I am getting Problem in Navigation drawer if I am clicking any drawer item more than one time (Example 5 times) then on back press I am getting 5 time same fragment.
Suppose first I had click on Fragment one then 5 times on fragment two then after on Back Handling or on Back Pressed first 5 times second fragment has been called and the the fragment one.
I want that if the same no. of fragment I have clicked multiple times the no need to push it on stack.
How to handle this?
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,HomeListFragment.MyListFragmentListener {
private Stack<Fragment> fragmentStack;
private FragmentManager fragmentManager;
private HomeListFragment homeListFragment;
private ResultListFragment resultListFragment;
#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.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
fragmentStack = new Stack<Fragment>();
homeListFragment = new HomeListFragment();
homeListFragment.registerForListener(this);
fragmentManager = getSupportFragmentManager();
FragmentTransaction ft = fragmentManager.beginTransaction();
ft.add(R.id.container, homeListFragment);
fragmentStack.push(homeListFragment);
ft.commit();
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
if (fragmentStack.size() >1) {
FragmentTransaction ft = fragmentManager.beginTransaction();
fragmentStack.lastElement().onPause();
ft.remove(fragmentStack.pop());
fragmentStack.lastElement().onResume();
ft.show(fragmentStack.lastElement());
ft.commit();
} 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);
}
#Override
public void onItemClickedListener(String valueClicked) {
Toast.makeText(this, valueClicked, Toast.LENGTH_LONG).show();
FragmentTransaction ft = fragmentManager.beginTransaction();
resultListFragment = new ResultListFragment();
ft.add(R.id.container, resultListFragment);
fragmentStack.lastElement().onPause();
ft.hide(fragmentStack.lastElement());
fragmentStack.push(resultListFragment);
ft.commit();
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
FragmentTransaction ft = fragmentManager.beginTransaction();
One one = new One();
ft.replace(R.id.container, one,"One");
fragmentStack.lastElement().onPause();
ft.hide(fragmentStack.lastElement());
fragmentStack.push(one);
ft.commit();
} else if (id == R.id.nav_gallery) {
FragmentTransaction ft = fragmentManager.beginTransaction();
Two two = new Two();
ft.replace(R.id.container, two,"Two");
fragmentStack.lastElement().onPause();
ft.hide(fragmentStack.lastElement());
fragmentStack.push(two);
ft.commit();
} else if (id == R.id.nav_slideshow) {
FragmentTransaction ft = fragmentManager.beginTransaction();
Three three = new Three();
ft.replace(R.id.container, three,"Three");
fragmentStack.lastElement().onPause();
ft.hide(fragmentStack.lastElement());
fragmentStack.push(three);
ft.commit();
} else if (id == R.id.nav_manage) {
FragmentTransaction ft = fragmentManager.beginTransaction();
Four four = new Four();
ft.replace(R.id.container, four,"Four");
fragmentStack.lastElement().onPause();
ft.hide(fragmentStack.lastElement());
fragmentStack.push(four);
ft.commit();
} 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;
}
Please Help
//You are using backstack to hold the previous fragments remove all the fragment stacks
One one = new One();
ft.replace(R.id.container, one,"One");
ft.commit();
or you may use below code in backPress method
getSupportFragmentManager().popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
You can simply check the current fragment instance is exist or not by tag. Check the fragment is exist or not and then do your logic by that.
Fragment fragment = getFragmentManager().findFragmentByTag("yourstringtag");
if (fragment instanceof yourFragment) {
// No need to commit new one
} else {
// Commit new one
}
Another simple method to solve this issue by using a currentFragment instance. Please consider this as an example logic, I didn't checked it.
private Fragment mFragment;
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
if (!(mFragment instanceof One)) {
FragmentTransaction ft = fragmentManager.beginTransaction();
One one = new One();
ft.replace(R.id.container, one, "One");
fragmentStack.lastElement().onPause();
ft.hide(fragmentStack.lastElement());
fragmentStack.push(one);
mFragment = one;
ft.commit();
}
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
Related
How do I remove the color of the selected section of the image within this function, thank you very much for the help, first code is the onnavigationitemselected, and the second the function which i want to remove the color of the selected
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_mapa)
{
// Handle the home action
MapFragment mapFragment = new MapFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, mapFragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_anuncios)
{
AnunciosFragment anunciosFragment = new AnunciosFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, anunciosFragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_adopciones)
{
AdopcionesFragment adopcionesFragment = new AdopcionesFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, adopcionesFragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_protectoras)
{
ProtectorasFragment protectorasFragment = new ProtectorasFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, protectorasFragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_ajustes)
{
Toast.makeText(this, "Ajustes clicked", Toast.LENGTH_SHORT).show();
} else if (id == R.id.nav_contacto)
{
Toast.makeText(this, "Contacto Clicked", Toast.LENGTH_SHORT).show();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
Perfil function:
public void Perfil(View view)
{
HomeFragment homeFragment = new HomeFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, homeFragment);
fragmentTransaction.commit();
//per tancar NAV al seleccionar
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
}
Image which i want to eliminate the selection :
you can do it like this:
public boolean onNavigationItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_camera:
break;
case R.id.nav_gallery:
break;
}
mDrawerLayout.closeDrawer(GravityCompat.START);
return false;
}
return false means unchecked state.
or else you can do it like :
drawer.getMenu().findItem(R.id.nav_camera).setChecked(false);
you need to se checked false unselect menu item
navigationView.getMenu().getItem(3).setChecked(false);
getItem(3) means you need to pass index of menu item
I want to implement onBackPress to my fragment but i don't know how. When i go to another fragment (in this case, my fragment is the one from my ActivityHome and i'm using standard NavigationDrawer from android stuudio).
Here is my code for ActivityHome
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 = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
FragmentHome fragment = new FragmentHome();
fragmentTransaction.add(R.id.containerID, fragment);
fragmentTransaction.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.activity_home, 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_logout) {
Toast.makeText(getApplicationContext(),
"Akun anda telah dikeluarkan!", Toast.LENGTH_LONG).show();
Intent logout = new Intent(ActivityHome.this, ActivityMain.class);
startActivity(logout);
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
int id = item.getItemId();
if(id == R.id.nav_home){
ActivityHome.this.getSupportFragmentManager().beginTransaction().replace(R.id.containerID, FragmentHome.newInstance()).commit();
}else if (id == R.id.nav_profile){
ActivityHome.this.getSupportFragmentManager().beginTransaction().replace(R.id.containerID, Profile.newInstance()).commit();
}
else if (id == R.id.nav_history){
ActivityHome.this.getSupportFragmentManager().beginTransaction().replace(R.id.containerID, History.newInstance()).commit();
}
else if (id == R.id.nav_about_us){
ActivityHome.this.getSupportFragmentManager().beginTransaction().replace(R.id.containerID, AboutUs.newInstance()).commit();
}
else if (id == R.id.nav_ganti_kata_sandi){
ActivityHome.this.getSupportFragmentManager().beginTransaction().replace(R.id.containerID, GantiKataSandi.newInstance()).commit();
}
else if (id == R.id.nav_share){
ActivityHome.this.getSupportFragmentManager().beginTransaction().replace(R.id.containerID, Share.newInstance()).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
I hope u guys can help me with my problem.
I have webview in fragment, I used this code to detect backpress code in mainactivity OnbackPressed():
Fragment webview = getSupportFragmentManager().findFragmentByTag("BLOG");
if (webview instanceof BlogFragment) {
boolean goback = ((BlogFragment) webview).canGoBack();
if (!goback) {
} else {
((BlogFragment) webview).goBack();
}
}
Make sure you start fragment like:
getSupportFragmentManager()
.beginTransaction()
.addToBackStack(null)
.replace(R.id.frame_content, new BlogFragment(), "BLOG")
.commit();
To open fragment from activity.
Fragment fragment = Fragment.newInstance();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.setCustomAnimations(R.anim.fragment_slide_left_enter,
R.anim.fragment_slide_left_exit, R.anim.fragment_slide_right_enter,
R.anim.fragment_slide_right_exit);
addFragmentToActivity(fragmentTransaction, Fragment, R.id
.content_frame);
public void addFragmentToActivity(#NonNull FragmentTransaction transaction,
#NonNull Fragment fragment, int frameId) {
transaction.addToBackStack(fragment.getClass().getName());
transaction.add(frameId, fragment, fragment.getClass().getName());
transaction.commit();
}
That's how I add fragment from HomeActivity and For back Call override method OnBackPressed in HomeActivity.
#Override
public void onBackPressed() {
if (getSupportFragmentManager().getBackStackEntryCount() > 1) {
getSupportFragmentManager().popBackStackImmediate();
}
You can get event when back button pressed from any fragment in Activity's onBackPressed() method.
Suppose you've pressed back from HomeFragment then you can get onBackPressed in Activity like following :
#Override
public void onBackPressed() {
HomeFragment fragment = (Fragment)findFragmentById(// fragment id);
if(fragment!=null && fragment.isVisible()){
// Here you can code for Home Fragment's onBackPress()
}
super.onBackPressed();
}
Thank you for spending time on my qeustion. In my app I am using android studio navigation drawer template.
But the problem is that, when I rotate the phone, the previous fragment's layout is shown above the current fragment.
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);
Fragment fragment = null;
Class fragmentClass = null;
/* if (savedInstanceState == null){
try{
fragment = (Fragment) fragmentClass.newInstance();
}catch (Exception e){
e.printStackTrace();
}
}*/
fragment = new Login();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.fragment, fragment);
fragmentTransaction.commit();
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() {
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();
Fragment fragment =null ;
Class fragmentClas = null;
if (id == R.id.nav_camera) {
// Handle the camera action
fragment = new Attendance();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment, fragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_gallery) {
fragment = new AddStudent();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment, fragment);
fragmentTransaction.commit();
} 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) {
}
/* FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();*/
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
When you rotate the device, the activity saves its current state and keeps the current fragment then it's destroyed and recreated i.e. onCreate() is called again. You had one fragment before it's destroyed and now it added another in the new call to onCreate() that's why you have 2 fragments. To fix this you should check first if the savedInstanceState parameter in onCreate() is null i.e. it's the first creation of activity not just being restarted due to rotation change or anything, then decide to add the fragment or not instead of adding to whenever the activity calls onCreate()
if(savedInstanceState == null) {
// Add the fragment because it's normal creation
fragment = new Login();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.fragment, fragment);
fragmentTransaction.commit();
}
I am selecting a default fragment in NavigationView when my activity starts up,
it works alright but the problem with it is that when I press the back button, I see a blank view.
My Activity
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private final String TAG = "MainActivity";
NavigationView navigationView;
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
String about_blog = "http://example.com/page/json/urls/p-about";
String contri = "http://example.com/page/json/urls/contribute";
String privy = "http://example.com/page/json/urls/privacy-rules";
String contact = "http://example.com/page/json/urls/contact_us";
String advert = "http://example.com/page/json/urls/advertise-here";
String spons = "http://example.com/page/json/urls/sponsor-us";
Fragment fragment = null;
if (id == R.id.menu_home) {
fragment = new PostFragment();
}
if (id == R.id.about_blog) {
fragment = new PageFragment();
} else if (id == R.id.nav_contri) {
fragment = new PageFragment();
} else if (id == R.id.nav_contact) {
fragment = new PageFragment();
} else if (id == R.id.nav_privy) {
fragment = new PageFragment();
} else if (id == R.id.nav_advert) {
fragment = new PageFragment();
} else if (id == R.id.spons) {
fragment = new PageFragment();
} else if (id == R.id.app_about) {
//fragment = new abtFragment();
} else if (id == R.id.settings) {
//fragment = new SettingFragment;
}
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, fragment);
ft.addToBackStack(null);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ft.commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG, "Device rotated and onCreate called");
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);
navigationView.setCheckedItem(R.id.menu_home);
navigationView.getMenu().performIdentifierAction(R.id.menu_home, 0);
}
To expatiate, when I launch the app, PostFragment is launched by default. When I click the back key, instead of the app closing, I meet a blank page.
Please, what am I doing wrong here and how do I correct it?
I have found the solution here. Just paste this
FragmentManager fm = getSupportFragmentManager();
fm.addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
#Override public void onBackStackChanged() { if (getSupportFragmentManager().getBackStackEntryCount() == 0) finish(); } });
In the hosting activity's onCreate.
What this does is to finish the activity if the current fragment is the last in the back stack.
I created an Navigation Drawer Activity in Android Studio 1.4. My Main Activity is already setted up and now I want to switch to another Activity via the Navigation Drawer. The second Activity (AddDataActivity) should collect some User Unputs to create string which should be displayed in my Main Activities ListView.
My problem is, that I dont know how to open the AddDataActivity without "loosing" my navigation Drawer.
Intent AddData = new Intent(MainActivity.this, AddDataActivity.class);
MainActivity.this.startActivity(AddData);
Do I have to copy the whole Drawer Code for each Activity? Or would it be better to use Fragments?
I use Fragments now I avoid this Situation.
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
Fragment fragment;
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
fragment = new ListViewFragment();
int id = item.getItemId();
if (id == R.id.nav_listview) {
fragment= new ListViewFragment();
} else if (id == R.id.nav_add_data) {
fragment= new AddDataFragment();
} else if (id == R.id.nav_settings) {
fragment= new SettingsFragment();
} else if (id == R.id.nav_rooms) {
fragment= new SavedRoomsFragment();
} else if (id == R.id.nav_legal_information) {
fragment = new LegalInformationFragment();
}
ft.replace(R.id.container, fragment);
ft.addToBackStack(null);
ft.commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}