Replace fragmentA with fragmentB issue

Replace fragmentA with fragmentB issue - android

I have a image in the main activity and when this image is clicked i want to show the fragmentA that has a list view.
When a item of this listView is clicked i want to replace the fragmentA by the fragmentB that has a textview, and I want to show in this textview the text associated to the clicked list item.
So in main activity I have this:
public class MainActivity extends AppCompatActivity implements Listener{
private ImageView img;
private String text;
FragmentManager fragmentManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getFragmentManager();
img = (ImageView) findViewById(R.id.imageView);
}
public void AddFragmentA(View view) {
FragmentA fragmentA = new FragmentA();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.containerFragmentA, new FragmentA(), "fragA");
transaction.commit();
}
public void AddFragmentB() {
FragmentB fragment = new FragmentB();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.containerFragmentB, new FragmentA(), "fragB");
transaction.commit();
}
#Override
public void addText(String text) {
this.text = text;
Toast.makeText(this, "Text received in Activity:" +text, Toast.LENGTH_SHORT).show();
sendDataToFragmentB();
}
public void sendDataToFragmentB(){
FragmentB fragmentB = (FragmentB) fragmentManager.findFragmentByTag("fragB");
fragmentB.addText(text);
}
}
Note: The toast in addText() appears with the correct text at this point, so the text of the list view is received in Activity with success.
Question: Now how to replace fragmentA with fragmentB and show the textview with the received text in the activity instead of showing the listview of the fragmentA?
Below is all the complete example.
FragmentA class:
public class FragmentA extends Fragment{
private ListView listItems;
private String[] items = {
"item1",
"item2",
"item3",
"item4"
};
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment, container, false);
return view;
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
listItems = (ListView) getView().findViewById(R.id.listviewInFragment);
ArrayAdapter<String> adapter =
new ArrayAdapter<String>(getActivity().getApplicationContext(),
android.R.layout.simple_list_item_1, android.R.id.text1, items);
listItems.setAdapter(adapter);
listItems.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
int positionCode = i;
String clickedValue = (String) adapterView.getItemAtPosition(i);
Listener listener = (Listener) getActivity();
listener.addText(clickedValue);
}
});
}
}
FramentB:
public class FragmentB extends Fragment {
private TextView tv;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_b, container, false);
tv = (TextView) getView().findViewById(R.id.textView);
return view;
}
public void addText(String text) {
String result = text;
tv.setText(result);
}
}
main activity xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#drawable/image"
android:onClick="AddFragmentA"
tools:layout_editor_absoluteX="0dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp" />
<FrameLayout
android:id="#+id/containerFragmentA"
android:layout_width="0dp"
android:layout_height="300dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.0"
tools:layout_editor_absoluteY="1dp">
</FrameLayout>
<FrameLayout
android:id="#+id/containerFragmentB"
android:layout_width="0dp"
android:layout_height="300dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.0"
tools:layout_editor_absoluteY="1dp">
</FrameLayout>
</android.support.constraint.ConstraintLayout>
fragment a xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0ff">
<ListView
android:layout_width="368dp"
android:layout_height="495dp"
android:layout_marginLeft="8dp"
android:layout_marginStart="16dp"
android:id="#+id/listviewInFragment"/>
</android.support.constraint.ConstraintLayout>
fragment b xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ff0">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="300dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
/>
</android.support.constraint.ConstraintLayout>

This is how you will achieve the required task.
make chnages to your class accordingly below.
MainActivity.java
public class MainActivity extends AppCompatActivity implements FragmentA.ClickListener{
private Button button;
public static String EXTRA_STRING = "extraString";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button)findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
AddFragment(FragmentA.getInstance());
}
});
}
public void AddFragment(Fragment fragment) {
getSupportFragmentManager().beginTransaction().replace(R.id.containerFragmentA, fragment).commit();
}
#Override
public void onClick(String data) {
AddFragment(FragmentB.getInstance(data));
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/containerFragmentA"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
tools:layout_editor_absoluteY="1dp"/>
<Button
android:id="#+id/button"
style="#style/Widget.AppCompat.Button.Colored"
android:layout_margin="8dp"
android:layout_alignParentBottom="true"
android:text="Add Fragment B"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
FragmentA.java
public class FragmentA extends Fragment {
private ListView listItems;
private String[] items = {"item1", "item2", "item3", "item4"};
private ClickListener clickListener;
public static FragmentA getInstance() {
return new FragmentA();
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
clickListener = (ClickListener)context;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_a, container, false);
return view;
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
listItems = (ListView) getView().findViewById(R.id.listviewInFragment);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getContext(),android.R.layout.simple_list_item_1, items);
listItems.setAdapter(adapter);
listItems.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String clickedValue = items[i];
clickListener.onClick(clickedValue);
}
});
}
public interface ClickListener{
void onClick(String data);
}
}
fragment_a.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="368dp"
android:layout_height="495dp"
android:layout_marginLeft="8dp"
android:layout_marginStart="16dp"
android:id="#+id/listviewInFragment"/>
</android.support.constraint.ConstraintLayout>
FragmentB.java
public class FragmentB extends Fragment {
private TextView tv;
private String data;
public static FragmentB getInstance(String data){
Bundle bundle = new Bundle();
bundle.putString(MainActivity.EXTRA_STRING,data);
FragmentB fragmentB = new FragmentB();
fragmentB.setArguments(bundle);
return fragmentB;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_b, container, false);
tv = view.findViewById(R.id.textView);
data = getArguments().getString(MainActivity.EXTRA_STRING);
addText(data);
return view;
}
public void addText(String text) {
String result = text;
tv.setText(result);
}
}
fragment_b.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_gravity="center"
android:gravity="center"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:gravity="center"
android:textSize="24dp"
android:textAppearance="#style/TextAppearance.AppCompat.Widget.PopupMenu.Header"
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>

you are placing fragment A in below function instead of fragment B
public void AddFragmentB() {
FragmentB fragment = new FragmentB();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.containerFragmentB, new FragmentA(), "fragB");
transaction.commit();
}
it should be
public void AddFragmentB() {
FragmentB fragment = new FragmentB();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.containerFragmentB, new FragmentB(), "fragB");
transaction.commit();
}
if you want to replace a fragment with another just use the same container
don't create separate (R.id.containerFragmentB, R.id.containerFragmentA) container.

You need to change your
public void AddFragmentA(View view) {
FragmentA fragmentA = new FragmentA();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.containerFragmentA, new FragmentA(), "fragA");
transaction.commit();
}
public void AddFragmentB() {
FragmentB fragment = new FragmentB();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.containerFragmentB, new FragmentA(), "fragB");
transaction.commit();
}
to
public void AddFragmentA(View view) {
FragmentA fragmentA = new FragmentA();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.container, fragmentA , "fragA");
transaction.commit();
}
public void AddFragmentB() {
FragmentB fragment = new FragmentB();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.container, fragment, "fragB");
transaction.commit();
}
and activity_main.xml should be
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#drawable/image"
android:onClick="AddFragmentList"
tools:layout_editor_absoluteX="0dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp" />
<FrameLayout
android:id="#+id/container"
android:layout_width="0dp"
android:layout_height="300dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.0"
tools:layout_editor_absoluteY="1dp">
</FrameLayout>
</android.support.constraint.ConstraintLayout>
EDIT
listItems.setAdapter(adapter);
listItems.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
int positionCode = i;
String clickedValue = (String) adapterView.getItemAtPosition(i);
Listener listener = (Listener) getActivity();
listener.addText(clickedValue);
}
});
Listener
public interface IScanner {
void addText(String Text);
}
MainActivity
public class MainActivity extends AppCompatActivity implements Listener{
private ImageView img;
private String text;
FragmentManager fragmentManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getFragmentManager();
img = (ImageView) findViewById(R.id.imageView);
}
public void AddFragmentA(View view) {
FragmentA fragmentA = new FragmentA();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.containerFragmentA, new FragmentA(), "fragA");
transaction.commit();
}
#Override
public void addText(String text) {
this.text = text;
Toast.makeText(this, "Text received in Activity:" +text, Toast.LENGTH_SHORT).show();
sendDataToFragmentB(text);
}
public void sendDataToFragmentB(String clickedValue){
Bundle b = new Bundle();
b.putString("clickedValue", clickedValue);
FragmentB fragment = new FragmentB();
fragment.setArguments(b);
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.containerFragmentB, new FragmentA(), "fragB");
transaction.commit();
}
}
FragmentB
public class FragmentB extends Fragment {
private TextView tv;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_b, container, false);
tv = (TextView) getView().findViewById(R.id.textView);
return view;
}
Bundle bundle = this.getArguments();
if (bundle != null) {
String text = bundle.getString("clickedValue", "");
}
}
This will solve your problem

Related

Fragment view is not outputting

I have a fragment called TabFragment, which contains an ImageAdapter. Now the ImageAdapter will create an imageView which I attached an onclick listener to it. Once the imageView is clicked I would like to open the DetailsFragment fragment. However open pressing upon the imageView, the Toast messages are shown meaning that the specific fragments are accessed, but the actual view of the fragment is not.
ImageAdapter class
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private FragmentManager fragmentManager;
public ImageAdapter(Context c,FragmentManager fm) {
mContext = c;
fragmentManager = fm;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(final int position, final View convertView, final ViewGroup parent)
{
ImageView imageView;
if(convertView == null)
{
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(300,300));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8,8,8,8);
}
else
{
imageView = (ImageView) convertView;
}
imageView.setImageURI(mThumbIds[position]);
//check for tap
if(imageView.getDrawable() != null)
{
imageView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(mContext, "clicked", Toast.LENGTH_SHORT).show();
Fragment detailsFragment = new DetailsFragment();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.container,detailsFragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
});
}
return imageView;
}
private Uri[] mThumbIds = new Uri[20];
public void setUriArr(Uri[] uriArr){
this.mThumbIds = uriArr;
}
}
DetailsFragment Class
public class DetailsFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_details, container, false);
Toast.makeText(getContext(), "entered fragment", Toast.LENGTH_SHORT).show();
return view;
}
}
TabFragment fragment [just in case]
public class TabFragment extends Fragment{
View rootView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
rootView = inflater.inflate(R.layout.fragment_tab, container, false);
LoadGridView(rootView);
return rootView;
}
#Override
public void onResume() {
super.onResume();
LoadGridView(rootView);
}
public void LoadGridView(View v){
GridView gridview = (GridView) v.findViewById(R.id.grdvwImages);
ImageAdapter ia = new ImageAdapter(getActivity(),getFragmentManager());
int i = 0;
Uri[] imageArray = new Uri[20];
int pos = getArguments().getInt("position", 0);
//DeleteAll();
List<GalleryModel> news = GetNewsArticles(pos);
if(news.size() != 0){
for(GalleryModel n:news){
imageArray[i] = Uri.parse(n.imageDir);
i++;
}
ia.setUriArr(imageArray);
}
gridview.setAdapter(ia);
}
public List<GalleryModel> GetNewsArticles(int position){
return new Select()
.from(GalleryModel.class)
.where("Section = ?", position)
.execute();
}
public void DeleteAll()
{
new Delete().from(GalleryModel.class).execute();
}
}
fragment_details.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.jerome_pc.myfirstapp.PortalActivity">
<RelativeLayout
android:background="#android:color/white"
android:layout_width="395dp"
android:layout_height="587dp"
tools:layout_editor_absoluteX="-5dp"
tools:layout_editor_absoluteY="-1dp">
<EditText
android:id="#+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button"
android:layout_alignStart="#+id/button"
android:layout_below="#+id/editText2"
android:layout_marginTop="30dp"
android:ems="10"
android:hint="Post Description"
android:inputType="textPersonName" />
<EditText
android:id="#+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="47dp"
android:ems="10"
android:hint="Post Title"
android:inputType="textPersonName"
android:layout_alignParentTop="true"
android:layout_alignLeft="#+id/editText"
android:layout_alignStart="#+id/editText" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="200dp"
android:layout_height="200dp"
app:srcCompat="#android:drawable/ic_menu_gallery"
android:layout_centerVertical="true"
android:layout_alignLeft="#+id/editText"
android:layout_alignStart="#+id/editText" />
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="75dp"
android:layout_marginStart="75dp"
android:layout_marginTop="33dp"
android:onClick="btnCancelOnClick"
android:text="Cancel"
android:layout_below="#+id/imageView3"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="btnSubmitOnClick"
android:text="Submit"
android:layout_alignBaseline="#+id/button"
android:layout_alignBottom="#+id/button"
android:layout_toRightOf="#+id/button"
android:layout_toEndOf="#+id/button"
android:layout_marginLeft="51dp"
android:layout_marginStart="51dp" />
</RelativeLayout>
</android.support.constraint.ConstraintLayout>

replace instead of add
Fragment detailsFragment = new DetailsFragment();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container,detailsFragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
EDIT: remove absolute x and y from relativelayout
<RelativeLayout
android:background="#android:color/white"
android:layout_width="395dp"
android:layout_height="587dp">
and check your version of constraint-layout in gradle
EDIT2: organize your code
create click listener for the image in the imageadapter like this:
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private FragmentManager fragmentManager;
private ImageAdapterClick imageAdapterListener;
public interface ImageAdapterClick {
void isClicked();
}
public ImageAdapter(Context c,FragmentManager fm, ImageAdapterClick imageAdapterListener) {
mContext = c;
fragmentManager = fm;
this.imageAdapterListener = imageAdapterListener;
}
then change local listener in the getView method
imageView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
imageAdapterListener.isClicked();
}
});
then in your TabFragment change the adapter in the way which would call that details fragment
ImageAdapter ia = new ImageAdapter(getActivity(),getFragmentManager(), new
ImageAdapter.ImageAdapterClick (){
#Override
public void isClicked() {
Fragment detailsFragment = new DetailsFragment();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container,detailsFragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
});

Sending data from Fragment to Fragment using Interface, by setting Fragment Layouts dynamically. Saved instance of Fragment NOT working

I am sending data from one fragment to another, using interface. This works absolutely fine. Now I am trying to use onSaveInstanceState() to save the value in
a Fragment and retrieving in onCreate(). however i'm getting null in Bundle of onCreate(). P.S. everything works fine when i set the Fragment directly into the activity layout in xml. but when i set the fragment through java code into the activity, the onSaveInstanceState is failing. It is not saving the last known value. Please help. Pasting the code below. You can try it out to know the exact issue.
Fragment_A :
public class Fragment_A extends Fragment implements View.OnClickListener {
Button btnAdd;
int counter = 0;
Communicator comm;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(savedInstanceState != null){
counter = savedInstanceState.getInt("counter", 0);
}
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_a, container, false);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
comm = (Communicator) getActivity();
btnAdd = (Button) getActivity().findViewById(R.id.btnAdd);
btnAdd.setOnClickListener(this);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("counter", counter);
}
#Override
public void onClick(View v) {
counter++;
comm.sendData(counter);
}
}
interface Communicator{
void sendData(int i);
}
=====
Activity :
public class Activity_InterComm extends Activity implements Communicator{
FragmentManager manager;
FragmentTransaction transaction;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_intercomm);
Fragment_A fragment_1 = new Fragment_A();
Fragment_B fragment_2 = new Fragment_B();
manager = getFragmentManager();
transaction = manager.beginTransaction();
transaction.add(R.id.frag_a, fragment_1, "Frag1");
transaction.add(R.id.frag_b, fragment_2, "Frag2");
transaction.commit();
}
#Override
public void sendData(int i) {
manager = getFragmentManager();
Fragment_B fragment_b = (Fragment_B) manager.findFragmentById(R.id.frag_b);
fragment_b.setData("Button has been clicked " + i + " times");
}
}
=====
Fragment_B :
public class Fragment_B extends Fragment {
TextView txtMessage;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_b, container, false);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
txtMessage = (TextView) getActivity().findViewById(R.id.txtMessage);
}
public void setData(String message){
txtMessage.setText(message);
}
}
activity_intercomm.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!--<fragment
android:id="#+id/frag_a"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_weight="1"
android:name="android.learning.com.fragintercomm.Fragment_A"/>
<fragment
android:id="#+id/frag_b"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:name="android.learning.com.fragintercomm.Fragment_B"/>-->
<LinearLayout
android:id="#+id/frag_a"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_weight="1"
android:background="#color/colorAccent"
android:orientation="vertical"/>
<LinearLayout
android:id="#+id/frag_b"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_weight="1"
android:background="#color/colorPrimaryDark"
android:orientation="vertical"/>
</LinearLayout>

the soluion I found was using getView() instead of getActivity() while initializing the button in Fragment_A. use btnAdd = (Button) getView().findViewById(R.id.btnAdd); instead of btnAdd = (Button) getActivity().findViewById(R.id.btnAdd);.
However, you can't use getView() in Fragment_B. The Textview freezes and, onSaveInstanceStat() doesn't work. Please suggest a solution.

In a fragment implementation, the ListView below EditText disappears after setting keypad element (of EditText view) to hide

this is image while useing keypad
and this image after keypad was hidden
I use EditText but below it there is ListView. After typing text inputs in EditText and then press done or click back to hide keypad. Then the part of ListView behind the keypad disappeared and replaced by white area (cleared), why ?
NOTE: this fragment is under tablayout and viewpager and the fragment which contain the edit text and listview is launched from the main fragment
this is main fragment
public class FriendsFragment extends Fragment {
public FriendsFragment() {
// Required empty public constructor
}
private FragmentActivity myContext;
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public void onAttach(Activity activity) {
myContext=(FragmentActivity) activity;
super.onAttach(activity);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootview=inflater.inflate(R.layout.friends_fragment, container, false);
viewPager = (ViewPager) rootview.findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) rootview.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(
new TabLayout.ViewPagerOnTabSelectedListener(viewPager) {
#Override
public void onTabSelected(TabLayout.Tab tab) {
super.onTabSelected(tab);
if (tab.getPosition() == 1) {
FindFriendsFragment.myfriends_list.invalidate(FindFriendsFragment.myfriends_list.getLeft(), FindFriendsFragment.myfriends_list.getTop(), FindFriendsFragment.myfriends_list.getRight(), FindFriendsFragment.myfriends_list.getBottom());
FindFriendsFragment.adapter.notifyDataSetChanged();
FindFriendsFragment.myfriends_list.clearFocus();
FindFriendsFragment.myfriends_list.postInvalidate();
}
}
});
TextView friends = (TextView) rootview.findViewById(R.id.search);
Typeface Exo_thin = Typeface.createFromAsset(myContext.getAssets(), "fonts/Exo2.0-Thin.otf");
friends.setTypeface(Exo_thin);
return rootview;
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager());
adapter.addFragment(new MyFriendsFragment(), "My Friends");
adapter.addFragment(new FindFriendsFragment(), "Find Friends");
adapter.addFragment(new TwoFragment(), "Friend Requests");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = 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, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
this is xml of main fragment
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:clickable="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
android:id="#+id/rel"
android:layout_alignParentTop="true"
android:weightSum="1">
<TextView
android:layout_width="match_parent"
android:layout_height="60dp"
android:id="#+id/search"
android:text="Friends"
android:layout_marginLeft="10dp"
android:gravity="center_vertical"
android:textSize="25sp"
android:textColor="#color/colorVeryDarkBlue"
/>
</RelativeLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabTextAppearance="#android:style/TextAppearance.Widget.TabWidget"
app:tabSelectedTextColor="#color/colorLightGreen"
app:tabTextColor="#color/colorDarkGreen"
app:tabMode="scrollable"
android:background="#color/colorDarkBlue"
app:tabIndicatorColor="#color/colorDarkBlue"
app:tabGravity="center"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
the fragment which contain listview and edit text
public class FindFriendsFragment extends Fragment {
public FindFriendsFragment()
{
// Required empty public constructor
}
ListView myfriends_list;
FindFriendsAdapter adapter;
ArrayList<FindFriends> arraylist ;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View rootview= inflater.inflate(R.layout.find_friends_fragment, container, false);
EditText search=(EditText) rootview.findViewById(R.id.search);
Typeface Exo_Regular =
Typeface.createFromAsset(getActivity().getAssets(), "fonts/Exo2.0-
Regular.otf");
search.setTypeface(Exo_Regular);
arraylist = new ArrayList<FindFriends>();
arraylist.add(new FindFriends("mina fared", "hello
guys",1,"sdsdsdsds",true )) ;
adapter = new FindFriendsAdapter(getActivity(), arraylist);
myfriends_list.setAdapter(adapter);
adapter.notifyDataSetChanged();
return rootview;
}
}
And the related xml file is of the fragment which contain listview and edittext:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:background="#ffffff"
>
<LinearLayout
android:layout_height="60dp"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_marginTop="111dp"
android:id="#+id/refl"
android:background="#color/colorLightGrey"
android:layout_alignParentTop="true"
>
<EditText
android:layout_width="match_parent"
android:layout_height="40dp"
android:id="#+id/search"
android:layout_marginRight="15dp"
android:layout_marginLeft="15dp"
android:background="#ffffff"
android:singleLine="true"
android:hint="Search"
android:ellipsize="start"
android:imeOptions="actionDone"
android:gravity="center_vertical|center_horizontal"
android:layout_marginTop="10dp"
android:textSize="15sp"
android:textColorHint="#color/colormyhintfindfiernds"
android:textColor="#color/colorDarkBlue"
/>
</LinearLayout>
<ListView
android:id="#+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:layout_marginTop="1dp"
android:layout_below="#+id/refl"
android:divider="#ffffff"
android:dividerHeight="1.5dp"
/>
</RelativeLayout>
this is the parent fragment which contains all fragments
public class ProfileFragment extends Fragment {
public ProfileFragment()
{
// Required empty public constructor
}
RelativeLayout rl1;
DrawView drawView ;
DrawView drawView2;
TextView myprofile,username,notification_txt,colloection_txt,friends_txt,setting_txt,public_profile_txt;
ImageView public_profile_btn,friends;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View rootview=inflater.inflate(R.layout.myprofile_fragment, container,
false);
username= (TextView) rootview.findViewById(R.id.user_name_txt);
myprofile= (TextView) rootview.findViewById(R.id.myprofile);
notification_txt= (TextView) rootview.findViewById(R.id.notification_txt);
colloection_txt= (TextView) rootview.findViewById(R.id.colloection_txt);
friends_txt= (TextView) rootview.findViewById(R.id.friends_txt);
setting_txt= (TextView) rootview.findViewById(R.id.setting_txt);
public_profile_txt= (TextView) rootview.findViewById(R.id.public_profile_txt);
Typeface Exo_thin = Typeface.createFromAsset(getActivity().getAssets(), "fonts/Exo2.0-Thin.otf");
Typeface Exo_SemiBold = Typeface.createFromAsset(getActivity().getAssets(), "fonts/Exo2.0-SemiBold.otf");
myprofile.setTypeface(Exo_thin);
username.setTypeface(Exo_SemiBold);
notification_txt.setTypeface(Exo_SemiBold);
colloection_txt.setTypeface(Exo_SemiBold);
friends_txt.setTypeface(Exo_SemiBold);
setting_txt.setTypeface(Exo_SemiBold);
public_profile_txt.setTypeface(Exo_SemiBold);
ImageView x=(ImageView)rootview.findViewById(R.id.colloection);
ImageView y=(ImageView)rootview.findViewById(R.id.friends);
ImageView x1=(ImageView)rootview.findViewById(R.id.setting);
rl1 =(RelativeLayout)rootview.findViewById(R.id.rel2);
final View fragmentContainer = rootview.findViewById(R.id.container);
friends =(ImageView)rootview.findViewById(R.id.friends);
public_profile_btn=(ImageView)rootview.findViewById(R.id.public_profile);
public_profile_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view)
{
Fragment newFragment = new MyProfileFragment();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(fragmentContainer.getId(), newFragment);
transaction.addToBackStack(null);
transaction.commit();
}
});
friends.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view)
{
Fragment newFragment = new FriendsFragment();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(fragmentContainer.getId(), newFragment);
transaction.addToBackStack(null);
transaction.commit();
}
});
return rootview;
}
}

from manifest.xml search for your activity tag like this
<activity
android:name=".YourActivity"
android:label="#string/title_activity"
...>
</activity>
then add android:configChanges="keyboard|keyboardHidden" like that
<activity
android:name=".YourActivity"
android:configChanges="keyboard|keyboardHidden"
android:label="#string/title_activity"
...>
</activity>
EDIT
i found that my answer not completely right you may add
android:windowSoftInputMode="adjustNothing"
sorry about that

ViewPage Fragment disappear when reload again

The following is layout
test.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="Click"
android:id="#+id/button"
/>
<!-- Framelayout to display Fragments -->
<FrameLayout
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
test_detail.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Hello"
android:id="#+id/textView" android:layout_gravity="center_horizontal"/>
</LinearLayout>
common_view_pager_layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/MainViewerPage"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<android.support.v4.view.PagerTabStrip
android:id="#+id/TitlePageTabStrip"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.v4.view.ViewPager>
</LinearLayout>
The following is my Activity code
public class TestFragmentActivity extends FragmentActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.test);
Button button = (Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, new HomeFragment()).commit();
}
});
}
public class HomeFragment extends Fragment {
private PagerAdapter _adapter;
public HomeFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.common_view_pager_layout, container, false);
this._adapter = new PagerAdapter(TestFragmentActivity.this);
this._adapter.add(new DetailFragment());
ViewPager pager = (ViewPager) view.findViewById(R.id.MainViewerPage);
pager.setAdapter(this._adapter);
return view;
}
}
public class DetailFragment extends Fragment {
public DetailFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.test_detail, container, false);
return rootView;
}
}
public class PagerAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> _fragments;
public PagerAdapter(FragmentActivity activity) {
super(activity.getSupportFragmentManager());
this._fragments = new ArrayList<Fragment>();
}
public void add(Fragment fragment) {
this._fragments.add(fragment);
}
#Override
public Fragment getItem(int position) {
return this._fragments.get(position);
}
#Override
public CharSequence getPageTitle(int position) {
return "Test";
}
#Override
public int getCount() {
return 1;
}
}
}
When I click a button the fragment in ViewPager was display
But when I click the button again the fragment disappear
Please help me.

try using this:
in the constructor of your adapter change this :
public class MyPagerAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> _fragments;
public MyPagerAdapter(FragmentManager activity) {
super(activity);
this._fragments = new ArrayList<Fragment>();
}
public void add(Fragment fragment) {
this._fragments.add(fragment);
}
#Override
public Fragment getItem(int position) {
return this._fragments.get(position);
}
#Override
public CharSequence getPageTitle(int position) {
return "Test";
}
#Override
public int getCount() {
return 1;
}
}
and when you want to create the adapter send getChildFragmentManager() to its constructor
public class HomeFragment extends Fragment {
private MyPagerAdapter _adapter;
public HomeFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.common_view_pager_layout, container, false);
ViewPager pager = (ViewPager) view.findViewById(R.id.MainViewerPage);
this._adapter = new MyPagerAdapter(getChildFragmentManager());
this._adapter.add(new DetailFragment());
pager.setAdapter(this._adapter);
return view;
}
}
I test it and it works, any problem comment it.
Good Luck!

In your Fragment class, in the onCreate() method, you have to call setRetainInstance(true) like this:
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
This tells the FragmentManager to keep your fragments on reloads.
In addition, check your manifest file doesn't have any
android:screenOrientation
config changes where you are basically saying you will handle reloads due to config changes yourself.

In PagerFragment 's onResume() add this:
#Override
public void onResume() {
super.onResume();
for (Fragment fragment : getFragmentManager().getFragments()) {
if (fragment instanceof Tab1Fragment || fragment instanceof Tab2Fragment) {
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.detach(fragment);
ft.attach(fragment);
ft.commit();
}
}
}

Try to add this lines in your code:
public int getItemPosition(Object object) {
return POSITION_NONE;
}
and Add the below lines
pager.setOnPageChangeListener(new OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
... anything you may need to do to handle pager state ...
adapter.notifyDataSetChanged(); //this line will force all pages to be loaded fresh when changing between fragments
}
Under
pager.setAdapter(adapter);
Hope this may help you!

Ensure you pass the adapter instance the child fragment manager, not the fragment manager.
Like this:
this._adapter = new PagerAdapter(getChildFragmentManager());

How to use same fragment in a viewPager?

I develope currently a small sample app with fragments and a viewPager. The viewPager shows 3 pages. In each page i instantiate a fragment of the same type. The fragment contains a textView and a button. On button click I want to replace the current fragment with another one. Now my problem is, no matter which button I press only the fragment of page 1 gets replaced. I dont know what I have to do in my pageAdapter class but I guess it has to do with using the same fragment and layout. I think I have to make sure, that my pageAdapter updates the correct page, but how do I achieve that?
For a better understanding why I want to achieve that, that I receive a json string within 3 node of type menu and I want to use each of them as a page in my viewPager.
Can someone show me a short and easy example for such a behavior? I think its a basic approach, so it cant be so difficult.
--------Edit---------
Here is the code:
public class FragmentPagerSupport extends FragmentActivity {
static final int NUM_ITEMS = 4;
MyAdapter mAdapter;
ViewPager mPager;
#Override
public void onBackPressed() {
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
fm.popBackStack();
} else {
super.onBackPressed();
}
}
public MyAdapter getmAdapter() {
return mAdapter;
}
public ViewPager getmPager() {
return mPager;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_pager);
mAdapter = new MyAdapter(getFragmentManager(), this);
mPager = (ViewPager) findViewById(R.id.pager);
mPager.setOffscreenPageLimit(NUM_ITEMS + 2);
mPager.setAdapter(mAdapter);
Button button = (Button) findViewById(R.id.goto_first);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mPager.setCurrentItem(0);
}
});
button = (Button) findViewById(R.id.goto_last);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mPager.setCurrentItem(NUM_ITEMS - 1);
}
});
}
}
MyAdapter:
public MyAdapter(FragmentManager fm, FragmentPagerSupport fragmentPagerSupport) {
super(fm);
this.fragmentPagerSupport = fragmentPagerSupport;
}
#Override
public int getCount() {
return NUM_ITEMS;
}
#Override
public Fragment getItem(int position) {
Fragment newInstance = null;
switch (position) {
case 0:
newInstance = frag1.newInstance(position);
break;
case 1:
newInstance = frag1.newInstance(position);
break;
case 2:
newInstance = frag2.newInstance(position);
break;
case 3:
newInstance = frag2.newInstance(position);
break;
}
return newInstance;
}
Frag1 & Frag2 & ListItemFrag:
public static class frag1 extends ListFragment {
int mNum;
static frag1 newInstance(int num) {
frag1 f = new frag1();
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;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
v.setId(mNum);
View tv = v.findViewById(R.id.text);
((TextView) tv).setText("Fragment #" + mNum);
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
String[] cheeses = { "Edamer", "Gauda", "Cheddar", "Mozarella", "Maasdamer" };
setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, cheeses));
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
Log.i("FragmentList", "Item clicked: " + id);
String itemName = (String) l.getItemAtPosition(position);
Fragment listItemFragment = ListItemFragment.newInstance(itemName);
FragmentTransaction trans = getActivity().getFragmentManager().beginTransaction();
trans.replace(R.id.root, listItemFragment, listItemFragment.getClass().getName() + "_" + mNum);
trans.addToBackStack(itemName);
trans.commit();
}
}
public static class frag2 extends ListFragment {
int mNum;
static frag2 newInstance(int num) {
frag2 f = new frag2();
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;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
v.setId(mNum);
View tv = v.findViewById(R.id.text);
((TextView) tv).setText("Fragment #" + mNum);
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
String[] cheeses = { "Edamer", "Gauda", "Cheddar", "Mozarella", "Maasdamer" };
setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, cheeses));
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
Log.i("FragmentList", "Item clicked: " + id);
String itemName = (String) l.getItemAtPosition(position);
Fragment listItemFragment = ListItemFragment.newInstance(itemName);
FragmentTransaction trans = getActivity().getFragmentManager().beginTransaction();
trans.replace(R.id.root, listItemFragment, listItemFragment.getClass().getName() + "_" + mNum);
trans.addToBackStack(itemName);
trans.commit();
}
}
public static class ListItemFragment extends Fragment {
String itemName;
static ListItemFragment newInstance(String itemName) {
ListItemFragment i = new ListItemFragment();
Bundle args = new Bundle();
args.putString("text", itemName);
i.setArguments(args);
return i;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
itemName = getArguments() != null ? getArguments().getString("text") : "NULL";
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_item, container, false);
View tv = v.findViewById(R.id.textView1);
((TextView) tv).setText("Cheese: " + itemName + " selected!");
return v;
}
}
Pager Layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:padding="4dip"
android:gravity="center_horizontal"
android:layout_width="match_parent" android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1">
</android.support.v4.view.ViewPager>
<LinearLayout android:orientation="horizontal"
android:gravity="center" android:measureWithLargestChild="true"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_weight="0">
<Button
android:id="#+id/goto_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="first" />
<Button android:id="#+id/goto_last"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="last">
</Button>
</LinearLayout>
Frag1 Layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#99EE11"
android:id="#+id/test">
<TextView android:id="#+id/text"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:gravity="center_vertical|center_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="#string/hello_world"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:id="#+id/root" >
<ListView android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false"/>
</FrameLayout>
Frag2 Layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#99EE11"
android:id="#+id/test2">
<TextView android:id="#+id/text"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:gravity="center_vertical|center_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="#string/hello_world"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:id="#+id/root2" >
<ListView android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false"/>
</FrameLayout>
ListItemFrag Layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/ll"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="230dp"
android:background="#AA33EE"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

Hi I was facing same kind of issue. I fixed the issue by using
getChildFragmentManager().beginTransaction()
instead of
getActivity().getSupportFragmentManager().beginTransaction()
As in this case we are trying to make transaction from within a fragment (one out of the list of fragments which are attached to the ViewPager, thus the Activity holding the ViewPager) so we have to use getChildFragmentManager() here for desired results.
NOTE: I am using android support v4 library and thus corresponding FragmentManager.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Replace fragmentA with fragmentB issue - android

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