I have four Fragments(tab swipe stuff). For example I created a Toast in my Fragment #2, but this toast also comes up in my Fragment #4 when I open it.
What is missing here .
this is my fragment #2
public class A extends Fragment {
View view ;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.xxx_updates_layout, container, false);
//Custom Toast
LayoutInflater inflaterToast = getActivity().getLayoutInflater();
View layout = inflaterToast.inflate(R.layout.d_toast_d,
(ViewGroup) view.findViewById(R.id.toast_layout_root));
ImageView image = (ImageView) layout.findViewById(R.id.image);
image.setImageResource(R.drawable.ic_people);
TextView text = (TextView) layout.findViewById(R.id.text);
text.setText("Ringtone Bank");
Toast toast = new Toast(getActivity().getApplicationContext());
toast.setGravity(Gravity.BOTTOM, 0, 0);
toast.setDuration(Toast.LENGTH_SHORT);
toast.setView(layout);
toast.show();
return view;
} //onCreate
}
This is my fragment #4
public class XXXSentFragment extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.xxx_sent_layout,null);
}
}
My Fragment Pager Adapter
public class XXXTabFragment extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 4 ;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View x = inflater.inflate(R.layout.xxx_tab_layout,null);
tabLayout = (TabLayout) x.findViewById(R.id.tabs);
viewPager = (ViewPager) x.findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
#Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
return x;
}
class MyAdapter extends FragmentPagerAdapter{
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new XXXPrimaryFragment();
case 1 : return new XXXSocialFragment();
case 2 : return new XXXUpdatesFragment();
case 3 : return new XXXFOUR();
}
return null;
}
#Override
public int getCount() {
return int_items;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return "Primary";
case 1 :
return "Social";
case 2 :
return "Updates";
case 3 :
return "Four";
}
return null;
}
}
}
The thing is that View Page loads 3 fragments at a time (the one being shown, the one on the left and the one on the right). Hence the onCreateView for all of them get called at once which is why the toast from another fragment appears.Put a log statement in the onCreateView of all your fragments to verify this and to get a better understanding of how this works.
If your use case is to show a toast when the user swipes or selects a certain fragment (In your case XXXUpdatesFragment()), one way to go about this is to hold references to your fragments in your FragmentPagerAdapter and then implement the onPageChangeListener on the viewPager, when the page changes to 2, use the reference to call a method inside XXXUpdatesFragment() which will show a toast.
public class XXXUpdatesFragment extends Fragment {
View view ;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
view = inflater.inflate(R.layout.xxx_updates_layout, container, false);
return view;
}
public void showToast() {
//Custom Toast
LayoutInflater inflaterToast = getActivity().getLayoutInflater();
View layout = inflaterToast.inflate(R.layout.d_toast_d,
(ViewGroup) view.findViewById(R.id.toast_layout_root));
ImageView image = (ImageView) layout.findViewById(R.id.image);
image.setImageResource(R.drawable.ic_people);
TextView text = (TextView) layout.findViewById(R.id.text);
text.setText("Ringtone Bank");
Toast toast = new Toast(getActivity().getApplicationContext());
toast.setGravity(Gravity.BOTTOM, 0, 0);
toast.setDuration(Toast.LENGTH_SHORT);
toast.setView(layout);
toast.show();
}
}
Related
I want to move some data from my Mainactivity to a Fragment...which is inside a tab fragment (which handles a SectionPagerAdapter)....which is inside a fragment in Mainactivity2.
I feel its too complicated and cant get it done.
GameEndedActivity (See wrong and correct variable...these are to be transferred)
public class GameEndedActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_ended);
int correct = getIntent().getIntExtra("correct", 0);
int wrong = getIntent().getIntExtra("wrong", 0);
}
}
TabFragment
public class TabFragment extends Fragment {
private int tabsCount;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_tab, container, false);
if(this.getContext() instanceof ChallengeOverviewActivity){
tabsCount = 2;
} else {
tabsCount = 3;
}
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this.getContext(), getFragmentManager(), tabsCount);
ViewPager viewPager = view.findViewById(R.id.view_pager);
viewPager.setAdapter(sectionsPagerAdapter);
TabLayout tabs = view.findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
return view;
}
}
ResultFragment (Transfer data here - wrong and correct variables)
public class ResultDetailsFragment extends Fragment {
private TextView tvWrong, tvCorrect;
private AnswerListener answerListener;
public interface AnswerListener {
public void correct(int i);
public void wrong(int i);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_result_details, container, false);
tvCorrect = view.findViewById(R.id.tvCorrect);
tvWrong = view.findViewById(R.id.tvWrong);
return view;
}
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
if (context != null) {
answerListener = (AnswerListener) context;
}
}
}
One way to do this is the add arguments to the fragment when you create an instance of it. In your activity when you create the fragment you want to attach you add some arguments to it. These arguments can then be accessed from the fragments onCreate method.
Just do this same thing again when you are in your fragment and create your second one.
Check this answer out which explains more in detail how to do it: https://stackoverflow.com/a/17436739/964887
I'm using ViewPager to show welcome, register, and some other screens. those screens are fragments controlled by FragmentStatePagerAdapter:
private static class TourPagerAdapter extends FragmentStatePagerAdapter {
public TourPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
WellcomeTourFragment ta = null;
switch (position) {
case 0:
ta = WellcomeTourFragment.newInstance(R.layout.welcome_fragment);
break;
case 1:
ta = WellcomeTourFragment.newInstance(R.layout.signup_fragment);
break;
first fragment (WellcomeFragment) shows some views and background image loaded from internet using picasso library:
private ImageView bkgImage;
public static WellcomeTourFragment newInstance(int layoutId){
WellcomeTourFragment pane = new WellcomeTourFragment();
Bundle args = new Bundle();
args.putInt(LAYOUT_ID, layoutId);
pane.setArguments(args);
return pane;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final ViewGroup rootView = (ViewGroup) inflater.inflate(getArguments().getInt(LAYOUT_ID, -1), container, false);
this.bkgImage = (ImageView) rootView.findViewById(R.id.imgView_Background);
return rootView;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
Picasso.with(getActivity())
.load(IMG_uRL)
.into(this.bkgImage);
}
My problem here is that, i am getting
java.lang.IllegalArgumentException: Target must not be null.
I am sure the ImageView does exits in my welcome_fragment layout. but really don't know what makes target to be null.
Are you sure that the correct layout is being inflated? Try debugging and looking at the rootView after it has been inflated. Is it possible you are including the wrong layout id when you call your newInstance method?
My eventual goal is to have users be able to switch between tabs with dynamically generated content (based on user input) in an activity. I am trying to create a dynamic layout and have it load as the layout within a fragment. My code is throwing an error because the layout I am trying to provide is not an xml resource. Is what I'm trying even possible to do?
public static class JobsFragment extends Fragment{
LinearLayout l;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
//set button vars here
Log.i("aaa","called frag onCreate");
l=new LinearLayout(getActivity());
Button b=new Button(getActivity());
b.setText("HI");
l.addView(b);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
Log.i("aaa","called frag onCreateView()");
//View rootView = inflater.inflate(R.layout.fragment_section_dummy, container, false);
View rootView = inflater.inflate(l, container, false);
return rootView;
}
}
/**
* A {#link FragmentPagerAdapter} that returns a fragment corresponding to one of the primary
* sections of the app.
*/
public static class AppSectionsPagerAdapter extends FragmentPagerAdapter{
public AppSectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
Fragment fragment = new JobsFragment();
return fragment;
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
return "Section " + (position + 1);
}
}
}
Make the fragment constructor accept linearlayout as parameter and use this field to be return from onCreateView
Something like following psuedo code
CustomFragment{
private LinearLayout mLayout;
CustomFragment(LinearLayout layout){
mLayout=layout;
| }
onCreatView(....)
{
return mLayout;
}
}
You need to add layout width and height programatically.
Without which it will throw error about mandatory layout parameters not provided.
addLayoutParams is the method name
Trying to create application with view pager inside navigation drawer. I've options to select from navigation and depending on that (outer selection), i have to populate different number of fragments in view pager.
I've used tutorials to create navigation drawer and view pager separately from Google docs. As per docs, view pager have fixed number of fragments. if i hard code that way everything works fine.
But, when i try to make it dynamic as per left selection, i'm getting illegal state exception
for instance, I've implemented fragmentstatepageradapter,
public class innerFragment extends Fragment {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
public static final String active_outer_option = "section_number";
public innerFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_outer, container,
false);
Log.d("logs", "onCreateView:innerFragment()");
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) rootView.findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(Integer
.parseInt(getArguments().getString(active_outer_option)));
Log.d("logs", "onAttach:innerFragment()");
}
public class SectionsPagerAdapter extends FragmentStatePagerAdapter {
private int active_outer_option= 0;
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
Log.d("logs", "getItem(int " + position + ")");
active_outer_option = position;
Bundle b = new Bundle();
b.putString("section_number", "" + position);
DummySectionFragment fragment = new DummySectionFragment();
fragment.setArguments(b);
return fragment;
}
#Override
public int getCount() {
switch (active_outer_option) {
case 0:
return 9;
case 1:
return 2;
case 2:
return 2;
case 3:
return 2;
case 4:
return 4;
default:
return 0;
}
}
#Override
public CharSequence getPageTitle(int position) {
Log.d("logs", "getPageTitle(int " + position + ")");
return "OP " + String.valueOf(position);
}
}
public static class DummySectionFragment extends Fragment {
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d("logs", "onCreateView:DummySectionFragment()");
View rootView = inflater.inflate(R.layout.fragment_inner,
container, false);
TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
dummyTextView.setText(getArguments().getString(ARG_SECTION_NUMBER));
return rootView;
}
}
}
when i run this application, its giving "Unfortunately application stopped working" and exception is:
java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 9, found: 2 Pager id: com.xxx.xxx:id/pager Pager class: class android.support.v4.view.ViewPager Problematic adapter: class com.xxx.xxx.innerFragment$SectionsPagerAdapter
any idea whats wrong with that exception and code?
Edit:
from my debugging first everything is fine and gettitle is called twice with index 0 and 1 and after that getcount is called with index and getting exception.
does this ring any bells?
I'm new to Android programming.
I have a list of items, when the user clicks on an item it takes them to a screen with that item details.
I want the user to have the ability to swipe right and left to view other items' details in the list, instead of going back to the list and choosing another item.
I read that I need to use ViewPager for the ability to swipe right and left, so I did that.
ViewPager works fine, but my problem when I click any item on the list I always get to the first page in the ViewPager.
I don't want that, what I want is if I click on item 4 on the list it takes me to page 4 in the view pager and still have the ability to swipe right and left to view the details of other items.
I know how to set the page in viewpager by using mPager.setCurrentItem(0)
But I don't know how to set it according to which item was selected from the list (i.e which item launched the activity).
Here is my code:
Main activity which contains the listview:
public class Main extends SherlockListActivity implements OnItemClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView mylist = (ListView) findViewById(android.R.id.list);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.simple_list_reda_1, R.id.list_content, getResources().getStringArray(R.array.items_list_array) );
mylist.setAdapter(adapter);
mylist.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> arg0,View arg1, int position, long arg3)
{
Intent n = null;
switch (position){
case 0:
n = new Intent(getApplicationContext(), ViewPagerClass.class);
break;
case 1:
n = new Intent(getApplicationContext(), ViewPagerClass.class);
break;
case 2:
n = new Intent(getApplicationContext(), ViewPagerClass.class);
break;
case 3:
n = new Intent(getApplicationContext(), ViewPagerClass.class);
break;
}
if(null!=n)
startActivity(n);
}
});
}
}
ViewPagerClass
public class ViewPagerClass extends SherlockFragmentActivity{
static final int NUM_ITEMS = 4;
MyAdapter mAdapter;
ViewPager mPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.viewpager_layout);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager) findViewById(R.id.viewpager);
mPager.setAdapter(mAdapter);
//mPager.setCurrentItem(2);
final ActionBar ab = getSupportActionBar();
ab.setDisplayHomeAsUpEnabled(true);
ab.setDisplayUseLogoEnabled(false);
ab.setDisplayShowHomeEnabled(false);
}
public static class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return NUM_ITEMS;
}
#Override
public Fragment getItem(int position) {
switch(position){
case 0: return FirstPageFragment.newInstance();
case 1: return SecondPageFragment.newInstance();
case 2: return ThirdPageFragment.newInstance();
case 3: return FourthPageFragment.newInstance();
}
return null;
}
}
public static class FirstPageFragment extends Fragment {
public static FirstPageFragment newInstance() {
FirstPageFragment f = new FirstPageFragment();
return f;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View V = inflater.inflate(R.layout.fragment1, container, false);
return V;
}
}
public static class SecondPageFragment extends Fragment {
public static SecondPageFragment newInstance() {
SecondPageFragment f = new SecondPageFragment();
return f;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View V = inflater.inflate(R.layout.fragment2, container, false);
return V;
}
}
public static class ThirdPageFragment extends Fragment {
public static ThirdPageFragment newInstance() {
ThirdPageFragment f = new ThirdPageFragment();
return f;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View V = inflater.inflate(R.layout.fragment3, container, false);
return V;
}
}
public static class FourthPageFragment extends Fragment {
public static ThirdPageFragment newInstance() {
ThirdPageFragment f = new ThirdPageFragment();
return f;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View V = inflater.inflate(R.layout.fragment4, container, false);
return V;
}
}
Finally viewpager_layout.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<android.support.v4.view.ViewPager
android:id="#+android:id/viewpager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
So in short What I want is:
If I click on item 3 in the list I go to screen with the details on item 3, and if I swipe to the right I get to item 4, and if I swipe to the left I get to item 2.
In the onItemClickListener() you need to add an extra to the intent so you can get it when that activity launches.
n.putExtra("POSITION_KEY", position);
In the ViewPagerClass onCreate() using the
int position = getIntent().getIntExtra("POSITION_KEY", 0);
mPager.setCurrentItem(position);
That should do what you are wanting to do.