I have an Activity. When I click on the button, I want to run the method in Fragment. But it does not work. I tried many ways, but I could not get it working.
My Activity;
public class MyActivity extends Activity {
Button button;
TabLayout tabLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.myactivity_main);
tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("First"));
tabLayout.addTab(tabLayout.newTab().setText("Second"));
viewPager= (CustomViewPager) findViewById(R.id.pager);
final PagerAdapter adapter = new MyFragmentAdapter(getSupportFragmentManager(),tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
button = (Button)findViewById(R.id.button);
button .setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
MyFragment firstfragment = (MyFragment ) getFragmentManager().findFragmentByTag(“tab1”);
firstfragment.MyMethod();
}
});
}
}
MyFragmentAdapter
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import com.webviewapp.Fragment.PromotionFragment;
import com.webviewapp.Fragment.WebFragment;
public class MyFragmentAdapter extends FragmentPagerAdapter {
int tabCount;
public MyFragmentAdapter(FragmentManager fm, int numberOfTabs) {
super(fm);
this.tabCount = numberOfTabs;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
FirstFragment tab1 = new FirstFragment ();
return tab1;
case 1:
SecondFragment tab2 = new SecondFragment ();
return tab2;
default:
return null;
}
}
#Override
public int getCount() {
return tabCount;
}
}
FirstFragment
public class FirstFragmentextends Fragment {
Button fragmentbutton;
public FirstFragment() {
// Required empty public constructor
}
#SuppressLint("SetJavaScriptEnabled")
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_web, container, false);
fragmentbutton = (Button) view.findByViewId(R.id.fragmentbutton );
}
public void MyMethod(){
fragmentbutton.setVisibility(View.GONE);
}
}
I'm sorry to cause confusion. What I'm trying to do is to run MyMethod when I press the button in Activity. MyMethod is a special method in the fragment. I apologize again for not being able to add the codes at first.
If you want to call a method from FirstFragment
FirstFragment firstFragment = (FirstFragment) getSupportFragmentManager().getFragments().get(0);
firstFragment.MyMethod();
If you want to call a method from SecondFragment
SecondFragment secondFragment = (SecondFragment) getSupportFragmentManager().getFragments().get(1);
secondFragment.MyMethod();
The index 0 or 1 based on position in getItem method of your adapter.
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
FirstFragment tab1 = new FirstFragment();
return tab1;
case 1:
SecondFragment tab2 = new SecondFragment();
return tab2;
default:
return null;
}
}
Then give it a try.
You use FragmentManager to get a handle on the fragment.
You are making a new instance of a Fragment in your code:
final FirstFragment firstfragment= new FirstFragment ();
Where that new object is not bound to any activity.
FragmentManager
Too late for answering the question but this is a easy way to get fragment instance and call methods in a fragment; you have to get instance of your fragment then call your public method:
In your fragment :
private static yourFragment instance;
then in onCreateView of your fragment :
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
instance= this;
View v = inflater.inflate(R.layout.fragment_tools, container, false);
binding = FragmentToolsBinding.inflate(inflater, container, false);
return v;
}
and also in your fragment you have to have a static method that returns the instance:
public static yourFragment GetInstance()
{
return instance;
}
then you have a public method in in your fragment that you want to call it like this:
public void theMethod()
{
Toast.makeText(getActivity(), "Test", Toast.LENGTH_SHORT).show();
}
then you can get fragment instance and call your non static public method like this:
yourFragment frag = yourFragment.GetInstance();
frag.theMethod();
Related
I have 3 main fragments inside viewpager and they have couple of buttons. I want each button to navigate to another fragment and back button to get back to main fragment. I tried to add fragment transaction but it does not work. What am I doing wrong here?
this is one of the main fragments
public class OneFragment extends Fragment implements View.OnClickListener{
public OneFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_one, container, false);
}
#Override
public void onClick(View v) {
switch (v.getId()){
case R.id.aButton:
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_one, AFragment.newInstance());
transaction.commit();
break;
}
}
}
this is the fragment I want to navigate
public class AFragment extends Fragment{
public AFragment() {
}
public static AFragment newInstance() {
AFragment fragment = new AFragment();
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.a_fragment, container, false);
}
}
First, define a public method in your Activity to switch tabs in the ViewPager, and also define the onBackPressed() override, which will select the first index when the back button is pressed:
public void selectIndex(int newIndex) {
mViewPager.setCurrentItem(newIndex);
}
#Override
public void onBackPressed() {
int currentPosition = mViewPager.getCurrentItem();
if (currentPosition != 0) {
mViewPager.setCurrentItem(0);
} else {
super.onBackPressed();
}
}
Then, modify the click listener in the Fragment in order to call the selectIndex() method:
#Override
public void onClick(View v) {
switch (v.getId()){
case R.id.aButton:
//select the index of AFragment:
((MainActivity)getActivity()).selectIndex(1);
break;
}
}
I m new to android and i m having trouble with fragment communication, reading about it discovered the standard method of creating an interface and implementing it from the parentActivity which doesn't work in my case which is as follows.
I have an Activity named as ActivityA which extends fragment activity,in which i have a view pager for i want to keep two fragments namely fragmentA and fragmentB which should be swipable fragments.
fragmentA has a button which onClicked should make a change in fragmentB, to be precise on click it should add a string in the listView in fragmentA.
Now i have created the both the fragments's layouts as well as added the viewPAger to my FragmentActivity, they work great on swiping, the function is executed onButtonClick of fragmentA and logic works perfectly, after this is i want the changes to be reflected in fragmentB.
Using the interface method i can't find the reference to my fragment by id as it is added by viewPager to ActivityA
How do i do this??
help me out.
Stackoverflow says don't ask questions with out code so
Here is the Sample code
Activity A which has a virewPAger, need help how to get my fragment's Reference from the viewPager
public class ActivityA extends FragmentActivity implements FragmentA.Communicator
{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_A);
viewPager= (ViewPager) findViewById(R.id.pager);
fragmentManager=getSupportFragmentManager();
viewPager.setAdapter(new myAdapter(fragmentManager));
}
class myAdapter extends FragmentPagerAdapter{
public myAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
#Override
public Fragment getItem(int i) {
Fragment fragment = null;
switch (i){
case 0: fragment = new listOfIDsScanned();
break;
case 1: fragment = new displayCounter();
break;
default: //something witch won't crush the app
break;
}
return fragment;
}
#Override
public int getCount() {
return 2;
}
}
This is fragmentA , actual fragment name is something else just for simple representation calling it fragmentA, which has an interface Communicator to communicate between fragments
public class fragmentA extends android.support.v4.app.Fragment implements View.OnClickListener
{
TextView counter;
Button scanStudentID;
int count=0;
String name=null,rollNo=null;
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.display_counter,container,false);
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
scanStudentID= (Button) getActivity().findViewById(R.id.startScanning);
scanStudentID.setOnClickListener(this);
}
#Override
public void onClick(View v)
{
switch(v.getId()){
case R.id.startScanning:
startScanning();
break;
}
}
public void startScanning()
{
startActivityForResult(new Intent(getActivity(),Barcode.class),1);
}
public interface Communicator
{
// necessary methods
}
}
now finally fragmentB, in which methodToBeCalled(parameters) has to be invoked on the button click in fragementA
public class fragementB extends android.support.v4.app.Fragment
{
ListView listView;
ArrayList<String> rollNo= new ArrayList<>();
ArrayList<String> studentName= new ArrayList<>();
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_list_of_ids_scanned,container,false);
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
listView= (ListView) getActivity().findViewById(R.id.listView);
}
public void methodToBeCalled(String rollNo,String studentName)
{
if(!alreadyScanned(rollNo))
{
}
else
{
}
}
boolean alreadyScanned(String rollNo)
{
return true;
}
}
I have a FragmentActivity in my android application.
I use a viewPager to insert tabs in the activity. So I have this code. It works.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_clienti);
Bundle extras = getIntent().getExtras();
if (extras != null) {
String datas= extras.getString("Cliente");
if (datas!= null) {
System.out.println("pippo");
}
}
TabAdapter = new DemoCollectionPagerAdapter(getSupportFragmentManager());
Tab = (ViewPager)findViewById(R.id.pager);
Tab.setOnPageChangeListener(
new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar = getActionBar();
actionBar.setSelectedNavigationItem(position); }
});
Tab.setAdapter(TabAdapter);
actionBar = getActionBar();
//Enable Tabs on Action Bar
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.TabListener tabListener = new ActionBar.TabListener(){
#Override
public void onTabReselected(android.app.ActionBar.Tab tab,
FragmentTransaction ft) {
// TODO Auto-generated method stub
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
Tab.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(android.app.ActionBar.Tab tab,
FragmentTransaction ft) {
// TODO Auto-generated method stub
}};
//Add New Tab
actionBar.addTab(actionBar.newTab().setText("Scheda Cliente").setTabListener(tabListener));
actionBar.addTab(actionBar.newTab().setText("Conto Cliente").setTabListener(tabListener));
apriConnessioneDB();
}
This is the class FragmentStatePagerAdapter
public class DemoCollectionPagerAdapter extends FragmentStatePagerAdapter {
public DemoCollectionPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
switch (i) {
case 0:
//Fragement for Android Tab
return new infoCliente();
case 1:
//Fragment for Ios Tab
return new infoCliente();
case 2:
//Fragment for Windows Tab
return new infoCliente();
}
return null;
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
return "OBJECT " + (position + 1);
}
}
This is the class Fragment:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.view_infocliente, container, false);
if(savedInstanceState!=null){
//String tmp = savedInstanceState.getString("myKey");
//TextView mTabHost = (TextView) findViewById(android.R.id.labelRagioneSociale);
System.out.println("PIPPPPPPPPPPPPPPPPPPPPPP");
}
TextView btn=(TextView) view.findViewById(R.id.labelRagioneSociale5);
btn.setText("pippo");
return view;
}
Now I want to know How I can pass a parameter to infoCliente class.
In the onCreate method of first class I have this:
String datas= extras.getString("Cliente");
I want pass this parameter to fragment class.
Bundle bundle = new Bundle();
bundle.putInt("battery", bat);
MyFragment fragment=new MyFragment();
fragment.setArguments(bundle);
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.add(R.id.fragment_container,fragment);
ft.commit();
Then in onCreate() method of the fragment:
Bundle bundle=getArguments(); int mLabel = bundle.getInt("battery",0);
Define an interface in your Fragment, for example
public interface FragmentCallback {
onSomethingHappend(String param);
}
Implement the interface in your Activity.
Then, when you want to call the callback, do something like this:
FragmentCallback callback = (FragmentCallback) getActivity();
callback.onSomethingHappened(string);
in my app i have a Tabs with fragment classes. i trying to refresh listView in "fragment a" with the new data i insert.
In "fragment b" i have EditText and Button ,that inserting text to the database.
in "fragment a" i have the ListView with the dataBase rows. when "fragment a" is "OnCreateView" i just put the dataBase on a "ArrayList" and past it to my baseAdapter.
but "onCreateView" not refreshing my new data every time i get into the "fragment a" else i goes to "fragment c" and "onDestroy" call on "fragment a".
so my result it was to call : "setUserVisibleHint" override method, and check if it is visible and refreshing the list.
but i dont think it is the good practice .
what should i do?
Class a
public class ListFragment extends Fragment{
basAdapterCustom adapter;
ListView lv;
ArrayList<Clock> list;
private DbHandler hand;
Context context;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.list_fragment, container, false);
context = getActivity();
Log.d(TAG, "onCreateView");
hand = new DbHandler(context);
list = new ArrayList<Clock>();
lv = (ListView) v.findViewById(R.id.listOfShifts);
adapter = new basAdapterCustom(list, getActivity());
lv.setAdapter(adapter);
refreshList();
return v;
}
//like on "resume":
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
// Make sure that we are currently visible
if (this.isVisible()) {
refreshList();
if (!isVisibleToUser) {
// TODO stop
}
}
}
private void refreshList() {
list = hand.getByWorkName();
adapter = new basAdapterCustom(list,getActivity());
lv.setAdapter(adapter);
}
class b:
public class ClockFragment extends Fragment{
DbHandler hand;
Context context;
#Override
public View onCreateView(LayoutInflater inflater,
#Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.clock, container,false);
context = getActivity();
hand = new DbHandler(context);
return v;
}
// ADD to .Db
public void addToDb(View v){
hand.add(new Clock(0, dateDay));
}
}
class mainActivity:
public class MainActivity extends FragmentActivity implements ActionBar.TabListener, OnPageChangeListener{
public static final String TAG = "myClock";
String[] tabMenu = {"FRAG A","FRAG B","FRAG C"};
private ViewPager viewPager;
private TabPagerAdapter mAdapter;
private ActionBar actionBar;
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(MainActivity.TAG, "OnCreate = MainActivity (Pager");
viewPager = (ViewPager) findViewById(R.id.pager );
actionBar = getActionBar();
mAdapter = new TabPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
for (String tabsNames : tabMenu) {
actionBar.addTab(actionBar.newTab().setText(tabsNames).setTabListener(this));
}
viewPager.setOnPageChangeListener(this);
}
// public void transDialog(){
// Dialog mDialog = new Dialog(this, android.R.style.Theme_Translucent_NoTitleBar_Fullscreen);
// }
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
}
PagetAdapter.class
public class TabPagerAdapter extends FragmentPagerAdapter {
private static final String TAG = "myClock";
public TabPagerAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
#Override
public Fragment getItem(int index) {
Log.d(TAG, " CLASS : TabPagerAdapter");
switch (index) {
case 0:
return new ListFragment();
case 1:
return new ClockFragment();
case 2:
return new SettingFragment();
default:
break;
}
Log.d(TAG, " CLASS : TabPagerAdapter = "+index);
return null;
}
#Override
public int getCount() {
return 3;
}
}
Please help me i hope you are understand my problem...
You want to update listView in fragment A, after insert data in fragment b? Then you have a few solutions to choose:
1. Implement communications between fragments via activity. Then B insert date, it send message to activity, that data need to be updated. Then fragment A started, it's ask activity to need update data. For details on implementing this communication check link.
2. Use some bus library, EventBus for example. Then fragment B insert data, it post 'data changed' event to bus. Fragment A checks on start if this event occurs.
3. Use Loaders which "monitor the source of their data and deliver new results when the content changes."
I'm currently using FragmentStatePagerAdapter and I would like it to have a "navigate up" feature (DisplayHomeAsUpEnabled). When I set the following code it shows up as a correct navigate back button. But nothing happens when I click on it, can you guys see anything that I', doing wrong in my code, I get no error while pressing the "navigate up" button and I get no compiler errors.
Here is the code, its in the "public boolean onOptionsItemSelected(MenuItem item) {" it gets interesting at the bottom.
public class ShareholdingDetailFragment extends FragmentActivity {
final int NUM_ITEMS = Portfolio.getPortfolio().count();
MyAdapter mAdapter;
ViewPager mPager;
Bundle extras;
#Override
protected void onCreate(Bundle savedInstanceState) {
System.out.println(NUM_ITEMS + "e");
super.onCreate(savedInstanceState);
setContentView(R.layout.shareholdingdetailview_fragment_wrapper);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
}
public class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
public int getCount() {
return NUM_ITEMS;
}
public Fragment getItem(int position) {
return ShareholdingFragment.newInstance(position);
}
}
public static class ShareholdingFragment extends Fragment {
int mNum;
static ShareholdingFragment newInstance(int num) {
ShareholdingFragment f = new ShareholdingFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
}
#SuppressLint({ "NewApi", "NewApi" })
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.shareholdingdetailview_fragment, container, false);
/****************Setting the Display as home and it shows*******************/
ActionBar bar = getActivity().getActionBar();
bar.setDisplayHomeAsUpEnabled(true);
/**********************************/
return view;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home://Not working
System.out.println("test");//This isn't printed out
Intent upIntent = new Intent(getActivity(), DetailShareHoldingActivity.class);
if (NavUtils.shouldUpRecreateTask(getActivity(), upIntent)) {
getActivity().finish();
} else {
NavUtils.navigateUpTo(getActivity(), upIntent);
}
return true;
}
return super.onOptionsItemSelected(item);
}
}
}
Try adding: setHasOptionsMenu(true); in your onCreate() in ShareholdingFragment.
Add setHomeButtonEnabled(true) on API Level 14 and higher when you configure your action bar. On API Level 11-13, the home button is enabled automatically.
If you're using the new Toolbar and ActionbarDrawerToggle. You can assign clickHandler directly. For my activities that have this drawer toolbar I implemented an interface to enable drawer if at root,
#Override
public void enableDrawer(boolean enable) {
mDrawerToggle.setDrawerIndicatorEnabled(enable);
mDrawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Pop fragment back stack or pass in a custom click handler from the fragment.
}
});
}