How to implement navigation activity and Recyclerview in MainActivity

How to implement navigation activity and Recyclerview in MainActivity - java

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);
}
}

Related

I have created a wallpapers app using viewpager and urls of images but I am not able to set wallpapers I am placing my Urls in string

This is my mainactivity class and I am using my urls in the string. Anyone please tell me how to set wallpapers using multiple urls. I am using multiple urls to show in viewpager its working but I can't set wallpapers.
This is my main activity class.
I want to set wallpapers on floating button onclick listener
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private String[] imageUrls = new String[]{
"https://i.jj.cc/MGTTwJ7Q/Ant-Man-474b00d1-4bdc-3ea6-88a3-1702c46f061c.jpg",
"https://i.jj.cc/SKvKN1dt/fdg-min.jpg",
"https://i.jj.cc/fLSR37gW/uhd-antman18-min.jpg",
"https://i.jj.cc/Gt0hvBZF/uhd-antman7-min.jpg",
"https://i.jj.cc/ryWpMJrQ/Antman-And-The-Wasp-d4a753af-1dd1-4df2-aeb6-d39c732fd16a.jpg",
"https://i.jj.cc/RVLVnZGt/uhd-antman21-min.jpg",
"https://i.jj.cc/t4RRdGmM/Ant-man-and-the-wasp-a294bb80-e6f9-41c1-bf46-07af64e3e348.jpg",
"https://i.jj.cc/y8f1vpMY/Antman-d8033f49-b33c-4cd4-b3ca-651417df20da.jpg",
"https://i.jj.cc/yNkV5XKh/Antman-Abstract-HD-05ef2c84-e5d3-41e9-afa1-1400c315bf06.jpg",
"https://i.jj.cc/8C91VJk2/IMG-0139.jpg",
"https://i.jj.cc/Znh4CGdj/antman-70390c1f-2d63-41ea-a487-e34668167e7e.jpg",
"https://i.jj.cc/vTLM907y/antman-2fde23ba-9eac-4f11-acf7-b872b9b71121.jpg",
"https://i.jj.cc/66dBDpkP/Antman-d353b93b-5c57-4363-ad92-4a974423d2b5.jpg",
"https://i.jj.cc/rFMqcLcw/Antman-df2e8adb-b0a0-42b6-ade7-38d041349ed1.jpg",
"https://i.jj.cc/YCSkGfvc/Antman-32cb0b83-f4b6-4a24-854a-913b593c0291.jpg",
"https://i.jj.cc/zGPNnbhy/razakbaap49.jpg",
"https://i.jj.cc/tgZjDqd2/antman05-uhd.jpg"
};
private int indexOfImage = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
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);
ViewPager viewPager = findViewById(R.id.view_pager);
ViewPagerAdapter adapter = new ViewPagerAdapter(this, imageUrls);
viewPager.setAdapter(adapter);
viewPager.setOnPageChangeListener(new MyPageChangeListener());
FloatingActionButton floatingActionButton = (FloatingActionButton)findViewById(R.id.fab);
floatingActionButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
}
#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;
}
private class MyPageChangeListener implements ViewPager.OnPageChangeListener {
#Override
public void onPageScrolled(int i, float v, int i1) {
}
#Override
public void onPageSelected(int i) {
MainActivity.this.indexOfImage = i;
}
#Override
public void onPageScrollStateChanged(int i) {
}
}
}
This is my viewpager adapter class
public class ViewPagerAdapter extends PagerAdapter {
private Context context;
private String[] imageUrls;
ViewPagerAdapter(Context context, String[] imageUrls) {
this.context = context;
this.imageUrls = imageUrls;
}
#Override
public int getCount() {
return imageUrls.length;
}
#Override
public boolean isViewFromObject(#NonNull View view, #NonNull Object object) {
return view == object;
}
#NonNull
#Override
public Object instantiateItem(#NonNull ViewGroup container, int position) {
ImageView imageView = new ImageView(context);
Picasso.with(context)
.load(imageUrls[position])
.fit()
.centerCrop()
.error(R.drawable.ic_error_outline_black_24dp)
.into(imageView);
container.addView(imageView);
return imageView;
}
#Override
public void destroyItem(#NonNull ViewGroup container, int position, #NonNull Object object) {
container.removeView((View) object);
}
}

Add permission in manifest
<uses-permission android:name="android.permission.SET_WALLPAPER"/>
Add this AsyncTask class in your MainActivity
public class SetWallpaper extends AsyncTask<String, Void, Bitmap> {
ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
#Override
protected Bitmap doInBackground(String... params) {
Bitmap bitmap = null;
try {
bitmap = Picasso.get().load(params[0]).get();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
#Override
protected void onPostExecute (Bitmap result) {
super.onPostExecute(result);
WallpaperManager wallpaperManager = WallpaperManager.getInstance(getBaseContext());
try {
wallpaperManager.setBitmap(result);
progressDialog.dismiss();
Toast.makeText(getApplicationContext(), "Wallpaper changed", Toast.LENGTH_SHORT).show();
} catch (IOException ex) {
ex.printStackTrace();
}
}
#Override
protected void onPreExecute () {
super.onPreExecute();
progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setMessage("Loading image...");
progressDialog.setCancelable(false);
progressDialog.show();
}
}
Then try
floatingActionButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SetWallpaper sw = new SetWallpaper();
sw.execute(imageUrls[indexOfImage])
}
});

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

RecycleView on Fragment using Custom Adapter with Retrofit

public class AgentAdapter extends RecyclerView.Adapter<AgentAdapter.CustomViewHolder> {
private List<Agent> agentList;
private Context mContext;
public AgentAdapter(Context context, List<Agent> agentList) {
this.agentList= agentList;
this.mContext = context;
}
#Override
public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.agent_row, null);
CustomViewHolder viewHolder = new CustomViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(CustomViewHolder customViewHolder, int i) {
final Agent agent = agentList.get(i);
//Setting text view title
customViewHolder.textViewAgentName.setText(agent.getAgentName());
customViewHolder.textViewAgentPhone.setText(agent.getAgentPhone());
customViewHolder.textViewAgentRegion.setText(agent.getRegion());
customViewHolder.textViewAgentStatus.setText(agent.getAgentStatus());
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
onItemClickListener.onItemClick(agent);
}
};
customViewHolder.textViewAgentName.setOnClickListener(listener);
}
#Override
public int getItemCount() {
return (null != agentList ? agentList.size() : 0);
}
public void updateAnswers(List<Agent>agent ) {
agentList = agent;
notifyDataSetChanged();
}
class CustomViewHolder extends RecyclerView.ViewHolder {
protected TextView textViewAgentName;
protected TextView textViewAgentPhone;
protected TextView textViewAgentRegion;
protected TextView textViewAgentStatus;
public CustomViewHolder(View view) {
super(view);
this.textViewAgentName = (TextView) view.findViewById(R.id.textAgentName);
this.textViewAgentPhone= (TextView) view.findViewById(R.id.textAgentPhone);
this.textViewAgentRegion = (TextView) view.findViewById(R.id.textAgentRegion);
this.textViewAgentStatus = (TextView) view.findViewById(R.id.textAgentStatus);
}
}
private OnItemClickListener onItemClickListener;
public OnItemClickListener getOnItemClickListener() {
return onItemClickListener;
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
That's my fragment and this is my Adapter
public class AgentAdapter extends RecyclerView.Adapter<AgentAdapter.CustomViewHolder> {
private List<Agent> agentList;
private Context mContext;
public AgentAdapter(Context context, List<Agent> agentList) {
this.agentList= agentList;
this.mContext = context;
}
#Override
public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.agent_row, null);
CustomViewHolder viewHolder = new CustomViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(CustomViewHolder customViewHolder, int i) {
final Agent agent = agentList.get(i);
//Setting text view title
customViewHolder.textViewAgentName.setText(agent.getAgentName());
customViewHolder.textViewAgentPhone.setText(agent.getAgentPhone());
customViewHolder.textViewAgentRegion.setText(agent.getRegion());
customViewHolder.textViewAgentStatus.setText(agent.getAgentStatus());
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
onItemClickListener.onItemClick(agent);
}
};
customViewHolder.textViewAgentName.setOnClickListener(listener);
}
#Override
public int getItemCount() {
return (null != agentList ? agentList.size() : 0);
}
public void updateAnswers(List<Agent>agent ) {
agentList = agent;
notifyDataSetChanged();
}
class CustomViewHolder extends RecyclerView.ViewHolder {
protected TextView textViewAgentName;
protected TextView textViewAgentPhone;
protected TextView textViewAgentRegion;
protected TextView textViewAgentStatus;
public CustomViewHolder(View view) {
super(view);
this.textViewAgentName = (TextView) view.findViewById(R.id.textAgentName);
this.textViewAgentPhone= (TextView) view.findViewById(R.id.textAgentPhone);
this.textViewAgentRegion = (TextView) view.findViewById(R.id.textAgentRegion);
this.textViewAgentStatus = (TextView) view.findViewById(R.id.textAgentStatus);
}
}
private OnItemClickListener onItemClickListener;
public OnItemClickListener getOnItemClickListener() {
return onItemClickListener;
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
and this is my MainActivity
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
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);
//add this line to display menu1 when the activity is loaded
displaySelectedScreen(R.id.nav_menu2);
}
#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) {
displaySelectedScreen(item.getItemId());
return true;
}
private void displaySelectedScreen(int itemId) {
//creating fragment object
Fragment fragment = null;
//initializing the fragment object which is selected
switch (itemId) {
case R.id.nav_menu1:
fragment = new caseFragment();
break;
case R.id.nav_menu2:
fragment = new testFragment();
break;
}
//replacing the fragment
if (fragment != null) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, fragment);
ft.commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
}
when i tried to open my fragment, the app crashed and the logcat is blank.
previously i could show my json data from activity but now when i tried to use fragment instead, it crashed.
Im using java and android studio.
Anyone know why? Thx in advance.

how to perform an action by selecting an item from the recyclerView on the fragment

I am using the navigation drawer template in the Android Studio
I use one activity only ... fragments are replaced over that one activity
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);
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.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
// here I call the fragment
FragmentManager fm=getFragmentManager();
fm.beginTransaction().replace(R.id.content_main_frame, new homeFragment()).commit();
}
#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;
}
}
public class homeFragment extends Fragment{
RecyclerView recyclerView;
String[] fields={"ALV","NIJU","AJITH","ASWIN"};
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
//for getting recyclerview id
recyclerView= (RecyclerView) rootView.findViewById(R.id.recyclerView_home);
// for specifying layout manager
LinearLayoutManager manager=new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(manager);
homeListAdapter adapter = new homeListAdapter(this.getActivity(), fields);
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
return rootView;
}
}
public class homeListAdapter extends RecyclerView.Adapter<homeListAdapter.homeViewHolder> {
private Context context;
private String[] field;
public homeListAdapter(Context context, String[] field){
this.context=context;
this.field=field;
}
#Override
public homeViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater=LayoutInflater.from(parent.getContext());
View view = inflater.from(parent.getContext()).inflate(R.layout.item_home,parent,false);
homeViewHolder viewHolder= new homeViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(homeViewHolder holder, int position) {
holder.card_home_title.setText(field[position]);
}
#Override
public int getItemCount() {
return field.length;
}
// View holder
public static class homeViewHolder extends RecyclerView.ViewHolder{
public CardView card_view;
public TextView card_home_title;
public homeViewHolder(View itemView) {
super(itemView);
card_view = (CardView) itemView.findViewById(R.id.card_view);
card_home_title = (TextView) itemView.findViewById(R.id.card_text);
}
}
}
public class ItemHome implements Serializable {
public int id;
public String title;
}
When I press ALV I want to replace by this alvfragment, and when I press the Niju I want to display this Nijufragment.
Screenshot:

If i understand you correctly you want to replace fragments from the navigation drawer, For that you need to go to MainActivty and this is an example for how to do that:
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
//use here the desired nav
} else if (id == R.id.nav_ALV) {
FragmentManager fm=getFragmentManager();
fm.beginTransaction().replace(R.id.content_main_frame, new ALVFragment).commit();

Android Fragment Orientation Causes Attach Issues

Hello everyone I have a question on rotating fragments and restoring them after detaching them. Currently I have three fragments: Fragment_Data, Fragment_Log, and Fragment_Control. My problem is if I rotate Fragment_Data, then detach and add Fragment_Log, then detach Fragment_Log and attempt to attach Fragment Data it fails to reattach. If I keep the device vertical and repeat the same steps the fragments don't have any issues reattaching. I try to detach, add, and attach the fragments in my PanelManager method.
What exactly is going one during the lifecycle of the Fragment_Data that causes issues when trying to reattach?
MainActivty.java
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, FragmentControl.ButtonSetListener{
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentControlTransction = fragmentManager.beginTransaction();
FragmentTransaction fragmentDataTransaction = fragmentManager.beginTransaction();
FragmentControl fragmentControl = new FragmentControl();
FragmentData fragmentData = new FragmentData();
FragmentLog fragmentLog = new FragmentLog();
FragmentGraph fragmentGraph = new FragmentGraph();
//Create Fragment Manager
FragmentManager panelManager = getFragmentManager();
//Boolean values for panels
boolean data_panel = true; //True because it is the first panel created in the View; id = 1
boolean log_panel = false; //id = 2
boolean graph_panel = false; //id = 3
#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.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
// However, if we're being restored from a previous state,
// then we don't need to do anything and should return or else
// we could end up with overlapping fragments.
if(savedInstanceState != null){
return;
}
//Generate Fragment_Data and Fragment_Control Panels
//These are the first two panels introduced into the app
fragmentControlTransction.add(R.id.fragment_control_panel, fragmentControl, "control");
fragmentControlTransction.commit();
fragmentDataTransaction.add(R.id.fragment_data_panel, fragmentData, "data");
fragmentDataTransaction.commit();
}
#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.data_log) {
PanelManager(2);
} else if (id == R.id.data_graph) {
PanelManager(3);
} else if (id == R.id.nav_share) {
PanelManager(1);
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private void PanelManager(int panel_id){
if(panel_id == 1){
//detach any panel attached to the fragment_data_panel
panelManager.beginTransaction().detach(getFragmentManager().findFragmentById(R.id.fragment_data_panel)).commit();
//Switch to data panel since it already exists
panelManager.beginTransaction().attach(fragmentData).commit();
} else if(panel_id == 2){
//detach any panel attached to the fragment_data_panel
panelManager.beginTransaction().detach(getFragmentManager().findFragmentById(R.id.fragment_data_panel)).commit();
//Switch to log panel
if(log_panel == false){
//If log panel is false, create log_panel for the first time
log_panel = true;
panelManager.beginTransaction().add(R.id.fragment_data_panel, fragmentLog).commit();
} else {
//Log_panel exists, so just attach fragment back
panelManager.beginTransaction().attach(fragmentLog).commit();
}
} else if(panel_id == 3){
//detach any panel attached to the fragment_data_panel
panelManager.beginTransaction().detach(getFragmentManager().findFragmentById(R.id.fragment_data_panel)).commit();
//Switch to graph panel
if(graph_panel == false){
//If log panel is false, create graph_panel for the first time
graph_panel = true;
panelManager.beginTransaction().add(R.id.fragment_data_panel, fragmentGraph).commit();
} else {
//Log_panel exists, so just attach fragment back
panelManager.beginTransaction().attach(fragmentGraph).commit();
}
}
}
//Call updateList method in FragmentLog to update ListView
#Override
public void app_log_update(String data, int icon) {
FragmentLog fragmentLog = (FragmentLog)getFragmentManager().findFragmentById(R.id.fragment_data_panel);
fragmentLog.updateList(data, icon);
}
}
FragmentData.java
public class FragmentData extends Fragment implements View.OnClickListener{
public EditText message_text;
public TextView display_message;
public Button button;
public String return_message = null;
boolean has_text_entered = false;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
return_message = savedInstanceState.getCharSequence("savedText").toString();
}
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_data, container, false);
button = (Button)view.findViewById(R.id.set_text_button);
button.setOnClickListener(this);
display_message = (TextView) view.findViewById(R.id.display_message);
display_message.setText("This is a temp statement");
if(return_message != null){
display_message = (TextView) view.findViewById(R.id.display_message);
display_message.setText(return_message);
}
return view;
}
#Override
public void onClick(View v) {
has_text_entered = true;
message_text = (EditText)getActivity().findViewById(R.id.text_message);
String message = message_text.getText().toString();
display_message = (TextView)getActivity().findViewById(R.id.display_message);
display_message.setText(message);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
TextView text = (TextView)getActivity().findViewById(R.id.display_message);
CharSequence userText = text.getText();
if(userText != null){outState.putCharSequence("savedText", userText);}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
}
Thank you for the help everyone!

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

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