Develop Reference

How to change text content in bottomNavigationView dynamically

I've got bottomNavigationView which is already created and attach to activity. Currently I'm trying to find out how to change text in one of navigation items which are inflated from res-menu dynamically.
I've tried to look into existing threads and none of that help me (I've already tried to pick menu from onCreateOptionsMenu and change it with setTitle option later but that wouldn't change text in the activity)
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
this.menu = menu;
return true;
}
//later update on button click (this action is performed)
menu.findItem(R.id.secondItem).setTitle("New Text");
I've expected to change text to "New Text" but it's still same as before

Okay after a while of trying I've finally figured out how to do that. Instead of taking menu during onCreateOptionsMenu I've pick menu directly from bottomNavigationView when I click on the button
//your code to invoke this action
Menu menu = bottomNavigationView.getMenu();
menu.getItem(2).setTitle("New Text");

try this method inside your activity/fragment:
public void setNavigationTitle(String title) {
MenuItem menuItem = bottomNavigationView.getMenu().findItem(R.id.action_navigation_next);
menuItem.setTitle(title);
}

How to make "my account or settings " clickable?

Here is the screen shot of my sidebar navigation bar.
I want to make the items in the sidebar navigation Menu clickable so that I can move to another Activity how can I do this?

You have to treat these as Menu items.
When you set up the navigation bar from the layout XML you attach a menu.xml to it which contains menu items that are then displayed in the navigation bar.
Method 1:
Now from the activity where you have your navigation bar variable you need to get the menu from the navigation view object.
Menu menu = navigation_view.getMenu();
Then you can get individual menuItems from this menu object.
MenuItem myAccount = menu.getItem(0);
MenuItem settingsItem = menu.getItem(1);
MenuItem logoutItem = menu.getItem(2);
Now you can use each of this menuItem objects to set menu click listeners on them and then start the next activity from there. e.g.
myAccount.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem menuItem) {
Intent intent = new Intent(context, ToAcitivity.class);
startActivity(intent);
return true;
}
});
Similarly, you can use rest of the objects and make them clickable.
Method 2:
You can also use
navigation_view.setNavigationItemSelectedListener(new
NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()){
case 1:
break;
case 2:
}
return false;
}
});
Second one being more simpler to use

Add icon to fragment actionbar and get reference to it

I have no custom bar, I just set a delete icon to the actionbar, but now I need to set OnClickListener to this icon. how can I do that without custom bar is this possible. Also the icon not apears on the left side, can I set it on the rightside?
activity.getSupportActionBar().setIcon(R.drawable.ic_delete);
I use Navigation Drawer, when I use custom bar the toggle icon despairs.

Looks like you want to set the ActionBar's home button as your delete button. I would suggest not to do it as that is a bad design decision in my opinion. And moreover you also want to show the button on the right hand side which can be done in a much intuitive manner by using a menu.
Please have a look at the official documentaion for adding ActionBar actions here
Basically you need to add an XML menu resource and declare your actions like this:
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="#+id/action_delete"
android:icon="#drawable/ic_delete"
android:title="#string/action_delete"
app:showAsAction="always"/>
</menu>
Then in your Activity override the OnOptionsItemSelected method:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_delete:
// Do your stuff here
return true;
default:
return super.onOptionsItemSelected(item);
}
}

actionBar.setDisplayHomeAsUpEnabled(true);
Then you need to override activity method:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onIconClicked();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
To create an item in the right side, you need to create custom menu, actually, it is simple.
Here is example how to do this

How to get all menu items id Android

I can get all the items from the actionbar with getItem() but I need to compare their id's with a particular id. How can I do this?

You can get actionBar menu items id by calling pMenu.getItem();
You can use changing methods of these menu items by overriding the method:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action buttons
switch(item.getItemId()) {
case R.id.action_stats:
break;
}
}

Change button state (icon) of Action Bar

How i can dinamically change action button icon of Action Bar when i swipe fragments in ViewPager. Depending on fragment button must change state (icon).

You can set the correct icon in onPrepareOptionsMenu, and then invalidate your action bar with invalidateOptionsMenu (or ActivityCompat.invalidateOptionsMenu if you are using the support library) when you want the icon to update.
For example:
#Override
public boolean onPrepareOptionsMenu (Menu menu) {
MenuItem item = menu.findItem(R.id.my_menu_id);
item.setIcon(getMenuItemIconResId());
}
#Override
public void onPageSelected(int position) {
invalidateOptionsMenu();
}

I solved this problem:
1) I implement OnPageChangeLister
2) Invoke setIcon() in onPageScrollStateChanged()
3) MenuItem defined like global variable (field of class)