Develop Reference

Android Fragments not showing up Text view and internal elements

I am new to android.I created a tablayout and a viewpager with two fragments.I have elements/items in my created Detail Fragment and a TextView in my measure fragment but when i run the code on my mobile,nothing is shown in my fragment.I haven't java code of my fragment.Everything works fine on the tablayout..i can switch between the tab but nothing is being shown in my fragments...why is that happening?
My Activity:
<?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.update">
<android.support.design.widget.AppBarLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
>
<!--<include android:layout_height="wrap_content"
android:layout_width="match_parent"
layout="#layout/toolbar_layout"/>-->
<include
android:id="#+id/update_screen_toolbar"
layout="#layout/toolbar_layout"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:id="#+id/name_age_gender"
android:background="#d3d3d3"
android:layout_below="#+id/update_screen_toolbar"/>
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tabLayout"
app:tabMode="fixed"
app:tabGravity="fill">
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/viewPager">
</android.support.v4.view.ViewPager>
</RelativeLayout>
JAVA code for activity
package com.example.update;
import android.content.Intent;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
public class UpdateDetail extends AppCompatActivity {
TabLayout tabLayout;
ViewPager viewPager;
ViewPagerAdapter viewPagerAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
tabLayout=(TabLayout)findViewById(R.id.tabLayout);
viewPager=(ViewPager)findViewById(R.id.viewPager);
viewPagerAdapter=new ViewPagerAdapter(getSupportFragmentManager());
viewPagerAdapter.addFragments(new DetailFragment()," DETAIL");
viewPagerAdapter.addFragments(new MeasureFragment(),"MEASURE");
viewPager.setAdapter(viewPagerAdapter);
tabLayout.setupWithViewPager(viewPager);
}
}
code for DetailFragment:
<FrameLayout 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.DetailFragment">
<!-- TODO: Update blank fragment layout -->
<Button
android:id="#+id/expandableButton4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#066da1"
android:drawableRight="#android:drawable/arrow_down_float"
android:onClick="expandableButton4"
android:paddingRight="10dp"
android:text="Expand/Collapse Android Example"
android:textColor="#fff" />
<com.github.aakira.expandablelayout.ExpandableRelativeLayout
android:id="#+id/expandableLayout4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/expandableButton4"
android:background="#90066da1"
android:padding="16dp"
app:ael_duration="400"
app:ael_expanded="false"
app:ael_interpolator="bounce"
app:ael_orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Implements the expand and collapse by sliding logic for a top or a bottom view in a two children view or layout or any widgets composition.
Implements the expand and collapse by sliding logic for a top or a bottom view in a two children view or layout or any widgets composition." />
</com.github.aakira.expandablelayout.ExpandableRelativeLayout>
</FrameLayout>

Try this one:
public class FriendshipParentFragment extends Fragment {
#BindView(R.id.tabs)
TabLayout tabs;
#BindView(R.id.viewpager)
ViewPager viewPager;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_friendship_parent, container, false);
ButterKnife.bind(this, view);
initTabs();
return view;
}
private void initTabs(){
viewPager.setAdapter(new TabsAdapter(getChildFragmentManager()));
tabs.setupWithViewPager(viewPager);
tabs.getTabAt(0).setText("Tab1");
tabs.getTabAt(1).setText("Tab2");
tabs.setTabTextColors(ContextCompat.getColor(getActivity(), R.color.colorAccent), ContextCompat.getColor(getActivity(), R.color.colorBottomNavigationPrimary));
tabs.setSelectedTabIndicatorColor(ContextCompat.getColor(getActivity(), R.color.white));
tabs.setSelectedTabIndicatorHeight(4);
}
public class TabsAdapter extends FragmentPagerAdapter {
public TabsAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
return new FollowersFragment();
case 1:
return new FollowFragment();
}
return null;
}
#Override
public int getCount() {
return 2;
}
}
}
xml file
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="owo.owocar.driver.OrdersParentFragment">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="48dp"
android:elevation="4dp"
app:tabGravity="fill" />
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:id="#+id/viewpager"
android:layout_height="match_parent"></android.support.v4.view.ViewPager>

Android OnClick fails every new project

First post. I'm following a few courses on Android programming so fairly new but not a complete newbie. I have a background in programming from long ago..
For some odd reason, older projects have the OnClick running fine but every project I created today, with either Genymotion or AVD the OnClick never fires even in the following barebone example I created.
https://www.dropbox.com/s/js1qh263vldte0z/deleteme.zip?dl=0
Here's the original project I'm working on which I can't even click on the buttons (as if there's a transparency in front or something).
If someone can explain why when I open older projects based on 22 everything works but running now on 23 (with 16 as backward) OnClick doesn't work that'd be very nice of you. Thanks!
The Layout:
<?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="match_parent"
android:orientation="vertical"
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="ca.shaarable.planetxerox.admin_add_products_hardware">
<LinearLayout
android:orientation="vertical"
android:id="#+id/admin_add_printer_first"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.2">
<TextView
android:id="#+id/admin_add_printer_tv_name"
android:text="#string/admin_add_printer_tv_name"
android:textSize="12sp"
android:layout_marginStart="10dp"
android:layout_marginLeft="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<EditText
android:id="#+id/admin_add_printer_et_name"
android:text="#string/admin_add_printer_et_name"
android:layout_marginStart="10dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:id="#+id/admin_add_printer_second"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.65">
<TextView
android:id="#+id/admin_add_printer_tv_thumbnail"
android:text="#string/admin_add_printer_tv_thumbnail"
android:textStyle="italic"
android:layout_marginBottom="5dp"
android:gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<ImageView
android:id="#+id/admin_add_printer_image"
android:src="#drawable/igen5"
android:layout_gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:id="#+id/admin_add_printer_third"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.15">
<LinearLayout
android:id="#+id/admin_add_printer_sublayout"
android:orientation="horizontal"
android:layout_marginTop="20dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_weight="1"
android:layout_marginRight="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/admin_add_printer_CANCEL"
android:text="#string/admin_add_printer_CANCEL"
android:background="#F99F1C"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/admin_add_printer_ADD"
android:text="#string/admin_add_printer_ADD"
android:background="#2ABDBA"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
And here's the code for the class:
package ca.shaarableapps.presssupport;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
public class AdminAddPrinter extends AppCompatActivity implements View.OnClickListener
{
private EditText printerName;
private ImageView printerThumbnail;
private Button cancelBtn, addBtn;
private static final String TAG = "MyActivity";
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_admin_add_printer);
printerName = (EditText)findViewById(R.id.admin_add_printer_et_name);
printerThumbnail = (ImageView)findViewById(R.id.admin_add_printer_image);
cancelBtn = (Button)findViewById(R.id.admin_add_printer_CANCEL);
addBtn = (Button)findViewById(R.id.admin_add_printer_ADD);
}
#Override
public void onClick(View v)
{
Log.v(TAG, "Nooooooooooooo");
switch (v.getId())
{
case R.id.admin_add_printer_ADD:
addBtn.setText("Good Job");
break;
}
}
}
This is the layout as seen by the user...

Try to add .setOnClickListener(this); inside onCreate(...) method.
protected void onCreate(Bundle savedInstanceState){
...
addBtn.setOnClickListener(this);
}
Hope this help

The problem is here in you code.
<Button
android:id="#+id/admin_add_printer_ADD"
android:text="#string/admin_add_printer_ADD"
android:background="#2ABDBA"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="onClick" // add this line
/>

Action bar, navigation drawer with listview

I am novice to android programming and try to implement a listview which gets populated from the database. I want to have an actionbar with navigation drawer in my application. However as mainactivity.java extends listview, it's not possible to extend appcompatibility class.
I am trying to find solution on internet, but unable to find anything concrete. Is there anyway in which we can implement this? If there is any resource please provide that.
below is code of my 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" >
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
I have one more layout file app_custom_list.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="#+id/appIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="3dp"
android:layout_marginTop="3dp"/>
//android:src="#drawable/facebook" />
<TextView
android:id="#+id/titleTxt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#id/appIcon"
android:layout_toRightOf="#id/appIcon"
android:layout_marginLeft="3dp"
android:text="Application Title"
android:textSize="22dp"/>
<TextView
android:id="#+id/dlTxt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/titleTxt"
android:layout_marginLeft="10dp"
android:layout_marginRight="3dp"
android:text="description"
android:textSize="18dp"/>
</RelativeLayout>
My main_activity.java file is below:
package com.example.gurje.beyondteaching1;
import java.util.List;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends ListActivity implements FetchDataListener{
private ProgressDialog dialog;
private String[] mPlanetTitles;
private ListView mDrawerList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
// show progress dialog
dialog = ProgressDialog.show(this, "", "Loading...");
String url = "http://192.168.0.29:8080/connect.php";
FetchDataTask task = new FetchDataTask(this);
task.execute(url);
}
#Override
public void onFetchComplete(List<Application> data) {
// dismiss the progress dialog
if(dialog != null) dialog.dismiss();
// create new adapter
ApplicationAdapter adapter = new ApplicationAdapter(this, data);
// set the adapter to list
setListAdapter(adapter);
}
#Override
public void onFetchFailure(String msg) {
// dismiss the progress dialog
if(dialog != null) dialog.dismiss();
// show failure message
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
}
public void NavigationDrawer(){
}
}
Now i want to add actionbar to it, but as i am already extending listactivity, I cant extend appcompat which is required to implement actionbar

Don't extend ListActivity. You can add list to your xml and get it using findViewById(<id>). See example below.
main_activity.xml:
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_height="wrap_content"
android:layout_width="match_parent">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<ListView
android:id="#+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:id="#+id/navigation_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="#menu/drawer_menu" />
</android.support.v4.widget.DrawerLayout>
MainActivity.java:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.main_activity);
setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
ListView listView = (ListView)findViewById(R.id.listView);
}
}

Get button from a fragment in Android

I was working with and slider tab, insaid the main view I have 2 tabs and insaid them, I have a XML to set the UI. Everything is perfect, I get my slide tabs and I can run the app. The problem is when I try to get a button from my fragments. I was reading about LayoutInflater, but I couldn´t solved.
Please, I think I don´t undestand very well how the fragment works and I would like a little of help about this.
This is my main activity (onCreate):
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
facebookLogin = new FacebookLogin(getApplicationContext());
setContentView(R.layout.register_tabs);
toolBar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolBar);
adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true);
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.colorPrimary);
}
});
tabs.setViewPager(pager);
}
I my 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"
android:orientation="vertical"
tools:context=".MainActivity">
<include
android:id="#+id/toolbar"
layout="#layout/toolbar"
/>
<com.cheescake.clasi.all.SlidingTabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="2dp"/>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_weight="1"
/>
</LinearLayout>
And the XML and class where I have my button:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="6">
<Space
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="3" />
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<Space
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="3" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Inicia sesión para comprar y vender los mejores productos "
android:id="#+id/textView"
android:gravity="center" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="#string/user_name"
android:ems="10"
android:id="#+id/editText"
android:layout_weight="2"
android:gravity="bottom" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:hint="#string/user_pass"
android:ems="10"
android:id="#+id/editText2"
android:layout_weight="2"
android:gravity="bottom" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="10dp"
android:text="¿has olvidado tu contraseña?"
android:textColor="#color/colorPrimaryDark"
android:id="#+id/text_loggin"
android:layout_weight="1.3"
android:layout_marginLeft="5dp"
android:gravity="right" />
<Space
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<com.google.android.gms.common.SignInButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button"
android:layout_weight="1" />
<com.facebook.login.widget.LoginButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/login_button"
android:layout_weight="1" />
<Space
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="3" />
</LinearLayout>
<Space
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="3" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.8"
android:background="#color/bottomBackground">
<Space
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="5" />
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="#string/finish"
android:id="#+id/txtNextButton"
android:layout_weight="1"
android:gravity="center" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>
The class of the fragment:
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 com.facebook.login.widget.LoginButton;
public class RegisterTabLogin extends Fragment {
private LoginButton loginButton;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, #Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.register_tab_login,container,false);
return v;
}
}
As I say, I just want to get a View from the fragment and work with it in the Main Activity, I was reading about LayoutInflater but I could´t solved, Also I read some questions here, (Using button from a fragment in main activity) but I couldn´t solved.
Any help will be gratefull, a link o something.

have you tried this?
public class RegisterTabLogin extends Fragment {
private LoginButton loginButton;
private LoginCallback mCallback;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, #Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.register_tab_login,container,false);
loginButton = (LoginButton) v.findViewById(R.id.login_button);
showData.setOnClickListener(onClickListener);
return v;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallback = (LoginCallback) activity;
} catch (ClassCastException e) {
throw new ClassCastException(
"Activity must implement LoginCallback.");
}
}
private final OnClickListener onClickListener = new OnClickListener() {
#Override
public void onClick(View v) {
if (mCallback != null) {
mCallback.onLogin();
}
}
};
public static interface LoginCallback{
void onLogin();
}
}
then on MainActivity
public class MainActivity extends Activity implements
RegisterTabLogin.LoginCallback {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
facebookLogin = new FacebookLogin(getApplicationContext());
setContentView(R.layout.register_tabs);
toolBar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolBar);
adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true);
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.colorPrimary);
}
});
tabs.setViewPager(pager);
}
#Override
public void onLogin() {
//DO SOMETHING
}
}

In your Main Activity, access this view in the OnStart() method like this:
#Override
protected void onStart() {
Button yourButton = (Button)findViewById(R.id.yourButton);
super.onStart();
}
EDIT:
Your fragment should be present in your Main Activity.
You can add RegisterTabLogin in a certain containerView present in your Main Activity layout in the OnCreate() method like this:
RegisterTabLogin registerTabLogin= new RegisterTabLogin();
getFragmentManager().beginTransaction().add(R.id.a_certain_layout, registerTabLogin).commit();

Android Fragment behaving weird

The activity_main.xml is like this
<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" >
<Button
android:id="#+id/button_one_activity_one"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="First Button"
/>
<fragment
android:name="fragments.FirstFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/first_fragment" />
<Button
android:id="#+id/button_two_activity_one"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Second Button"
/>
</LinearLayout>
The main activity class is like this
package com.example.testfragmentshoneycomb;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
first_fragment.xml is like this
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#color/grey" >"
<TextView
android:id="#+id/text_view_one_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Text View one" />
<TextView
android:id="#+id/text_view_two_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Text View two" />
<TextView
android:id="#+id/text_view_three_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Text View three" />
</LinearLayout>
FirstFragment class is like this
package fragments;
import com.example.testfragmentshoneycomb.R;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FirstFragment 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) {
View view = inflater.inflate(R.layout.first_fragment, container, false);
return view;
}
}
It shows only first button and nothing else on the screen. If I remove the first button from activity_main.xml it shows the fragment but doesn't show the second button.
Min SDK version is 11 and build target is android 4.1

set android:orientation="vertical" in your activity layout.

Its because by default LinearLayout's orientation is horizontal. Therefore the whole screens width is captured by the First Button and Fragment.
Are you sure you want to see it like?
First_Button Fragment Second_Button
If Yes the use layout_weight. If No then give orientation=vertical to LinearLayout which will show your layout output as
First_Button
Fragment
Second_Button

set LinearLayout orientation to vertical, it's horizontal by default.
read docs carefully

Use the following layout :
<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:orientation="vertical" >
<Button
android:id="#+id/button_one_activity_one"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="First Button"
/>
<fragment
android:name="fragments.FirstFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/first_fragment" />
<Button
android:id="#+id/button_two_activity_one"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Second Button"
/>
</LinearLayout>