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Horizontal recyclerview disappeares if I visit other tabs

In my android project, there are three tabs in the main page. I placed the horizontal recyclerview in the third tab. it works fine for the first time, but when I visit first tab and come back, the horizontal recyclerview gets disappeared. Someone please help me
codes are given below.
Tab3.xml
<?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="match_parent"
android:orientation="vertical"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<TextView
android:id="#+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Suggestions" />
<FrameLayout
android:id="#+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="180dp"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
</LinearLayout>
</LinearLayout>
recycler_items.xml
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:layout_margin="5dp"
card_view:cardCornerRadius="4dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="#dimen/card_height"
android:orientation="vertical"
android:weightSum="4"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="3.2"
android:orientation="vertical">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal">
<ImageView
android:id="#+id/coverImageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:scaleType="centerCrop"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="left|bottom"
android:background="#android:drawable/screen_background_dark_transparent"
android:orientation="vertical">
<TextView
android:id="#+id/titleTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="16dp"
android:textSize="#dimen/text_size"
android:textColor="#FFFFFF"
android:textStyle="bold"/>
</LinearLayout>
</FrameLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="0.8"
android:gravity="center|right"
android:orientation="horizontal">
<ImageView
android:id="#+id/likeImageView"
android:layout_width="#dimen/icon_width"
android:layout_height="#dimen/icon_height"
android:padding="#dimen/icon_padding"
android:src="#drawable/ic_like" />
<ImageView
android:id="#+id/shareImageView"
android:layout_width="#dimen/icon_width"
android:layout_height="#dimen/icon_height"
android:padding="#dimen/icon_padding"
android:src="#drawable/ic_share" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
fragment_horizontal_list_view.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_left_margin"
android:paddingRight="#dimen/activity_right_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/cardView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
Tab3.java
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Arshad on 09-06-2017.
*/
public class Tab3 extends Fragment {
ListView listView;
listItemAdapterPop listItemAdapter_Pop;
String[] names = {"Hrithik","Ranbir","AkshayKumar","Amir Khan","Shahidi Kapoor"};
String[] type = {"Bollywood actor","Mollywood Actor","Dancer","Playback Singer","DJ"};
int[] images = {R.drawable.index1,R.drawable.index2,R.drawable.index3,R.drawable.index4,R.drawable.index5};
private List<Artists> artistList = new ArrayList<>();
private RecyclerView recyclerView;
private ArtistAdapter mAdapter;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.tab3,container,false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// listView = (ListView)view.findViewById(R.id.listView_pop);
// listItemAdapter_Pop = new listItemAdapterPop(getActivity(),names,images,type);
// listView.setAdapter(listItemAdapter_Pop);
//listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
// #Override
//public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
// Toast.makeText(getActivity(), "you can view the profile of :"+names[i], Toast.LENGTH_SHORT).show();
// }
//});
FragmentManager fm = getFragmentManager();
Fragment fragment = fm.findFragmentById(R.id.fragmentContainer);
if (fragment == null) {
fragment = new HorizontalListViewFragment();
;
fm.beginTransaction()
.add(R.id.fragmentContainer, fragment)
.commit();
}
recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
mAdapter = new ArtistAdapter(artistList);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), LinearLayoutManager.VERTICAL));
// set the adapter
recyclerView.setAdapter(mAdapter);
prepareArtistData();
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new RecyclerTouchListener.ClickListener() {
#Override
public void onClick(View view, int position) {
Artists artist = artistList.get(position);
Toast.makeText(getActivity(), artist.getArtistName() + " is selected!", Toast.LENGTH_SHORT).show();
}
#Override
public void onLongClick(View view, int position) {
Artists artist = artistList.get(position);
Toast.makeText(getActivity(), artist.getArtistName() + " is long pressed selected!", Toast.LENGTH_SHORT).show();
}
}));
}
public void prepareArtistData(){
for(int i=0;i<names.length;i++){
Artists artist = new Artists(names[i], type[i], images[i]);
artistList.add(artist);
}
mAdapter.notifyDataSetChanged();
}
}
HorizontalListViewFragment.java
package com.example.majedhussain.loginsample;
/**
* Created by anonymous on 11/4/16.
*/
import android.content.ContentResolver;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class HorizontalListViewFragment extends Fragment {
ArrayList<Artists> listitems = new ArrayList<>();
RecyclerView MyRecyclerView;
String ArtistsS[] = {"Hrithik","Ranbir","AkshayKumar","Amir Khan","Shahidi Kapoor"};
int Images[] = {R.drawable.index1,R.drawable.index2,R.drawable.index3,R.drawable.index4,R.drawable.index5};
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
listitems.clear();
for(int i =0;i<ArtistsS.length;i++){
Artists item = new Artists();
item.setArtistName(ArtistsS[i]);
item.setImageResourceId(Images[i]);
item.setIsfav(0);
item.setIsturned(0);
listitems.add(item);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_horizontal_list_view, container, false);
MyRecyclerView = (RecyclerView) view.findViewById(R.id.cardView);
MyRecyclerView.setHasFixedSize(true);
LinearLayoutManager MyLayoutManager = new LinearLayoutManager(getActivity());
MyLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
if (listitems.size() > 0 & MyRecyclerView != null) {
MyRecyclerView.setAdapter(new MyAdapter(listitems));
}
MyRecyclerView.setLayoutManager(MyLayoutManager);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {
private ArrayList<Artists> list;
public MyAdapter(ArrayList<Artists> Data) {
list = Data;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// create a new view
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.recycle_items, parent, false);
MyViewHolder holder = new MyViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
holder.titleTextView.setText(list.get(position).getArtistName());
holder.coverImageView.setImageResource(list.get(position).getImageResourceId());
holder.coverImageView.setTag(list.get(position).getImageResourceId());
holder.likeImageView.setTag(R.drawable.ic_like);
}
#Override
public int getItemCount() {
return list.size();
}
}
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView titleTextView;
public ImageView coverImageView;
public ImageView likeImageView;
public ImageView shareImageView;
public MyViewHolder(View v) {
super(v);
titleTextView = (TextView) v.findViewById(R.id.titleTextView);
coverImageView = (ImageView) v.findViewById(R.id.coverImageView);
likeImageView = (ImageView) v.findViewById(R.id.likeImageView);
shareImageView = (ImageView) v.findViewById(R.id.shareImageView);
likeImageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int id = (int)likeImageView.getTag();
if( id == R.drawable.ic_like){
likeImageView.setTag(R.drawable.ic_liked);
likeImageView.setImageResource(R.drawable.ic_liked);
Toast.makeText(getActivity(),titleTextView.getText()+" added to favourites", Toast.LENGTH_SHORT).show();
}else{
likeImageView.setTag(R.drawable.ic_like);
likeImageView.setImageResource(R.drawable.ic_like);
Toast.makeText(getActivity(),titleTextView.getText()+" removed from favourites", Toast.LENGTH_SHORT).show();
}
}
});
shareImageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Uri imageUri = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE +
"://" + getResources().getResourcePackageName(coverImageView.getId())
+ '/' + "drawable" + '/' + getResources().getResourceEntryName((int)coverImageView.getTag()));
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.putExtra(Intent.EXTRA_STREAM,imageUri);
shareIntent.setType("image/jpeg");
startActivity(Intent.createChooser(shareIntent, getResources().getText(R.string.send_to)));
}
});
}
}
}
Artists.java
package com.example.majedhussain.loginsample;
/**
* Created by MAJED HUSSAIN on 14-06-2017.
*/
public class Artists {
String artistName;
String desc;
int imageResourceId;
int isfav;
int isturned;
public Artists(String artistName, String desc, int imageResourceId) {
this.artistName = artistName;
this.desc = desc;
this.imageResourceId = imageResourceId;
}
public Artists() {
}
public void setDesc(String desc){
this.desc = desc;
}
public String getDesc() {
return desc;
}
public int getIsturned() {
return isturned;
}
public void setIsturned(int isturned) {
this.isturned = isturned;
}
public int getIsfav() {
return isfav;
}
public void setIsfav(int isfav) {
this.isfav = isfav;
}
public String getArtistName() {
return artistName;
}
public void setArtistName(String artistName) {
this.artistName = artistName;
}
public int getImageResourceId() {
return imageResourceId;
}
public void setImageResourceId(int imageResourceId) {
this.imageResourceId = imageResourceId;
}
}
MainActivity.java
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,TabLayout.OnTabSelectedListener {
private TabLayout tabLayout;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
tabLayout = (TabLayout) findViewById(R.id.tabLayout);
//Adding the tabs using addTab() method
tabLayout.addTab(tabLayout.newTab().setText("Home"));
tabLayout.addTab(tabLayout.newTab().setText("Favourites"));
tabLayout.addTab(tabLayout.newTab().setText("Trending"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
//Initializing viewPager
viewPager = (ViewPager) findViewById(R.id.pager);
//Creating our pager adapter
Pager adapter = new Pager(getSupportFragmentManager(), tabLayout.getTabCount());
//Adding adapter to pager
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
//Adding onTabSelectedListener to swipe views
tabLayout.setOnTabSelectedListener(this);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
}
output images are:
This is the first output in which horizontal list is visible
This is the second output after I visited first tab and came back. now horizontal list is disappeared

I think your fragment is not null:
Fragment fragment = fm.findFragmentById(R.id.fragmentContainer);
if (fragment == null) {
fragment = new HorizontalListViewFragment();
;
fm.beginTransaction()
.add(R.id.fragmentContainer, fragment)
.commit();
}

how can i add an image header to my navigation drawer layout

how can i add an image header to my navigation drawer layout like this one. the problem i now have is that every listitem has it's own icon but the header image is also printed on every item.
this is what i want
What i now have is this:
this is what i have now
mainactivity.java
main activity.java
package be.yvandamme.ginlovers.activity;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import com.google.android.gms.analytics.GoogleAnalytics;
import be.yvandamme.ginlovers.R;
import be.yvandamme.ginlovers.WebViewAppApplication;
import be.yvandamme.ginlovers.adapter.DrawerAdapter;
import be.yvandamme.ginlovers.fragment.MainFragment;
public class MainActivity extends ActionBarActivity
{
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mDrawerToggle;
private ListView mDrawerListView;
private CharSequence mTitle;
private CharSequence mDrawerTitle;
private String[] mTitles;
public static Intent newIntent(Context context)
{
Intent intent = new Intent(context, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
return intent;
}
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupActionBar();
setupDrawer(savedInstanceState);
// init analytics tracker
((WebViewAppApplication) getApplication()).getTracker();
}
#Override
public void onStart()
{
super.onStart();
// analytics
GoogleAnalytics.getInstance(this).reportActivityStart(this);
}
#Override
public void onResume()
{
super.onResume();
}
#Override
public void onPause()
{
super.onPause();
}
#Override
public void onStop()
{
super.onStop();
// analytics
GoogleAnalytics.getInstance(this).reportActivityStop(this);
}
#Override
public void onDestroy()
{
super.onDestroy();
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
// action bar menu
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
// open or close the drawer if home button is pressed
if(mDrawerToggle.onOptionsItemSelected(item))
{
return true;
}
// action bar menu behaviour
switch(item.getItemId())
{
case android.R.id.home:
Intent intent = MainActivity.newIntent(this);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#Override
protected void onPostCreate(Bundle savedInstanceState)
{
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfiguration)
{
super.onConfigurationChanged(newConfiguration);
mDrawerToggle.onConfigurationChanged(newConfiguration);
}
#Override
public void setTitle(CharSequence title)
{
mTitle = title;
getSupportActionBar().setTitle(mTitle);
}
private void setupActionBar()
{
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ActionBar bar = getSupportActionBar();
bar.setDisplayUseLogoEnabled(false);
bar.setDisplayShowTitleEnabled(true);
bar.setDisplayShowHomeEnabled(true);
bar.setDisplayHomeAsUpEnabled(true);
bar.setHomeButtonEnabled(true);
}
private void setupDrawer(Bundle savedInstanceState)
{
mTitle = getTitle();
mDrawerTitle = getTitle();
// title list
mTitles = getResources().getStringArray(R.array.navigation_title_list);
// icon list
TypedArray iconTypedArray = getResources().obtainTypedArray(R.array.navigation_icon_list);
Integer[] icons = new Integer[iconTypedArray.length()];
for(int i=0; i<iconTypedArray.length(); i++)
{
icons[i] = iconTypedArray.getResourceId(i, -1);
}
iconTypedArray.recycle();
// reference
mDrawerLayout = (DrawerLayout) findViewById(R.id.activity_main_layout);
mDrawerListView = (ListView) findViewById(R.id.activity_main_drawer);
// set drawer
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
mDrawerListView.setAdapter(new DrawerAdapter(this, mTitles, icons));
mDrawerListView.setOnItemClickListener(new OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> adapterView, View clickedView, int position, long id)
{
selectDrawerItem(position, false);
}
});
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_open, R.string.drawer_close)
{
#Override
public void onDrawerClosed(View view)
{
getSupportActionBar().setTitle(mTitle);
supportInvalidateOptionsMenu();
}
#Override
public void onDrawerOpened(View drawerView)
{
getSupportActionBar().setTitle(mDrawerTitle);
supportInvalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
// show initial fragment
if(savedInstanceState == null)
{
selectDrawerItem(0, true);
}
}
private void selectDrawerItem(int position, boolean init)
{
String[] urlList = getResources().getStringArray(R.array.navigation_url_list);
String[] shareList = getResources().getStringArray(R.array.navigation_share_list);
Fragment fragment = MainFragment.newInstance(urlList[position], shareList[position]);
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.activity_main_container, fragment).commitAllowingStateLoss();
mDrawerListView.setItemChecked(position, true);
if(!init) setTitle(mTitles[position]);
mDrawerLayout.closeDrawer(mDrawerListView);
}
}
drawer adapter.java
package be.yvandamme.ginlovers.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import be.yvandamme.ginlovers.R;
public class DrawerAdapter extends BaseAdapter
{
private Context mContext;
private String[] mTitleList;
private Integer[] mIconList;
public DrawerAdapter(Context context, String[] titleList, Integer[] iconList)
{
mContext = context;
mTitleList = titleList;
mIconList = iconList;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent)
{
// inflate view
View view = convertView;
if(view == null)
{
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.drawer_item, parent, false);
// view holder
ViewHolder holder = new ViewHolder();
holder.titleTextView = (TextView) view.findViewById(R.id.drawer_item_title);
holder.iconImageView = (ImageView) view.findViewById(R.id.drawer_item_icon);
view.setTag(holder);
}
// entity
String title = mTitleList[position];
Integer icon = mIconList[position];
if(title!=null && icon!=null )
{
// view holder
ViewHolder holder = (ViewHolder) view.getTag();
// content
holder.titleTextView.setText(title);
holder.iconImageView.setImageResource(icon);
}
return view;
}
#Override
public int getCount()
{
if(mTitleList!=null) return mTitleList.length;
else return 0;
}
#Override
public Object getItem(int position)
{
if(mTitleList!=null) return mTitleList[position];
else return null;
}
#Override
public long getItemId(int position)
{
return position;
}
public void refill(Context context, String[] titleList, Integer[] iconList)
{
mContext = context;
mTitleList = titleList;
mIconList = iconList;
notifyDataSetChanged();
}
static class ViewHolder
{
TextView titleTextView;
ImageView iconImageView;
}
}
this is my activity_main.xml
<?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="match_parent"
android:orientation="vertical">
<include layout="#layout/toolbar" />
<android.support.v4.widget.DrawerLayout
android:id="#+id/activity_main_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/activity_main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
<ListView
android:id="#+id/activity_main_drawer"
android:layout_width="#dimen/drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:drawSelectorOnTop="true"
android:fastScrollEnabled="false"
android:listSelector="#drawable/selector_clickable_item_bg"
android:background="#color/global_bg_front"
/>
</android.support.v4.widget.DrawerLayout>
</LinearLayout>
and this my drawer_item.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="wrap_content"
android:minHeight="#dimen/global_spacing_l"
android:gravity="center_vertical"
android:orientation="horizontal"
android:background="?attr/drawerItemBackground">
<ImageView
android:id="#+id/drawer_image"
android:layout_width="280dp"
android:layout_height="140dp"
android:src="#drawable/loading" />
<ImageView
android:id="#+id/drawer_item_icon"
android:layout_width="#dimen/global_spacing_m"
android:layout_height="#dimen/global_spacing_m"
android:layout_marginLeft="#dimen/global_keyline_s"
android:layout_marginRight="#dimen/global_spacing_xs"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
android:layout_below="#+id/drawer_image"/>
<TextView
android:id="#+id/drawer_item_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="#dimen/global_keyline_s"
android:textAppearance="#style/TextAppearance.WebViewApp.Body1"
android:layout_below="#+id/drawer_image"/>
</RelativeLayout>

Try by add header view to your listview (header will also scroll in this case), You need to do like this in your MainActivity :
View header = (View) getLayoutInflater().inflate(
R.layout.header_layout, null);
ImageView img=(ImageView)header.findViewById(R.id.imgView);
img.setBackgroundResource(R.drawable.icon);
mainListView.addHeaderView(header);
Or you can use DesignLibrary like here or here.

Add another view in your XML and position it above activity_main_drawer inside your DrawerLayout. The header is probably not supposed to scroll so it shouldn't be in your listview. Also, remove drawer_image from the listview item layout. Since it's not supposed to be in all the items.
<?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="match_parent"
android:orientation="vertical">
<include layout="#layout/toolbar" />
<android.support.v4.widget.DrawerLayout
android:id="#+id/activity_main_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/activity_main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
<LinearLayout
android:layout_width="#dimen/drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
android:orientation="vertical">
<ImageView
android:id="#+id/drawer_image"
android:layout_width="280dp"
android:layout_height="140dp"
android:src="#drawable/loading" />
<ListView
android:id="#+id/activity_main_drawer"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:choiceMode="singleChoice"
android:drawSelectorOnTop="true"
android:fastScrollEnabled="false"
android:listSelector="#drawable/selector_clickable_item_bg"
android:background="#color/global_bg_front"
/>
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
</LinearLayout>
Or use http://developer.android.com/reference/android/support/design/widget/NavigationView.html and add your image as header view.
navView = (NavigationView) findViewById(R.id.navView);
navView.inflateHeaderView(R.layout.myheader)
or in XML
app:headerLayout="#layout/myheader"

What is best example for Navigation Drawer in Material Design in low API

I trying find more info how create best Navigation Drawer panel with Material Desing's guidelines.
Google recommended page Creating a Navigation Drawer. This example based on Support Library v4.
Also link about v7 AppCompat v21 — Material Design for Pre-Lollipop Devices!. This work fine only on Android API 21+. I can't use this Material Desing in lower OS's vesion, because If I set target=android-20 (or less) in project.properties I get errors in Eclipse (several hundred):
C:\<workspace>\android-support-v7-appcompat\res\values-v21\styles_base.xml:75: error: Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.ActionButton'
....
:( several hundred error in 'values-v21' directory
....
I use features of low Android API, that was deprecated or undefined in Android API 21+. But I need support Material Design in low API (14+).
Please give examples of creating Navigation Drawer on low Android API 14+.

Use this as a dependency :
compile "com.android.support:appcompat-v7:21.0.2" (or use newer)
Layout :
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<include layout="#layout/toolbar"
android:id="#+id/mytoolbardrawer"
/>
<FrameLayout
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_below="#id/mytoolbardrawer"
android:layout_height="match_parent"
/>
</RelativeLayout>
<RelativeLayout
android:id="#+id/rel_drawer"
android:layout_width="304dp"
android:layout_height="match_parent"
android:layout_gravity="start"
>
<ImageView
android:layout_width="match_parent"
android:layout_height="171dp"
android:id="#+id/img_drawer"
android:scaleType="centerCrop"
android:src="#drawable/photo_4"/>
<ListView
android:id="#+id/list_slidermenu"
android:layout_below="#id/img_drawer"
android:layout_width="304dp"
android:listSelector="#drawable/list_selector"
android:checkable="true"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:paddingStart="16dp"
android:paddingEnd="16dp"
android:dividerHeight="1dp"
android:theme="#style/ThemeOverlay.AppCompat.Light"
android:background="#android:color/white" />
</RelativeLayout>
</android.support.v4.widget.DrawerLayout>
Drawer Activity :
import android.content.res.Configuration;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.Toolbar;
import android.text.Html;
import android.text.SpannableString;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
public class DrawerActivity extends ActionBarActivity {
Toolbar t;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private RelativeLayout mRelativeLayout;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle,mTitle;
private String[] navMenuItems;
private SpannableString[] navmenuItems;
private ArrayAdapter<SpannableString> adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawer);
t=(Toolbar)findViewById(R.id.mytoolbardrawer);
setSupportActionBar(t);
initStuffs();
if (savedInstanceState == null) {
new SliderMenuClickListener().displayView(0);
}
}
private void initStuffs() {
mTitle=mDrawerTitle=getTitle();
navMenuItems=getResources().getStringArray(R.array.Titles);
mDrawerLayout=(DrawerLayout)findViewById(R.id.drawer_layout);
mDrawerList=(ListView)findViewById(R.id.list_slidermenu);
mRelativeLayout=(RelativeLayout)findViewById(R.id.rel_drawer);
navmenuItems=new SpannableString[navMenuItems.length];
for(int i=0;i<navMenuItems.length;i++) {
navmenuItems[i] = new SpannableString(Html.fromHtml("<font color='#000000'>" + navMenuItems[i] + "</font>"));
}
adapter=new ArrayAdapter<SpannableString>(DrawerActivity.this,android.R.layout.simple_list_item_1,navmenuItems);
mDrawerList.setAdapter(adapter);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerToggle=new ActionBarDrawerToggle(DrawerActivity.this,mDrawerLayout,t,R.string.app_name,R.string.app_name){
public void onDrawerClosed(View view){
getSupportActionBar().setTitle(mTitle);
invalidateOptionsMenu();
}
public void onDrawerOpened(View view){
getSupportActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerList.setOnItemClickListener(new SliderMenuClickListener());
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.drawer, menu);
return true;
}
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
boolean drawerOpen=mDrawerLayout.isDrawerOpen(mRelativeLayout);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
#Override
public void setTitle(CharSequence title) {
super.setTitle(title);
mTitle=title;
getSupportActionBar().setTitle(mTitle);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class SliderMenuClickListener implements ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id){
displayView(position);
}
private void displayView(int position) {
Fragment fragment=null;
switch (position){
case 0:
fragment=new HomeFragment();
break;
case 1:
fragment=new HomeFragment();
break;
case 2:
fragment=new HomeFragment();
break;
case 3:
fragment=new HomeFragment();
break;
default:break;
}
if(fragment!=null){
FragmentManager fm=getSupportFragmentManager();
fm.beginTransaction().replace(R.id.frame_container,fragment).commit();
mDrawerList.setItemChecked(position,true);
mDrawerList.setSelection(position);
setTitle(navMenuItems[position]);
mDrawerLayout.closeDrawer(mRelativeLayout);
}else{
Log.e("DrawerActivity","Error creating fragment");
}
}
}
}

Changing fragment on clicking on Imageview

I create a project with the NavigationDrawerFragment, and I set the fragments for the menu. Switching between menus fragments are working. But now I create an imageview on one of the fragments. and I want that when you click on the imageview it changes fragment just like the menu.
MainActivity.java
package com.****.****;
import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.Fragment;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.widget.DrawerLayout;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {#link #restoreActionBar()}.
*/
private CharSequence mTitle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
#Override
public void onNavigationDrawerItemSelected(int position) {
Fragment objFragment = null;
switch (position) {
case 0:
objFragment = new news_Fragment();
break;
case 1:
objFragment = new heroes_Fragment();
break;
case 2:
objFragment = new game_Fragment();
break;
}
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, objFragment)
.commit();
}
public void onSectionAttached(int number) {
switch (number) {
case 1:
mTitle = getString(R.string.title_section1);
break;
case 2:
mTitle = getString(R.string.title_section2);
break;
case 3:
mTitle = getString(R.string.title_section3);
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.main, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
heroes_Fragment.java
package com.****.****;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Calvin on 27/12/2014.
*/
public class heroes_Fragment extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.trac_layout, container, false);
}
public View trac(View view, LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.trac_layout, container, false);
}
}
heroes_layout.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:background="#drawable/header_bg">
<TableLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignWithParentIfMissing="false"
android:id="#+id/tableLayout"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true">
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/icontrac"
android:src="#drawable/icon_portrait_trac"
android:layout_column="0"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp"
android:clickable="true"
android:onClick="trac"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/iconreap"
android:src="#drawable/icon_portrait_reap"
android:layout_column="1"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/iconwid"
android:src="#drawable/icon_portrait_wid"
android:layout_column="2"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp" />
</TableRow>
</TableLayout>
</RelativeLayout>
trac_Fragment.java
package com.****.****;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Calvin on 27/12/2014.
*/
public class trac_Fragment extends Fragment {
}
}
I want that when you click on the imageview (trac) it changes fragment. As if we change activity.
And sorry for my English.
I tried to use trac() methode but the apps crash

You did set in layout android:onClick="trac", but you never used trac() method.
You should declare trac() {...} under appropriate class (where you implement that heroes_layout.xml), and resolve call of new activity there (using Intents)

Thanks Gudin for your help. You really help me. Fragment are very complex to understand. I solved my problem.
package com.****.****;
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.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
/**
* Created by Calvin on 27/12/2014.
*/
public class heroes_Fragment extends Fragment implements OnClickListener{
Button btnChange;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.heroes_layout, container, false);
ImageButton btntrac = (ImageButton) view.findViewById(R.id.icontrac);
btntrac.setOnClickListener(this);
return view;
}
public void onClick(View v) {
trac(v);
}
android.support.v4.app.FragmentManager manager;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
manager=getFragmentManager();
}
public void trac(View view) {
android.support.v4.app.FragmentTransaction transaction =manager.beginTransaction();
transaction.replace(R.id.container,new trac_Fragment());
transaction.addToBackStack(null);
transaction.commit();
}
}
This is working.

How do I make this into one activity?

I'm doing this tutorial, but I'm having some trouble with understanding how to make this into one activity. (In the tutorial, you would have Main Activity and Display Message Activity, but for my purposes, I need it to be in one activity) I understand how everything works, but I just can't figure out how to make this into one activity. Any help is appreciated!
Here is the tutorial I'm working on: https://developer.android.com/training/basics/firstapp/building-ui.html
And I'll include my code below, but it's probably easier to see where I am in the tutorial (I'm at the step, "Starting Another Activity").
fragment_main.xml
<?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="horizontal">
<EditText android:id="#+id/edit_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="#string/edit_message" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_send"
android:onClick="sendMessage" />
</LinearLayout>
MainActivity.java
package com.example.helloworld;
import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.content.Intent;
import android.os.Build;
public class MainActivity extends Activity {
public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
}

If you want to change the layout when a button is pressed and display hello world you can use your fragment PlaceholderFragment inside your MainActivity to display it
sample:
public void sendMessage(View view) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
Fragment:
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView tx = (TextView)rootView.findViewById(R.id.hello_world);
tx.setText(editText.getText().toString());
return rootView;
}
}
In your fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/start_screen"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
android:id="#+id/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="40sp"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>