventBus to send event to the other fragment. You can try Otto or EventBus
2. Using FragmentManager and public method (I don't like these)
As #Alexander suggested, you can get reference to the other fragment and call its method
3. Using Broadcasts
You can use a LocalBroadcast and attach a receiver in both fragments to call the method when they receive a broadcast.

following is the example for your question, well it's quite crude in code but will give you an idea about how you can implement your requirement.
your activity should look like this FragmentTestOneActivity.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import test.spinner.one.FragmentA;
import test.spinner.one.FragmentB;
public class FragmentTestOneActivity extends AppCompatActivity implements FragmentA.MyEventMaker{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment_test_one);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
#Override
public void sendData(String text) {
Log.d("FragmentTestOneActivity", "Text: "+text);
FragmentB.setData(text);
}
}
and below is the layout for the above activity activity_fragment_test_one.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"
android:background="#cf5f5b"
android:orientation="horizontal"
android:padding="10dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="some.fragment.one.FragmentTestOneActivity"
tools:showIn="#layout/activity_fragment_test_one">
<fragment
android:id="#+id/fragment_one"
android:name="test.spinner.one.FragmentA"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_margin="4dp"
android:layout_weight="0.5"
tools:layout="#layout/fragment_" />
<fragment
android:id="#+id/fragment_two"
android:name="test.spinner.one.FragmentB"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_margin="4dp"
android:layout_weight="0.5"
tools:layout="#layout/fragment_b" />
</LinearLayout>
FragmentA.java
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
/**
* A simple {#link Fragment} subclass.
*/
public class FragmentA extends Fragment {
private MyEventMaker myEventMaker;
private Button button;
public FragmentA() {
// Required empty public constructor
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
myEventMaker = (MyEventMaker)context;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_, container, false);
button = (Button) view.findViewById(R.id.FragmentA_button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
myEventMaker.sendData("something");
}
});
return view;
}
public interface MyEventMaker{
void sendData(String text);
}
}
fragment_a.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"
android:gravity="center"
android:background="#b1a2f3"
tools:context="test.spinner.one.FragmentA">
<Button
android:id="#+id/FragmentA_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button" />
</LinearLayout>
FragmentB
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
/**
* A simple {#link Fragment} subclass.
*/
public class FragmentB extends Fragment {
private static TextView textView;
public FragmentB() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view =inflater.inflate(R.layout.fragment_b, container, false);
textView = (TextView)view.findViewById(R.id.FragmentB_textView);
return view;
}
public static void setData(String text){
Log.d("FragmentB","Text: "+ text);
textView.setText(""+text);
}
}
fragment_b.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"
android:background="#efabca"
android:gravity="center"
tools:context="test.spinner.one.FragmentB">
<TextView
android:id="#+id/FragmentB_textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="" />
</LinearLayout>

From func1 find your B fragment using FragmentManager.findFragmentByTag (or byId) then call your function on that fragment.
Or you can use a 3rd party even bus such as Otto

fragment stuck - can't go to previous fragment

I have a fragment(A) , where another fragment(B) is being opened . When I press back button it just refreshes the fragment(B) instead of exiting from it and returning to fragment A.
I tried poping back the fragment A in the Activity's onBackPressed callback method but it didn't change a thing :
#Override
public void onBackPressed() {
if(B.active)
{
mFragmentManager.popBackStack( A.TAG , 0);
B.active = false;
}
}
** the active boolean is just something I added as part of the solution. It's initialized to TRUE once the fragment is instantiated.

I don't know how to commit a project!
package com.example.a;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import butterknife.ButterKnife;
import butterknife.InjectView;
/**
* Created by 77930 on 2015/11/9.
*/
public class ActivityA extends AppCompatActivity{
#InjectView(R.id.c)
LinearLayout c;
#InjectView(R.id.btn)
TextView btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.c);
ButterKnife.inject(ActivityA.this);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.e, FragA.newInstance(), "A");
// fragmentTransaction.addToBackStack("A");
fragmentTransaction.commitAllowingStateLoss();
}
});
}
}
package com.example.a;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import butterknife.ButterKnife;
import butterknife.InjectView;
/**
* Created by 77930 on 2015/11/10.
*/
public class FragA extends Fragment{
private View rootView;
public static FragA newInstance() {
return new FragA();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public FragA() {
}
#InjectView(R.id.a)
LinearLayout a;
#InjectView(R.id.btn)
TextView btn;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fraga,container,false);
ButterKnife.inject(this,rootView);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.e, FragB.newInstance(), "B");
fragmentTransaction.addToBackStack("B");
fragmentTransaction.commitAllowingStateLoss();
}
});
return rootView;
}
}
package com.example.a;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import butterknife.ButterKnife;
import butterknife.InjectView;
/**
* Created by 77930 on 2015/11/10.
*/
public class FragB extends Fragment{
private View rootView;
public static FragB newInstance() {
return new FragB();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public FragB() {
}
#InjectView(R.id.b)
LinearLayout b;
#InjectView(R.id.btn)
TextView btn;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragb,container,false);
ButterKnife.inject(this, rootView);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getActivity().getSupportFragmentManager().popBackStackImmediate();
}
});
return rootView;
}
}
<?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:id="#+id/c"
android:background="#4b14b1"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/e"
android:layout_width="match_parent"
android:layout_height="300dp">
</FrameLayout>
<TextView
android:id="#+id/btn"
android:textColor="#ffffff"
android:textSize="100dp"
android:gravity="center"
android:text="c"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<?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:id="#+id/a"
android:background="#4b14b1"
android:layout_height="match_parent">
<TextView
android:id="#+id/btn"
android:textColor="#ffffff"
android:textSize="100dp"
android:gravity="center"
android:text="A"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<?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:id="#+id/b"
android:background="#4b14b1"
android:layout_height="match_parent">
<TextView
android:id="#+id/btn"
android:textColor="#ffffff"
android:textSize="100dp"
android:gravity="center"
android:text="B"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>

Locate fragment (android)

I have created ViewPager and tabs. But unfortunately the fragments have added not below the titel of the tabs. I want that the fragment (LoginFragment and ProfleFragment) were located below titles of tabs (Login). How can I do it? Now they look this way (disgusting view):
It's not possible to see textview "username" and texfield for username
How can I cange xml laoyout or add code to locate them correctly?
Here is my code:
profilefragment.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView
android:contentDescription="#string/photoDesc_en"
android:id="#+id/photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="#+id/userInfo"
android:src="#drawable/standarduserphoto" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="#+id/userInfo"
android:layout_alignParentRight="true"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/username_en"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/userNameTextView"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/email_en"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/emailTextView"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/birthdate_en"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/birthDateTextView"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/gender_en"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/genderTextView"
/>
</LinearLayout>
</RelativeLayout>
activity_fullscreen.xml
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
loginfragment.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="wrap_content"
>
<!-- Log In Label -->
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#372c24"
android:text="#string/login_en"/>
<EditText
android:id="#+id/logInTextField"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="text"
android:singleLine="true"
/>
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#372c24"
android:text="#string/password_en"/>
<EditText android:layout_width="fill_parent"
android:id="#+id/passwordTextField"
android:layout_height="wrap_content"
android:singleLine="true"
android:inputType="textPassword"
/>
<!-- Login button -->
<Button android:id="#+id/btnLogin"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/login_en"/>
</LinearLayout>
ProfileFragment.java
package com.example.vklogin;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class ProfileFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.profilefragment, container, false);
return rootView;
}
}
MainActivity.java
package com.example.vklogin;
import com.example.adapter.TabsPagerAdapter;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends FragmentActivity implements TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
private Button logIn,logOut;
private EditText passwordField,userNameField;
// Tab titles
private String[] tabs;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fullscreen);
//LinearLayout userInfoLayout = (LinearLayout) View.inflate(this, R.layout.loginfragment, null);
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
tabs = getResources().getStringArray(R.array.tabViews_en);
// Adding Tabs
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on swiping the viewpager make respective tab selected
* */
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
actionBar.setSelectedNavigationItem(position);
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// on tab selected
// show respected fragment view
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
///
private OnClickListener authorizeClick=new OnClickListener(){
#Override
public void onClick(View v) {
//startLoginActivity();
}
};
private void startLoginActivity() {
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
}
private void setupUI() {
logIn=(Button)findViewById(R.id.btnLogin);
logIn.setOnClickListener(authorizeClick);
passwordField=(EditText)findViewById(R.id.passwordTextField);
userNameField=(EditText)findViewById(R.id.logInTextField);
}
}
LogInFragment.java
package com.example.vklogin;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class LogInFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.loginfragment, container, false);
return rootView;
}
}
TabsPagerAdapter.java
package com.example.adapter;
import com.example.vklogin.LogInFragment;
import com.example.vklogin.ProfileFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
// Top Rated fragment activity
return new LogInFragment();
case 1:
// Games fragment activity
return new ProfileFragment();
}
return null;
}
#Override
public int getCount() {
// get item count - equal to number of tabs
return 2;
}
}
AndroidMafiest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.vklogin"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.vklogin.MainActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/app_name"
android:theme="#style/FullscreenTheme" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Try removing the activoty's theme from the manifest and see if it works.

Why does this only work inside a host class that extends FragmentActivity?

I have a fragment with the following layout: my_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="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/appName"
android:id="#+id/textView" android:layout_gravity="center"
android:layout_margin="5dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button1"
android:id="#+id/button1"
android:layout_gravity="center"/>
and corresponding MyFragment.java
package com.example.appdemo;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
public class MyFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.top_bar, container, false);
Button button1 = (Button)view.findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(getActivity(), "Button Pressed", Toast.LENGTH_SHORT).show();
}
});
return view;
}
}
and this is hosted inside MainActivity.java
package com.example.appdemo;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
public class MainActivity extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
with the following layout 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"
tools:context=".MainActivity" >
<fragment
android:id="#+id/fragment"
android:name="com.example.appdemo.MyFragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
Now, my question is why does this only work when I extend FragmentActivity? I'd like to extend Activity. How do I accomplish that?

Why does this only work inside a host class that extends FragmentActivity?
Because you are inheriting from android.support.v4.app.Fragment instead of android.app.Fragment.