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How to implement navigation activity and Recyclerview in MainActivity

I started off with a Navigation drawer activity and I added a recyclerView into the content_main.xml but I have been unable to implement the RecyclerView into the ManiActivity.java file.
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
That is what my MainAcitity.java looks like when I haven't only implemented the NavigationView Activity.
public class MainActivity extends AppCompatActivity implements MyRecyclerViewAdapter.ItemClickListener {
MyRecyclerViewAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// data to populate the RecyclerView with
ArrayList<String> animalNames = new ArrayList<>();
animalNames.add("Horse");
animalNames.add("Cow");
animalNames.add("Camel");
animalNames.add("Sheep");
animalNames.add("Goat");
// set up the RecyclerView
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rvAnimals);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
adapter = new MyRecyclerViewAdapter(this, animalNames);
adapter.setClickListener(this);
recyclerView.setAdapter(adapter);
}
#Override
public void onItemClick(View view, int position) {
Toast.makeText(this, "You clicked " + adapter.getItem(position) + " on row number " + position, Toast.LENGTH_SHORT).show();
}
}
And I also need this(the recyclerview) into my MainActivity.java There isn't room for both
This code below is my adapter class and the whole struggle is to add this to the MainActivity.java
public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.ViewHolder> {
private List<String> mData = Collections.emptyList();
private LayoutInflater mInflater;
private ItemClickListener mClickListener;
// data is passed into the constructor
public MyRecyclerViewAdapter(Context context, List<String> data) {
this.mInflater = LayoutInflater.from(context);
this.mData = data;
}
// inflates the row layout from xml when needed
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = mInflater.inflate(R.layout.recyclerview_row, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
// binds the data to the textview in each row
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
String animal = mData.get(position);
holder.myTextView.setText(animal);
}
// total number of rows
#Override
public int getItemCount() {
return mData.size();
}
// stores and recycles views as they are scrolled off screen
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView myTextView;
public ViewHolder(View itemView) {
super(itemView);
myTextView = (TextView) itemView.findViewById(R.id.tvAnimalName);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View view) {
if (mClickListener != null) mClickListener.onItemClick(view, getAdapterPosition());
}
}
// convenience method for getting data at click position
public String getItem(int id) {
return mData.get(id);
}
// allows clicks events to be caught
public void setClickListener(ItemClickListener itemClickListener) {
this.mClickListener = itemClickListener;
}
// parent activity will implement this method to respond to click events
public interface ItemClickListener {
void onItemClick(View view, int position);
}
}

You need to implement both NavigationView.OnNavigationItemSelectedListener and MyRecyclerViewAdapter.ItemClickListener interfaces on the MainActivity class. This way you would be able to call the adapter class for the Recycler view.Your code should look like this:
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, MyRecyclerViewAdapter.ItemClickListener {
MyRecyclerViewAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
// data to populate the RecyclerView with
ArrayList<String> animalNames = new ArrayList<>();
animalNames.add("Horse");
animalNames.add("Cow");
animalNames.add("Camel");
animalNames.add("Sheep");
animalNames.add("Goat");
// set up the RecyclerView
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rvAnimals);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
adapter = new MyRecyclerViewAdapter(this, animalNames);
adapter.setClickListener(this);
recyclerView.setAdapter(adapter);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
#Override
public void onItemClick(View view, int position) {
Toast.makeText(this, "You clicked " + adapter.getItem(position) + " on row number " + position, Toast.LENGTH_SHORT).show();
}
}
In Java, a class can implement more than one interfaces and a class can only extend from one parent. Implementation of more than one interfaces eliminates multiple inheritance which is not allowed in Java.
For example:
ClassA implements ClassB, ClassC
Your edited code can be found here

Problem seems to be associated with Adapter class. I would like to see your code for adapter.
1. Make sure if count is not equal to zero.
2. Make sure you are inflating a proper view in adapter class.
3. The view you are inflating must have external layout Relative or Linear or Constraint.

public class HomeActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener{
TabLayout tabLayout;
ViewPager viewPager;
NavigationView navigationView;
View navHeaderView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
navHeaderView = navigationView.getHeaderView(0);
viewPager = (ViewPager) findViewById(R.id.viewPagerContainer);
tabLayout = (TabLayout) findViewById(R.id.tabLayout);
textViewNavigationName = (TextView)
navHeaderView.findViewById(R.id.textViewNavigationName);
textViewNavigationEmail = (TextView)
navHeaderView.findViewById(R.id.textViewNavigationEmail);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
Fragment_Home objFragment1 = new Fragment_Home();
fragmentTransaction.add(R.id.viewPagerContainer, objFragment1).addToBackStack("backkkkkkkkkkkkk");
fragmentTransaction.commit();
}
}
public class Fragment_Home extends Fragment
{
private static final String ARG_PAGE_KEY = "arg_page";
String nextPageToken;
String prevPageToken;
String pageToken;
int sizeOfPlaylist;
int sizeOfCurrentList;
int firstItemPosition;
MenuItem nextItem;
MenuItem lastItem;
LinearLayout linearLayoutProgress, linearLayoutNoConnection;
Button buttonReload;
RecyclerView recyclerViewVideos;
AllVideosAdapterR adapter;
TextView textViewProgress;
public static Fragment_Home newInstance(int pageNumber) {
Fragment_Home myFragment = new Fragment_Home();
Bundle arguments = new Bundle();
arguments.putInt(ARG_PAGE_KEY, pageNumber);
myFragment.setArguments(arguments);
return myFragment;
}
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
setHasOptionsMenu(true);
LayoutInflater inflater1 = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater1.inflate(R.layout.fragment_home, container, false);
getActivity().invalidateOptionsMenu();
findControls(view);
gettingList();
buttonReload.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
gettingList();
}
});
return view;
}
public void findControls(View view)
{
recyclerViewVideos = (RecyclerView)view.findViewById(R.id.recyclerViewVideos);
linearLayoutProgress = (LinearLayout)view. findViewById(R.id.linearLayoutProgress);
textViewProgress = (TextView) view.findViewById(R.id.textViewProgress);
linearLayoutProgress.setVisibility(View.INVISIBLE);
linearLayoutNoConnection = (LinearLayout)view.findViewById(R.id.linearLayoutNoConnection);
linearLayoutNoConnection.setVisibility(View.INVISIBLE);
buttonReload = (Button)view.findViewById(R.id.buttonReload);
}
private boolean isDeviceOnline() {
ConnectivityManager connMgr =
(ConnectivityManager)getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
return (networkInfo != null && networkInfo.isConnected());
}
public void setAdapter(List<Item> listItems) {
recyclerViewVideos.setLayoutManager(new
LinearLayoutManager(getActivity()));
adapter = new AllVideosAdapterR(getActivity(), listItems);
recyclerViewVideos.setAdapter(adapter);
}
public void showProgress(String message) {
textViewProgress.setText(message);
linearLayoutProgress.setVisibility(View.VISIBLE);
}
public void stopProgress() {
linearLayoutProgress.setVisibility(View.INVISIBLE);
}
public void gettingList() {
if (!isDeviceOnline()) {
linearLayoutNoConnection.setVisibility(View.VISIBLE);
} else {
linearLayoutNoConnection.setVisibility(View.INVISIBLE);
}
showProgress("Loading videos..");
Retrofit retrofit = newRetrofit.Builder().baseUrl(BaseUrls.BASE_URL).addConverterFactory(GsonConverterFactory.create()).build();
WebApis call1 = retrofit.create(WebApis.class);
Call<ListResponse> call = call1.requestList();
call.enqueue(new Callback<ListResponse>() {
#Override
public void onResponse(Call<ListResponse> call, Response<ListResponse> response) {
System.out.println("size....................." + response.body().getItems().size());
setAdapter(response.body().getItems());
sizeOfPlaylist = response.body().getPageInfo().getTotalResults();
try {
nextPageToken = response.body().getNextPageToken();
prevPageToken = response.body().getPrevPageToken();
firstItemPosition = response.body().getItems().get(0).getSnippet().getPosition();
sizeOfCurrentList = response.body().getItems().size();
} catch (Exception e) {
Toast.makeText(getActivity(), "More pages not available", Toast.LENGTH_SHORT).show();
}
stopProgress();
}
#Override
public void onFailure(Call<ListResponse> call, Throwable t) {
stopProgress();
Toast.makeText(getActivity(), "Check your Network connection", Toast.LENGTH_LONG).show();
linearLayoutNoConnection.setVisibility(View.VISIBLE);
}
});
}
public void gettingNextList(String token) {
showProgress("Loading videos..");
Retrofit retrofit = new Retrofit.Builder().baseUrl(BaseUrls.BASE_URL).addConverterFactory(GsonConverterFactory.create()).build();
WebApis call1 = retrofit.create(WebApis.class);
Call<ListResponse> call = call1.requestNextList(token);
call.enqueue(new Callback<ListResponse>() {
#Override
public void onResponse(Call<ListResponse> call, Response<ListResponse> response) {
System.out.println("size....................." + response.body().getItems().size());
setAdapter(response.body().getItems());
try {
nextPageToken = response.body().getNextPageToken();
prevPageToken = response.body().getPrevPageToken();
firstItemPosition = response.body().getItems().get(0).getSnippet().getPosition();
sizeOfCurrentList = response.body().getItems().size();
} catch (Exception e) {
Toast.makeText(getActivity(), "More pages not available", Toast.LENGTH_SHORT).show();
}
stopProgress();
}
#Override
public void onFailure(Call<ListResponse> call, Throwable t) {
stopProgress();
Toast.makeText(getActivity(), "Network Problem", Toast.LENGTH_LONG).show();
}
});
}
public interface WebApis {
#GET(BaseUrls.GETTING_LIST)
Call<ListResponse> requestList();
#GET(BaseUrls.GETTING_LIST)
Call<ListResponse> requestNextList(#Query("pageToken") String pageToken);
}
}

Fragment "disappears" after opening new fragment and then coming back

This is kind of hard to explain so I took screenshots of my problem.
So this is my MainActivity.java
I open the navigation drawer and click on Milestones which will bring me to Milestones.java
Here I am at Milestones.java fragment...
working fine for now...
Just how I want it to look.
But when we leave Milestones and go anywhere else and come back it will be messed up. So I will go to Kick Counter.
Here I am in my KickCounter.java fragment
Open navigation drawer and going back to Milestones...
So right now I have fragment Months0Through6 open with Milestones fragment. Some times Months0Through6 and Month12Plus fragments does not show up right away after coming back some times it does. What is always messed up at this point is the Months6Through12 fragment will never display again unless you restart the app. Also swapping between the three fragments is laggy after coming back but never on first view.
Here it is. Where did it go?
youtube video: https://www.youtube.com/watch?v=6yMYcluvqbs
Get Source Here: https://github.com/delaroy/RecyclerViewFragment
I got my code from this youtube video which is almost exactly identical but his MainActivity (which I made into my Milestones fragment) is an activity whereas I used a fragment so I was thinking that might have something to do with my problem.
Milestones.java
public class Milestones 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 Milestones() {
// 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 Milestones.
*/
// TODO: Rename and change types and number of parameters
public static Milestones newInstance(String param1, String param2) {
Milestones fragment = new Milestones();
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) {
View rootView = inflater.inflate(R.layout.fragment_milestones, container, false);
Toolbar toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);
ViewPager viewPager = (ViewPager) rootView.findViewById(R.id.viewpager);
//dont know if this will work
PagerAdapter pagerAdapter = new PagerAdapter(getFragmentManager(), getContext());
viewPager.setAdapter(pagerAdapter);
TabLayout tabLayout = (TabLayout) rootView.findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(viewPager);
for(int i = 0; i < tabLayout.getTabCount(); i++){
TabLayout.Tab tab = tabLayout.getTabAt(i);
tab.setCustomView(pagerAdapter.getTabView(i));
}
// Inflate the layout for this fragment
return rootView;
}
// not boiler plate
#Override
public void onResume() {
super.onResume();
}
// probably just adding extra menu dont need it
/*#Override
public boolean onCreateOptionsMenu(Menu menu){
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
*/
//not boilerplate
#Override
public boolean onOptionsItemSelected(MenuItem item){
int id = item.getItemId();
if(id == R.id.action_settings){
return true;
}
return super.onOptionsItemSelected(item);
}
//not boilerplate
class PagerAdapter extends FragmentPagerAdapter {
String tabTitles[] = new String[]{"0-6 Months", "6-12 Months", "12+ Months"};
Context context;
public PagerAdapter(FragmentManager fm, Context context) {
super(fm);
this.context = context;
}
#Override
public int getCount() {
return tabTitles.length;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new Months0Through6();
case 1:
return new Months6Through12();
case 2:
return new Months12Plus();
}
return null;
}
#Override
public CharSequence getPageTitle(int position){
return tabTitles[position];
}
public View getTabView(int position){
View tab = LayoutInflater.from(getContext()).inflate(R.layout.custom_tab, null);
TextView tv = (TextView) tab.findViewById(R.id.custom_text);
tv.setText(tabTitles[position]);
return tab;
}
}
// 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 {
throw new RuntimeException(context.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
void onFragmentInteraction(Uri uri);
}
MilestonesAdapter.java
public class MilestonesAdapter extends RecyclerView.Adapter<MilestonesAdapter.MyViewHolder> {
private String[] mDataset;
public static class MyViewHolder extends RecyclerView.ViewHolder{
public CardView mCardView;
public TextView mTextView;
public MyViewHolder(View v){
super(v);
mCardView = (CardView) v.findViewById(R.id.card_view);
mTextView = (TextView) v.findViewById(R.id.tv_text);
}
}
public MilestonesAdapter(String[] myDataset){
mDataset = myDataset;
}
#Override
public MilestonesAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_item, parent, false);
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position){
holder.mTextView.setText(mDataset[position]);
}
#Override
public int getItemCount() { return mDataset.length; }
Just posting Months0Through6.java because the other two are exactly the same just different strings.
public class Months0Through6 extends android.support.v4.app.Fragment {
public Months0Through6() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_blank, container, false);
RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view);
rv.setHasFixedSize(true);
MilestonesAdapter adapter = new MilestonesAdapter(new String[]{"Month 0 stuff", "Example Two", "Example Three", "Example Four", "Example Five" , "Example Six" , "Example Seven"});
rv.setAdapter(adapter);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
rv.setLayoutManager(llm);
return rootView;
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity
implements KickCounter.OnFragmentInteractionListener, MommyMetrics.OnFragmentInteractionListener, Milestones.OnFragmentInteractionListener, NavigationView.OnNavigationItemSelectedListener {
Intent shareIntent;
String sharetext = "Hey check out mommy-info here at http://www.mommy-info.com";
private WebView myWebView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Connects to www.mommy-info.com
myWebView = (WebView)findViewById(R.id.webView_ID);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("http://www.mommy-info.com");
myWebView.setWebViewClient(new WebViewClient());
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();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
#Override
public void onBackPressed() {
//back button in navigation drawer logic
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
}
//back button in webView logic
else if(myWebView.canGoBack()){
myWebView.goBack();
}
else if(getFragmentManager().getBackStackEntryCount() > 0) {
getFragmentManager().popBackStack();
}
else{
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.kick_counter_ID) {
KickCounter kickCounter = new KickCounter();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.full_screen_ID, kickCounter).addToBackStack(null).commit();
} else if (id == R.id.nav_mommy_metrics) {
MommyMetrics mommyMetrics = new MommyMetrics();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.full_screen_ID, mommyMetrics).addToBackStack(null).commit();
} else if (id == R.id.nav_milestones) {
Milestones milestones = new Milestones();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.full_screen_ID, milestones).addToBackStack(null).commit();
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_SUBJECT, "my app");
shareIntent.putExtra(Intent.EXTRA_TEXT, sharetext);
startActivity(Intent.createChooser(shareIntent, "share via"));
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
#Override
public void onFragmentInteraction(Uri uri) {
}

In Fragments you need to use getChildFragmentManager(), You are using same Fragment manager in the fragments as in Activity. Hope this will help

Querying Azure Freezes Android App

I'm trying to integrate azure's app service with my app. In particular, I'm trying to store data on the database hosted by Azure. I can insert data fine, but whenever I try to retrieve it, my app freezes.
MainActivity- starts the activity and initializes the azure connection and table.
public class MainActivity extends ActionBarActivity {
/**
* TODO: view data, put data in ordered lists, rate data, scheduler
* **/
Toolbar toolbar;
ViewPager pager;
ViewPageAdapter adapter;
SlidingTabLayout tabs;
CharSequence Titles[]={"New","Trending","Famous"};
int Numboftabs =3;
MobileServiceClient client;
MobileServiceTable<Post> postTable;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Creating The Toolbar and setting it as the Toolbar for the activity
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
//manually set action bar color since not happening before
getWindow().setStatusBarColor(getResources().getColor(R.color.colorPrimaryDark));
// Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
adapter = new ViewPageAdapter(getSupportFragmentManager(),Titles,Numboftabs);
// Assigning ViewPager View and setting the adapter
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width
// Setting Custom Color for the Scroll bar indicator of the Tab View
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.colorAccent);
}
});
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
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();
postPrompt();
}
});
//initialize azure
try {
client = new MobileServiceClient("https://firechat.azurewebsites.net", this);
postTable = client.getTable(Post.class);
} catch (MalformedURLException e) {
e.printStackTrace();
}
//testing
//Post post = new Post("haha, so funny :p");
//postTable.insert(post);
}
private String makePost(String input){
Post post = new Post(input);
postTable.insert(post);
return post.text;
}
}
return post.text;
}
}
Tab1- a fragment that populates a list with data retrieved from the server. I believe my error is here when I try to query azure for the data.
public class Tab1 extends Fragment {
MainActivity mainActivity;
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.tab_1,container,false);
return v;
}
#Override
public void onStart() {
super.onStart();
try {
//get data from azure
mainActivity = (MainActivity) getActivity();
List<Post> postList= mainActivity.postTable.execute().get();
//List<Post> postList = new ArrayList<Post>();
//set lists
ListView newListView = (ListView) mainActivity.findViewById(R.id.newListView);
NewAdapter newAdapter = new NewAdapter(mainActivity, postList);
newListView.setAdapter(newAdapter);
}catch(Exception e){
}
}
}

I found out I was having the error because you must retrieve data from Azure using an async task. I left an example of one down below.
private void retrievePosts(){
AsyncTask<Void,Void,Void> task = new AsyncTask<Void,Void,Void>(){
#Override
protected Void doInBackground(Void... params) {
try {
postList= mainActivity.postTable.execute().get();
Log.e("TAG",postList.get(0).text);
newAdapter.updateList(postList);
} catch (final Exception e) {
}
return null;
}
};
runAsyncTask(task);
}

How to set one main activity and populate fragments in android

i have one mainactivity and other fragments , what i want is that by using only that single activity , i show a default fragment in activity and then when user click on navigation drawer then fragments according to that item must populate on the same are but with different information , i had searched a lot but not got proper solution for it , i am pasting my mainactivity class here ,
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, FragmentOne.OnFragmentInteractionListener,
FragmentTwo.OnFragmentInteractionListener {
private ListView mDrawerList;
private String[] mNavigationDrawerItemTitles;
Toolbar toolbar;
private SliderLayout mDemoSlider;
DrawerLayout drawer;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
mTitle = mDrawerTitle = getTitle();
setSupportActionBar(toolbar);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
NavigationView navView = (NavigationView) findViewById(R.id.nav_right_view);
navView.setNavigationItemSelectedListener(this);
navView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle Right navigation view item clicks here.
int id = item.getItemId();
Fragment fragment = null;
Class fragmentClass = null;
if (id == R.id.nav_settings) {
fragmentClass = first.class;
} else if (id == R.id.nav_logout) {
fragmentClass = secnd.class;
} try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
item.setChecked(true);
setTitle(item.getTitle());
DrawerLayout mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawer.closeDrawers();
return true;
}
});
}
code for first fragment class is here ,
public class first 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 first() {
// 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 FragmentOne.
*/
// TODO: Rename and change types and number of parameters
public static first newInstance(String param1, String param2) {
FragmentOne fragment = new FragmentOne();
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_fragment_one, 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 {
throw new RuntimeException(context.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
void onFragmentInteraction(Uri uri);
}
}
Thanks in advance

For solving your problem i am just using your code and doing some improvments ,just use required code in your activity file .
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
mTitle = mDrawerTitle = getTitle();
setSupportActionBar(toolbar);
///it is required code
if (savedInstanceState == null) {
Fragment fragment = null;
Class fragmentClass = null;
fragment = new Fragmentforslider();
fragmentClass= FragmentOne.class;
try {
} catch (Exception e) {
e.printStackTrace();
}
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
}
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);

Why is my android.R.id.home not called in my fragment?

I'm currently using FragmentStatePagerAdapter and I would like it to have a "navigate up" feature (DisplayHomeAsUpEnabled). When I set the following code it shows up as a correct navigate back button. But nothing happens when I click on it, can you guys see anything that I', doing wrong in my code, I get no error while pressing the "navigate up" button and I get no compiler errors.
Here is the code, its in the "public boolean onOptionsItemSelected(MenuItem item) {" it gets interesting at the bottom.
public class ShareholdingDetailFragment extends FragmentActivity {
final int NUM_ITEMS = Portfolio.getPortfolio().count();
MyAdapter mAdapter;
ViewPager mPager;
Bundle extras;
#Override
protected void onCreate(Bundle savedInstanceState) {
System.out.println(NUM_ITEMS + "e");
super.onCreate(savedInstanceState);
setContentView(R.layout.shareholdingdetailview_fragment_wrapper);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
}
public class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
public int getCount() {
return NUM_ITEMS;
}
public Fragment getItem(int position) {
return ShareholdingFragment.newInstance(position);
}
}
public static class ShareholdingFragment extends Fragment {
int mNum;
static ShareholdingFragment newInstance(int num) {
ShareholdingFragment f = new ShareholdingFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
}
#SuppressLint({ "NewApi", "NewApi" })
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.shareholdingdetailview_fragment, container, false);
/****************Setting the Display as home and it shows*******************/
ActionBar bar = getActivity().getActionBar();
bar.setDisplayHomeAsUpEnabled(true);
/**********************************/
return view;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home://Not working
System.out.println("test");//This isn't printed out
Intent upIntent = new Intent(getActivity(), DetailShareHoldingActivity.class);
if (NavUtils.shouldUpRecreateTask(getActivity(), upIntent)) {
getActivity().finish();
} else {
NavUtils.navigateUpTo(getActivity(), upIntent);
}
return true;
}
return super.onOptionsItemSelected(item);
}
}
}

Try adding: setHasOptionsMenu(true); in your onCreate() in ShareholdingFragment.

Add setHomeButtonEnabled(true) on API Level 14 and higher when you configure your action bar. On API Level 11-13, the home button is enabled automatically.

If you're using the new Toolbar and ActionbarDrawerToggle. You can assign clickHandler directly. For my activities that have this drawer toolbar I implemented an interface to enable drawer if at root,
#Override
public void enableDrawer(boolean enable) {
mDrawerToggle.setDrawerIndicatorEnabled(enable);
mDrawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Pop fragment back stack or pass in a custom click handler from the fragment.
}
});
}