I have a fragment with a ViewPager inside it. In the ViewPager I have 4 content screens so swipe around in. The content has a few TextView components and I'm trying to access them from the first fragment, however when I go to use setText or similar I get a null pointer exception. Ive checked and the id for the TextView is valid, and I've done a clean build.
Here is a snippet of my relevant code:
private TextView textViewOne;
private PagerAdapter mPagerAdapter;
private ViewPager pager;
View rootView;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_layout_viewpager, container, false);
InitializePaging();
textViewOne = (TextView) rootView.findViewById(R.id.create_name);
//would return null if I did this:
textViewOne.setText("test");
return rootView;
}
private void InitializePaging() {
mPagerAdapter = new ViewPagerAdapter(getContext(), getChildFragmentManager(),
Arrays.asList(PageOne.class, PageTwo.class, PageThree.class, PageFour.class));
pager = (ViewPager) rootView.findViewById(R.id.content_pager);
pager.setAdapter(mPagerAdapter);
}
The PageOne class:
public class PageOne extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(container == null) {
return null;
}
return (LinearLayout) inflater.inflate(R.layout.fragment_page_one, container, false);
}
}
This is the fragment_layout_viewpager xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="#+id/content_pager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
You are inflating fragment_layout_viewpager, so the create_name should exist in that layout, otherwise it will throw a null pointer.
Create an interface with 1 abstract method. Let the Fragment implement the interface and call the callback method from Activity.In the below example, I try to pass value on click of button from MainActivity to ThirdFragment.
public interface FragmentCommunicator {
public void passDataToFragment(String someValue);
}
public class MainActivity extends FragmentActivity {
FragmentCommunicator fragmentCommunicator;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button btn= (Button)findViewById(R.id.button) ;
btnsetOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
randomvalue= getRansomString();
if(fragmentCommunicator!=null)
fragmentCommunicator.passDataToFragment(randomvalue);
}
});
ViewPager pager = (ViewPager) findViewById(R.id.viewPager);
pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
}
private class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return FirstFragment.newInstance("FirstFragment, Instance 1");
case 1: return ThirdFragment.newInstance("ThirdFragment, Instance 1");
default: return FirstFragment.newInstance("FirstFragment,Instance 1");
}
}
#Override
public int getCount() {
return 2;
}
}
public static class FirstFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.first_frag, container, false);
TextView tv = (TextView) v.findViewById(R.id.tvFragFirst);
tv.setText(getArguments().getString("msg"));
return v;
}
public static FirstFragment newInstance(String text) {
Log.e("FirstFragment","newInstance called");
FirstFragment f = new FirstFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
}
public class ThirdFragment extends Fragment implements FragmentCommunicator {
TextView tv;
String value="";
public FragmentCommunicator fragmentCommunicator;
#Override
public void passDataToFragment(String someValue) {
this.value = someValue;
tv.setText(value);
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
((MainActivity)activity).fragmentCommunicator = this;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement FragmentCommunicator");
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.first_frag, container, false);
value=getArguments().getString("msg");
tv = (TextView) v.findViewById(R.id.tvFragFirst);
tv.setText(value);
return v;
}
public static ThirdFragment newInstance(String text) {
ThirdFragment f = new ThirdFragment();
Bundle b = new Bundle();
b.putString("msg",text);
f.setArguments(b);
return f;
}
}
Related
I'm a beginner who learning Android basic course
I want to make 6 fragments that have same structure (only title, image, texts will be different) by using single fragment.
I tried this code but I can see only one fragment.
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.fragment_container);
MoviePagerAdapter adapter = new MoviePagerAdapter(getSupportFragmentManager());
mainfragment = new MainFragment();
adapter.addItem(mainfragment);
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(6);
}
ViewPager Adapter (in MainActivity)
class MoviePagerAdapter extends FragmentStatePagerAdapter {
public ArrayList<Fragment> items = new ArrayList<Fragment>();
#Override
public Fragment getItem(int position) {
return items.get(position);
}
public MoviePagerAdapter(#NonNull FragmentManager fm) {
super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
}
public void addItem(Fragment item) {
items.add(item);
}
#Override
public int getCount() {
return items.size();
}
}
MainFragment.java
public class MainFragment extends androidx.fragment.app.Fragment {
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.main_frargment, container,
false);
//...
'i want to make 6fragments with datas below '
movieData = new MovieData("title1", "rate1", "grade1");
addData(movieData);
movieData = new MovieData("title2", "rate2", "grade2");
addData(movieData);
movieData = new MovieData("title3", "rate3", "grade3");
addData(movieData);
movieData = new MovieData("title4", "rate4", "grade4");
addData(movieData);
movieData = new MovieData("title5", "rate5", "grade5");
addData(movieData);
movieData = new MovieData("title6", "rate6", "grade6");
addData(movieData);
return rootView;
}
public void addData(MovieData movieData){
Bundle bundle = new Bundle();
bundle.putParcelable("data", movieData);
MainFragment mainFragment = new MainFragment();
mainFragment.setArguments(bundle);
title.setText(movieData.title);
reservation_rate.setText(movieData.getReservation_rate());
grade.setText(movieData.getGrade());
image.setImageResource(R.drawable.image6);
}
}
change your code like this:
public class MainActivity extends AppCompatActivity {
private MoviePagerAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.fragment_container);
adapter = new MoviePagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(6);
for(int i =0;i<6;i++){
createFrag(i);
}
}
}
private void createFrag(int number) {
MainFragment fragment = new MainFragment();
Bundle args = new Bundle();
args.putInt("NUMBER",number);
fragment.setArguments(args);
adapter.addItem(fragment);
adapter.notifyDataSetChanged();
}
class MoviePagerAdapter extends FragmentStatePagerAdapter {
public ArrayList<Fragment> items = new ArrayList<Fragment>();
#Override
public Fragment getItem(int position) {
return items.get(position);
}
public MoviePagerAdapter(#NonNull FragmentManager fm) {
super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
}
public void addItem(Fragment item) {
items.add(item);
}
#Override
public int getCount() {
return items.size();
}
}
and change your Fragment like this:
public class MainFragment extends androidx.fragment.app.Fragment {
//1st
private int number;
#Nullable
//this is variant 1 - with static Movie data
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable
ViewGroup container, #Nullable Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.main_frargment,
container,
false);
//...
//2d
assert getArguments() != null;
number = getArguments().getInt("NUMBER");
switch (number) {
case 0:
MmovieData movieData1 = new MovieData("title1", "rate1",
"grade1");
addData(movieData1);
break;
case 1:
MmovieData movieData2 = new MovieData("title2", "rate2",
"grade2");
addData(movieData2);
break;
//...
}
return rootView;
}
public void addData(MovieData movieData){
title.setText(movieData.title);
reservation_rate.setText(movieData.getReservation_rate());
grade.setText(movieData.getGrade());
image.setImageResource(R.drawable.image6);
}
}
and this is variant 2 ( with dynamic data and listener)
public class MainFragment extends androidx.fragment.app.Fragment {
//1st
private int number;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable
ViewGroup container, #Nullable Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.main_frargment,
container,
false);
//...
//2d
assert getArguments() != null;
number = getArguments().getInt("NUMBER");
return rootView;
}
//some method of listener changed
public void dataChanged(MovieData movieData, int position){
if(number==position){
title.setText(movieData.title);
reservation_rate.setText(movieData.getReservation_rate());
grade.setText(movieData.getGrade());
image.setImageResource(R.drawable.image6);
}
}
EDIT:
I'm new in android and i try to use fragments in my app. I try to use a fragment function in my activity but i got a null pointer exception..
Fragment:
public class VideoviewFragment extends Fragment {
private View card;
public static VideoviewFragment create() {
return new VideoviewFragment();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_videoview, container, false);
card = (View) view.findViewById(R.id.card_video);
return view;
}
public void setalphacard(float value){
card.setAlpha(value);
}
}
In main activity i want to do that for example (i simplified my code):
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Viewpager
final SmartFragmentStatePagerAdapter adapterViewPager;
final ViewPager viewPager = (ViewPager) findViewById(R.id.am_view_pager);
adapterViewPager = new MainPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapterViewPager);
final VideoviewFragment videoviewFragment = (VideoviewFragment) adapterViewPager.getRegisteredFragment(2);
videoviewFragment.setalphacard(0.3f);
}
}
Main pager adapter:
public class MainPagerAdapter extends SmartFragmentStatePagerAdapter {
public MainPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
return CameraFragment.create();
case 1:
return OptionFragment.create();
case 2:
return VideoviewFragment.create();
}
return null;
}
#Override
public int getCount() {
return 3;
}
}
You just have to declare the View globally like this:
public class VideoviewFragment extends Fragment {
private View card;
public static VideoviewFragment create() {
return new VideoviewFragment();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_videoview, container, false);
card = (View) view.findViewById(R.id.card_video);
return view;
}
public void setalphacard(float value){
card.setAlpha(value);
}
}
Declare your View Object globally in your fragment.
I want to change the Fragment when i click the button. The fragments are in the same adapter/viewpager.
FROM THIS FRAGMENT:
public class LoginFragment extends Fragment {
TextView linkToRegister;
public static final LoginFragment newInstance()
{
LoginFragment mf = new LoginFragment();
Bundle bd = new Bundle(1);
mf.setArguments(bd);
return mf;
}
public View onCreateView(LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState )
{
View v = inflater.inflate(R.layout.fragment_login, container, false);
linkToRegister = (TextView) v.findViewById(R.id.link_to_register);
linkToRegister.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Change Fragment
}
});
return v;
}
}
TO THIS FRAGMENT:
public class RegisterFragment extends Fragment {
public static final String EXTRA_MESSAGE = "EXTRA_MESSAGE";
public static final RegisterFragment newInstance()
{
RegisterFragment mf = new RegisterFragment();
Bundle bd = new Bundle(1);
mf.setArguments(bd);
return mf;
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState )
{
View v = inflater.inflate(R.layout.fragment_register, container, false);
return v;
}
}
PagerAdapter:
public class WelcomePagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> Welcomefragments;
public WelcomePagerAdapter(FragmentManager fm, List<Fragment> Welcomefragments) {
super(fm);
this.Welcomefragments = Welcomefragments;
}
#Override
public Fragment getItem(int position) {
return this.Welcomefragments.get(position);
}
#Override
public int getCount() {
return this.Welcomefragments.size();
}
}
Activity:
public class WelcomeActivity extends AppCompatActivity {
ViewPager welcomeViewPager;
WelcomePagerAdapter welcomePagerAdapter;
List<Fragment> welcomeFragments;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);
welcomeViewPager = (ViewPager) findViewById(R.id.viewPagerWelcome);
welcomeFragments = getWelcomeFragments();
welcomePagerAdapter = new WelcomePagerAdapter(getSupportFragmentManager(), welcomeFragments);
welcomeViewPager.setAdapter(welcomePagerAdapter);
}
public List<Fragment> getWelcomeFragments() {
List<Fragment> newFragment = new ArrayList<Fragment>();
newFragment.add(LoginFragment.newInstance());
newFragment.add(RegisterFragment.newInstance());
return newFragment;
}
}
Step 1: Define a callback interface in the Fragment and hook in the Activity when the Fragment attaches to it.
public class MyFragment extends Fragment {
public interface OnInteractionListener {
void doAction(); // Can include parameters here if needed
}
private OnInteractionListener listener;
#Override
public void onAttach(Context context) {
if (context instanceof OnInteractionListener) {
listener = (OnInteractionListener) context;
} else {
throw new ClassCastException(context + "must implement " + OnInteractionListener.class.getSimpleName());
}
super.onAttach(context);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_layout, container, false);
// ...
return v;
}
}
Step 2: Make sure your Activity implements that Interface
public class MyActivity extends AppCompatActivity implements MyFragment.OnInteractionListener {
#Override
public void doAction() {
// TODO: Implement this... e.g. switch fragments
}
...
}
Step 3: Inside the Fragment, you can invoke the callback whenever you want to perform some action
if (listener != null) {
listener.doAction();
}
From MainActivity(), get the navController and then use the navigate() function:
NavController navController = Navigation.findNavController(this,R.id.nav_host_fragment);
navController.navigate(R.id.nav_grid);
In my application I want to put a ListView in the first Fragment and I want to move to a new Fragment when I clicked on an item such that each item has its own details
in my code.
I implemented it to move to another Activity, but now my manager says it must go to another Fragment instead of other activity. I'm new to the Fragment world and I don't know how to do this. The manager says that I can use the list fragment but I have not found any useful code.
This my code:
public class MainActivity extends FragmentActivity {
SectionsPagerAdapter mSectionsPagerAdapter;
static ProgressDialog pd ;
ViewPager mViewPager;
List<Fragment> fragments ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
fragments = new Vector<Fragment>();
fragments.add(Fragment.instantiate(this, FragmentOne.class.getName()));
fragments.add(Fragment.instantiate(this, FragmentTwo.class.getName()));
fragments.add(Fragment.instantiate(this, FragmentThree.class.getName()));
fragments.add(Fragment.instantiate(this, FragmentFour.class.getName()));
fragments.add(Fragment.instantiate(this, FragmentFive.class.getName()));
fragments.add(Fragment.instantiate(this, FragmentSix.class.getName()));
mSectionsPagerAdapter=new SectionsPagerAdapter(super.getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
pd = new ProgressDialog(this);
mViewPager.setAdapter(mSectionsPagerAdapter);
//
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
int _pos = position % 6;
return fragments.get(_pos);
}
#Override
public int getCount() {
// Show 3 total pages.
return 6;
}
#Override
public CharSequence getPageTitle(int position) {
final String title_section4="Section4";
final String title_section5="Section5";
final String title_section6="Section6";
final String title_section1="Section1";
final String title_section2="Section2";
final String title_section3="Section3";
Locale l = Locale.getDefault();
switch (position) {
case 0:
return title_section1.toUpperCase(l);
case 1:
return title_section2.toUpperCase(l);
case 2:
return title_section3.toUpperCase(l);
case 3:
return title_section4.toUpperCase(l);
case 4:
return title_section5.toUpperCase(l);
case 5:
return title_section6.toUpperCase(l);
}
return null;
}
}
public static class FragmentOne extends Fragment {
ArrayList< String > ar;
ArrayAdapter< String > ad ;
ListView lv ;
TextView tv;
public FragmentOne() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.one, container, false);
tv = (TextView) rootView.findViewById(R.id.mywidget);
tv.setSelected(true);
ar = new ArrayList<String>();
lv = (ListView) rootView.findViewById(R.id.listView1);
for (int i = 0 ; i< 10 ; i++){
ar.add("My Item " + String.valueOf(i));
}
ad = new ArrayAdapter<String>
(getActivity().getApplicationContext(), android.R.layout.simple_dropdown_item_1line,
ar);
lv.setAdapter(ad);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast t = Toast.makeText(getActivity(), "Message",
Toast.LENGTH_SHORT);
t.show();
Intent i = new Intent(getActivity(), tst.class);
startActivity(i);
}
});
return rootView;
}
}
public static class FragmentTwo extends Fragment {
public FragmentTwo() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.two, container, false);
return rootView;
}
}
public static class FragmentThree extends Fragment {
public FragmentThree() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.three, container, false);
return rootView;
}
}
public static class FragmentFour extends Fragment {
public FragmentFour() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.four, container, false);
return rootView;
}
}
public static class FragmentFive extends Fragment {
public FragmentFive() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.five, container, false);
return rootView;
}
}
public static class FragmentSix extends Fragment {
public FragmentSix() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.six, container, false);
return rootView;
}
}
}
You have to replace the fragment using Transaction
See here:
http://developer.android.com/guide/components/fragments.html#Example
Check the showDetails(int index) method of TitlesFragment class:
FragmentTransaction ft = getFragmentManager().beginTransaction();
if (index == 0) {
ft.replace(R.id.details, details);
} else {
ft.replace(R.id.a_item, details);
}
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
Use pager and give integer index to each fragment then use following code in itemclick
ViewPager pager;
pager.setCurrentItem(index, true);
I have to add TextViews and EditTexts in a Fragment ( Details() ) when i click in a button ( Button add ).
I was able to insert them, but when i swipe my 6 fragments and return in the first fragment this items disappear.
Can someone help me?
FragmentActivity class:
public class SubActivityTab extends FragmentActivity
{
SectionsPagerAdapter spa;
ViewPager vp;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.scrolltab_layout);
spa = new SectionsPagerAdapter(getSupportFragmentManager(), this);
vp = (ViewPager) findViewById(R.id.pager);
vp.setAdapter(spa);
}
}
FragmentPagerAdapter class:
public class SectionsPagerAdapter extends FragmentPagerAdapter
{
Context c;
public SectionsPagerAdapter(FragmentManager fm, Context c) {
super(fm);
this.c = c;
}
#Override
public Fragment getItem(int position) {
switch(position)
{
case 0:
return Details.newInstance();
...
}
return null;
}
#Override
public int getCount() {
return 6;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position)
{
case 0:
return c.getString(R.string.tab1).toUpperCase(l);
...
}
return null;
}
}
Fragment class:
public final class Details extends Fragment {
public static View layout;
public static LinearLayout ll;
public static Details newInstance()
{
return new Details();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
super.onCreateView(inflater, container, savedInstanceState);
layout = inflater.inflate(R.layout.details, container, false);
ll = (LinearLayout) layout.findViewById(R.id.linearlayout2);
Button add = (Button) layout.findViewById(R.id.button_add);
add.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
insertLine();
insertClassEditText();
insertLevel();
}});
return layout;
}
private void insertLine()
{
View temp = (View) layout.findViewById(R.id.line);
View v = new View(temp.getContext());
v.setBackgroundColor(Color.rgb(209, 209, 209));
v.setId(0);
v.setLayoutParams(temp.getLayoutParams());
ll.addView(v);
}
private void insertClassEditText()
{
TextView label_classe = (TextView) layout.findViewById(R.id.textView10);
EditText edit_classe = (EditText) layout.findViewById(R.id.editText9);
TextView new_label_classe = new TextView(label_classe.getContext());
EditText new_edit_classe = new EditText(edit_classe.getContext());
new_label_classe.setId(1);
new_edit_classe.setId(2);
new_label_classe.setText("Label");
new_label_classe.setTextAppearance(new_label_classe.getContext(), android.R.style.TextAppearance_Medium);
ll.addView(new_label_classe);
new_edit_classe.setInputType(edit_classe.getInputType());
new_edit_classe.setLayoutParams(edit_classe.getLayoutParams());
ll.addView(new_edit_classe);
}
private void insertLevel()
{
TextView label_lv = (TextView) layout.findViewById(R.id.textView11);
EditText edit_lv = (EditText) layout.findViewById(R.id.editText10);
TextView new_label_lv = new TextView(label_lv.getContext());
EditText new_edit_lv = new EditText(edit_lv.getContext());
new_label_lv.setId(3);
new_edit_lv.setId(4);
new_label_lv.setText(label_lv.getText());
new_label_lv.setTextAppearance(new_label_lv.getContext(), android.R.style.TextAppearance_Medium);
ll.addView(new_label_lv);
new_edit_lv.setInputType(edit_lv.getInputType());
new_edit_lv.setLayoutParams(edit_lv.getLayoutParams());
ll.addView(new_edit_lv);
}
}
I believe ViewPager recycles the views as you swipe and therefore when you go back, it rebuilds from onCreateView.
I would suggest setting some tags and passing to onSaveInstanceState.
private void onSaveInstanceState(Bundle b) {
if (label_classe != null) {
b.putBoolean("label_classe", true);
}
}
Then in onCreateView you take savedInstanceState, check what elements were created and re-create them.
So in Fragment:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
....
if (savedInstanceState.getBoolean("label_classe")) {
insertClassEditText();
}
....
}
And just to be sure, in Activity:
public class SubActivityTab extends FragmentActivity
{
SectionsPagerAdapter spa;
ViewPager vp;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.scrolltab_layout);
spa = new SectionsPagerAdapter(getSupportFragmentManager(), this);
vp = (ViewPager) findViewById(R.id.pager);
vp.setSaveState(true);
vp.setSaveFromParentEnabled(true);
vp.setAdapter(spa);
}
}
Try to change your onCreateView method to:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
if(layout ==null){
layout = inflater.inflate(R.layout.details, container, false); //Dont inflate every time.layout saved, data of layout,like EidtText also saved.
}
ViewParent parent = mLayout.getParent();
if(parent!=null){
((ViewGroup)parent).removeView(layout);//the view will be add to NoSaveStateFrameLayout after onCreateView,so remove self everytime
}
return layout;
}