Develop Reference

How to implement a Fragment in RecyclerView.Adapter

Good day How can I call a fragment when the users will click the card inside MyAdapter class. I want to replace view from the adapter. I am using recyclerview wants to perform click event using the view from my row layout.
Like for example when the user clicks the card it will open a fragment and it will show more data. Hope you can help me guys.
This is my main fragment
AccountsFragment
ReceivableFragment
LoanAppFragment
Those fragments hold different data. when the user clicks the cards inside that fragment it will call another fragment the SLDTLFragment.
Btw this MyAdapter.java
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
private List<Datas> mDataset;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class MyViewHolder extends RecyclerView.ViewHolder {
public CardView mCardView;
public TextView account_type;
public TextView accnt_description;
public TextView balance_label;
public TextView account_balance;
public MyViewHolder(View v) {
super(v);
mCardView = (CardView) v.findViewById(R.id.card_view);
account_type = (TextView) v.findViewById(R.id.lblShareCapital);
balance_label = (TextView) v.findViewById(R.id.lblAvailableBalance);
accnt_description = (TextView) v.findViewById(R.id.sl_desc);
account_balance = (TextView) v.findViewById(R.id.actual_balance);
}
}
public MyAdapter(List<Datas> myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
#Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_item, parent, false);
// set the view's size, margins, paddings and layout parameters
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
#Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
//holder.account_type.setText(mDataset[position]);
Datas datas = mDataset.get(position);
holder.accnt_description.setText(datas.getSL_DESC());
holder.account_balance.setText(datas.getACTUAL_BALANCE());
holder.mCardView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// String sl_desc = mDataset.get(position).getSL_DESC();
// String actual_balance = mDataset.get(position).getACTUAL_BALANCE();
String sle = mDataset.get(position).getSLE();
String slc = mDataset.get(position).getSLC();
String slt = mDataset.get(position).getSLT();
String ref_no = mDataset.get(position).getREF();
Log.d("CardView Clicked", "sle code: " + sle);
Log.d("CardView Clicked", "slc code: " + slc);
Log.d("CardView Clicked", "slt code: " + slt);
Log.d("CardView Clicked", "ref no: " + ref_no);
}
});
}
#Override
public int getItemCount() {
return mDataset.size();
}
}
AccountsFragment.java
public class AccountsFragment extends Fragment {
private SQLiteHandler db;
public AccountsFragment() {
// 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_accounts, container, false);
RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view);
rv.setHasFixedSize(true);
SQLiteHandler db = new SQLiteHandler(getActivity());
MyAdapter adapter = new MyAdapter(db.getUserSLDetails());
rv.setAdapter(adapter);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
rv.setLayoutManager(llm);
return rootView;
}
}
ReceivableFragment.java
public class ReceivableFragment extends Fragment {
public ReceivableFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_receivable, container, false);
RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view);
rv.setHasFixedSize(true);
SQLiteHandler db = new SQLiteHandler(getActivity());
MyAdapter adapter = new MyAdapter(db.getUserSLARLoans());
rv.setAdapter(adapter);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
rv.setLayoutManager(llm);
return rootView;
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
private TextView nav_header_name;
private TextView nav_header_email;
public TextView txtLogOut;
private SQLiteHandler db;
private SessionManager session;
private Timer timer;
private Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Will replace the activity_main.xml to relativelayout_for_fragment.xml
if (savedInstanceState == null) {
AccountsFragment f1= new AccountsFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.relativelayout_for_fragment, f1);// relativelayout_for_fragment is inside the content_main.xml
fragmentTransaction.commit();
}
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);
View header=navigationView.getHeaderView(0);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem item) {
txtLogOut = (TextView) findViewById(R.id.nav_logout_menu);
int id = item.getItemId();
if (id == R.id.nav_deposit) {
// Handle the preference action
AccountsFragment accounts= new AccountsFragment();
FragmentManager manager= getSupportFragmentManager();
manager.beginTransaction()
.replace(R.id.relativelayout_for_fragment, accounts)
.commit();
Toast.makeText(MainActivity.this, "Deposit Accounts", Toast.LENGTH_SHORT).show();
}else if (id == R.id.nav_receivable) {
// Handle the Loan application();
ReceivableFragment receivable= new ReceivableFragment();
FragmentManager manager= getSupportFragmentManager();
manager.beginTransaction()
.replace(R.id.relativelayout_for_fragment, receivable)
.commit();
Toast.makeText(MainActivity.this, "AR and Loan Accounts", Toast.LENGTH_SHORT).show();
}else if (id == R.id.nav_apply_loan_menu) {
// Handle the Loan application();
LoanAppFragment loan_app= new LoanAppFragment();
FragmentManager manager= getSupportFragmentManager();
manager.beginTransaction()
.replace(R.id.relativelayout_for_fragment, loan_app)
.commit();
Toast.makeText(MainActivity.this, "This module is under developement", Toast.LENGTH_SHORT).show();
}else if (id == R.id.nav_logout_menu) {
// Handle the About action
logoutUser();
//Toast.makeText(MainActivity.this, "successfully Logout", Toast.LENGTH_LONG).show();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
});
nav_header_name = (TextView) header.findViewById(R.id.nav_name);
nav_header_email = (TextView) header.findViewById(R.id.nav_email);
// SqLite database handler
db = new SQLiteHandler(getApplicationContext());
// session manager
session = new SessionManager(getApplicationContext());
if (!session.isLoggedIn()) {
logoutUser();
}
//Fetching user details from SQLite
HashMap<String, String> user = db.getUserDetails();
String username = user.get("username");
String email = user.get("email");
//Displaying the user info in nav_header_main.xml
nav_header_name.setText(username);
nav_header_email.setText(email);
}
#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);
}
/**
* Logging out the user. Will set isLoggedIn flag to false in shared
* preferences Clears the user data from sqlite users table
* */
private void logoutUser() {
session.setLogin(false);
db.deleteUsers();
db.deleteUserSLDTL();
// Launching the login activity
Intent intent = new Intent(MainActivity.this, LoginActivity.class);
startActivity(intent);
finish();
}
#Override
protected void onPause() {
super.onPause();
timer = new Timer();
Log.i("Main", "Invoking logout timer");
LogOutTimerTask logoutTimeTask = new LogOutTimerTask();
timer.schedule(logoutTimeTask, 30000); // auto logout in 30secs inactivity
Log.i("Main", "Log out user due to inactivity");
}
#Override
protected void onResume() {
super.onResume();
if (timer != null) {
timer.cancel();
Log.i("Main", "cancel timer");
timer = null;
}
}
private class LogOutTimerTask extends TimerTask {
#Override
public void run() {
session.setLogin(false);
db.deleteUsers();
db.deleteUserSLDTL();
//redirect user to login screen
Intent i = new Intent(MainActivity.this, LoginActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
finish();
}
}
}

You need to use Listener/Callback pattern to inform your Activity or Fragment where the Adapter is used. Do not directly call a Fragment or activity inside of the Adapter because it will defeat the purpose of the Adapter. Adapter should only be used to show the data.
To implement the pattern, first create the interface and constructor to set the listener in your Adapter:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
...
private List<Datas> mDataset;
private ClickListener mListener;
public interface ClickListener {
void onItemClicked(YourData yourData);
}
public MyAdapter(List<Datas> myDataset, ClickListener listener) {
mDataset = myDataset;
mListener = listener;
}
...
}
Second, whenever there is a click of the item data, tell the listener with the following code in your Adapter:
#Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
...
holder.mCardView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// String sl_desc = mDataset.get(position).getSL_DESC();
// String actual_balance = mDataset.get(position).getACTUAL_BALANCE();
// String sle = mDataset.get(position).getSLE();
// String slc = mDataset.get(position).getSLC();
// String slt = mDataset.get(position).getSLT();
// String ref_no = mDataset.get(position).getREF();
// Simplify the above to a pojo. We assume the pojo is YourData
YourData data = new YourData();
// set the data from above.
mListener.onItemClicked(yourData);
});
}
Third, you need to set the listener in your Activity/Fragment which using the Adapter with:
MyAdapter.ClickListener listener = new MyAdapter.ClickListener() {
#Override
public void onItemClicked(YourData yourData) {
// Do something with the data here.
}
};
MyAdapter adapter = new MyAdapter(db.getUserSLARLoans(), listener);
rv.setAdapter(adapter);
You need to handle the data in your listener inside the onItemClicked() method above.

try to pass getFragmentManager using constructor and then replace the view with container view in your item row.
//constructor
public MyAdapter(FragmentManager fragment, List<Datas> myDataset) {
mDataset = myDataset;
mFragment = fragment;
}
public static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public CardView mCardView;
public TextView account_type;
public TextView accnt_description;
public TextView balance_label;
public TextView account_balance;
public MyViewHolder(View v){
super(v);
mCardView = (CardView) v.findViewById(R.id.card_view);
account_type = (TextView) v.findViewById(R.id.lblShareCapital);
balance_label = (TextView) v.findViewById(R.id.lblAvailableBalance);
accnt_description = (TextView) v.findViewById(R.id.sl_desc);
account_balance = (TextView) v.findViewById(R.id.actual_balance);
mCardView.setOnClickListener(this)
}
#Override
public void onClick(View view){
mFragment.beginTransaction().replace(R.id.containerRow,new MyFragment()).commit();
}
}
//note this is not tested code.

Android Navigation Drawable send spinnern value to fragment

i have used navigation drawable from android studio 2.2.3 with fragments as frag1,frag2
I want to send selected spinner values to all fragments,
i have managed to send first selected spinner item to all fragments using bundle but when i select the second item from spinner item list
nothing work,here is my codes
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
String data1;
#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);
//add this line to display menu1 when the activity is loaded
displaySelectedScreen(R.id.nav_menu1);
}
#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);
ArrayList<String> list = new ArrayList<String>();
list.add("Top News");
list.add("Politics");
list.add("Business");
list.add("Sports");
list.add("Movies");
MenuItem item = menu.findItem(R.id.spinner);
Spinner spinner = (Spinner) MenuItemCompat.getActionView(item);
spinner.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, list));
data1=spinner.getSelectedItem().toString();
Toast.makeText(MainActivity.this, spinner.getSelectedItem().toString(),Toast.LENGTH_LONG).show();
return true;
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
int id = item.getItemId();
displaySelectedScreen(item.getItemId());
return true;
}
private void displaySelectedScreen(int itemId) {
//creating fragment object
Fragment fragment = null;
switch (itemId) {
case R.id.nav_menu1:
fragment = new frag1();
break;
case R.id.nav_menu2:
fragment = new frag2();
Bundle data2 = new Bundle();
data2.putString("data", data1);
fragment.setArguments(data2);
break;
case R.id.nav_menu3:
fragment = new frag3();
Bundle data = new Bundle();
data.putString("data", data1);
fragment.setArguments(data);
break;
}
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);
}
}
public class frag2 extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_menu_3, container, false);
TextView text = (TextView) view.findViewById(R.id.textView3);
String getArgument = getArguments().getString("data");
text.setText(getArgument);
return view;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getActivity().setTitle("Menu 1");
}
}
So where and how can i modify or my codes so that
1.i can send the selected spinner item to all fragments ?
2.i can retain the state of selected spinner value when navigate between fragments ?

Use onItemSelected listener and perform operation you want to perform there
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
//Here
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});

How to go back from Fragment to Fragment?

How I go to the previous fragment when I click on back button.
RecyclerAdapter_1_ten.java
public class RecyclerAdapter_1_ten extends RecyclerView.Adapter<RecyclerAdapter_1_ten.ViewHolder> {
private String[] SubTxt = {"NCERT Solution",
"Notes"};
private int[] SubImage = {R.drawable.ic_answers_black_48dp,
R.drawable.ic_notes_black_48dp};
Activity activity;
public RecyclerAdapter_1_ten(Activity activity) {
this.activity = activity;
}
class ViewHolder extends RecyclerView.ViewHolder {
public int currentItem;
public ImageView itemImage;
public TextView itemTitle;
public ViewHolder(View itemView) {
super(itemView);
itemImage = (ImageView) itemView.findViewById(R.id.SubImage);
itemTitle = (TextView) itemView.findViewById(R.id.SubTxt);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int position = getAdapterPosition();
switch (position) {
case 0:
android.app.FragmentManager fm = activity.getFragmentManager();
fm.beginTransaction().replace(R.id.content_frame, new SecondClass_10()).commit();
case 1:
Snackbar.make(v, "Comming Soon " + position,
Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
}
});
}
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.recycler_1_9, viewGroup, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
viewHolder.itemTitle.setText(SubTxt[i]);
viewHolder.itemImage.setImageResource(SubImage[i]);
}
#Override
public int getItemCount() {
return SubTxt.length;
}
}
SecondClass_10.java
public class SecondClass_10 extends Fragment {
RecyclerView recyclerView;
RecyclerView.LayoutManager layoutManager;
RecyclerView.Adapter adapter;
View rootview;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootview = inflater.inflate(R.layout.second_class_10, container, false);
recyclerView = (RecyclerView) rootview.findViewById(R.id.recycler_ten_page_second);
layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
adapter = new RecyclerAdapter_2_ten();
recyclerView.setAdapter(adapter);
return rootview;
}
}
MainActivity.java
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);
android.app.FragmentManager fm = getFragmentManager();
fm.beginTransaction().replace(R.id.content_frame, new FirstClass_9()).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.
android.app.FragmentManager fn = getFragmentManager();
int id = item.getItemId();
if (id == R.id.nav_9) {
fn.beginTransaction().replace(R.id.content_frame, new FirstClass_9()).commit();
} else if (id == R.id.nav_10) {
fn.beginTransaction().replace(R.id.content_frame, new FirstClass_10()).commit();
} else if (id == R.id.nav_11) {
fn.beginTransaction().replace(R.id.content_frame, new FirstClass_11()).commit();
} else if (id == R.id.nav_12) {
fn.beginTransaction().replace(R.id.content_frame, new FirstClass_12()).commit();
} else if (id == R.id.nav_aboutUs) {
} else if (id == R.id.nav_feedback) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
I follow many Tutorial but I didn't get solution Hope I'll get answer here. I have added recyclerview when I click on it it open fragment but when I click on back button instead of going back it goes to first Page.
How to go back to Fragment from Fragment when I click on Back button?

You can use Stack for holding the fragment instances. When you move to the next fragment push the fragment into the stack and detach it from your activity and in the onbackpressed event pop the fragment and attach it to the activity.

This is one of the best explanation that i came across when i started in SO for fragment navigation i hope it helps clear your understanding of how they work.
Android fragments navigation and backstack

Update an TextView in NavigationDrawer after input from user in previous activity

There is some information that I want to display in the NavigationDrawer. This information is entered by the user in a previous activity. I use an intent to send the information to the Main Activity for the Drawer.
MainActivity (After user entered details)
public class MainActivity extends AppCompatActivity implements FragmentDrawer.FragmentDrawerListener {
private static String TAG = MainActivity.class.getSimpleName();
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
String info = intent.getStringExtra("info");
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
// display the first navigation drawer view on app launch
displayView(0);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_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;
}
if(id == R.id.action_search){
Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
private void displayView(int position) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (position) {
case 0:
fragment = new HomeFragment();
title = getString(R.string.nav_item_dashboard);
break;
......
}
I have a specific layout for the navigation drawer and it contains a textview which I want to update with the String test. This is the fragment code and the xml for it.
FragmentDrawer Class
public FragmentDrawer() {
}
public void setDrawerListener(FragmentDrawerListener listener) {
this.drawerListener = listener;
}
public static List<NavDrawerItem> getData() {
List<NavDrawerItem> data = new ArrayList<>();
// preparing navigation drawer items
for (int i = 0; i < titles.length; i++) {
NavDrawerItem navItem = new NavDrawerItem();
navItem.setTitle(titles[i]);
navItem.setIcon(icons.getResourceId(i,-1));
data.add(navItem);
}
return data;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// drawer labels
titles = getActivity().getResources().getStringArray(R.array.nav_drawer_labels);
icons = getResources().obtainTypedArray(R.array.nav_drawer_icons);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflating view layout
View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
recyclerView = (RecyclerView) layout.findViewById(R.id.drawerList);
TextView userID = (TextView) layout.findViewById(R.id.nav_title_user);
adapter = new NavigationDrawerAdapter(getActivity(), getData());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new ClickListener() {
#Override
public void onClick(View view, int position) {
drawerListener.onDrawerItemSelected(view, position);
mDrawerLayout.closeDrawer(containerView);
}
#Override
public void onLongClick(View view, int position) {
}
}));
return layout;
}
public void setUp(int fragmentId, DrawerLayout drawerLayout, final Toolbar toolbar) {
containerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getActivity().invalidateOptionsMenu();
}
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
getActivity().invalidateOptionsMenu();
}
#Override
public void onDrawerSlide(View drawerView, float slideOffset) {
super.onDrawerSlide(drawerView, slideOffset);
toolbar.setAlpha(1 - slideOffset / 2);
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mDrawerToggle.syncState();
}
});
}
FramgentDrawer.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white">
<RelativeLayout
android:id="#+id/nav_header_container"
android:layout_width="match_parent"
android:layout_height="140dp"
android:layout_alignParentTop="true"
android:background="#color/colorPrimary">
......
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceInverse"
android:text="#string/welcome_user"
android:id="#+id/nav_title_user"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="10dp"/>
</RelativeLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/drawerList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:layout_below="#id/nav_header_container" />
I have managed to update the list in the drawer with Icons, Labels and a Header. I have done so by using a RecyclerViewAdapter.
The problem that I am having is that these details were from the resources (strings.xml).
How can I update a textview on a NavigationFragment when it has been created? How can I send a value to the fragment so that it will be used during OnCreateView of the fragment?

I was looking too much into it. The solution was quite simple...Even though it took me 3 hrs to figure this out :/
In the NavigationFragment, I created a method to update a textview with a string. In the MainActivity where I get the information from the intent, I just called the method like this:
drawerFragment.setUserTextView(info);
This is why taking breaks are important... ^^

How to maintain multiple fragments on the resume of parent activity

I am using navigation drawer which calls multiple fragments on the click of a list item of navigation drawer.
In my scenario, parent activity handles 2 fragments. There is an expected behavior that I am facing in handling these fragments.
Here is what I am doing:
Go to offline mode -> Go to fragment 2 -> Minimize the app -> Go to online mode ( switch on the internet ) - > Resume the app
On resume of the app, the parent activity is called and in parent activity, by default fragment 1 is opened, rather it should open fragment 2.
Help is appreciated.
Here is my navigation drawer code -
public class NavigationDrawer extends ActionBarActivity implements OnItemClickListener {
private ActionBar actionBar;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
RelativeLayout user_panel;
LinearLayout mylinearlayout;
private ActionBarDrawerToggle mDrawerToggle;
// Initialize SharedPreferences and editor variable's.
SharedPreferences.Editor editor;
SharedPreferences pref;
String username;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_drawer);
// Initialize SharedPreferences mode
pref = getApplicationContext().getSharedPreferences("MyPref", 0);
editor = pref.edit();
username = pref.getString("name", null); // getting String
moveDrawerToTop();
initActionBar();
initDrawer();
//Quick cheat: Add Fragment 1 to default view
onItemClick(null, null, 0, 0);
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
private void moveDrawerToTop() {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
DrawerLayout drawer = (DrawerLayout) inflater.inflate(R.layout.decor, null); // "null" is important.
// HACK: "steal" the first child of decor view
ViewGroup decor = (ViewGroup) getWindow().getDecorView();
View child = decor.getChildAt(0);
decor.removeView(child);
LinearLayout container = (LinearLayout) drawer.findViewById(R.id.drawer_content); // This is the container we defined just now.
container.addView(child, 0);
drawer.findViewById(R.id.drawer).setPadding(0, getStatusBarHeight(), 0, 0);
ImageView profile = (ImageView) drawer.findViewById(R.id.image_view);
profile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
// Make the drawer replace the first child
decor.addView(drawer);
}
public int getStatusBarHeight() {
int result = 0;
int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = getResources().getDimensionPixelSize(resourceId);
}
return result;
}
private int getContentIdResource() {
return getResources().getIdentifier("content", "id", "android");
}
#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.
mDrawerToggle.syncState();
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
int id = item.getItemId();
if (id == R.id.notification) {
Intent display_notify = new Intent(getApplicationContext(), DisplayActivity.class);
startActivity(display_notify);
return true;
}
return super.onOptionsItemSelected(item);
}
private void initActionBar() {
actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
}
private void initDrawer() {
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mylinearlayout = (LinearLayout) findViewById(R.id.drawer);
mDrawerLayout.setDrawerListener(createDrawerToggle());
mDrawerList = (ListView) findViewById(R.id.MyList);
user_panel = (RelativeLayout) findViewById(R.id.user_profile_panel);
user_panel.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
TextView user_name = (TextView) findViewById(R.id.left_panel_user_name);
user_name.setText(username);
ListAdapter adapter = (ListAdapter) (new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, getResources().getStringArray(R.array.nav_items)));
mDrawerList.setAdapter(adapter);
mDrawerList.setOnItemClickListener(this);
}
private DrawerListener createDrawerToggle() {
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close) {
#Override
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
}
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
}
#Override
public void onDrawerStateChanged(int state) {
}
};
return mDrawerToggle;
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
mDrawerLayout.closeDrawer(mylinearlayout);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction ftx = fragmentManager.beginTransaction();
if (position == 0) {
ftx.replace(R.id.main_content, new FragmentOne());
} else if (position == 1) {
ftx.replace(R.id.main_content, new FragmentSecond());
} else if (position == 2) {
} else if (position == 3) {
} else if (position == 4) {
invitation();
} else if (position == 5) {
launchMarket();
} else if (position == 6) {
ftx.replace(R.id.main_content, new Setting_Fragment());
}
ftx.commit();
}
}