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pass string from activity to fragment [duplicate]

This question already has answers here:
how to pass string data from activity to fragment?
(5 answers)
Closed 5 years ago.
My problem is passing string from activity to fragment. I researched for a whole day and my problem isn't solved.
activity :
if(email.matches(users.user1)&&password.matches(users.pass1)){
Intent intent = new Intent(LoginActivity.this,MainActivity.class);
Bundle bundle = new Bundle();
bundle.putString("user", users.name);
ProfileFragment fragobj = new ProfileFragment();
fragobj.setArguments(bundle);
startActivity(intent);
}
fragment :
public class ProfileFragment extends Fragment {
public static ProfileFragment newInstance() {
return new ProfileFragment();
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_profile, container, false);
String user = getArguments().getString("user");
TextView textView = v.findViewById(R.id.namef1);
textView.setText(user);
return inflater.inflate(R.layout.fragment_profile, container, false);
}
}
MainActivity
public class MainActivity extends Activity {
private BottomNavigationView mBottomNavigationView;
private Toolbar supportActionBar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupBottomNavigation();
if (savedInstanceState == null) {
loadHomeFragment();
}
}
private void setupBottomNavigation() {
mBottomNavigationView =findViewById(R.id.bottom_navigation);
mBottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.action_home:
loadHomeFragment();
return true;
case R.id.action_profile:
loadProfileFragment();
return true;
case R.id.action_settings:
loadSettingsFragment();
return true;
}
return false;
}
});
}
private void loadHomeFragment() {
HomeFragment fragment = HomeFragment.newInstance();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_frame, fragment);
ft.commit();
}
private void loadProfileFragment() {
ProfileFragment fragment = ProfileFragment.newInstance();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_frame, fragment);
ft.commit();
}
private void loadSettingsFragment() {
SettingsFragment fragment = SettingsFragment.newInstance();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragment_frame, fragment);
ft.commit();
}
public void setSupportActionBar(Toolbar supportActionBar) {
this.supportActionBar=supportActionBar;
}
}
as it shown in code user has login and one of his data display in a profile fragment . I wanna display this string as Textview in profilefragment .
anybody have an idea?

Move below part of code to the place where you are adding the ProfileFragment to Activity.
Bundle bundle = new Bundle();
bundle.putString("user", users.name);
ProfileFragment fragobj = new ProfileFragment();
fragobj.setArguments(bundle);

Bottom menu bar goes blank by clicking second time on menu options

I have a problem with my Bottom bar in android. when i click on the bottom menu options it goes blank. Please help me out to fine what is the basic problem. Where is am I wrong.
It shows no error or exception in logcat.
Here is my code
public class BottomBarActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bottom_bar);
final BottomNavigationView bottomNavigationView = (BottomNavigationView) findViewById(R.id.navigation);
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
// Fragment selectedFragment = null;
switch (item.getItemId()) {
case R.id.action_library:
FragmentLibrary fragmentLibrary = new FragmentLibrary();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.frame_layout1, fragmentLibrary);
fragmentTransaction.commit();
Toast.makeText(BottomBarActivity.this, "Library", Toast.LENGTH_SHORT).show();
break;
case R.id.action_notification:
//002
Fragment selectedFragmentNotification = FragmentNotification.newInstance();
FragmentTransaction fragmentTransactionNotification = getSupportFragmentManager().beginTransaction();
fragmentTransactionNotification.replace(R.id.frame_layout1, selectedFragmentNotification);
fragmentTransactionNotification.commit();
Toast.makeText(BottomBarActivity.this, "Notifications", Toast.LENGTH_SHORT).show();
break;
case R.id.action_more:
Fragment selectedFragmentMore = FragmentMore.newInstance();
FragmentTransaction fragmentTransactionMore = getSupportFragmentManager().beginTransaction();
fragmentTransactionMore.replace(R.id.frame_layout1, selectedFragmentMore);
fragmentTransactionMore.commit();
Toast.makeText(BottomBarActivity.this, "More", Toast.LENGTH_SHORT).show();
break;
case R.id.action_discovered:
Fragment selectedFragmentMain = FragmentMain.newInstance();
FragmentTransaction fragmentTransactionMain = getSupportFragmentManager().beginTransaction();
fragmentTransactionMain.replace(R.id.frame_layout1, selectedFragmentMain);
fragmentTransactionMain.commit();
Toast.makeText(BottomBarActivity.this, "Discover", Toast.LENGTH_SHORT).show();
break;
}
return true;
}
});
//Manually displaying the first fragment
Fragment selectedFragment = FragmentMain.newInstance();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame_layout1, selectedFragment);
fragmentTransaction.commit();
}
}
Here is the Fragment Class Code.
This fragment is called when I click one of the menu item.
public class FragmentLibrary extends Fragment {
private static final String ARG_POSITION = "position";
private int position;
private PagerSlidingTabStrip tabs_L;
private ViewPager pager_L;
public FragmentLibrary() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_library, container, false);
pager_L = (ViewPager) view.findViewById(R.id.pagerL);
pager_L.setAdapter(new MyAdapterLibrary(getFragmentManager()));
tabs_L = (PagerSlidingTabStrip) view.findViewById(R.id.tabsL);
tabs_L.setViewPager(pager_L);
return view;
}
// ADAPTER CLASS
public class MyAdapterLibrary extends FragmentPagerAdapter {
private String[] titles = {
getString(R.string.tab_title_current_reading),
getString(R.string.tab_title_reading_lists),
getString(R.string.tab_title_history)
};
public MyAdapterLibrary(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return FragmentCurrentReading.newInstance(position);
case 1:
return FragmentReadingLists.newInstance(position);
case 2:
return FragmentHistory.newInstance(position);
}
return null;
}
#Override
public int getCount() {
return titles.length;
}
#Override
public CharSequence getPageTitle(int position) {
return titles[position];
}
}
}

how to handle multiple fragments onbackpressed

The Main Activity having bottom navigation and contains 5 fragments in it. Each fragments having multiple fragment inside. how to handle the onbackpressed in it.
Homepage.java
public class Homepage extends AppCompatActivity {
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()) {
case R.id.home:
selectedFragment = Fragment_home.newInstance();
break;
case R.id.eventsfeed:
selectedFragment = Fragment_eventsfeed.newInstance();
break;
case R.id.events:
selectedFragment = Fragment_events.newInstance();
break;
case R.id.messages:
selectedFragment = Fragment_messages.newInstance();
break;
case R.id.settings:
selectedFragment = Fragment_settings.newInstance();
break;
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.content, selectedFragment);
transaction.commit();
return true;
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.homepage);
Fragment fragmentnewview = new Fragment_home();
FragmentManager frMan = getSupportFragmentManager();
FragmentTransaction frTr = frMan.beginTransaction();
frTr.add(R.id.content,fragmentnewview);
frTr.commit();
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
BottomNavigationViewHelper.disableShiftMode(navigation);
}}
Fragment_home.java
public class Fragment_home extends Fragment {
public static Fragment_home newInstance(){
Fragment_home fragment=new Fragment_home();
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view=inflater.inflate(R.layout.fragment_home, container, false);
CardView card=(CardView)view.findViewById(R.id.next_page_home_card);
card.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
view.setVisibility(View.GONE);
Fragment fragmentnewview = new Event_details();
FragmentManager frMan = getActivity().getSupportFragmentManager();
FragmentTransaction frTr = frMan.beginTransaction();
frTr.add(R.id.content,fragmentnewview);
frTr.commit();
}
});
return view;
}
}
Inside that Fragment_home.java i have a card view when it clicked it goes to next fragment Event_Details.java
Event_Details.java
public class Event_details extends Fragment {
Button add_comments;
ImageButton back;
public static Event_details newInstance(){
Event_details fragment=new Event_details();
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view=inflater.inflate(R.layout.event_details, container, false);
add_comments=(Button)view.findViewById(R.id.add_comment);
back=(ImageButton)view.findViewById(R.id.back);
back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
view.setVisibility(View.GONE);
Fragment fragmentnewview = new Fragment_home();
FragmentManager frMan = getActivity().getSupportFragmentManager();
FragmentTransaction frTr = frMan.beginTransaction();
frTr.add(R.id.content,fragmentnewview);
frTr.commit();
}
});
add_comments.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
view.setVisibility(View.GONE);
Fragment fragmentnewview = new Comments();
FragmentManager frMan = getActivity().getSupportFragmentManager();
FragmentTransaction frTr = frMan.beginTransaction();
frTr.add(R.id.content,fragmentnewview);
frTr.commit();
}
});
return view;
}
}
i have a button in Event_Details.java when clicked that it calls another fragment Comments.java
Comments.java
public class Comments extends Fragment {
ImageButton back;
public static Comments newInstance(){
Comments fragment=new Comments();
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view=inflater.inflate(R.layout.add_your_comments, container, false);
back=(ImageButton)view.findViewById(R.id.back);
back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
view.setVisibility(View.GONE);
Fragment fragmentnewview = new Event_details();
FragmentManager frMan = getActivity().getSupportFragmentManager();
FragmentTransaction frTr = frMan.beginTransaction();
frTr.add(R.id.content,fragmentnewview);
frTr.commit();
}
});
return view;
}
}
back.setOnClickListener is the image button to go back but i can't implement in the hardware back button.

You need to #Override your activity onBackPressed() method !!!
There are many good information and answers about your question ! if you want to become good programmer you need good research skills!!! :))
Try to research and solve the problem yourself . Write some code, and after all of it if you still can't resolve your problem i'll give you code for copy and paste :)

When you load a fragment, use addToBackStack(null) on the FragmentTransaction. If you do that, the back button will reverse the transaction.

#Override onBackPressed()
method as #L.Petrosyan told,
insideonBackPressed()get the current position of your viewpager usingviewPager.getCurrentItem();
it will return you anint` value. use that value to manage your code.

How to open a class that extends ListFragment on click of navigation drawer item?

In this function on click of nav_manage I want to open ViewTasks that extends ListFragment. Can someone please suggest some code example?
This is a function in my MainActivity.
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
displaySelectedScreen(item.getItemId());
return true;
}
private void displaySelectedScreen(int itemId)
{
Fragment fragment = null;
//initializing the fragment object which is selected
switch (itemId) {
case R.id.nav_send:
fragment = new Invitation();
break;
case R.id.nav_camera:
fragment=new Home();
break;
case R.id.nav_manage:
fragment=new ViewTasks();
break;
default:
Toast.makeText(MainActivity2.this,"Choose Something",Toast.LENGTH_LONG).show();
}
//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);
}
My ViewTasks class:
public class ViewTasks extends ListFragment {
private Button addButton;
private TaskManagerApplication app;
private TaskListAdapter adapter;
private Button removeButton;
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.home_fragment, container, false);
}
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
//you can set the title for your toolbar here for different fragments different titles
getActivity().setTitle("Task Scheduler");
app = (TaskManagerApplication)getActivity().getApplication();
adapter = new TaskListAdapter(this.getActivity(), app.getCurrentTasks());
setListAdapter(adapter);
setUpViews();
}
#Override
public void onResume() {
super.onResume();
adapter.forceReload();
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
adapter.toggleTaskCompleteAtPosition(position);
Task t = adapter.getItem(position);
app.saveTask(t);
}
protected void removeCompletedTasks() {
Long[] ids = adapter.removeCompletedTasks();
app.deleteTasks(ids);
}
private void setUpViews() {
addButton = (Button)getView().findViewById(R.id.add_button);
removeButton = (Button)getView().findViewById(R.id.remove_button);
addButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getFragmentManager()
.beginTransaction()
.replace(R.id.content_frame, new AddTaskActivity())
.commit();
}
});
removeButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
removeCompletedTasks();
}
});
}
}
I want this function to open the ViewTasks fragment which has listview of tasks scheduled.
When I follow the same pattern as my above case it shows this error:
Incompatible types:
Required: android.app.Fragment
Found: com.happy.taskmanager.ViewTasks

onTabChanged not work and fragment overlaps

I have a FragmentTabHost and have some problems with it on fragment switching. After attempting a fragment switch and then I click on another tab, the tab contents overlap. I then try to override the onTabChanged method (don't know whether it could be a solution though....), however I discover the onTabChanged does not be run!
--Update--
onTabChanged is now runnable but the overlap problem is still here.
here is my code:
MainActivity
public class MainActivity extends FragmentActivity implements OnTabChangeListener{
private static final String TAB = "MainActivity";
private FragmentTabHost tabMenu;
public static final String NEWS_TAB = "news";
public static final String SHARE_TAB = "share";
public static final String CAMERA_TAB = "camera";
public static final String STATUS_TAB = "status";
public static final String OTHER_TAB = "other";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tabMenu = (FragmentTabHost)findViewById(R.id.main_tabhost);
tabMenu.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);
String[] tabTitle = getResources().getStringArray(R.array.tab_title);
for (int i=0; i<tabTitle.length; i++){
String tagId = "";
int tabIconDrawable = 0;
Class tabClass = BlankTab.class;
switch(tabTitle[i]){
case "最新消息":
tabIconDrawable = R.drawable.ic_action_view_as_list;
tagId = this.NEWS_TAB;
tabClass = News.class;
break;
case "貨件分享":
tabIconDrawable = R.drawable.ic_action_important;
tagId = this.SHARE_TAB;
tabClass = GoodsShare.class;
break;
case "":
tabIconDrawable = R.drawable.ic_action_camera;
tagId = this.CAMERA_TAB;
break;
case "物流狀態":
tabIconDrawable = R.drawable.ic_action_airplane_mode_on;
tagId = this.STATUS_TAB;
tabClass = LogisticStatus.class;
break;
case "其他":
tabIconDrawable = R.drawable.ic_action_overflow;
tagId = this.OTHER_TAB;
tabClass = Others.class;
break;
}
View tabView = getLayoutInflater().inflate(R.layout.tab_layout, null, false);
ImageView tabIcon = (ImageView)tabView.findViewById(R.id.tab_icon);
TextView tabText = (TextView)tabView.findViewById(R.id.tab_title);
tabIcon.setImageDrawable(getResources().getDrawable(tabIconDrawable));
tabText.setText(tabTitle[i]);
TabSpec spec = tabMenu.newTabSpec(tagId).setIndicator(tabView);
tabMenu.addTab(spec, tabClass, null);
tabMenu.getTabWidget().getChildAt(i).setBackground(getResources().getDrawable(R.drawable.main_tab_selector));
}
tabMenu.setOnTabChangedListener(this);
}
#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.
return super.onOptionsItemSelected(item);
}
#Override
public void onTabChanged(String tabId) {
// TODO Auto-generated method stub
Log.d(TAB, tabId);
FragmentTransaction t = getSupportFragmentManager().beginTransaction();
Fragment fragment = null;
if (tabId.equals(this.NEWS_TAB)){
fragment = new News();
} else if (tabId.equals(this.SHARE_TAB)){
fragment = new GoodsShare();
} else if (tabId.equals(this.CAMERA_TAB)){
fragment = new Camera();
} else if (tabId.equals(this.STATUS_TAB)){
fragment = new LogisticStatus();
} else if (tabId.equals(this.OTHER_TAB)){
fragment = new Others();
}
if (fragment != null){
t.replace(android.R.id.tabcontent, fragment);
} else {
Log.e(TAB, "fragment creation error");
}
}
}
Others<---the one has fragment switching
public class Others extends Fragment{
private View view;
private Controller controller;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
controller = (Controller)this.getActivity().getApplication();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
view = inflater.inflate(R.layout.others, container, false);
setLayout();
return view;
}
private void setLayout(){
ListView othersMenu = (ListView)view.findViewById(R.id.others_menu);
String[] othersItem = getResources().getStringArray(R.array.others);
ArrayAdapter<String> adapter = new ArrayAdapter(getActivity(), android.R.layout.simple_list_item_1, othersItem);
othersMenu.setAdapter(adapter);
othersMenu.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
String item = (String)parent.getItemAtPosition(position);
Fragment fragment = null;
switch(item){
case "貨倉地址":
fragment = new WarehouseAddress();
break;
case "托運流程":
fragment = new TransProcess();
break;
case "常見問題":
fragment = new FAQ();
break;
case "聯絡我們":
fragment = new ContactUs();
break;
case "運費計算器":
fragment = new FeeCalculater();
break;
default:
fragment = new BlankTab();
}
controller.fragmentSwitch(getActivity(), fragment);
}
});
}
}
fragmentSwitch method
public void fragmentSwitch(Fragment fragment){
FragmentManager fragmentManager = slideMenuActivity.getSupportFragmentManager();
fragmentManager.beginTransaction()
//.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right)
.replace(android.R.id.tabcontent, fragment)
.commit();
fragmentManager.executePendingTransactions();
}

Finally, I found it. A commit() is missed in onTabChanged.
#Override
public void onTabChanged(String tabId) {
// TODO Auto-generated method stub
Log.d(TAB, tabId);
FragmentTransaction t = getSupportFragmentManager().beginTransaction();
Fragment fragment = null;
if (tabId.equals(this.NEWS_TAB)){
fragment = new News();
} else if (tabId.equals(this.SHARE_TAB)){
fragment = new GoodsShare();
} else if (tabId.equals(this.CAMERA_TAB)){
fragment = new Camera();
} else if (tabId.equals(this.STATUS_TAB)){
fragment = new LogisticStatus();
} else if (tabId.equals(this.OTHER_TAB)){
fragment = new Others();
}
if (fragment != null){
t.replace(android.R.id.tabcontent, fragment).commit(); //missing commit() here
} else {
Log.e(TAB, "fragment creation error");
}
}