Develop Reference

Fragment savedInstanceState not working

I have several fragments here and there's this one fragment where I want to save its state when I get back to it. I tried doing it in a testfragment where, when I click the button, the textview text will change to "test1"(The default text of the textview is "New Text"). So the textview changes the text, but when I move into another fragment and get back to it (HomeFragment), the textview is going to its default state text ("New Text"). So I think the savedInstanceState is not working because if it does, it should have "test1" when I get back to the fragment. Here's my code:
public class HomeFragment extends Fragment {
public Button button;
public TextView txt_test;
public String data_test;
public HomeFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_home, container, false);
return view;
}
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
if(savedInstanceState == null){
}
else{
data_test = savedInstanceState.getString("txt_test");
txt_test = (TextView) getActivity().findViewById(R.id.textView2);
txt_test.setText(data_test);
}
button = (Button) getActivity().findViewById(R.id.button3);
txt_test = (TextView) getActivity().findViewById(R.id.textView2);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
txt_test.setText("test1");
}
});
}
public void onSaveInstanceState(Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putString("txt_test",data_test);
}
}

public class HomeFragment extends Fragment {
Button button;
TextView txt_test;
String data_test;
public HomeFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_home, container, false);
txt_test = (TextView) view.findViewById(R.id.textView2);
button = (Button) view.findViewById(R.id.button3);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
txt_test.setText("test1");
}
});
if(savedInstanceState == null) {
// do nothing
} else {
data_test = savedInstanceState.getString("txt_test");
txt_test.setText(data_test);
}
return view;
}
#Override
public void onSaveInstanceState(Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putString("txt_test",data_test);
}
}

android - TextView won't update in UI

//This is the TextViewExample class
public class TextViewExample {
private TextView mTextViewExample;
public TextViewExample(Activity activity) {
mActivity = activity;
mTextViewExample = (TextView)mActivity.findViewById(R.id.TextViewLayout);
}
}
//This is the Fragment class
public class TextViewFragment extends Fragment {
private TextViewExample mText;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mText = new TextViewExample(getActivity());
}
}
mText is not updated in the UI! Could someone explain the correct way of displaying TextView properly from calling an activity in a fragment.
Thanks =)

You can access the Activity's TextView in the Fragment (assuming this fragment is attached to the activity) directly:
//This is the Fragment class
public class TextViewFragment extends Fragment {
private TextView mText;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// you need to inflate the xml file holding this TextView.
mText = (TextView) getActivity().findViewByid(R.id.<your-text-view-id>;
// do something with your TextView
}
}
Be sure to check for getActivity() == null to avoid NPE's.

Activity:
public class MainActivity {
private TextView mTextViewExample;
protected void onCreate(Bundle savedInstanceState) {
...
mTextViewExample = (TextView) findViewById(R.id.TextViewLayout);
}
}
public void setTextViewExampleText(String text) {
mTextViewExample.setText(text);
}
TextViewFragment
public class TextViewFragment extends Fragment {
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
((MainActivity) getActivity()).setTextViewExampleText("text");
}
}

Call method in child fragment in parent fragment from activity

In my MainActivity class I have view pager with 3 tab fragmentHome class, fragmentHot class and FragmentCategoryclass
Here is fragmentCategory class:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view;
view = inflater.inflate(R.layout.fragmentcategory, container, false);
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.category_fragment, new TabCategoryFragment());
transaction.commit();
return view;
}
In TabCategoryFragment class, I have grid category news and when click item grid I called:
FragmentTransaction transaction = getFragmentManager().beginTransaction();
Bundle bundle = new Bundle();
bundle.putString("category", arrDataZone.get(position).getZone_name());
bundle.putString("zoneid", arrDataZone.get(position).getZone_id());
ListCategoryFragment myFrag = new ListCategoryFragment();
myFrag.setArguments(bundle);
transaction.replace(R.id.category_fragment, myFrag,"listFramgnet");
transaction.addToBackStack("grid_category");
transaction.commit();
Now I want call method in ListCategoryFragment from MainActivity or call method in ListCategoryFragment from FragmentCategory.
Because I try call method in FragmentCategory from MainACtivity with:
linearPlayer.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
int number=viewPager.getCurrentItem();
Fragment fragment= adapter.getItem(number);
if (number==0) {
((FragmentHome)fragment).playAudioSerVice();
} else if(number==1) {
((FragmentHot)fragment).playAudioSerVice();
} else if( number==2) {
((FragmentNew)fragment).playAudioSerVice();
} else if( number==3) {
((FragmentCategory)fragment).playAudioSerVice();
}
}
});
and it ran. Please give me your idea or code to do it.

You can use Eventbus postSticky to resolve it,you can see the api, eventbus
I wrote a demo to simulate your case.Here is the code.
MainActivity:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main22);
getSupportFragmentManager().beginTransaction().replace(R.id.contaner,new MainActivityFragment()).commit();
EventBus.getDefault().register(this);
}
#Subscribe
public void changeFragment(ChangeFragmentEvent event) {
// get event from MainActivityFragment immediately--->EventBus.getDefault().post(new ChangeFragmentEvent());
getSupportFragmentManager().beginTransaction().replace(R.id.contaner,PlusOneFragment.newInstance()).commit();
}
#Override
protected void onDestroy() {
super.onDestroy();
EventBus.getDefault().unregister(this);
}
}
MainActivityFragment:
public class MainActivityFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main22, container, false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
View button = view.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
EventBus.getDefault().post(new ChangeFragmentEvent());//notify MainActivity change fragment
EventBus.getDefault().postSticky(new MEvent());//send a msg to PlusOneFragment,when it shown
}
});
}
}
PlusOneFragment:
public class PlusOneFragment extends Fragment {
public PlusOneFragment() {
}
public static PlusOneFragment newInstance() {
PlusOneFragment fragment = new PlusOneFragment();
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EventBus.getDefault().register(this);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_plus_one, container, false);
return view;
}
#Subscribe(sticky = true)
public void getMEvent(MEvent event){
// get event from MainActivityFragment when PlusOneFragment show --->EventBus.getDefault().postSticky(new MEvent());
Toast.makeText(getActivity(),"Hello,there",Toast.LENGTH_SHORT).show();
}
#Override
public void onDetach() {
super.onDetach();
EventBus.getDefault().unregister(this);
}
}

Fragment and Activities

Hello I am creating an application in Android using Tab Layout. I am not good with fragments and I cant get it to work, the application displays the right layout but button and stuff like that is unresponsive. Here is my code (I cant make the first class "FragmentActivity" because the caller wont accept that
public class ebookC extends android.support.v4.app.Fragment {
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container,
#Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.layout_ebook, container, false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
public static class ebookr extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_ebook);
Button button= (Button) findViewById(R.id.nextbt);
final TextView textView = (TextView) findViewById(R.id.pageCount);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
textView.setText("Works????");
}
});
}
}
}

I'm guessing that the activity ebookr is actually not used. I'm also guessing that the fragment does get used, but you expect the OnClickListener to work.
Here is what I assume you are trying to do:
public class ebookC extends android.support.v4.app.Fragment {
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container,
#Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.layout_ebook, container, false);
Button button= (Button) v.findViewById(R.id.nextbt);
final TextView textView = (TextView) v.findViewById(R.id.pageCount);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
textView.setText("Works????");
}
});
return v;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
}

how to access the value of edittext inside fragment which is in a viewpager

I am having am mainActivity which consists of 3 fragment activity in a view pager .each fragment consists of edit texts .How to get the value of the edit text when swipe fragment horizontally ? I am trying to do like this.below code
public class MainActivity extends FragmentActivity {
int value = 0;
Context context;
String a = "";
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_main);
// Set up the action bar.
//final ActionBar actionBar = getActionBar();
// actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mAddButtonB = (Button) findViewById(R.id.addnewB);
mAddSearchV = findViewById(R.id.addnewSearch);
mAddButtonB.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
mAddSearchV.setVisibility(View.GONE);
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.customviewpager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
});
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
PageZero p0;
PageOne p1;
PageTwo p2;
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
p0 = new PageZero();
p1 = new PageOne();
p2 = new PageTwo();
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return p0;
case 1:
return p1;
case 2:
return p2;
}
return null;
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
}
// PageZero = (Fragment1)getFragmentManager().findFragmentByTag("frag1");
public class PageZero extends Fragment {
private EditText name;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentname, container,
false);
name=(EditText)view.findViewById(R.id.nameTV);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(),a,Toast.LENGTH_SHORT).show();
}
});/*(new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(), a,Toast.LENGTH_SHORT).show();
return false;
}
});*/
return view;
}
}
public class PageOne extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentaddress, container,
false);
return view;
}
}
public class PageTwo extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentmobno, container,
false);
return view;
}
}
}
when i try to access the eddittext inside pageZero class like below
name=(EditText)view.findViewById(R.id.nameTV);
a=name.getText().toString().trim();
i am getting null value.help me out..Thanks in advance.

Change the pagezero class oncreateview code like this .....
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view =getActivity().getLayoutInflater().inflate(R.layout.componentname,null);
name=(EditText)view.findViewById(R.id.nameTV);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(),a,Toast.LENGTH_SHORT).show();
}
return view;
});
Return the view friend and then use default layout inflater...

At the time you click the edittext field, is there any content? Maybe you should get the text in the lost focus event of the edittext field. Thus you can enter some text first...
Example:
name.setOnFocusChangeListener(new OnFocusChangeListener() {
#Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus == false){
//get text from edittext field...
}
}
});
The way you try to get the text looks right to me. At least I do it the same way.
In the PagerAdapter's 'getItem' Method you should instantiate your fragments directly:
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new PageZero();
case 1:
return new PageOne();
case 2:
return new PageTwo();
}
return null;
}
The Viewpager only calls getItem if it wants to create a new item. Unfortunatly they called the method getItem and not createItem which would be more obvious.

Get your EditText inside onClick block...
This mean change the code from:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentname, container, false);
name=(EditText)view.findViewById(R.id.nameTV);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(),a,Toast.LENGTH_SHORT).show();
}
});
return view;
}
To:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentname, container, false);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// GET EDIT TEXT HEAR:
EditText name=(EditText)view.findViewById(R.id.nameTV);
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(),a,Toast.LENGTH_SHORT).show();
}
});
return view;
}

To create a 3 different fragments with view pager you should:
1)Create FragmentActivity with view pager and view pager adapter.
public class FragmentActivity extends FragmentActivity
{
private FragmentAdapter adapter;
private ViewPager pager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment);
adapter = new FragmentAdapter(getSupportFragmentManager());
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
}
2)Create 3 Fragments with static instance
public final class Fragment1 extends Fragment
{
public static Fragment1 newInstance() {
return new Fragment1();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
LinearLayout layout = new LinearLayout(getActivity());
// your fragment xml view
return view;
}
}
3)Fill view pager adapter with it;
public class FragmentAdapter extends FragmentPagerAdapter
{
public InstallFragmentAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return Fragment1.newInstance();
case 1:
return Fragment2.newInstance();
case 2:
return Fragment3.newInstance();
}
return null;
}
}

public class PageZero extends Fragment {
public static EditText name; //change this to public static
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentname, container,
false);
name = (EditText)view.findViewById(R.id.nameTV);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
}
});
return view;
}
}
Then, you can access the public static EditText name (after the view for it has been generated of course) from another fragment like this.
public class PageOne extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentaddress, container,
false);
EditText page_one_text = PageZero.name; //you can get that variable in any fragment now, but using the class name of that fragment to access it
return view;
}
}
Cheers. Please mark this as the correct answer if it helps you. You have quite a bit of answers here

I tried below code. Working for me
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_main_explore, container, false);
ed1 = (EditText)v.findViewById(R.id.editTextTemp);
if( ed1 == null )
{
Toast.makeText(getActivity(), "ERROR UNABLE TO GET EDIT", Toast.LENGTH_LONG).show();
}
// Inflate the layout for this fragment
//return inflater.inflate(R.layout.fragment_main_explore, container, false);
return v;
}