Layout in ViewPager being replaced

Layout in ViewPager being replaced - android

I have a ViewPager layout like the one below. However, the LinearLayout within the ViewPager disappears and is replaced by the content I'm loading into the ViewPager.
activity_main.xml
<LinearLayout
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"
android:orientation="vertical"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<com.astuetz.PagerSlidingTabStrip
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="60dp"
app:pstsTabTextAlpha="150"
app:pstsIndicatorHeight="3dp"
app:pstsShouldExpand="true"
app:pstsUnderlineHeight="0dp"
app:pstsTabTextSize="14dp"
/>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tabs">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<ImageView
android:layout_width="120dp"
android:layout_height="120dp"
android:id="#+id/image"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:background="#drawable/ic_image"
android:adjustViewBounds="true"
android:scaleType="centerCrop" />
</LinearLayout>
</android.support.v4.view.ViewPager>
</LinearLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity
implements FirstFragment.OnFragmentInteractionListener,
SecondFragment.OnFragmentInteractionListener,
ThirdFragment.OnFragmentInteractionListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize the ViewPager and set an adapter
ViewPager pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(new PagerAdapter(getSupportFragmentManager()));
// Bind the tabs to the ViewPager
PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
tabs.setViewPager(pager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_group, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void onFragmentInteraction(Uri uri){
//
}
private class PagerAdapter extends FragmentPagerAdapter {
private final String[] TITLES = {"First", "Second", "Third"};
public PagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public CharSequence getPageTitle(int position) {
return TITLES[position];
}
#Override
public int getCount() {
return TITLES.length;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FirstFragment();
case 1:
return new SecondFragment();
case 2:
return new ThirdFragment();
}
return null;
}
}
}
FirstFragment.java
public class FirstFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
String BASE_URL = "http://www.example.com/api";
private OnFragmentInteractionListener mListener;
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment FirstFragment.
*/
// TODO: Rename and change types and number of parameters
public static FirstFragment newInstance(String param1, String param2) {
FirstFragment fragment = new FirstFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public FirstFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_first, container, false);
final ListView listView = (ListView) view.findViewById(R.id.listview_posts);
final ArrayList<Post> postArray = new ArrayList<Post>();
// REST API
final RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint(BASE_URL)
.build();
final ApiEndpointInterface apiService = restAdapter.create(ApiEndpointInterface.class);
apiService.getData(1, new Callback<PostData>() {
#Override
public void success(PostData postData, Response response) {
final PostAdapter adapter = new PostAdapter(getActivity(), postArray);
postArray.addAll(postData.getData());
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
#Override
public void failure(RetrofitError retrofitError) {
retrofitError.printStackTrace();
}
});
return view;
}
class Deserializer implements JsonDeserializer<Post> {
#Override
public Post deserialize(JsonElement je, Type type, JsonDeserializationContext jdc)
throws JsonParseException {
// Get the "content" element from the parsed JSON
JsonElement content = je.getAsJsonObject().get("data");
// Deserialize it. You use a new instance of Gson to avoid infinite recursion
// to this deserializer
return new Gson().fromJson(content, Post.class);
}
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(Uri uri);
}
}
fragment_first.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.project.app.FirstFragment">
<ListView
android:id="#+id/listview_posts"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:dividerHeight="0dp"
android:divider="#null" />
</LinearLayout>
Why is it replacing everything in the ViewPager? How can I instead append the data to the ViewPager, such that the data goes below the layout in the ViewPager?

You can't do that... The viewpager will always do this.. yiu may need to put the layouts outside the viewpager.. in a way the makes user feel they are inside...

you should include this components in Fragment layout
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.project.app.FirstFragment">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<ImageView
android:layout_width="120dp"
android:layout_height="120dp"
android:id="#+id/image"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:background="#drawable/ic_image"
android:adjustViewBounds="true"
android:scaleType="centerCrop" />
</LinearLayout>
<ListView
android:id="#+id/listview_posts"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:dividerHeight="0dp"
android:divider="#null" />
</LinearLayout>
or place them under ViewPager like this
<LinearLayout
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"
android:orientation="vertical"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<com.astuetz.PagerSlidingTabStrip
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="60dp"
app:pstsTabTextAlpha="150"
app:pstsIndicatorHeight="3dp"
app:pstsShouldExpand="true"
app:pstsUnderlineHeight="0dp"
app:pstsTabTextSize="14dp"
/>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tabs">
</android.support.v4.view.ViewPager>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<ImageView
android:layout_width="120dp"
android:layout_height="120dp"
android:id="#+id/image"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:background="#drawable/ic_image"
android:adjustViewBounds="true"
android:scaleType="centerCrop" />
</LinearLayout>
</LinearLayout>

Related

Display data from json in RecyclerView of Fragment using AsyncTask?

I have the following classes:
CategoryFragment.java
public class CategoryFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "category_name";
// TODO: Rename and change types of parameters
private int mParam1;
public CategoryFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #return A new instance of fragment CategoryFragment.
*/
// TODO: Rename and change types and number of parameters
public static CategoryFragment newInstance(int param1) {
CategoryFragment fragment = new CategoryFragment();
Bundle args = new Bundle();
args.putInt(ARG_PARAM1, param1);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getInt(ARG_PARAM1);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Context context = getActivity();
View view = inflater.inflate(R.layout.listado_noticias, container, false);
RecyclerView rw_noticias = view.findViewById(R.id.rw_noticias);
new LoadArticlesTask().execute(MainScreen.mPrefs,MainScreen.hasRemember,view,context,rw_noticias);
return null;
}
}
listado_noticias.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/constraintLayout"
xmlns:tools="http://schemas.android.com/tools">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rw_noticias"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
LoadArticlesTask.java
public class LoadArticlesTask extends AsyncTask<Object, Void, List<Article>> {
private static final String TAG = "LoadArticlesTask";
private View view;
private Context context;
private RecyclerView rw_noticias;
#Override
protected List<Article> doInBackground(Object... params) {
SharedPreferences sp = (SharedPreferences)params[0];
boolean hasRemember = (boolean)params[1];
view = (View)params[2];
context = (Context)params[3];
rw_noticias = (RecyclerView)params[4];
List<Article> res = null;
Properties ini = new Properties();
ini.setProperty(RESTConnection.ATTR_SERVICE_URL,Constants.URL_SERVICE);
ini.setProperty(RESTConnection.ATTR_REQUIRE_SELF_CERT,Constants.CERT_VALUE);
ModelManager.configureConnection(ini);
String strIdUser;
String strApiKey;
String strIdAuthUser;
if(hasRemember){
strIdUser = sp.getString("pref_apikey","");
strApiKey = sp.getString("pref_IdUser","");
strIdAuthUser = sp.getString("pref_strIdAuthUser","");
}else {
strIdUser = ModelManager.getLoggedIdUSer();
strApiKey = ModelManager.getLoggedApiKey();
strIdAuthUser = ModelManager.getLoggedAuthType();
}
//ModelManager uses singleton pattern, connecting once per app execution in enough
if (!ModelManager.isConnected()){
// if it is the first login
if (strIdUser==null || strIdUser.equals("")) {
try {
ModelManager.login(Constants.USER, Constants.PASS);
} catch (AuthenticationError e) {
Log.e(TAG, e.getMessage());
}
}
// if we have saved user credentials from previous connections
else{
ModelManager.stayloggedin(strIdUser,strApiKey,strIdAuthUser);
}
}
//If connection has been successful
if (ModelManager.isConnected()) {
try {
// obtain 6 articles from offset 0
res = ModelManager.getArticles(6, 0);
for (Article article : res) {
// We print articles in Log
Log.i(TAG, String.valueOf(article));
}
} catch (ServerCommunicationError e) {
Log.e(TAG,e.getMessage());
}
}
return res;
}
#Override
protected void onPostExecute(List<Article> articles) {
super.onPostExecute(articles);
Log.i("Articles", articles.toString());
for (Article article : articles) {
// We print articles in Log
Log.i("Articles", String.valueOf(article));
}
refreshList(articles,view);
}
public void refreshList(List<Article> data, View view){
if (data == null){
return;
}
for (Article article : data) {
// We print articles in Log
Log.i("Articles_rl", String.valueOf(article));
}
final LinearLayoutManager layoutManager = new LinearLayoutManager(context);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
rw_noticias.setLayoutManager(layoutManager);
ArticlesAdapter articlesAdapter = new ArticlesAdapter(data);
rw_noticias.setAdapter(articlesAdapter);
((ArticlesAdapter)rw_noticias.getAdapter()).updateData(data);
}
}
ArticlesAdapter.java
public class ArticlesAdapter extends RecyclerView.Adapter<ArticlesAdapter.ArticleViewHolder>{
private List<Article> articulos;
public ArticlesAdapter(List<Article> articulos){
this.articulos = articulos;
}
#NonNull
#Override
public ArticleViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout_article, parent, false);
return new ArticleViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull ArticleViewHolder holder, int position) {
Bitmap imagen = null;
holder.category.setText(articulos.get(position).getCategory());
holder.title.setText(articulos.get(position).getTitleText());
holder.resumen.setText(articulos.get(position).getAbstractText());
try {
imagen = SerializationUtils.base64StringToImg(articulos.get(position).getImage().getImage());
} catch (ServerCommunicationError serverCommunicationError) {
serverCommunicationError.printStackTrace();
}
holder.thumbnail.setImageBitmap(imagen);
}
#Override
public int getItemCount() {
return articulos.size();
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
public void updateData(List<Article>data){
articulos.clear();
articulos.addAll(data);
notifyDataSetChanged(); //notify to repaint the list
}
public void articlesFilterCategory(String category){
for (Article a : articulos){
if(!category.equals("ALL") && !a.getCategory().equals(category)){
articulos.remove(a);
}
}
}
public static class ArticleViewHolder extends RecyclerView.ViewHolder{
CardView cv;
TextView category;
TextView title;
TextView resumen;
ImageView thumbnail;
public ArticleViewHolder(#NonNull View itemView) {
super(itemView);
cv = (CardView)itemView.findViewById(R.id.card_article);
category = (TextView)itemView.findViewById(R.id.category_noticia);
resumen = (TextView)itemView.findViewById(R.id.resumen_noticia);
thumbnail = (ImageView)itemView.findViewById(R.id.thumbnail);
}
}
}
card_layout_article.xml
<androidx.cardview.widget.CardView 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"
android:foreground="?attr/selectableItemBackground"
android:ellipsize="end"
android:id="#+id/card_article"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="16dp"
android:paddingHorizontal="1dp">
<ImageView
android:id="#+id/thumbnail"
android:layout_width="match_parent"
android:layout_height="231dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="1dp"
android:layout_marginTop="1dp"
android:adjustViewBounds="true"
android:background="#drawable/a15877171854035"
android:cropToPadding="true"
android:scaleType="fitXY"
android:src="#drawable/degradado" />
<View
android:layout_width="match_parent"
android:layout_height="233dp"
android:background="#drawable/degradado" />
<TextView
android:id="#+id/title_noticia"
android:layout_width="193dp"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/thumbnail"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_marginStart="107dp"
android:layout_marginEnd="107dp"
android:layout_marginBottom="95dp"
android:text="Nuevo caso de coronavirus"
android:textAlignment="center"
android:textColor="#color/cardview_light_background"
android:textSize="20dp"
android:textStyle="bold" />
<TextView
android:id="#+id/category_noticia"
android:layout_width="91dp"
android:layout_height="31dp"
android:layout_alignBottom="#+id/thumbnail"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_marginStart="11dp"
android:layout_marginEnd="316dp"
android:layout_marginBottom="145dp"
android:text="NATIONAL"
android:textAlignment="center"
android:textColor="#color/cardview_light_background"
android:textSize="15dp"
android:textStyle="bold" />
<TextView
android:id="#+id/resumen_noticia"
android:layout_width="match_parent"
android:layout_height="90dp"
android:layout_alignBottom="#+id/thumbnail"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_marginStart="0dp"
android:layout_marginEnd="0dp"
android:layout_marginBottom="-1dp"
android:text="Nuevo caso de coronavirus"
android:textAlignment="viewStart"
android:textColor="#color/cardview_light_background"
android:textSize="11dp"
android:textStyle="bold" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
In the log.i that I have in the Post Execute of the async task I can see how the articles are formed (The Article class has a toString () function).
But I can't get the articles to be seen in the RecyclerView. What am I doing wrong?
Capture: Main screen with recyclerView empty...
Thanks!

Pass the instance of RecyclerView like -
new LoadArticlesTask().execute(MainScreen.mPrefs, MainScreen.hasRemember, view, rw_noticias, context);
Receive this on LoadArticlesTask as you are doing with View.
Don't re-initialize/use this code inside your class -
RecyclerView rw_noticias = view.findViewById(R.id.rw_noticias);

In your card_layout_article.xml, make height wrap_content for cardview:
<androidx.cardview.widget.CardView 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="wrap_content"
........
........
Also in the layout of your recycler view instead of ConstraintLayout try to use RelativeLayout as the parent:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/constraintLayout"
xmlns:tools="http://schemas.android.com/tools">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rw_noticias"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>

java.lang.IllegalArgumentException: No view found for id 0x7f080076

I have a bottom navigation activity ,In bottom navigation activity I have 3 icons Home,Reminders,settings.
For this I have 3 fragments, Home fragment, Reminder fragment and settings fragment. I don't have anything in fragments all are empty fragments except Home fragment. In Home Fragment I have a Tab layout but I didn't added anything with tab layout.
After running the project the Home fragment is not get displayed (default when app get launched). It shows only the bottom navigation view.
If I clicked on reminders Icon app get crashed with the following error.
Error:
java.lang.IllegalArgumentException: No view found for id 0x7f080076 (com.aviz.www.reminder:id/reminders_Fragment) for fragment Reminders{2eca87b #0 id=0x7f080076}
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1413)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1740)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1809)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:799)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2580)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2367)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:700)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
MainActivity.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:id="#+id/Conslayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/navigation" />
</android.support.constraint.ConstraintLayout>
MainActivity
public class MainActivity extends AppCompatActivity
implements Home.OnFragmentInteractionListener,
Reminders.OnFragmentInteractionListener,
Settings.OnFragmentInteractionListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
switchToHomeFragment();
break;
case R.id.navigation_dashboard:
switchToRemindersFragment();
break;
case R.id.navigation_notifications:
switchToSettingsFragment();
break;
}
return false;
}
};
public void switchToHomeFragment() {
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(R.id.home_Fragment, new Home()).commit();
}
public void switchToRemindersFragment() {
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(R.id.reminders_Fragment, new Reminders()).commit();
}
public void switchToSettingsFragment() {
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(R.id.settings_Fragment, new Settings()).commit();
}
#Override
public void onFragmentInteraction(Uri uri) {
}
}
Home Fragment XML
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/home_Fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".Fragments.Home">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_weight="1"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:title="#string/app_name">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
style="#style/MyCustomTabLayout"
android:layout_height="wrap_content">
<android.support.design.widget.TabItem
android:id="#+id/tabItem_Today"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Today" />
<android.support.design.widget.TabItem
android:id="#+id/tabItem_ThisWeek"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This Week" />
<android.support.design.widget.TabItem
android:id="#+id/tabItem_ThisMonth"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This Month" />
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</FrameLayout>
Home.java
public class Home extends Fragment {
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public Home() {
}
public static Home newInstance(String param1, String param2) {
Home fragment = new Home();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_home, container, false);
}
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnFragmentInteractionListener {
void onFragmentInteraction(Uri uri);
}
}
In Home.java all codes are auto generated code when I create the Home fragment.

in this line:
manager.beginTransaction().replace(R.id.reminders_Fragment, new Reminders()).commit();
R.id.reminders_Fragment
is a container id which will be wrapped around Remainders Fragment but i can not see any container in your Home layout with this id
even below code has same problem because you do not have any container with used
settings_Fragment id in your home layout:
manager.beginTransaction().replace(R.id.settings_Fragment, new Settings()).commit();
if you want every time one of your fragment be shown add one FrameLayout and use its id for container otherwise use one FrameLayout for every fragment and use id of FrameLayouts for transactions
You can use below code to select a default tab on resume:
onResume(){
super.onResume();
if(tabLayout.getSelectedTabPosition == -1)
tabLayout.getTabAt(0).select();
}

Android Studio Fragments not loading

When loading my program on a device for testing, as I open different fragments using the bottom navigation nothing happens what so ever. If you need me to add more code please say so. I've posted my XML and Java for the Main Activity and the XML contains the mainFrame for my layout.
public class MainActivity extends AppCompatActivity {
private TextView mTextMessage;
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction transaction = fragmentManager.beginTransaction();
switch (item.getItemId()) {
case R.id.shareFrame:
transaction.replace(R.id.mainFrame, new shareFragment()).commit();
mTextMessage.setText(R.string.title_share);
return true;
case R.id.settingsFrame:
transaction.replace(R.id.mainFrame, new settingsFragment()).commit();
mTextMessage.setText(R.string.title_settings);
return true;
case R.id.helpFrame:
transaction.replace(R.id.mainFrame, new helpFragment()).commit();
mTextMessage.setText(R.string.title_help);
return true;
}
return false;
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextMessage = (TextView) findViewById(R.id.message);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.mainFrame, new shareFragment()).commit();
}
}
Here is the Java for my shareFragment.java
public class shareFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public shareFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment shareFragment.
*/
// TODO: Rename and change types and number of parameters
public static shareFragment newInstance(String param1, String param2) {
shareFragment fragment = new shareFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_share, container, false);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
Toast.makeText(context, "Share", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
And here is the XML
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/shareFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.swapdrop.swapdrop.shareFragment">
</FrameLayout>

Looks like your calling the empty Constructor.
Change:
transaction.replace(R.id.mainFrame, new shareFragment()).commit();
to
transaction.replace(R.id.mainFrame, shareFragment.newInstance("arg 1","arg 2")).commit();
Also, java convention is to upper case class names. shareFragment -> ShareFragment

Try change your layout with this:
<?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.swapdrop.swapdrop.MainActivity"
android:background="#d3d3d3">
<FrameLayout
android:id="#+id/mainFrame"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/navigation" />
</android.support.constraint.ConstraintLayout>
Now mainFrame is the FrameLayout instead of the parent Layout

Your root layout shouldn't be the "mainFrame". You should have a child ViewGroup to contain the fragment. Something like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/mainFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/navigation"
android:background="#d3d3d3" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="?android:attr/windowBackground"
app:menu="#menu/navigation" />
</RelativeLayout>

Why not try something like:
transaction.replace(R.id.mainFrame, shareFragment().newInstance("param1", " param2")).commit();
since the default constructor is not returning any Fragment().

Setonitemclicklistener inside fragment of tabbed activity

I'm new in android and I want to make a project, but I have a problem with inserting a list view inside fragment of tabbed activity which can pass to another activity when clicked. Before I asked here, I already tried to search the solution but it didn't work, I hope anyone in here can solve my problem.
Here's my code
Service Activity as a Tab host
public class ServiceActivity extends AppCompatActivity {
/**
* The {#link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {#link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {#link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {#link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_service);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
//deleted PlaceHolderFragment
/**
* A {#link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
switch (position) {
case 0:
Sinspection sins = new Sinspection();
return sins;
case 1:
Minspection mins = new Minspection();
return mins;
case 2:
Linspection lins = new Linspection();
return lins;
case 3:
WRinspection wrins = new WRinspection();
return wrins;
default:
return null;
}
}
#Override
public int getCount() {
// Show total pages.
return 4;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "S Inspection";
case 1:
return "M Inspection";
case 2:
return "L Inspection";
case 3:
return "When Required";
}
return null;
}
}
Fragment Class
public class Linspection extends ListFragment {
String [] linsp = {
"Differential Oil and Filter",
"Hub and Reduction Gear Oil",
"Wheel Nut",
"Air Dryer Filter"
};
ArrayAdapter<String> adapter;
ListView listView;
#Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
listView = (ListView)getActivity().findViewById(R.id.listViewL);
adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.
simple_list_item_1,linsp);
setListAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
switch (position){
case 0:
Intent intent = new Intent(getActivity(), EngineOil.class);
startActivity(intent);
}
}
});
return super.onCreateView(inflater, container, savedInstanceState);
}
I want to pass to this activity
public class EngineOil extends AppCompatActivity {
ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.s_engine_oil);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
viewPager = (ViewPager) findViewById(R.id.viewPager);
ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(this);
viewPager.setAdapter(viewPagerAdapter);
}
}
This is my xml:
activity_service
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
>
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/listViewL"
>
</ListView>
</RelativeLayout>
activity destionation xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:theme="?attr/actionBarTheme"
android:minHeight="?attr/actionBarSize"
android:id="#+id/toolbar3"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true" />
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="250dp"
android:id="#+id/viewPager"
android:layout_marginTop="20dp"
android:layout_below="#+id/toolbar3"
android:layout_alignParentStart="true">
</android.support.v4.view.ViewPager>
</RelativeLayout>
When I run the application it "always keep crashing". I don't know how to fix it, and hope you can help me to solve my problem
Thanks in advance

I made a project for you to use as reference.
`activity_main`
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TabHost
android:id="#+id/tabHost"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TabWidget
android:id="#android:id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<FrameLayout
android:id="#android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/tab1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:id="#+id/ll_cashier_invoice"
android:baselineAligned="false"
android:gravity="center_vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="4dip">
<fragment
android:id="#+id/frag_invoice"
android:name="com.example.sydney.sample.MainActivity$FirstFragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:id="#+id/tab2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</LinearLayout>
<LinearLayout
android:id="#+id/tab3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</LinearLayout>
<LinearLayout
android:id="#+id/tab4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</LinearLayout>
</FrameLayout>
</LinearLayout>
</TabHost>
</RelativeLayout>
`fragment1.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">
<ListView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:entries="#array/myArray" />
</LinearLayout>
`MainActivity.java`
public class MainActivity extends Activity {
ListView lv;
TabHost host;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
host = (TabHost)findViewById(R.id.tabHost);
host.setup();
lv = (ListView)findViewById(R.id.list);
TabHost.TabSpec spec = host.newTabSpec("Sinspection");
spec.setContent(R.id.tab1);
spec.setIndicator("Sinspection");
host.addTab(spec);
//Tab 2
spec = host.newTabSpec("Minspection");
spec.setContent(R.id.tab2);
spec.setIndicator("Minspection");
host.addTab(spec);
//Tab 3
spec = host.newTabSpec("Linspection");
spec.setContent(R.id.tab3);
spec.setIndicator("Linspection");
host.addTab(spec);
//Tab 4
spec = host.newTabSpec("Winspection");
spec.setContent(R.id.tab4);
spec.setIndicator("Winspection");
host.addTab(spec);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent myIntent = new Intent(MainActivity.this,NextActivity.class);
startActivity(myIntent);
}
});
}
public static class FirstFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment1, container, false);
}
}
}
Click here for the full code.

Replace fragment in fragment itself in TabActivity

I am sorry on the duplicate question but I didn't get answer for my problem.
I create app with TabActivity and also trying to replace one fragment from fragment itself, I read in https://developer.android.com/training/basics/fragments/fragment-ui.html how to do it and i created interface in my fragment that i want to be replace with another,
I implement the interface in my MainActivity and still when running my app it show me container itself.
here is my code:
Main Activity:
public class MainActivity extends FragmentActivity implements New2.OnReplaceFragment {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
public static MainActivity instance = null;
public static MainActivity getInstance(){
return instance;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.frame_container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
tabLayout.getTabAt(0).setIcon(R.drawable.icon_info);
tabLayout.getTabAt(1).setIcon(R.drawable.icon_heart_rate_sensor_jpg);
tabLayout.getTabAt(2).setIcon(R.drawable.icon_graph_jpg);
instance = this;
}
#Override
public void onReplaceFragment(Class fragmentClass) {
Fragment fragment = null;
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// Insert the fragment by replacing any existing fragment
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_container,fragment);
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack so the user can navigate back
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
switch (position) {
case 0:
// New1 tab1 = new New1();
return New1.newInstance();
case 1:
return New2.newInstance();
case 2:
return New3.newInstance();
default:
return null;
}
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
}
return null;
}
}
}
my fragment that I want to replace
Fragment:
public class New2 extends Fragment {
TextView name;
Button change;
ImageView image1;
Animation anime;
private OnReplaceFragment dataPasser;
public static New2 newInstance(){
New2 fragment = new New2();
return fragment;
}
public New2(){
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_new2, container, false);
name = (TextView) rootView.findViewById(R.id.nameTt);
change = (Button) rootView.findViewById(R.id.changeBtn);
image1 = (ImageView) rootView.findViewById(R.id.image1);
anime = AnimationUtils.loadAnimation(getActivity().getApplicationContext(),R.anim.zoom);
change.setOnClickListener(changeName);
return rootView;
}
View.OnClickListener changeName = new View.OnClickListener() {
#Override
public void onClick(View view) {
image1.startAnimation(anime);
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run(){
dataPasser.onReplaceFragment(Result.class);
}
},1000);
}
};
public interface OnReplaceFragment {
public void onReplaceFragment(Class fragmentClass);
}
#Override
public void onAttach(Activity a) {
super.onAttach(a);
try {
dataPasser = (OnReplaceFragment) a;
} catch (ClassCastException e) {
throw new ClassCastException(a.toString() + " must implement onDataPass");
}
}
}
the fragment that i want to display
public class Result extends Fragment {
TextView textView;
Button btnBack;
public static Result instance = null;
public static Result getInstance(){
return instance;
}
public Result() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_result, container, false);
textView = (TextView) v.findViewById(R.id.text11);
btnBack = (Button) v.findViewById(R.id.btnBack);
textView.setText("working!!");
Toast.makeText(getActivity().getApplicationContext(),"working",Toast.LENGTH_LONG).show();
return v;
}
}
Main Activity XML:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.example.hercules.tadhosttutrial.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:background="#color/red"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
New2 XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.hercules.tadhosttutrial.New2"
android:background="#color/yellow">
<!-- TODO: Update blank fragment layout -->
<Button
android:id="#+id/changeBtn"
android:layout_width="80dp"
android:layout_height="40dp"
android:layout_gravity="center_horizontal"
android:text="change"/>
<ImageView
android:id="#+id/image1"
android:background="#drawable/icon_complete"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
/>
Result XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorAccent"
tools:context="com.example.hercules.tadhosttutrial.Result">
<!-- TODO: Update blank fragment layout -->
<Button
android:id="#+id/btnBack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="back"/>
<TextView
android:id="#+id/text11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="WORKING"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:textSize="70dp"
/>
</RelativeLayout>

What i mean, is making MainActivity as a main container for all fragments, either with tabs or just a regular fragment,
1- Main Activity XML: remove ViewPager, add a FrameLayout instead (use same id)
2- Create new fragment TabsFragment with this XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.hercules.tadhosttutrial.New2"
android:background="#color/yellow">
<android.support.v4.view.ViewPager
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</RelativeLayout>
3- Move initializing SectionsPagerAdapter and ViewPager from main activity to TabsFragment:
this part:
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
and this:
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.frame_container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
tabLayout.getTabAt(0).setIcon(R.drawable.icon_info);
tabLayout.getTabAt(1).setIcon(R.drawable.icon_heart_rate_sensor_jpg);
tabLayout.getTabAt(2).setIcon(R.drawable.icon_graph_jpg);
4- I think moving SectionsPagerAdapter class in a new file is better too.
now if you want default view for app to be the tabs, then in MainActivity at onCreate() show TabsFragment by calling your method:
onReplaceFragment(TabsFragment.class);
now every thing should work fine, because the idea here is to replace the fragment displayed in main activity with another one
in this case TabsFragment, Result, and New2
not to replace viewpager fragments (because as i told you this is managed via the adapter) not by calling replace()
you may need to play around this, it's not a final code, just something to give you idea about it.

Develop Reference

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