Develop Reference

How Can I Pass Information to my Fragments Inside ViewPager Tabs?

I have a main home activity which consists of 3 tabs at the bottom of the screen.
Inside this activity I have a fragment.
This fragment contains a view pager. This view pager is used to navigate between 2 activities:
1.Exercise Form = This displays a video for the exercise.
2.Exercise History = This shows all of the users recorded data on the exercise.
To obtain the exercise form video as well as the exercise history, I need to be able to access the ExerciseName from ProgressFagment2 (The text at the top of the screen) and pass this to the 2 child fragments (ExerciseHomeVideoFragment and ExerciseHistoryFragment)
How can I access the exerciseName in the child fragments?
ProgressFragment2 (Fragment Inside Activity)
public class Progress_Fragment2 extends Fragment {
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.exercises_history_demo, container, false);
}
public void onViewCreated(View view, Bundle savedInstanceState) {
childExerciseName = getArguments().getString("ExerciseName");
TextView title_tv = getView().findViewById(R.id.textView_exerciseName8);
title_tv.setText(childExerciseName);
SectionsPagerAdapter mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
ViewPager mViewPager = (ViewPager) getView().findViewById(R.id.view_pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) getView().findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// Inflate the menu; this adds items to the action bar if it is present.
inflater.inflate(R.menu.top_navigation_two, menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position) {
case 0:
fragment = new ExerciseHomeVideoFragment();
break;
case 1:
fragment = new ExerciseHistoryFragment();
break;
}
return fragment;
}
#Override
public int getCount() {
// Show 2 total pages.
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Exercise Form";
case 1:
return "Exercise History";
}
return null;
}
}
}
ExerciseHomeVideoFragment (One of the 2 fragments inside viewPager) |Relevant code only
public class ExerciseHomeVideoFragment extends Fragment implements View.OnClickListener {
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_exercise_info_home_version, container, false);
}
#RequiresApi(api = Build.VERSION_CODES.O)
public void onViewCreated(View view, Bundle savedInstanceState) {
Progress_Fragment2 parentFrag = ((Progress_Fragment2)ExerciseHomeVideoFragment.this.getParentFragment());
youTubeBtn = getView().findViewById(R.id.youTubeSearchButton);
parent_tv = getView().findViewById(R.id.textView_exerciseName8);
childExerciseViewModel = ViewModelProviders.of(this).get(ChildExerciseViewModel.class);
//
// HOW CAN I ACCESS THE CHILDEXERCISE NAME???
//
// childExerciseName = getArguments().getString("ExerciseName"); // THIS DOESNT WORK
// exerciseNameTV.setText(childExerciseName + " Demo");
}
}

you can send data using Interface, set argument or newInstance
in your tab fragment
switch (position) {
case 0:
fragment = new ExerciseHomeVideoFragment().newInstance(childExerciseName);
break;
case 1:
fragment = new ExerciseHomeVideoFragment();
break;
}
ExerciseHomeVideoFragment
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.annotation.RequiresApi;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class ExerciseHomeVideoFragment extends Fragment {
public static ExerciseHomeVideoFragment newInstance(String ExerciseName) {
Bundle args = new Bundle();
args.putString("ExerciseName", ExerciseName);
ExerciseHomeVideoFragment fragment = new ExerciseHomeVideoFragment();
fragment.setArguments(args);
return fragment;
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_exercise_info_home_version, container, false);
}
#RequiresApi(api = Build.VERSION_CODES.O)
public void onViewCreated(View view, Bundle savedInstanceState) {
TextView title_tv = getView().findViewById(R.id.textView_exerciseName8);
//
Bundle bundle = getArguments();
if(bundle!=null)
{
title_tv.setText(bundle.getString("ExerciseName"));
}
}
}
you can send model also, but the model should be implemented using Serializer
switch (position) {
case 0:
fragment = new ExerciseHomeVideoFragment().newInstance(childExerciseViewModel);
break;
case 1:
fragment = new ExerciseHomeVideoFragment();
break;
}
in fragment
public static ExerciseHomeVideoFragment newInstance(String ExerciseName,ChildExerciseViewModel childExerciseViewModel) {
Bundle args = new Bundle();
args.putString("ExerciseName", ExerciseName);
args.putSerializable("model", childExerciseViewModel);
ExerciseHomeVideoFragment fragment = new ExerciseHomeVideoFragment();
fragment.setArguments(args);
return fragment;
}
Bundle bundle = getArguments();
if(bundle!=null)
{
title_tv.setText(bundle.getString("ExerciseName"));
ChildExerciseViewModel model = (ChildExerciseViewModel) bundle.getSerializable("model");
title_tv.setText(model.gettourExerciseText());
}

I think it's a good idea to use better architecture. for example if you use a singleton class to store your data you will be able to use them without passing to the fragment. search about singleton.
Android has a new feature that has been released 3 months later. you can use setFragmentResultListener.
here is the documentation:
https://developer.android.com/reference/androidx/fragment/app/FragmentManager#setfragmentresultlistener

Android ViewPager displays white screen

I'm trying to create VeiwPager inside a Fragment using FragmentStatePagerAdapter.
it displays the first fragment but after scrolling to the second fragment there is just white fragment (even on scrolling back to the first fragment)
I've tried to use PagerAdapter and set pictures without fragment but the result is same.
is there RAM problem ? what can I do to solve it?
Home fragment(contains ViewPager) :
private void initSlideShow(View view){
VPImageSlider = (ViewPager16by9) view.findViewById(R.id.VPImageSlider);
sliderDotsPanel = (LinearLayout) view.findViewById(R.id.SliderDots);
VPImageSliderAdapter vpImageSliderAdapter = new VPImageSliderAdapter(getFragmentManager());
vpImageSliderAdapter.addSlide(R.drawable.dc_slide_1);
vpImageSliderAdapter.addSlide(R.drawable.dc_slide_2);
vpImageSliderAdapter.addSlide(R.drawable.dc_slide_3);
vpImageSliderAdapter.addSlide(R.drawable.dc_slide_4);
vpImageSliderAdapter.addSlide(R.drawable.dc_slide_5);
VPImageSlider.setAdapter(vpImageSliderAdapter);
}
ViewPager Fragment:
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import iranelab.samsoft.net.iranelab.Classes.ImageView16by9;
import iranelab.samsoft.net.iranelab.R;
public class ViewPagerFragment extends Fragment {
private static final String ARG_PARAM4 = "imageTest";
private int imageTest;
public ViewPagerFragment() {}
public static ViewPagerFragment newInstance(String imageId, String type, String text,int imageTest) {
ViewPagerFragment fragment = new ViewPagerFragment();
Bundle args = new Bundle();
args.putInt(ARG_PARAM4, imageTest);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
imageTest = getArguments().getInt(ARG_PARAM4);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_view_pager, container, false);
ImageView16by9 image = (ImageView16by9) view.findViewById(R.id.IVSlide);
image.setImageResource(imageTest);
return view;
}
}
ViewPager Adapter :
public class VPImageSliderAdapter extends FragmentStatePagerAdapter {
private int[] slides = {};
public VPImageSliderAdapter(FragmentManager fm){
super(fm);
}
public void addSlide(int drawable){
slides = Arrays.copyOf(slides,slides.length+1);
slides[slides.length-1]=drawable;
}
#Override
public int getCount() {
return slides.length;
}
#Override
public Fragment getItem(int position) {
return ViewPagerFragment.newInstance(slides[position]);
}
}

Change
VPImageSliderAdapter vpImageSliderAdapter = new VPImageSliderAdapter(getFragmentManager());
to
VPImageSliderAdapter vpImageSliderAdapter = new VPImageSliderAdapter(getChildFragmentManager());
it will work

Just needed to add :
ViewPager.setOffscreenPageLimit(5);

(Swipe Views) how to make Fragment objects dynamically for ViewPager at runtime?

The idea: In my app, it has 15 lessons, each lesson containing 30 couplets a user can swipe through. And each fragment/couplet_page has inflated a layout that contains 3 text views. I'm using FragmentStatePagerAdapter.
I've learned that use switch case statements to create swipe views but the problem is, there are lots of fragments to be created and I know that there is a better solution for it that I don't know. I just wanna use one fragment and somehow change the text with setText method.
here's my one fragment object code
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class CoupletOneFragment extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.couplet_one, container, false);
}
}
and here's the custom pager adapter
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
public class MyFragmentAdapter extends FragmentStatePagerAdapter {
public MyFragmentAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new CoupletOneFragment();
case 1:
return new CoupletTwoFragment();
case 2:
return new CoupletThreeFragment();
case 3:
return new CoupletFourFragment();
case 4:
return new CoupletFiveFragment();
and so on...
default:
break;
}
return null;
}
#Override
public int getCount() {return 30;}
}

Try this way, in your state pager adapter use loop- size is number of fragments:
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
for (int i=0;i<size;i++){
adapter.addFragment(CoupletFiveFragment.newInstance(i));
}
viewPager.setAdapter(adapter);
Adapter:
public class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment) {
mFragmentList.add(fragment);
}
}
Now your Fragment:
public static CoupletFiveFragment newInstance(int j) {
CoupletFiveFragment fragmentDemo = new CoupletFiveFragment();
Bundle args = new Bundle();
args.putInt("GET_LIST", j);
fragmentDemo.setArguments(args);
return fragmentDemo;
}
Get Value in Oncreate:
Int getINT=0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getINT = getArguments().getInt("GET_LIST");
}

Well I'm gonna answer my own question here
Updated fragment object code
public class FragmentChild extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
// INFLATE THE LAYOUT THAT EACH FRAGMENT OBJECT WILL HAVE, PUT IT IN A VIEW
View root = inflater.inflate(R.layout.couplets, container, false);
// RECEIVE THE BUNDLE DATA SENT (ARGUMENTS)
Bundle args = getArguments();
// CREATE AN ARRAY LIST OF STRINGS THAT WILL HOLD TEXT
ArrayList<String> someText = new ArrayList<>();
someText.add("one");
someText.add("two");
someText.add("three");
TextView txt = (TextView) root.findViewById(R.id.text_view);
txt.setText(someText.get(args.getInt("position")));
return root;
}
Updated custom pager adapter
class MyFragmentAdapter extends FragmentStatePagerAdapter {
MyFragmentAdapter(FragmentManager fm) {super(fm);}
#Override
public Fragment getItem(int position) {
Bundle args = new Bundle();
args.putInt("position", position);
Fragment fragment = new FragmentChild();
fragment.setArguments(args);
return fragment;
}
#Override
public int getCount() {
return 3;
}
}
And finally host activity
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chapter_one);
// FIND THE VIEWPAGER AND SET THE CUSTOM ADAPTER TO IT TO PROVIDE CHILD PAGES
ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
MyFragmentAdapter adapter = new MyFragmentAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
}
}
It was easy peasy!

Pass data from one design tab to another tab

I am using material design tabs as follows :
Following is my MainActivity.class :
public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener {
private TabLayout tabLayout;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tabLayout = (TabLayout) findViewById(R.id.tabs);
viewPager = (ViewPager) findViewById(R.id.viewpager);
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(this);
tabLayout.setupWithViewPager(viewPager);
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
System.out.println("onPageSelected Called");
}
#Override
public void onPageScrollStateChanged(int state) {
}
}
My ViewPagerAdapter is as follows :
public class ViewPagerAdapter extends FragmentPagerAdapter {
private static int count = 2;
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FragmentOne();
case 1:
return new FragmentTwo();
}
return null;
}
#Override
public int getCount() {
return count;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position)
{
case 0 :
return "Tab One";
case 1 :
return "Tab Two";
}
return null;
}
}
and here are my Fragments :
This is my first fragment name is FragmentOne :
public class FragmentOne extends Fragment {
private EditText editText;
private Button btnSendData;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
System.out.println("IN FRAGMENT ONE");
View view = inflater.inflate(R.layout.fragment_one,container,false);
editText = (EditText) view.findViewById(R.id.et_name);
btnSendData = (Button) view.findViewById(R.id.btn_send);
btnSendData.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentTwo fragment = new FragmentTwo();
Bundle bundle = new Bundle();
bundle.putString("username",editText.getText().toString());
fragment.setArguments(bundle);
getFragmentManager.beginTransaction.replace(R.id.frag_second,fragment).commit();
}
});
return view;
}
}
and here is another fragment with name FragmentTwo :
public class FragmentTwo extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
System.out.println("IN FRAGMENT TWO");
View view = inflater.inflate(R.layout.fragment_two,container,false);
Bundle bundle = getArguments();
if(bundle!= null)
{
String value = getArguments().getString("username");
}
return view;
}
#Override
public void onResume() {
super.onResume();
System.out.println("onResume gets called");
}
}
In the second fragment i am getting data buts its adding another view with previous one.
see the image :
so I want to pass data from FragmentOne to FragmentTwo in two scenario :
1. I want to pass the data when i click on button and
2. When I swipe to FragmentTwo data should be passed
Also when I try to swipe to FragmentTwo nothing gets called in FragmentTwo ? why is it so ?
Also when I click to second tab nothing gets called .
Please help me how should i pass data to FragmentTwo on button click ?
following are layout files:
here is fragment_one
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<EditText
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:id="#+id/et_name"
android:hint="Username"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:padding="16dp"
android:text="Send Data"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:id="#+id/btn_send"
android:layout_height="wrap_content"
android:layout_width="match_parent"/>
and second fragment , fragment_second.xml :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/second_frag"
android:gravity="center">
<TextView
android:textSize="24sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Fragment Two"
android:id="#+id/textView2" />

Each fragment is associated with the parent activity. so you can't directly communicate from one fragment to another fragment. You will need to go through Parent Activity using interface.
Check this docs : https://developer.android.com/training/basics/fragments/communicating.html
On button click pass the value to methods in your custom interface and access those methods in second fragment.
when I try to swipe to FragmentTwo nothing gets called in FragmentTwo
For this you need to implement fragment life cycle - https://developer.android.com/reference/android/app/Fragment.html
UPDATE
Done with some modification in you code, just look at the foll. code -
Manifex.xml
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity"
android:theme="#style/Theme.AppCompat.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
MainActivity.java
package com.app.onkar.tabdemo;
import android.support.v4.app.Fragment;
import android.support.design.widget.TabLayout;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
viewPager = (ViewPager) findViewById(R.id.viewpager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new FragmentOne(), "ONE");
adapter.addFragment(new FragmentTwo(), "TWO");
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(this);
tabLayout.setupWithViewPager(viewPager);
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
System.out.println("onPageSelected Called");
}
#Override
public void onPageScrollStateChanged(int state) {
}
public static class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
private static int count = 2;
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FragmentOne();
case 1:
return new FragmentTwo();
}
return null;
}
#Override
public int getCount() {
return count;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Tab One";
case 1:
return "Tab Two";
}
return null;
}
}
}
FragmentOne.java
package com.app.onkar.tabdemo;
import android.content.Context;
import android.net.Uri;
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;
import android.widget.EditText;
public class FragmentOne extends Fragment {
private EditText editText;
private Button btnSendData;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
System.out.println("IN FRAGMENT ONE");
View view = inflater.inflate(R.layout.fragment_one,container,false);
editText = (EditText) view.findViewById(R.id.et_name);
btnSendData = (Button) view.findViewById(R.id.btn_send);
btnSendData.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentTwo fragment = new FragmentTwo();
Bundle bundle = new Bundle();
bundle.putString("username",editText.getText().toString());
fragment.setArguments(bundle);
getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.second_frag,fragment).commit();
}
});
return view;
}
}
FragmentTwo.java
package com.app.onkar.tabdemo;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class FragmentTwo extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
System.out.println("IN FRAGMENT TWO");
View view = inflater.inflate(R.layout.fragment_two,container,false);
TextView txt2 = (TextView) view.findViewById(R.id.textView2);
Bundle bundle = getArguments();
if(bundle!= null)
{
String value = getArguments().getString("username");
txt2.setText(value);
}
return view;
}
#Override
public void onResume() {
super.onResume();
System.out.println("onResume gets called");
}
}
No change in Layout files. Just try above code - it is working exactly as you want. Hope it will help!
SCREENS

ViewPagerAdapter class
public class ViewPagerAdapter extends FragmentPagerAdapter {
private static int count = 2;
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
Fragment fragmentone = new FragmentOne();
Bundle args = new Bundle();
args.putInt("code", 1);
fragmentone.setArguments(args);
return fragmentone;
break;
case 1:
Fragment fragmenttwo = new FragmentTwo();
Bundle args = new Bundle();
args.putInt("code", 2);
fragmenttwo.setArguments(args);
return fragmenttwo ;
break;
}
return null;
}
#Override
public int getCount() {
return count;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position)
{
case 0 :
return "Tab One";
case 1 :
return "Tab Two";
}
return null;
}
}
args is the bundle object, you can put String int and other values to use these values in fragment use below code in onCreateView method of Fragment.
int codeForthisFragment = getArguments().getInt("code");
for button click:
FragmentTransaction ft = getFragmentManager().beginTransaction();
Fragment secondFragment = new FragmentTwo();
Bundle args = new Bundle();
args.putInt("code", 2);
secondFragment.setArguments(args);
ft.replace(R.id.content_frame, secondFragment);
ft.commit();

In the second fragment i am getting data buts its adding another view with previous one. see the image
With reference to the answer by #Roy Miller(https://stackoverflow.com/users/5255021/roy-miller),
you can solve it by doing the follwing changes:
In MainActivity.java ,replace the follwing switch:
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FragmentOne();
case 1:
return new FragmentTwo();
}
return null;
}
With:
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
return mFragmentList.get(0);
case 1:
return mFragmentList.get(1);
case 2:
return mFragmentList.get(2);
default:
return null;
}
}
And then, in FragmentOne.java
Replace this:
btnSendData.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentTwo fragment = new FragmentTwo();
Bundle bundle = new Bundle();
bundle.putString("username",editText.getText().toString());
fragment.setArguments(bundle);
getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.second_frag,fragment).commit();
}
});
With:
btnSendData.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
/*This one FragmentCollection is a Singleton class that contains list of fragments, set it during initialization itself(code is attached below this code)*/
FragmentCollection fragmentCollection=FragmentCollection.getInstance();
FragmentTwo fragment = (FragmentTwo) FragmentCollection.getmFragmentList().get(2); //getting the second fragment
fragment.setText(editText.getText().toString()); //add this method in fragment two
}
});
Now inside FragmentTwo.java
Add the method:
public void updateTextView(String data){
Log.d("TabTwo","Update Text view");
TextView txt = (TextView)view.findViewById(R.id.textView2);
txt.setText(data);
}
At last, the singleton class i mentioned above:
public class FragmentCollection {
static FragmentCollection fragmentCollection=new FragmentCollection();
private final List<Fragment> mFragmentList = new ArrayList<>();
private FragmentCollection(){}
public static FragmentCollection getInstance(){
if(fragmentCollection!=null) {
return fragmentCollection;
}else {
return new FragmentCollection();
}
}
public void setmFragmentList(List<Fragment> mFragmentList){
this.mFragmentList.addAll(mFragmentList);
}
public List<Fragment> getmFragmentList(){
return mFragmentList;
}
}
The issue of getting older views overlapping is because of initializing the fragment again and again
like new FragmentTwo(); in more than one place.
So here we put it in a list and access it so only a single fragment is altered.

I am not able to go to first fragment from Second fragment . I am using tab layout
This is my code
By clicking button from 2nd Fragment
Bundle bundle = new Bundle();
bundle.putString("uniqueList1", uniqueList.get(0));
bundle.putString("uniqueList2", uniqueList.get(1));
bundle.putString("kycUniquesNo", kycUniqueNum);
CustBasicFormFragement fragObj = new CustBasicFormFragement();
fragObj.setArguments(bundle);
In 1st Fragment
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle
savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
binding = DataBindingUtil.inflate(inflater, R.layout.cust_basic_form_fragment, container, false);
view = binding.getRoot();
if (getArguments() != null) {
string1 = getArguments().getString("uniqueList1");
string2 = getArguments().getString("uniqueList2");
kycUnique=getArguments().getString("kycUniquesNo");
System.out.print(string1);
System.out.print(string2);
System.out.print(kycUnique);
return view;
}

Pass String to a fragment from an Activity

I need to pass some values to the fragment from an Activity class.
I tried passing the bundle to the fragment but got null.
I need to receive the values and then run an AsyncTask in the fragment activity.
Code snippet FirstFragment.java:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
v = inflater.inflate(R.layout.first_frag, container, false);
Bundle bundle = getArguments();
if(bundle!=null)
{
sensorUID=getArguments().getString("senID");
System.out.println("we got this: " + sensorUID);
}
System.out.println("we got this2: "+ sensorUID);
new MyAsyncTask().execute();
return v;
}
Code (activity class):
package test.sensorv2;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
public class scatter extends FragmentActivity {
protected String sensorUID;
protected String tankname;
protected String SCALE_M;
protected String SCALE_C;
protected String DPs;
protected String UNITs;
String np;
int k = 0;
float m;
float c;
int numVar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scatter);
sensorUID = getIntent().getStringExtra("sUID");
tankname = getIntent().getStringExtra("tNAME");
SCALE_C = (getIntent().getStringExtra("tSCALEC"));
SCALE_M = (getIntent().getStringExtra("tSCALEM"));
DPs = (getIntent().getStringExtra("tDP"));
UNITs = (getIntent().getStringExtra("tUNIT"));
numVar = Integer.parseInt(DPs);
Bundle b=new Bundle();
b.putString("key", sensorUID);
FirstFragment f=new FirstFragment();
f.setArguments(b);
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 SecondFragment.newInstance("SecondFragment, Instance 1");
default:
return ThirdFragment.newInstance("ThirdFragment, Default");
}
}
#Override
public int getCount() {
return 3;
}
}
}

#Override
public Fragment getItem(int pos) {
Fragment fragment;
Bundle args = new Bundle();
args.putString("sendID", sensorUID);
switch (pos) {
case 0:
fragment = FirstFragment.newInstance("FirstFragment, Instance 1");
break;
case 1:
fragment = SecondFragment.newInstance("SecondFragment, Instance 1");
break;
default:
fragment = ThirdFragment.newInstance("ThirdFragment, Default");
}
fragment.setArguments(args);
return fragment;
}
Then you can retrieve the arguments in your fragment using `getArguments.getString("sendID");
Or you can just pass your ID as a parameter in newInstance like this fragment = FirstFragment.newInstance(senId); and in new Instance you pass the data from newInstance to onCreateview like this :
public static Fragment newInstance(String senID){
FirstFragmentf = new FirstFragment();
Bundle args = new Bundle();
args.putString("senID", sendID);
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sensorID= getArguments().getString("sendID");
}

Create a field in the fragment:
public Bundle bundle;
and in the mainactivity assign your bundle to
f.bundle=b;
and delete
Bundle bundle=getArguments();

In your activity put:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Actiity to Fragment
Bundle bundle = new Bundle();
bundle.putString("test", "From Activity");
// set Fragmentclass Arguments
TestFragment testFragment = new TestFragment();
testFragment.setArguments(bundle);
testFragment.myTest();
}
In your Fragment put:
public void myTest(){
//Get String from Activity
String stringText = getArguments().getString("test");
Log.d(LOG_TAG, "The String from the Activity = " + stringText);
}