Develop Reference

Content is not cleared when back button is pressed

I have two screens.
Screen 1:
It has two edit text fields. And a button.When I press button, it loads, screen 2.
Screen 2:
It has only dummy static text.
Now, when I enter some field and click on button, it loads screen 2. This is desired. However, when I press back button, I should have the edit text fields cleared as it starts calling lifecycle methods from onCreateView.
But, what I found is, it has edit text content lying over there only. It did not clear the text. Debugging the code, made me realize that, putting the break point on the first line of onCreateView, gives the values as entered last time. After that, onCreateView execution, it is initialized with "" and then in resume, it is replaced with the last entered value.
I want to know that reason.
Activity:
package com.meditab.testproject;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity implements
BlankFragment.ButtonClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Creating an object of the Fragment Main Class.
BlankFragment blankFragment = new BlankFragment();
// Fragment transaction to replace the fragment.
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frmLayout, blankFragment, "Fragment");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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 onButtonClicked() {
Fragment fragment = new MainActivityFragment();
// Fragment transaction to replace the fragment.
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frmLayout, fragment, "Fragment");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
}
Fragment A:
package com.meditab.testproject;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
/**
* A simple {#link Fragment} subclass.
* Activities that contain this fragment must implement the
* Use the {#link FragmentA#newInstance} factory method to
* create an instance of this fragment.
*/
public class FragmentA extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private ButtonClickListener buttonClickListener;
public FragmentA() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment FragmentA.
*/
// TODO: Rename and change types and number of parameters
public static FragmentA newInstance(String param1, String param2) {
FragmentA fragment = new FragmentA();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_a, container, false);
Button btnClick = (Button) view.findViewById(R.id.btnClick);
btnClick.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
buttonClickListener.onButtonClicked();
}
});
return view;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
buttonClickListener = (ButtonClickListener) activity;
}
#Override
public void onDetach() {
super.onDetach();
}
public interface ButtonClickListener {
void onButtonClicked();
}
}
Fragment B:
package com.meditab.testproject;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentB extends Fragment {
public FragmentB() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_b, container, false);
}
}

that is the default behavior.
before onDrestroyView the view hierarchy state is saved by the fragment manager.
when going back the fragment manager restores that state, and that includes the text that was in the edit text.
you can override public void onViewStateRestored (Bundle savedInstanceState) to know when the state have been restored. Also note from the docs:
This is called after onActivityCreated(Bundle) and before onStart().
so, if you really need to clean the state on can do it during onStart for example. But remember that in general that is a bad user experience.

Android save the user input in a several fragments

I want to save the user input of several fragments, i try with the method onSaveInstanceState to save the state and the method onActivityCreated to restore the data, my source is:
package com.example.recepcionauto.app;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
/**
* A simple {#link android.support.v4.app.Fragment} subclass.
*
*/
public class Cliente extends Fragment {
private EditText txtRut;
String rut = null;
public Cliente() { }
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_cliente, container, false);
}
#Override
public void onActivityCreated(Bundle savedState) {
super.onActivityCreated(savedState);
if (savedState != null) {
// Restore last state for checked position.
rut = savedState.getString("rut");
txtRut = (EditText) getActivity().findViewById(R.id.txtRut);
txtRut.setText(rut);
Log.v("Log", "Recuperando del Bundle");
}
}
#Override
public void onSaveInstanceState(Bundle outState) {
outState.putString("rut", rut);
super.onSaveInstanceState(outState);
Log.v("Log", "Guardando en el Bundle");
}
#Override
public void onPause( ) {
Bundle outState = new Bundle( );
outState.putString("rut", rut);
super.onPause();
Log.v("Log", "Se ejecuto onPause( )");
}
}
this is my activity, is a view with listview and fragmentlayout
package com.autocastillo.recepcionauto.app;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class Principal extends ActionBarActivity {
private ListView lvMenu;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lvMenu = (ListView) findViewById(R.id.lvMenu);
List<String> lmenu = new ArrayList<String>();
lmenu.add("Cliente");
lmenu.add("Vehiculo");
lmenu.add("Conductor");
lmenu.add("Accesorios");
lmenu.add("Resumen");
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
Fragment startFragment = new Cliente( );
transaction.add(R.id.myFragment,startFragment);
transaction.commit();
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,lmenu );
lvMenu.setAdapter(arrayAdapter);
lvMenu.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//Toast.makeText(Principal.this, "You Clicked at " + i, Toast.LENGTH_SHORT).show();
Fragment newFragment=null;
switch (i){
case 0:{
//Toast.makeText(Principal.this, "Cliente " + i, Toast.LENGTH_SHORT).show();
newFragment = new Cliente( );
break;
}
case 1:{
newFragment = new Vehiculo( );
break;
}
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.myFragment,newFragment);
transaction.addToBackStack(null);
transaction.commit();
Log.v("Prueba", "llamo a itemclick");
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onSaveInstanceState(Bundle outState) {
Log.v("Log", "Guardando en el Bundle");
}
#Override
protected void onRestoreInstanceState(Bundle inState) {
}
}
What is wrong?, the onSaveInstanceState not work, i try with putSerialize and nothing, please i appreciate your cooperation

If what you want to save is the Fragment state as is, take a look at this other answer, which is more an explanation than an example. You should be using the putFragment and getFragment methods from your getSupportFragmentManager() instance.
I recognize I've been a little late using these two bad boys on my own, but they're quite useful. Let me give you a hint on where to add them:
putFragment
Inside your Principal activity, add this directly in your onSaveInstanceState method. One call per fragment you want to save:
public void onSaveInstanceState(Bundle outState) {
Cliente fragment = getSupportFragmentManager().findFragmentById(R.id.myFragment);
getSupportFragmentManager().putFragment(outState, "cliente", fragment);
}
getFragment
You can (and should, actually) use getFragment inside the onCreate. Use the already passed savedInstanceState variable, and slightly change the way you init the fragment:
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
Fragment startFragment = null;
if(savedInstanceState == null) { // first open
startFragment = new Cliente( );
} else { // rotation, change where the fragment was already there
startFragment = fm.getFragment(savedInstanceState, "cliente");
}
transaction.add(R.id.myFragment,startFragment);
transaction.commit();

Android : refresh fragment with dynamic list using ViewPager and ActionbarTab

I'm quite new to Android. I'm stuck with this issue for a few days now.
I'm using the new google's Template of Action bar Tab with swipe (ViewPager).
Inside each fragment, I want to display a dynamic list of cards (with cardslib : https://github.com/gabrielemariotti/cardslib). The data for the cards come from an asyncTask which is fetching data from an url.
This is my problem : When I launch the app, the first View is display, but the ViewPager prepare the view for the second page, so the async task for the second screen is launch too. And the cards of the second screen are added to the first one.
Then if i swipe to the second screen, nothing is displayed, and the async task for the third screen is launch. So if swipe to the thrid screen, nothing... And then if i switch again to the second screen, the cards with data of the first screen are displayed... A real mess !
I think I have a probleme with the onCreate, onCreateView, or something like that. Maybe the code is sometimes not at the right place.. I don't know. I tried a lot of small modofication, but nothing worked. (but it worked like this with just action bar tab and without the ViewPager).
Thanks
Here is my code :
import java.util.Locale;
import android.app.ActionBar;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v13.app.FragmentPagerAdapter;
import android.support.v13.app.FragmentStatePagerAdapter;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
/**
* The {#link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a {#link FragmentPagerAdapter}
* derivative, which will keep every loaded fragment in memory. If this
* becomes too memory intensive, it may be best to switch to a
* {#link android.support.v13.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {#link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mSectionsPagerAdapter.notifyDataSetChanged();
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
//mSectionsPagerAdapter.notifyDataSetChanged();
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter. Also specify this Activity object, which implements
// the TabListener interface, as the callback (listener) for when
// this tab is selected.
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
mSectionsPagerAdapter.notifyDataSetChanged();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onTabSelected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
if(tab.getPosition() != mViewPager.getCurrentItem()) {
mViewPager.setCurrentItem(tab.getPosition());
}
// mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
mSectionsPagerAdapter.notifyDataSetChanged();
}
#Override
public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
mSectionsPagerAdapter.notifyDataSetChanged();
}
/**
* A {#link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentStatePagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
return PlaceholderFragment.newInstance(position + 1);
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
}
And here is the Fragment
import it.gmariotti.cardslib.library.internal.Card;
import it.gmariotti.cardslib.library.internal.CardArrayAdapter;
import it.gmariotti.cardslib.library.internal.CardHeader;
import it.gmariotti.cardslib.library.view.CardListView;
import java.util.ArrayList;
import java.util.List;
import android.app.Fragment;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import com.example.webanajones.asyncTask.GetItemTask;
import com.example.webanajones.asyncTask.IResultsListener;
import com.example.webanajones.asyncTaskResponse.ItemJsonResponse;
import com.example.webanajones.asyncTaskResponse.ItemJsonResponse.Item;
/**
* A placeholder fragment containing a simple view.
*/
public class PlaceholderFragment extends Fragment implements
IResultsListener {
/**
* The fragment argument representing the section number for this
* fragment.
*/
static final String ARG_SECTION_NUMBER = "section_number";
public static int limit = 0;
IResultsListener listener = this;
ArrayList<Card> cards = new ArrayList<Card>();
CardArrayAdapter mCardArrayAdapter;
int flag = 0;
boolean loadMore = true;
CardListView listView;
private int idx;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Bundle data = getArguments();
// idx = data.getInt("idx") +1;
limit = 0;
flag = 0;
loadMore = true;
List<String> params = new ArrayList();
params.add(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
params.add(String.valueOf(limit));
GetItemTask getItemTask = new GetItemTask();
getItemTask.setOnResultsListener(listener);
getItemTask.execute(params);
}
/**
* 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() {
}
#SuppressWarnings("unchecked")
#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 onGetItemTaskSucceeded(ItemJsonResponse itemJsonResponse) {
if (mCardArrayAdapter != null) {
mCardArrayAdapter.notifyDataSetChanged();
}
if (itemJsonResponse.getSuccess() != 0) {
loadMore = true;
final Item[] itemTable = itemJsonResponse.getItemArray();
for (int itemIndex = 0; itemIndex < itemTable.length; itemIndex++) {
if (itemTable[itemIndex].getTypeId() == 2) { // 2 = type GIF
final int index = itemIndex;
Card gifCard = new CardGif(getActivity()){
#Override
public void setupInnerViewElements(ViewGroup parent, View view) {
DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
int width = (int) (metrics.widthPixels * 0.97);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(width, LinearLayout.LayoutParams.WRAP_CONTENT);
params.bottomMargin = 30;
LinearLayout LinearLayout = (LinearLayout) parent.findViewById(R.id.inner_frame);
GIFWebView gifView = new GIFWebView (getActivity(), itemTable[index].getObjectUrl());
LinearLayout.addView(gifView);
}
};
CardHeader header = new CardHeader(getActivity());
header.setTitle(itemTable[itemIndex].getTitle());
cards.add(gifCard);
}
if (itemTable[itemIndex].getTypeId() == 1) { // 1 = image
Card card = new Card(getActivity());
CardHeader header = new CardHeader(getActivity());
header.setTitle(itemTable[itemIndex].getTitle());
card.addCardHeader(header);
MyThumbnail thumb = new MyThumbnail(getActivity(), itemTable[itemIndex].getObjectUrl());
thumb.setExternalUsage(true);
card.addCardThumbnail(thumb);
final int index = itemIndex;
card.addPartialOnClickListener(Card.CLICK_LISTENER_THUMBNAIL_VIEW, new Card.OnCardClickListener() {
#Override
public void onClick(Card card, View view) {
Intent intent = new Intent(getActivity(), FullscreenActivity.class);
intent.putExtra("imageUrl", itemTable[index].getObjectUrl());
startActivity(intent);
}
});
cards.add(card);
}
}
if (flag == 0) {
mCardArrayAdapter = new CardArrayAdapter(getActivity(), cards);
listView = (CardListView) getActivity().findViewById(
R.id.carddemo_list);
listView.setAdapter(mCardArrayAdapter);
flag = 1;
}
}
else {
loadMore = false;
}
loadMoreCards(mCardArrayAdapter, loadMore);
}
public void loadMoreCards(CardArrayAdapter mCardArrayAdapter, boolean loadMore) {
if (listView != null) {
mCardArrayAdapter.notifyDataSetChanged();
if (loadMore) {
listView.setOnScrollListener(new EndlessScrollListener() {
#Override
public void onLoadMore(int page, int totalItemsCount) {
limit += 5;
List<String> params = new ArrayList();
params.add("1");
params.add(String.valueOf(limit));
GetItemTask getItemTask = new GetItemTask();
getItemTask.setOnResultsListener(listener);
getItemTask.execute(params);
}
});
}
}
}
//fin placeholderfrag
#Override
public void onGetImageTaskSucceeded(Bitmap bitmap) {
// TODO Auto-generated method stub
}
}

Thanks #GabrieleMariotti, it helped ! In fact I already tried to use different classes for the different fragments, but I forget to give diferent IDs to my cardsLists. It solved the problem. Btw, good job for your lib, it is awesome.
So for the next one : create differents classes for all your differents fragments. They have to use differents layout, and the cardsList have to use differents ID.

Issue with Fragment on Android Developer Page

I was reading the documentation on Fragment on the Developer site. I created a new project targeting api 8:android 2.2. I have the Android Support Library install, and I added the android support library to the project. I started implementing the helper method showDetails, and I get the red squiggly line saying that "a_item could not be resolved". I don't remember the instruction saying create an a_item variable or add a layout with a_item id.
In addition, in the detail activity, I am getting an error message too. (getFragmentManager().beginTransaction().add(android.R.id.content, details).commit();) It says "The method add(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, DetailsFragment)". Did I miss something in the instructions?
Here are my sample codes:
package com.example.fragmentlayout;
import android.app.Activity;
import android.app.Fragment;
import android.content.res.Configuration;
import android.os.Bundle;
public class DetailsActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(getResources().getConfiguration().ORIENTATION_LANDSCAPE == Configuration.ORIENTATION_LANDSCAPE )
{
finish();
return;
}
if(savedInstanceState == null)
{
DetailsFragment details = new DetailsFragment();
details.setArguments(getIntent().getExtras());
getFragmentManager().beginTransaction().add(android.R.id.content, details).commit();
}
}
}
Here is the Titles Fragment:
package com.example.fragmentlayout;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.ListFragment;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class TitlesFragment extends ListFragment {
boolean mDualPane;
int mCurCheckPosition =0;
String[] titles = {"Title 1", "Title 2", "Title 3"};
String[] Details = {"Details for one", "Details for two", "Details for Three"};
#SuppressLint("InlinedApi")
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_activated_1, titles));
View detailsFrame = getActivity().findViewById(R.id.fragment2);
mDualPane = detailsFrame != null && detailsFrame.getVisibility() == View.VISIBLE;
if(savedInstanceState != null)
{
mCurCheckPosition = savedInstanceState.getInt("curChoise", 0);
}
if(mDualPane)
{
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
showDetails(mCurCheckPosition);
}
}
private void showDetails(int index) {
mCurCheckPosition = index;
if(mDualPane)
{
getListView().setItemChecked(index, true);
DetailsFragment details = (DetailsFragment) getFragmentManager().findFragmentById(R.id.fragment2);
if(details == null || details.getShownIndex() != index)
{
details = DetailsFragment.newInstance(index);
FragmentTransaction ft = getFragmentManager().beginTransaction();
if(index ==0)
{
ft.replace(R.id.fragment2, details);
} else
{
ft.replace(R.id.a_item, details);
}
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
} else
{
Intent intent = new Intent();
intent.setClass(getActivity(), DetailsActivity.class);
intent.putExtra("index", index);
startActivity(intent);
}
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
showDetails(position);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("curChoice", mCurCheckPosition);
}
}
Here is the detailsFragment:
package com.example.fragmentlayout;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ScrollView;
import android.widget.TextView;
public class DetailsFragment extends Fragment {
String[] Details = {"Details for one", "Details for two", "Details for Three"};
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(container == null)
{
return null;
}
ScrollView scroller = new ScrollView(getActivity());
TextView text = new TextView(getActivity());
int padding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,4, getActivity().getResources().getDisplayMetrics());
text.setPadding(padding, padding, padding, padding);
scroller.addView(text);
text.setText(Details[getShownIndex()]);
return scroller;
// return super.onCreateView(inflater, container, savedInstanceState);
}
public static DetailsFragment newInstance(int index)
{
DetailsFragment f = new DetailsFragment();
Bundle args = new Bundle();
args.putInt("index", index);
f.setArguments(args);
return f;
}
public int getShownIndex()
{
return getArguments().getInt("index", 0);
}
}
Here is the land and portrait layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<fragment
android:id="#+id/fragment1"
android:name="com.example.fragmentlayout.TitlesFragment"
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="1" />
<fragment
android:id="#+id/fragment2"
android:name="com.example.fragmentlayout.DetailsFragment"
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="1"/>
</LinearLayout>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<fragment
android:id="#+id/fragment1"
android:name="com.example.fragmentlayout.TitlesFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>

Perhaps, it's a mistake. The answer is here
https://code.google.com/p/android/issues/detail?id=54837
The author of linked message advises to replace code fragment
if (index == 0) {
ft.replace(R.id.details, details);
} else {
ft.replace(R.id.a_item, details);
}
with code fragment
if (index == 0) {
ft.add(R.id.details, details);
} else {
ft.replace(R.id.details, details);
}
or maybe just
ft.replace(R.id.details, details);

Your DetailsActivity should extend FragmentActivity
You should use getSupportFragmentManager()
If you nest fragments into other fragments consider using getChildFragmentManager()
(ok, i didn't look through all of the code, so not sure if 3 is applicable)

You need to use getSupportFragmentManager instead of getFragmentManager, because you are using support fragments.
The R.id.a_item references the id of the layout in your layout file. Instead of android:id="#+id/fragment1", make it android:id="#+id/a_item"

i want to add icon in listfragmnet (headlines fragment) in it

i m developing tablet app using fragment,. i want add icon in list fragmnet .i tried from the listview but not done.help me out....
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.support.v4.app.ListFragment;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Toast;
public class HeadlinesFragment extends ListFragment {
OnHeadlineSelectedListener mCallback;
// The container Activity must implement this interface so the fragment can deliver messages
public interface OnHeadlineSelectedListener {
/** Called by HeadlinesFragment when a list item is selected */
public void onArticleSelected(int position);
}
static String[] Headlines = {
"Article One",
"Article Two",
"Article 3"
};
int[] flags = new int[]{
R.drawable.ic_11,
R.drawable.ic_12,
R.drawable.ic_13
};
String[] currency = new String[]{
"Indian Rupee",
"Pakistani Rupee",
"Sri Lankan Rupee",
};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
// Each row in the list stores country name, currency and flag
List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>();
for(int i=0;i<10;i++){
HashMap<String, String> hm = new HashMap<String,String>();
hm.put("txt", "Headlines: " + Headlines[i]);
hm.put("cur","Currency : " + currency[i]);
hm.put("flag", Integer.toString(flags[i]) );
aList.add(hm);
}
// Keys used in Hashmap
String[] from = { "flag","txt","cur" };
// Ids of views in listview_layout
int[] to = { R.id.flag,R.id.txt,R.id.cur};
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), aList, R.layout.list, from, to);
// Getting a reference to listview of main.xml layout file
ListView listView = ( ListView ) findViewById(R.id.listview);
// Setting the adapter to the listView
listView.setAdapter(adapter);
}
#Override
public void onCreateOptionsMenu(Menu menu,MenuInflater inflater) {
inflater.inflate(R.menu.mainmenu, menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_refresh:
//Toast.makeText(this, "Action refresh selected", Toast.LENGTH_SHORT)
// .show();
return true;
case R.id.action_settings:
// Toast.makeText(this, "Action Settings selected", Toast.LENGTH_SHORT)
// .show();
return true;
default:
break;
}
return true;
}
// Other methods which this class implements
#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);
}
ArticalFragmnet.java
enter code here
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class ArticleFragment extends Fragment {
final static String ARG_POSITION = "position";
int mCurrentPosition = -1;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// If activity recreated (such as from screen rotate), restore
// the previous article selection set by onSaveInstanceState().
// This is primarily necessary when in the two-pane layout.
if (savedInstanceState != null) {
mCurrentPosition = savedInstanceState.getInt(ARG_POSITION);
}
// Inflate the layout for this fragment
return inflater.inflate(R.layout.article_view, container, false);
}
#Override
public void onStart() {
super.onStart();
// During startup, check if there are arguments passed to the fragment.
// onStart is a good place to do this because the layout has already been
// applied to the fragment at this point so we can safely call the method
// below that sets the article text.
Bundle args = getArguments();
if (args != null) {
// Set article based on argument passed in
updateArticleView(args.getInt(ARG_POSITION));
} else if (mCurrentPosition != -1) {
// Set article based on saved instance state defined during onCreateView
updateArticleView(mCurrentPosition);
}
}
public void updateArticleView(int position) {
TextView article = (TextView) getActivity().findViewById(R.id.article);
article.setText(Ipsum.Articles[position]);
mCurrentPosition = position;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// Save the current article selection in case we need to recreate the fragment
outState.putInt(ARG_POSITION, mCurrentPosition);
}
}
MainActivity.java
enter code hereimport android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
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;
}
// Create an instance of ExampleFragment
HeadlinesFragment firstFragment = 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());
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container, firstFragment).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
// 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();
}
}
}