Develop Reference

How to putExtra in FragmentTransaction Android SDK 21

I have converted my app from activity views to fragment, but I don't know how to pass the extra info to my new fragment. Here I create a new fragment from another fragment.
This was the old working code
Launch a new Activity to display the selected sensor
Intent intent = new Intent(getActivity(), SensorViewFragment.class);
// Push the sensor index to the new Activity
intent.putExtra(SensorViewFragment.SENSOR_INDEX_EXTRA, position);
// Start the activity
startActivity(intent);*/
And this is the new code in which I don't know how to putExtra
// Set a listener to respond to list item clicks
sensorListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// Create new fragment and transaction
Fragment newFragment = new SensorViewFragment();
// consider using Java coding conventions (upper first char class names!!!)
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.replace(R.id.container, newFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
});

The recommended solution is to use an arguments Bundle. That way the data, as with your old extras, is automatically retained on a configuration change, in the recent-tasks list, etc.
Google's typical approach is to use a factory method (newInstance()) on the fragment class to handle packaging data into the arguments Bundle.
For example, in this sample app, I am creating fragments for a ViewPager. I want to pass the position (page number) into the fragments, so the fragments can use that in the UI.
On my fragment class (EditorFragment), I have a newInstance() factory method that puts the supplied position into the arguments Bundle, and I use the value in my onCreateView() method via getArguments():
/***
Copyright (c) 2012-14 CommonsWare, LLC
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy
of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
by applicable law or agreed to in writing, software distributed under the
License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
OF ANY KIND, either express or implied. See the License for the specific
language governing permissions and limitations under the License.
From _The Busy Coder's Guide to Android Development_
http://commonsware.com/Android
*/
package com.commonsware.android.pager;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
public class EditorFragment extends Fragment {
private static final String KEY_POSITION="position";
static EditorFragment newInstance(int position) {
EditorFragment frag=new EditorFragment();
Bundle args=new Bundle();
args.putInt(KEY_POSITION, position);
frag.setArguments(args);
return(frag);
}
#Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
View result=inflater.inflate(R.layout.editor, container, false);
EditText editor=(EditText)result.findViewById(R.id.editor);
int position=getArguments().getInt(KEY_POSITION, -1);
editor.setHint(String.format(getString(R.string.hint), position + 1));
return(result);
}
}
When I want to create an instance of the fragment, I just use the factory method (EditorFragment.newInstance(position)).

How to implement navigation drawer with fragments master detail

i have get the sample navigation drawer from this site :
http://www.androidhive.info/2013/11/android-sliding-menu-using-navigation-drawer/
and the master detail from here :
http://wptrafficanalyzer.in/blog/itemclick-handler-for-listfragment-in-android/
the error LogCat oncreateview(inflac....) the view
can not be created
me i have try that
//the main activiry as Activity:
package in.wptrafficanalyzer.listfragmentitemclick;
import in.wptrafficanalyzer.listfragmentitemclick.adapter.NavDrawerListAdapter;
import in.wptrafficanalyzer.listfragmentitemclick.model.NavDrawerItem;
import java.util.ArrayList;
import in.wptrafficanalyzer.listfragmentitemclick.R;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.app.ListFragment;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
public class MainActivity extends Activity implements CountryListFragment.ListFragmentItemClickListener {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
displayView(position);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/***
* Called when invalidateOptionsMenu() is triggered
*/
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
// update the main content by replacing fragments
ListFragment fragment = null;
switch (position) {
case 0:
//fragment = new HomeFragment();
break;
case 1:
fragment = new CountryListFragment();
break;
case 2:
//fragment = new PhotosFragment();
break;
case 3:
// fragment = new CommunityFragment();
break;
case 4:
//fragment = new PagesFragment();
break;
case 5:
//fragment = new WhatsHotFragment();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.country_list_fragment, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
#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);
}
/** Called when the activity is first created. */
#Override
public void onListFragmentItemClick(int position) {
/** Getting the orientation ( Landscape or Portrait ) of the screen */
int orientation = getResources().getConfiguration().orientation;
/** Landscape Mode */
if(orientation == Configuration.ORIENTATION_LANDSCAPE ){
/** Getting the fragment manager for fragment related operations */
FragmentManager fragmentManager = getFragmentManager();
/** Getting the fragmenttransaction object, which can be used to add, remove or replace a fragment */
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
/** Getting the existing detailed fragment object, if it already exists.
* The fragment object is retrieved by its tag name
* */
Fragment prevFrag = fragmentManager.findFragmentByTag("in.wptrafficanalyzer.country.details");
/** Remove the existing detailed fragment object if it exists */
if(prevFrag!=null)
fragmentTransaction.remove(prevFrag);
/** Instantiating the fragment CountryDetailsFragment */
CountryDetailsFragment fragment = new CountryDetailsFragment();
/** Creating a bundle object to pass the data(the clicked item's position) from the activity to the fragment */
Bundle b = new Bundle();
/** Setting the data to the bundle object */
b.putInt("position", position);
/** Setting the bundle object to the fragment */
fragment.setArguments(b);
/** Adding the fragment to the fragment transaction */
fragmentTransaction.add(R.id.detail_fragment_container, fragment,"in.wptrafficanalyzer.country.details");
/** Adding this transaction to backstack */
fragmentTransaction.addToBackStack(null);
/** Making this transaction in effect */
fragmentTransaction.commit();
}else{ /** Portrait Mode or Square mode */
/** Creating an intent object to start the CountryDetailsActivity */
Intent intent = new Intent("in.wptrafficanalyzer.CountryDetailsActivity");
/** Setting data ( the clicked item's position ) to this intent */
intent.putExtra("position", position);
/** Starting the activity by passing the implicit intent */
startActivity(intent);
}
}
}
the CountryListFragment as listfragment :
package in.wptrafficanalyzer.listfragmentitemclick;
import android.app.Activity;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class CountryListFragment extends ListFragment{
/** List of countries to be displayed in the ListFragment */
ListFragmentItemClickListener ifaceItemClickListener;
/** An interface for defining the callback method */
public interface ListFragmentItemClickListener {
/** This method will be invoked when an item in the ListFragment is clicked */
void onListFragmentItemClick(int position);
}
/** A callback function, executed when this fragment is attached to an activity */
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try{
/** This statement ensures that the hosting activity implements ListFragmentItemClickListener */
ifaceItemClickListener = (ListFragmentItemClickListener) activity;
}catch(Exception e){
Toast.makeText(activity.getBaseContext(), "Exception",Toast.LENGTH_SHORT).show();
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
/** Data source for the ListFragment */
ArrayAdapter<String> adapter = new ArrayAdapter<String>(inflater.getContext(), android.R.layout.simple_list_item_1, Country.name);
/** Setting the data source to the ListFragment */
setListAdapter(adapter);
return super.onCreateView(inflater, container, savedInstanceState);
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
/** Invokes the implementation of the method istFragmentItemClick in the hosting activity */
ifaceItemClickListener.onListFragmentItemClick(position);
}
}
layout main in folder 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">
<FrameLayout
android:id="#+id/country_list_fragment"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:name="in.wptrafficanalyzer.listfragmentitemclick.CountryListFragment"
/>
<!-- Listview to display slider menu -->
<ListView
android:id="#+id/list_slidermenu"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="#color/list_divider"
android:dividerHeight="1dp"
android:listSelector="#drawable/list_selector"
android:background="#color/list_background"/>
> </android.support.v4.widget.DrawerLayout>
layout main in the folder layout-land
><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">
<FrameLayout
android:id="#+id/country_list_fragment"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:name="in.wptrafficanalyzer.listfragmentitemclick.CountryListFragment"
/>
<FrameLayout
android:id="#+id/detail_fragment_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_gravity="center"
/>
<!-- Listview to display slider menu -->
<ListView
android:id="#+id/list_slidermenu"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="#color/list_divider"
android:dividerHeight="1dp"
android:listSelector="#drawable/list_selector"
android:background="#color/list_background"/>
></android.support.v4.widget.DrawerLayout>

I was confused by this, too. I set up the Navigation Drawer to navigate between major sections of my app. Then I wanted one of those major sections to be set up as Master/Detail. I knew it was possible, since this is basically what Gmail is, but was having a hard time putting what I had already built together with what Eclipse spits out when generating a Master/Detail Activity.
I couldn't just launch the ItemListFragment (Master/Detail) from the MainActivity (Navigation Drawer), because ItemListFragment wants to attach to ItemListActivity, not MainActivity, and a fragment can't have two Activities.
I finally found a tutorial on it that actually used the two design ideas together:
http://blog.evizija.si/android-layout/
I just followed their example and got my UI working as desired in about 5 minutes. It's actually incredibly simple. You make MasterActivity look a bit more like the generated ItemListActivity (ie. implement TaskListFragment.Callbacks, copy over the onItemSelected method, and a chuck of onCreate) and you're done!
I hope this helps solve your problem! Happy coding!
UPDATE: Elaborating on the steps involved (info from link), based on feedback in comments on improving my answer.
(1) Make your drawer activity and fragments, lets call them MainActivity and some fragments we don't care about here. Personally, I would create an empty Fragment, like ItemFragement for example, to be a place holder for the Master/Detail while I get the Drawer up and running. Then once the Drawer is working as desired, tackle the Master/Detail and linking them.
(2) Use the IDE wizard (I'm running Eclipse) to make the activities and fragments of master/detail flow. I'll refer to them by their default names: ItemListActivity, ItemListFragement, ItemDetailActivity, ItemDetailFragment.
(3) If you've used Master/Detail before, you know most of your logic goes into the fragment. This is still true when combining Master/Detail with Drawer. Note, at this point there is no connection between our MainActivity and our Master/Detail flow, and the later may not even be accessible in the UI.
(4) Key Concept: To connect the Drawer with the List, our MainActivity is going to be the hosting Activity for ItemListFragment (rather than the current ItemListActivity). To make this work, we just copy over some of the Master/Detail magic created by the wizard FROM ItemListActivity INTO MainActivity.
(5) Specifically:
(5A) MainActivity implements ItemListFragment.Callbacks (or EmployeeListFragment.Callbacks, AlbumListFragment.Callbacks, whatever you are listing) and implement onItemSelected method
public class MainActivity extends Activity
implements OnItemClickListener, ItemListFragment.Callbacks {
(5B) Copy part of code from onCreate in ItemListActivity and paste it to onCreate in MainActivity. This part:
if (findViewById(R.id.item_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-large and
// res/values-sw600dp). If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
// In two-pane mode, list items should be given the
// 'activated' state when touched.
((ItemListFragment) getFragmentManager()
.findFragmentById(R.id.item_list))
.setActivateOnItemClick(true);
}
(5C) Also copy onItemSelected method from ItemListActivity and paste it into MainActivity. You will already have an onItemSelected method if you told Eclipse to "add unimplemented methods" in response to the error that would have been raised after Step 5A. If you don't, copy over the whole method. (this step edited in response to a question in comments) Code:
if (mTwoPane) {
// In two-pane mode, show the detail view in this activity by
// adding or replacing the detail fragment using a
// fragment transaction.
Bundle arguments = new Bundle();
arguments.putString(ItemDetailFragment.ARG_ITEM_ID, id);
ItemDetailFragment fragment = new ItemDetailFragment();
fragment.setArguments(arguments);
getFragmentManager().beginTransaction()
.replace(R.id.item_detail_container, fragment)
.commit();
} else {
// In single-pane mode, simply start the detail activity
// for the selected item ID.
Intent detailIntent = new Intent(this, ItemDetailActivity.class);
detailIntent.putExtra(ItemDetailFragment.ARG_ITEM_ID, id);
startActivity(detailIntent);
}
(6) Then the last step is to have MainActivity (the Drawer) open ItemListFragment. If you already have a placeholder Fragment launching (like ItemFragement suggested in Step 1), this is just a matter of replacing ItemFragment with ItemListFragment in the onNavigationDrawerItemSelected method.
Hope that's clear. If not, the original link might do a better job explaining than I did. Just skim to the bottom where the blogger talks about adding the list activity to their drawer activity.
cheers.
UPDATE:
After being ask to do so by a moderator, I'm flagging this and another similar question (as duplicates).
Those questions:
https://stackoverflow.com/questions/25403377/combine-navigation-drawer-and-master-detail-layout
Navigation Drawer and master/detail flow

LinearLayout#422725b0 is not a sliding drawer

Hi I have been going crazy with this.
There are several questions out there but none have seems to fix my problem.
I am getting an error when ever I try to style a drawer 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">
<!-- As the main content view, the view below consumes the entire
space available using match_parent in both dimensions. -->
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<LinearLayout
android:id="#+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:gravity="start"
>
<TextView
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:text="test"
android:background="#drawable/black"
android:textColor="#94A1A1"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:minHeight="?android:attr/listPreferredItemHeightSmall"
android:layout_weight="1"
/>
<ListView
android:id="#+id/left_drawer_child"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:choiceMode="singleChoice"
android:divider="#android:color/transparent"
android:dividerHeight="0dp"
android:background="#323232"
android:layout_weight="1"
/>
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
and the Java
/*
* Copyright 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.drawertest;
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.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
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.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
/**
* This example illustrates a common usage of the DrawerLayout widget
* in the Android support library.
* <p/>
* <p>When a navigation (left) drawer is present, the host activity should detect presses of
* the action bar's Up affordance as a signal to open and close the navigation drawer. The
* ActionBarDrawerToggle facilitates this behavior.
* Items within the drawer should fall into one of two categories:</p>
* <p/>
* <ul>
* <li><strong>View switches</strong>. A view switch follows the same basic policies as
* list or tab navigation in that a view switch does not create navigation history.
* This pattern should only be used at the root activity of a task, leaving some form
* of Up navigation active for activities further down the navigation hierarchy.</li>
* <li><strong>Selective Up</strong>. The drawer allows the user to choose an alternate
* parent for Up navigation. This allows a user to jump across an app's navigation
* hierarchy at will. The application should treat this as it treats Up navigation from
* a different task, replacing the current task stack using TaskStackBuilder or similar.
* This is the only form of navigation drawer that should be used outside of the root
* activity of a task.</li>
* </ul>
* <p/>
* <p>Right side drawers should be used for actions, not navigation. This follows the pattern
* established by the Action Bar that navigation should be to the left and actions to the right.
* An action should be an operation performed on the current contents of the window,
* for example enabling or disabling a data overlay on top of the current content.</p>
*/
public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private LinearLayout linearLayout;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mPlanetTitles;
public TextView title;
public int theme = 1;
public int theme2 = 1;
public Drawable background = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(theme == 1){
setTheme(R.style.CustomActionBarTheme);
} else {
setTheme(R.style.CustomActionBarBlueTheme);
}
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
mPlanetTitles = getResources().getStringArray(R.array.planets_array);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer_child);
linearLayout = (LinearLayout)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()
getActionBar().setBackgroundDrawable(background);
}
public void onDrawerOpened(View drawerView) {
// getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(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(linearLayout);
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) {
updatebackground(view,position);
selectItem(position);
}
}
private void updatebackground(View view,int position) {
// update the main content by replacing fragments
int right = view.getPaddingRight();
int left = view.getPaddingLeft();
int top = view.getPaddingTop();
int bottom = view.getPaddingBottom();
switch(position) {
case 0 :
view.setBackgroundResource(R.drawable.redbackground);
background = getResources().getDrawable(R.drawable.red);
break;
case 1 : view.setBackgroundResource(R.drawable.bluebackground);
background = getResources().getDrawable(R.drawable.blue);
break;
case 2 : view.setBackgroundResource(R.drawable.brownbackground);
background = getResources().getDrawable(R.drawable.brown);
break;
case 3 : view.setBackgroundResource(R.drawable.greenbackground);
background = getResources().getDrawable(R.drawable.green);
break;
case 4 : view.setBackgroundResource(R.drawable.orangebackground);
background = getResources().getDrawable(R.drawable.orange);
break;
case 5 : view.setBackgroundResource(R.drawable.purplebackground);
background = getResources().getDrawable(R.drawable.purple);
break;
case 6 : view.setBackgroundResource(R.drawable.pinkbackground);
background = getResources().getDrawable(R.drawable.pink);
break;
case 7 : view.setBackgroundResource(R.drawable.yellowbackground);
background = getResources().getDrawable(R.drawable.yellow);
break;
default: view.setBackgroundResource(R.drawable.blackbackground);
background = getResources().getDrawable(R.drawable.black);
}
view.setPadding(left, top, right, bottom);
getActionBar().setBackgroundDrawable(background);
}
private void selectItem(int position) {
// update the main content by replacing fragments
Fragment fragment = new PlanetFragment();
Bundle args = new Bundle();
args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
fragment.setArguments(args);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mPlanetTitles[position]);
mDrawerLayout.closeDrawer(linearLayout);
}
#Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
if(theme == 1){
theme =2;
}else {
theme =1;
}
}
/**
* 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.planets_array)[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;
}
}
}
The error I am getting is
11-27 00:56:56.545: E/AndroidRuntime(10000): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.drawertest/com.example.drawertest.MainActivity}: java.lang.IllegalArgumentException: View android.widget.LinearLayout#422725b0 is not a sliding drawer
Any help would be great thanks in advance

The view must have either Gravity.LEFT or Gravity.RIGHT to be recognized as a sliding drawer. You can replace
android:gravity="start"
with
android:gravity="left"
or, as suggested above alternatively replace
isDrawerOpen(linearLayout)
with
isDrawerOpen(Gravity.LEFT)

I just added
android:layout_gravity="start"
and that worked for me.

I also had such an issue. After I added
android:layout_gravity="left"
everything worked out fine.

Fragment animation during transaction - Only Left slide in works and Right Slide in does not

I am doing fragment animation during transaction but I am able to do only left slide in. Right slide animation does not affect anything.
Please help: I have tried everything and searched on google and other stackoverflow questions and did all the things they suggested. Still right slide in animation is not doing anything.
Below is the fragment activity :
public class MainActivity extends FragmentActivity {
static FragmentManager manager;
String arr1[] = { "One", "Two", "Three", "Four", "Five", "Six", "Seven" };
String arr2[] = { "One2", "Two2", "Three2", "Four2", "Five2", "Six2",
"Seven2" };
String arr3[] = { "One23", "Two23", "Three23", "Four23", "Five23", "Six23",
"Seven23" };
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
manager = getSupportFragmentManager();
StartTransaction(arr1);
}
#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;
}
public static void StartTransaction(String arr[]) {
FragmentOne one = new FragmentOne();
Bundle b = new Bundle();
b.putStringArray("array", arr);
one.setArguments(b);
FragmentTransaction transaction = manager.beginTransaction();
// PROblem is here
transaction.setCustomAnimations(R.anim.slide_right, R.anim.slide_left);// ,R.anim.slide_right,R.anim.slide_left);
transaction.replace(R.id.container, one);
// transaction.addToBackStack(null);
transaction.commit();
}
private void MoveOneLevelUp() {
FragmentOne one = new FragmentOne();
Bundle b = new Bundle();
b.putInt("moveup", 1);
one.setArguments(b);
FragmentTransaction transaction = manager.beginTransaction();
transaction.setCustomAnimations(R.anim.slide_left, R.anim.slide_right,
R.anim.slide_right, R.anim.slide_left);
transaction.replace(R.id.container, one);
transaction.addToBackStack(null);
transaction.commit();
}
}
Here is the Fragment code :
public class FragmentOne extends Fragment implements OnItemClickListener {
Activity activity;
ListView list;
View v;
String arr1[] = {"One","Two","Three","Four","Five","Six","Seven"};
String arr2[] = { "One2", "Two2", "Three2", "Four2", "Five2", "Six2",
"Seven2" };
String arr3[] = { "One23", "Two23", "Three23", "Four23", "Five23", "Six23",
"Seven23" };
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
activity = getActivity();
String array[] = getArguments().getStringArray("array");
v = LayoutInflater.from(activity).inflate(R.layout.first_view, null);
list = (ListView)v.findViewById(R.id.listview);
list.setOnItemClickListener(this);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, array);
list.setAdapter(adapter);
return v;
// return super.onCreateView(inflater, container, savedInstanceState);
}
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
if(position ==2) {
MainActivity.StartTransaction(arr2);
} else {
MainActivity.StartTransaction(arr3);
}
}
}
Slide left anim xml :
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="700"
android:fromXDelta="-100%"
android:toXDelta="0%" >
</translate>
</set>
Slide right xml :
<?xml version="1.0" encoding="utf-8"?>`enter code here`
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="700"
android:fromXDelta="0%"
android:toXDelta="100%" >
</translate>
</set>

You need a fragment transaction.
Try something like this:
if (mLastMenuWeight > mMenuWeight) {
transaction.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right);
}
else {
transaction.setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left);
}
Keep in mind that mLastMenuWeight and mMenuWeight are used by me to track which animation should I use. You will need to replace this condition with something else.
Since android includes only left-to-right animations, you have to define the right-to-left on your own, using the original animation code. Like this:
slide_in_right.xml:
<?xml version="1.0" encoding="utf-8"?>
<!--
/* //device/apps/common/res/anim/slide_in_left.xml
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
-->
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromXDelta="50%p" android:toXDelta="0"
android:duration="#android:integer/config_mediumAnimTime"/>
<alpha android:fromAlpha="0.0" android:toAlpha="1.0"
android:duration="#android:integer/config_mediumAnimTime" />
</set>
slide_out_left.xml:
<?xml version="1.0" encoding="utf-8"?>
<!--
/* //device/apps/common/res/anim/slide_out_right.xml
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
-->
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromXDelta="0" android:toXDelta="-50%p"
android:duration="#android:integer/config_mediumAnimTime"/>
<alpha android:fromAlpha="1.0" android:toAlpha="0.0"
android:duration="#android:integer/config_mediumAnimTime" />
</set>
Also, you may try to add/attach the new view and detach the old one instead of replace. Perhaps it will result with the same behavior anyway...

Android Fragment getArguments() returns null

As the title suggest.
I've downloaded Fragment code from here, http://developer.android.com/shareables/training/FragmentBasics.zip.
It is Fragment example from Android Official Developer site. http://developer.android.com/training/basics/fragments/fragment-ui.html
This is the MainActivity.java's onCreate():
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.news_articles);
// Check whether the activity is using the layout version with
// the fragment_container FrameLayout. If so, we must add the first fragment
if (findViewById(R.id.fragment_container) != null) {
// However, if we're being restored from a previous state,
// then we don't need to do anything and should return or else
// we could end up with overlapping fragments.
if (savedInstanceState != null) {
return;
}
// Create an instance of ExampleFragment
HeadlinesFragment fragment = new HeadlinesFragment();
// In case this activity was started with special instructions from an Intent,
// pass the Intent's extras to the fragment as arguments
//fragment.setArguments(getIntent().getExtras());
Bundle args= new Bundle();
args.putString("category", "clothes");
args.putString("item", "shirts");
fragment.setArguments(args);
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.replace(R.id.fragment_container, fragment).commit();
}
}
And HeadlinesFragment.java's onCreate():
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// We need to use a different list item layout for devices older than Honeycomb
int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1;
Bundle args = getArguments();
if (args == null) {
Toast.makeText(getActivity(), "arguments is null " , Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getActivity(), "text " + args , Toast.LENGTH_LONG).show();
}
// Create an array adapter for the list view, using the Ipsum headlines array
setListAdapter(new ArrayAdapter<String>(getActivity(), layout, Ipsum.Headlines));
}
I've read several QA here, like this one Fragment getArguments() returns null, and many other that related to setArguments() and getArguments(), but still I'm stuck.
And I've moved the Bundle and Toast code to onAttach() and to onCreateView() with no avail. What wrong with the my code? I think I'm missing something, but dunno what is it.
Please Help! Thanks.
Edit:
I'll state my intention more clearly. In FragmentBasic that I downloaded, there's MainActivity.java, HeadlinesFragment.java, and ArticlesFragment.java. The 'communication' from MainActivity.java to ArticlesFragment.java is not the problem here. What I want is to send data from MainActivity.java to HeadlinesFragment.java. Their connection's like this:
--------------------------------------
| MainActivity <-> HeadlinesFragment |
| | |
| |>> ArticlesFragment |
--------------------------------------
And HeadlinesFragment is running at Runtime.
*These code works, when using Android gadget with < 600px width. But doesn't work when using on tablet ( >= 600px), As proved by #Tesla1984 below. But what I want is same result either on gadget < 600px and on gadget > 600px.

#tonny
I've download the FragmentBasics.zip. I only change the argument name. Here is the code and result pic.
MainActivity
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.news_articles);
// Check whether the activity is using the layout version with
// the fragment_container FrameLayout. If so, we must add the first fragment
if (findViewById(R.id.fragment_container) != null) {
// However, if we're being restored from a previous state,
// then we don't need to do anything and should return or else
// we could end up with overlapping fragments.
if (savedInstanceState != null) {
return;
}
// Create an instance of ExampleFragment
HeadlinesFragment fragment = new HeadlinesFragment();
// In case this activity was started with special instructions from an Intent,
// pass the Intent's extras to the fragment as arguments
// firstFragment.setArguments(getIntent().getExtras());
//test
Bundle args= new Bundle();
args.putString("category", "clothes");
args.putString("item", "shirts");
fragment.setArguments(args);
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.replace(R.id.fragment_container, fragment).commit();
}
}
HeadlinesFragment
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// We need to use a different list item layout for devices older than Honeycomb
int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1;
Bundle args = getArguments();
if (args == null) {
Toast.makeText(getActivity(), "arguments is null " , Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getActivity(), "text " + args , Toast.LENGTH_LONG).show();
}
// Create an array adapter for the list view, using the Ipsum headlines array
setListAdapter(new ArrayAdapter<String>(getActivity(), layout, Ipsum.Headlines));
}
here is the result

I had the same problem, but solved it :)
My problem was that I had the <fragment android:name=""> element in the Activity's XML layout. Therefore the onCreate() of the Fragment was called before the calls in Java code, thus not setting the arguments.
I removed the <fragment> element from my XML layout and it worked!

I've solved it. Looks like the only way to send data from MainActivity.java to HeadlinesFragment.java is from callbacks (If anybody else know other ways, please contribute, then we have some other ways beside this one, helping others with this kind of problem).
The main code from is MainActivity.java's function public Bundle getBundle() {}, then set the interface section on HeadlinesFragment.java, and add public Bundle getBundle();, and last, call it from HeadlinesFragment.java's onCreate.
What confuse me is fragment.setArguments(getIntent().getExtras()); on MainActivity.java's onCreate. They put that code there, and I believing it will works cause it's from Android Official Developer Guide and API http://developer.android.com/training/basics/fragments/fragment-ui.html, but it didn't work (now I believe that piece of code won't do anything). So, anyone who read the tutorial or sample from there, take it with a grain of salt!
Codes below, so everyone can understand it.
MainActivity.java:
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.fragments;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.widget.Toast;
public class MainActivity extends FragmentActivity
implements HeadlinesFragment.OnHeadlineSelectedListener {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.news_articles);
// Check whether the activity is using the layout version with
// the fragment_container FrameLayout. If so, we must add the first fragment
if (findViewById(R.id.fragment_container) != null) {
// However, if we're being restored from a previous state,
// then we don't need to do anything and should return or else
// we could end up with overlapping fragments.
if (savedInstanceState != null) {
return;
}
Toast.makeText(getApplicationContext(), "activity", Toast.LENGTH_LONG).show();
// Create an instance of ExampleFragment
HeadlinesFragment fragment = new HeadlinesFragment();
// In case this activity was started with special instructions from an Intent,
// pass the Intent's extras to the fragment as arguments
fragment.setArguments(getIntent().getExtras());
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.replace(R.id.fragment_container, fragment).commit();
}
}
public void onArticleSelected(int position) {
// The user selected the headline of an article from the HeadlinesFragment
// Capture the article fragment from the activity layout
ArticleFragment articleFrag = (ArticleFragment)
getSupportFragmentManager().findFragmentById(R.id.article_fragment);
if (articleFrag != null) {
// If article frag is available, we're in two-pane layout...
// Call a method in the ArticleFragment to update its content
articleFrag.updateArticleView(position);
} else {
// If the frag is not available, we're in the one-pane layout and must swap frags...
// Create fragment and give it an argument for the selected article
ArticleFragment newFragment = new ArticleFragment();
Bundle args = new Bundle();
args.putInt(ArticleFragment.ARG_POSITION, position);
newFragment.setArguments(args);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack so the user can navigate back
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
}
public Bundle getBundle() {
Bundle args = new Bundle();
args.putString("category", "cloths");
args.putString("item", "shirts");
return args;
}
}
HeadlinesFragment.java:
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.fragments;
import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class HeadlinesFragment extends ListFragment {
OnHeadlineSelectedListener mCallback;
// The container Activity must implement this interface so the frag can deliver messages
public interface OnHeadlineSelectedListener {
/** Called by HeadlinesFragment when a list item is selected */
public void onArticleSelected(int position);
public Bundle getBundle();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle bundle = mCallback.getBundle();
Toast.makeText(getActivity(), "headline fragment " + bundle, Toast.LENGTH_LONG).show();
// We need to use a different list item layout for devices older than Honeycomb
int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1;
// Create an array adapter for the list view, using the Ipsum headlines array
setListAdapter(new ArrayAdapter<String>(getActivity(), layout, Ipsum.Headlines));
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle
savedInstanceState) {
return super.onCreateView(inflater, container, savedInstanceState);
}
#Override
public void onStart() {
super.onStart();
// When in two-pane layout, set the listview to highlight the selected list item
// (We do this during onStart because at the point the listview is available.)
if (getFragmentManager().findFragmentById(R.id.article_fragment) != null) {
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception.
try {
mCallback = (OnHeadlineSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnHeadlineSelectedListener");
}
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
// Notify the parent activity of selected item
mCallback.onArticleSelected(position);
// Set the item as checked to be highlighted when in two-pane layout
getListView().setItemChecked(position, true);
}
}

It looks like you are inserting a key and value pair into your bundle. You probably need to reference the key value as in getArguments().getString(category);
According to the docs for putString: Inserts a String value into the mapping of this Bundle, replacing any existing value for the given key. Either key or value may be null.
Parameters
key a String, or null
value a String, or null