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RecyclerView error: No adapter attached; skipping layout

When I try to add RecyclerView in the sample application, I get an error E/RecyclerView: No adapter attached; skipping layout.
Because of this, the data which is successfully retrieved from my server does not appear on the screen (empty)
This in my code
MainActivity
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
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;
import android.view.View;
import android.widget.Toast;
import page.DefaultFragment;
import page.HomeFragment;
import page.ProfileFragment;
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private static final String TAG = MainActivity.class.getSimpleName();
private final static String API_KEY = "7e8f60e325cd06e164799af1e317d7a7";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_test);
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);
Fragment fragment = null;
fragment = new DefaultFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.root, fragment);
fragmentTransaction.commit();
}
#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();
Fragment fragment = null;
String title = getString(R.string.app_name);
if (id == R.id.nav_camera) {
fragment = new HomeFragment();
title = "Home";
} else if (id == R.id.nav_gallery) {
fragment = new ProfileFragment();
title = "Profile";
} 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) {
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.root, fragment);
fragmentTransaction.commit();
getSupportActionBar().setTitle(title);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
public void showToast(String output){
Toast.makeText(this.getBaseContext(), output, Toast.LENGTH_SHORT).show();
}
}
My Fragment code
package page;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.transvision.bertho.transvisiondashboardapp.R;
import java.util.List;
import adapter.ChannelAdapter;
import model.Channel;
import model.ChannelResponse;
import rest.ApiClient;
import rest.ApiInterface;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class HomeFragment extends Fragment {
private RecyclerView recyclerView;
private static final String TAG = HomeFragment.class.getSimpleName();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.movies_recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
getChannelData();
// Inflate the layout for this fragment
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onDetach() {
super.onDetach();
}
public void getChannelData() {
ApiInterface apiService = ApiClient.getChannel().create(ApiInterface.class);
Call<ChannelResponse> call = apiService.getItems();
call.enqueue(new Callback<ChannelResponse>() {
#Override
public void onResponse(Call<ChannelResponse> call, Response<ChannelResponse> response) {
int statusCode = response.code();
List<Channel> channel = response.body().getItems();
recyclerView.setAdapter(new ChannelAdapter(channel, R.layout.list_channel, getActivity()));
}
#Override
public void onFailure(Call<ChannelResponse> call, Throwable t) {
// Log error here since request failed
Log.e(TAG, t.toString());
showToast("CONNECTION ERROR");
}
});
}
public void showToast(String output){
Toast.makeText(getActivity(), output, Toast.LENGTH_SHORT).show();
}
}
My adapter
package adapter;
import android.content.Context;
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.LinearLayout;
import android.widget.TextView;
import com.transvision.bertho.transvisiondashboardapp.R;
import java.util.List;
import model.Channel;
public class ChannelAdapter extends RecyclerView.Adapter<ChannelAdapter.ChannelViewHolder> {
private List<Channel> channels;
private int rowLayout;
private Context context;
public static class ChannelViewHolder extends RecyclerView.ViewHolder {
LinearLayout moviesLayout;
TextView movieTitle;
TextView data;
TextView movieDescription;
TextView rating;
TextView name;
TextView code;
TextView description;
TextView number;
TextView definition;
TextView paket;
ImageView logo;
public ChannelViewHolder(View v) {
super(v);
moviesLayout = (LinearLayout) v.findViewById(R.id.movies_layout);
name = (TextView) v.findViewById(R.id.title);
definition = (TextView) v.findViewById(R.id.subtitle);
description = (TextView) v.findViewById(R.id.description);
// rating = (TextView) v.findViewById(R.id.rating);
}
}
public ChannelAdapter(List<Channel> channels, int rowLayout, Context context) {
this.channels = channels;
this.rowLayout = rowLayout;
this.context = context;
}
#Override
public ChannelAdapter.ChannelViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(rowLayout, parent, false);
return new ChannelViewHolder(view);
}
#Override
public void onBindViewHolder(ChannelViewHolder holder, final int position) {
holder.name.setText(channels.get(position).getName());
holder.definition.setText(channels.get(position).getDefinition());
holder.description.setText(channels.get(position).getDescription());
// holder.rating.setText(channels.get(position).getVoteAverage().toString());
}
#Override
public int getItemCount() {
return channels.size();
}
}
Is there anything wrong in my code? Or wrong in code placement?
Thanks

Getting data from internet is an async task and may takes too long, here you don't bind any adapter to the recyclerView until you get a response and this is not the usual right way, If you don't get any response for some reasons (e.g no internet connection), then recyclerView.setAdapter won't run, So I suggest you to create an empty adapter first, Then whenever you get response just update the adapter :
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.movies_recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
//Pass empty list to (predefined) adapter
adapter = new ChannelAdapter (new ArrayList<>(), rowLayout, getActivity());
//Bind it to recyclerView
recyclerView.setAdapter(adapter);
getChannelData();
// Inflate the layout for this fragment
return rootView;
}
Add some method to your adapter in case you want add Channel :
public void addChannel(Channel channel) {
channels.add(channel);
notifyDatasetChanged();//even better notifyItemInserted();
}
Now in your response listener add the response body that you got to the adapter:
#Override
public void onResponse(Call<ChannelResponse> call, Response<ChannelResponse> response) {
//Use a loop to add channels you got
adapter.addChannel(responsebodyItems);
}

How to change the ActionBar title from the fragment class in Android Studio?

please help me..
i use the builtin Navigation Drawer Activity in Android Studio..
what i want is to change the Bar title from fragment..
here is my code
MainActivity.java
package com.example.administrator.mosbeau;
import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.app.Fragment;
import android.app.FragmentManager;
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.support.v4.widget.DrawerLayout;
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;
Boolean InternetAvailable = false;
Seocnd detectconnection;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
detectconnection = new Seocnd(this);
InternetAvailable = detectconnection.InternetConnecting();
if (InternetAvailable) {
} else {
NointernetFragment fragment = new NointernetFragment();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment)
.commit();
}
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) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
fragment = new HomeFragment();
break;
case 1:
fragment = new AccountFragment();
break;
}
if (fragment == null) {
fragment = new HomeFragment();
}
// update the main content by replacing fragments
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment)
.commit();
}
public void onSectionAttached(int number) {
switch (number) {
case 1:
mTitle = getString(R.string.title_home);
break;
case 2:
mTitle = getString(R.string.title_account);
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));
}
}
}
NavigationDrawerFragment.java
package com.example.administrator.mosbeau;
import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
/**
* Fragment used for managing interactions for and presentation of a navigation drawer.
* See the <a href="https://developer.android.com/design/patterns/navigation-drawer.html#Interaction">
* design guidelines</a> for a complete explanation of the behaviors implemented here.
*/
public class NavigationDrawerFragment extends Fragment {
/**
* Remember the position of the selected item.
*/
private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
/**
* Per the design guidelines, you should show the drawer on launch until the user manually
* expands it. This shared preference tracks this.
*/
private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
/**
* A pointer to the current callbacks instance (the Activity).
*/
private NavigationDrawerCallbacks mCallbacks;
/**
* Helper component that ties the action bar to the navigation drawer.
*/
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private ListView mDrawerListView;
private View mFragmentContainerView;
private int mCurrentSelectedPosition = 0;
private boolean mFromSavedInstanceState;
private boolean mUserLearnedDrawer;
public NavigationDrawerFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Read in the flag indicating whether or not the user has demonstrated awareness of the
// drawer. See PREF_USER_LEARNED_DRAWER for details.
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
if (savedInstanceState != null) {
mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
mFromSavedInstanceState = true;
}
// Select either the default item (0) or the last selected item.
selectItem(mCurrentSelectedPosition);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// Indicate that this fragment would like to influence the set of actions in the action bar.
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mDrawerListView = (ListView) inflater.inflate(
R.layout.fragment_navigation_drawer, container, false);
mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
});
mDrawerListView.setAdapter(new ArrayAdapter<String>(
getActionBar().getThemedContext(),
android.R.layout.simple_list_item_activated_1,
android.R.id.text1,
new String[]{
getString(R.string.title_home),
getString(R.string.title_account),
}));
mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
return mDrawerListView;
}
public boolean isDrawerOpen() {
return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
}
/**
* Users of this fragment must call this method to set up the navigation drawer interactions.
*
* #param fragmentId The android:id of this fragment in its activity's layout.
* #param drawerLayout The DrawerLayout containing this fragment's UI.
*/
public void setUp(int fragmentId, DrawerLayout drawerLayout) {
mFragmentContainerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the navigation drawer and the action bar app icon.
mDrawerToggle = new ActionBarDrawerToggle(
getActivity(), /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.string.navigation_drawer_open, /* "open drawer" description for accessibility */
R.string.navigation_drawer_close /* "close drawer" description for accessibility */
) {
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if (!isAdded()) {
return;
}
getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!isAdded()) {
return;
}
if (!mUserLearnedDrawer) {
// The user manually opened the drawer; store this flag to prevent auto-showing
// the navigation drawer automatically in the future.
mUserLearnedDrawer = true;
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(getActivity());
sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
}
getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
};
// If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
// per the navigation drawer design guidelines.
if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
mDrawerLayout.openDrawer(mFragmentContainerView);
}
// Defer code dependent on restoration of previous instance state.
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mDrawerToggle.syncState();
}
});
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
private void selectItem(int position) {
mCurrentSelectedPosition = position;
if (mDrawerListView != null) {
mDrawerListView.setItemChecked(position, true);
}
if (mDrawerLayout != null) {
mDrawerLayout.closeDrawer(mFragmentContainerView);
}
if (mCallbacks != null) {
mCallbacks.onNavigationDrawerItemSelected(position);
}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallbacks = (NavigationDrawerCallbacks) activity;
} catch (ClassCastException e) {
throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
}
}
#Override
public void onDetach() {
super.onDetach();
mCallbacks = null;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Forward the new configuration the drawer toggle component.
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// If the drawer is open, show the global app actions in the action bar. See also
// showGlobalContextActionBar, which controls the top-left area of the action bar.
if (mDrawerLayout != null && isDrawerOpen()) {
inflater.inflate(R.menu.global, menu);
showGlobalContextActionBar();
}
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
if (item.getItemId() == R.id.action_example) {
Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Per the navigation drawer design guidelines, updates the action bar to show the global app
* 'context', rather than just what's in the current screen.
*/
private void showGlobalContextActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setTitle(R.string.app_name);
}
private ActionBar getActionBar() {
return ((ActionBarActivity) getActivity()).getSupportActionBar();
}
/**
* Callbacks interface that all activities using this fragment must implement.
*/
public static interface NavigationDrawerCallbacks {
/**
* Called when an item in the navigation drawer is selected.
*/
void onNavigationDrawerItemSelected(int position);
}
}
I want to change the Bar Title in every fragment displayed like
HomeFragment.java
package com.example.administrator.mosbeau;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Administrator on 9/7/2015.
*/
public class HomeFragment extends Fragment {
Boolean InternetAvailable = false;
Seocnd detectconnection;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.homelayout, container, false);
detectconnection = new Seocnd(getActivity());
InternetAvailable = detectconnection.InternetConnecting();
if (InternetAvailable) {
} else {
NointernetFragment fragment = new NointernetFragment();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment)
.commit();
}
return rootView;
}
}
EDIT: PLEASE HELP ME..

Based on your code you don't need to change action bar title from fragment
you can change inside your switch case
#Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
String title = "";
switch (position) {
case 0:
fragment = new HomeFragment();
title="Home";
break;
case 1:
fragment = new AccountFragment();
title="Accounts";
break;
}
if (fragment == null) {
fragment = new HomeFragment();
}
// update the main content by replacing fragments
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment)
.commit();
getSupportActionBar().setTitle(title);
}
Even if you want to change actionbar from fragment use interface
Create a interface inside fragment
Implement the Interface in Activity
When you want to change actionbar using callback call the interface function in Activity

add + 1 to onSectionAttached
public void onSectionAttached(int number) {
switch (number + 1) { // add +1 here
case 1:
mTitle = getString(R.string.title_home);
break;
case 2:
mTitle = getString(R.string.title_account);
break;
}
}

Android: Tab view fragment

I'm trying to implement a swipe tab views like this http://www.androidhive.info/2013/10/android-tab-layout-with-swipeable-views-1/.
But when I try to implement getItems method in the Adapter, it doesn't accept my custom Fragment.
Here's the code:
MyActivity.java
package com.bob.app;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.*;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends AppCompatActivity implements android.support.v7.app.ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private String[] tabs = { getString(R.string.tab_home), getString(R.string.tab_city), getString(R.string.tab_name),getString(R.string.tab_favorites) };
private DrawerLayout drawerLayout;
private ListView listView;
private String[] Drawer_menu_item;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final android.support.v7.app.ActionBar actionbar = getSupportActionBar();
actionbar.setNavigationMode(android.support.v7.app.ActionBar.NAVIGATION_MODE_TABS);
viewPager = (ViewPager) findViewById(R.id.pager);
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionbar.setHomeButtonEnabled(true);
// Adding Tabs
for (String tab_name : tabs) {
actionbar.addTab(actionbar.newTab().setText(tab_name)
.setTabListener((android.support.v7.app.ActionBar.TabListener) this));
Drawer_menu_item= getResources().getStringArray(R.array.menu_item);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
listView = (ListView) findViewById(R.id.left_drawer);
// Set the adapter for the list view
listView.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer, Drawer_menu_item));
/* Set the list's click listener
listView.setOnItemClickListener(new DrawerItemClickListener());*/
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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);
}
#Override
public void onTabSelected(android.support.v7.app.ActionBar.Tab tab, android.support.v4.app.FragmentTransaction ft) {
}
#Override
public void onTabUnselected(android.support.v7.app.ActionBar.Tab tab, android.support.v4.app.FragmentTransaction ft) {
}
#Override
public void onTabReselected(android.support.v7.app.ActionBar.Tab tab, android.support.v4.app.FragmentTransaction ft) {
}
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
/* Home fragment
return new Home_fragment();
case 1:
/* City fragment
return new City_fragment();
case 2:
/* Name fragment
return new Name_fragment();
case 3:
/* Favourites fragment
return new Fav_fragment();
}
return null;
}
#Override
public int getCount() {
// get item count - equal to number of tabs
return tabs.length;
}
}
}
Name_fragment.java
package com.bob.sluurpy.app;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by boob on 11/09/15.
*/
public class Name_fragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.name, container, false);
return rootView;
}
}

Please import this import android.support.v4.app.Fragment; in place of import android.app.Fragment; in Name_fragment this may solve your issue!

which oncreate (bundle) will call in activity

I have created a activity(MainActivity.java) extends to Activity.java
and again I create the another activity(prodicts.java) now here I extends this activity(products.java) to MainActivity.java
So my question is that which onCreate(bundle) will call in my products.java class its super class onCreate(bundle) or its own onCreate(bundle) and my code is below:
MainActivity.java
import java.util.Locale;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.SearchManager;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity {
protected DrawerLayout mDrawerLayout;
private ListView mDrawerList;
public ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mPlanetTitles;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.drawer);
mTitle = mDrawerTitle = getTitle();
mPlanetTitles = getResources().getStringArray(R.array.List_Content);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
mDrawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, mPlanetTitles));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
// enable ActionBar app icon to behave as action to toggle nav drawer
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description for accessibility */
R.string.drawer_close /* "close drawer" description for accessibility */
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
//displayView(0);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
/* Called whenever we call invalidateOptionsMenu() */
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
// If the nav drawer is open, hide action items related to the content view
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
// ActionBarDrawerToggle will take care of this.
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action buttons
switch(item.getItemId()) {
case R.id.action_websearch:
// create intent to perform web search for this planet
Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());
// catch event that there's no activity to handle intent
if (intent.resolveActivity(getPackageManager()) != null) {
startActivity(intent);
} else {
Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/* The click listner for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
displayView(position);
}
}
#SuppressWarnings("unused")
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0: Intent product = new Intent(MainActivity.this,Products.class);
startActivity(product);
break;
case 1: Intent notes = new Intent (MainActivity.this,Notes.class);
startActivity(notes);
break;
case 2: Intent Contacts = new Intent (MainActivity.this,Contacts.class);
startActivity(Contacts);
break;
case 3:
Intent viewPdf = new Intent (MainActivity.this,pdfView.class);
startActivity(viewPdf);
break;
case 4:
Intent search = new Intent (MainActivity.this,search.class);
startActivity(search);
break;
/*case 5:
fragment = new WhatsHotFragment();
break;*/
default:
break;
}
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
//setTitle(mDrawerList[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
#Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
/**
* Fragment that appears in the "content_frame", shows a planet
*/
public static class PlanetFragment extends Fragment {
public static final String ARG_PLANET_NUMBER = "planet_number";
public PlanetFragment() {
// Empty constructor required for fragment subclasses
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
int i = getArguments().getInt(ARG_PLANET_NUMBER);
String planet = getResources().getStringArray(R.array.List_Content)[i];
int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
"drawable", getActivity().getPackageName());
((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
getActivity().setTitle(planet);
return rootView;
}
}
}
and products.java
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.Toast;
public class Products extends MainActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
LayoutInflater inflater = (LayoutInflater) this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View contentView = inflater.inflate(R.layout.products, null, false);
mDrawerLayout.addView(contentView, 0);
GridView gridview = (GridView)findViewById(R.id.productgridview);
gridview.setAdapter(new ImageAdapter(this));
gridview.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(Products.this, " "+position, Toast.LENGTH_SHORT).show();
}
});
}
}
So please tell what will happen in this Activity , I am confused about it.
when i will call the products.java class which onCreate(bundle) it will call MainActivity.java's onCreate(bundle) or products.java's onCreate(bundle).

onCreate() of Product Class will be called, then onCreate() of MainActivity class and finally onCreate() of Activity class will be called.

Android:Painting in FragmentClass

I am using navigationdrawer in an activity.If I click any of the item in the navigation drawer
in default with some color it should allow us to paint some thing.But I tried for a long time i was unable to do it.Kindly hep as soon as possible.Below is my code which i am using.
Painting.java
package com.example.painturselfnew;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
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.Toast;
#TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public class Painting extends Activity {
private ListView mdrawerlist;
private DrawerLayout mdrawerlayout;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mdrawertitle;
private CharSequence mtitle;
private String[] mfragmenttitles;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_painting);
mtitle = mdrawertitle = getTitle();
mfragmenttitles = getResources().getStringArray(R.array.widgets);
mdrawerlayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mdrawerlist = (ListView) findViewById(R.id.left_drawer);
mdrawerlist.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, mfragmenttitles));
getActionBar().setDisplayShowHomeEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
mdrawerlist.setOnItemClickListener(new DrawerItemClickListener());
mDrawerToggle = new ActionBarDrawerToggle(this, mdrawerlayout,
R.drawable.ic_launcher, R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mtitle);
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mdrawertitle);
invalidateOptionsMenu();
}
};
mdrawerlayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.painting, menu);
return true;
}
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
boolean draweropen = mdrawerlayout.isDrawerOpen(mdrawerlist);
menu.findItem(R.id.action_settings).setVisible(!draweropen);
return super.onPrepareOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_settings:
if (mdrawerlayout.isDrawerOpen(mdrawerlist)) {
mdrawerlayout.closeDrawer(mdrawerlist);
} else {
mdrawerlayout.openDrawer(mdrawerlist);
}
mdrawerlayout.openDrawer(mdrawerlist);
/*
* Toast.makeText(getApplicationContext(), "Options Selected",
* Toast.LENGTH_LONG).show();
*/
return true;
case android.R.id.home:
startActivity(new Intent(Painting.this, MainActivity.class));
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
private class DrawerItemClickListener implements
ListView.OnItemClickListener {
public void onItemClick(AdapterView<?> parent, View v, int position,
long id) {
selectItem(position);
}
}
private void selectItem(int position) {
Fragment fragment = new Fragment();
Bundle args = new Bundle();
// args.putInt(Fragment.ARG_PLANET_NUMBER, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
switch (position) {
case 0:
fragment = new Fragment1();
Toast.makeText(getApplicationContext(), "Camera Selected",
Toast.LENGTH_LONG).show();
break;
case 1:
fragment = new Fragment2();
Toast.makeText(getApplicationContext(), "Color Selected",
Toast.LENGTH_LONG).show();
break;
case 2:
/*
* PaintFragment fragment1; fragment1 = new PaintFragment();
*/
PaintFragment fragment1 = new PaintFragment();
Toast.makeText(getApplicationContext(), "Paint Selected",
Toast.LENGTH_LONG).show();
break;
case 3:
fragment = new Fragment4();
Toast.makeText(getApplicationContext(), "Save selected",
Toast.LENGTH_LONG).show();
break;
case 4:
fragment = new Fragment5();
Toast.makeText(getApplicationContext(), "Share Selected",
Toast.LENGTH_LONG).show();
break;
case 5:
fragment = new Fragment6();
Toast.makeText(getApplicationContext(), "ArtBy Selected",
Toast.LENGTH_LONG).show();
break;
case 6:
fragment = new Fragment7();
Toast.makeText(getApplicationContext(), "Refresh Selected",
Toast.LENGTH_LONG).show();
break;
}
fragmentManager.beginTransaction()
.replace(R.id.content_frame, fragment).commit();
mdrawerlist.setItemChecked(position, true);
setTitle(mfragmenttitles[position]);
mdrawerlayout.closeDrawer(mdrawerlist);
}
#Override
public void setTitle(CharSequence title) {
mtitle = title;
getActionBar().setTitle(mtitle);
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
PainitngFragment.java
package com.example.painturselfnew;
import android.annotation.TargetApi;
import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Build;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class PaintFragment extends Activity {
/*private static int displayWidth = 0;
private static int displayHeight = 0;
*/
/*
* #Override public void onCreate(Bundle savedInstanceState) {
* super.onCreate(savedInstanceState);
* //setContentView(R.layout.activity_fragment3); //setContentView(new
* MyView(this));
*
*
* }
*/
/*public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {*/
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
BrushView view=new BrushView(this);
setContentView(view);
addContentView(view.btnEraseAll, view.params);
/*
* View view = inflater.inflate(R.layout.activity_fragment3, container,
* false);
*/
// getActivity();
/*
* Display display =
* ((WindowManager)this.getSystemService(Context.WINDOW_SERVICE
* )).getDefaultDisplay(); displayWidth = display.getWidth();
* displayHeight = display.getHeight();
*/
//ImageView iv = (ImageView) view.findViewById(R.id.imageView1);
/*
* iv.setOnClickListener(new View.OnClickListener() {
*
* #Override public void onClick(View arg0) { // TO DO Auto-generated
* method stub
*
* BrushView view = new BrushView(getActivity()); //setContentView(new
* BrushView(this)); } });
*/
//return view;
}
#Override
protected void onPause() {
super.onPause();
finish();
}
public class BrushView extends View {
private Paint brush = new Paint();
private Path path = new Path();
public Button btnEraseAll;
public LayoutParams params;
public BrushView(Context paintFragment) {
super(paintFragment);
brush.setAntiAlias(true);
brush.setColor(Color.BLUE);
brush.setStyle(Paint.Style.STROKE);
brush.setStrokeJoin(Paint.Join.ROUND);
brush.setStrokeWidth(15f);
btnEraseAll = new Button(paintFragment);
btnEraseAll.setText("Erase Everything!!");
params = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT);
btnEraseAll.setLayoutParams(params);
btnEraseAll.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// reset the path
path.reset();
// invalidate the view
postInvalidate();
}
});
}
#Override
public boolean onTouchEvent(MotionEvent event) {
float pointX = event.getX();
float pointY = event.getY();
// Checks for the event that occurs
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
path.moveTo(pointX, pointY);
return true;
case MotionEvent.ACTION_MOVE:
path.lineTo(pointX, pointY);
break;
case MotionEvent.ACTION_UP:
break;
default:
return false;
}
// Force a view to draw.
postInvalidate();
return false;
}
#Override
protected void onDraw(Canvas canvas) {
canvas.drawPath(path, brush);
}
}
}
Thanks In Advance...