you call getActivity(). setTitle(“Title”) , but in this case you need to attach your Toolbar to the ActionBar by calling the setSupportActionBar() in your activity. You can have a public instance of your Toolbar and access that instance from the fragment.
To do this, call setHasOptionsMenu(true) in the onCreate() method of the fragment. The Android framework calls in this case the onCreateOptionsMenu() method in the fragment class. Here the fragment can adds menu items to the toolbar.
You can create the buttons on action bar whatever the fragment you want, instead of doing the visibility stuff(show/hide). Add the following in the fragment whatever u need the menu item. Handling onclick events is as usual.
Can you explain when to use a fragment compared to an activity?
A fragment has its own layout and its own behavior with its own lifecycle callbacks. You can add or remove fragments in an activity while the activity is running. You can combine multiple fragments in a single activity to build a multi-pane UI. A fragment can be used in multiple activities.
Android Toolbar for AppCompatActivity
- Step 1: Check Gradle dependencies. …
- Step 2: Modify your layout.xml file and add a new style. …
- Step 3: Add a menu for the toolbar. …
- Step 4: Add toolbar to the activity. …
- Step 5: Inflate (Add) the menu to the toolbar. …
- 4 Ways To Communicate the Visibility of System Status in UI.
3 февр. 2016 г.
Toolbar was introduced in Android Lollipop, API 21 release and is the spiritual successor of the ActionBar. It’s a ViewGroup that can be placed anywhere in your XML layouts. Toolbar’s appearance and behavior can be more easily customized than the ActionBar. Toolbar works well with apps targeted to API 21 and above.
What is Setsupportactionbar?
Even in this simple form, the app bar provides useful information to the users, and helps to give Android apps a consistent look and feel. Figure 1. An app bar with the app title and overflow menu. Beginning with Android 3.0 (API level 11), all activities that use the default theme have an ActionBar as an app bar.
Adding Icons and Menu Items to an Android Toolbar
- When you get the dialogue box up, select menu from the Resources type dropdown:
- The Directory name box at the top will then change to menu:
- Click OK to create a menu folder inside of your res directory:
- Now right click your new menu folder.
androidx.appcompat.widget.Toolbar. A standard toolbar for use within application content. A Toolbar is a generalization of action bars for use within application layouts.
So to share a string between fragments you can declare a static String in Activity. Access that string from Fragment A to set the value and Get the string value in fragment B. 2. Both fragments are hosted by different Activities- Then you can use putExtra to pass a string from Fragment A of Activity A to Activity B.
The best way to hide all items in a menu with just one command is to use “group” on your menu xml. Just add all menu items that will be in your overflow menu inside the same group. Then, on your activity (preferable at onCreateOptionsMenu), use command setGroupVisible to set all menu items visibility to false or true.
Which method is called once the fragment gets visible?
Which method is called once the fragment gets visible? Explanation: onStart()The onStart() method is called once the fragment gets visible.
Why do we use fragments?
Passing information between app screens
Historically each screen in an Android app was implemented as a separate Activity. … By storing the information of interest within the Activity, the Fragment for each screen can simply access the object reference through the Activity.
How do I go back to fragment from activity?
When you call an activity from other activity’s fragment, then the previous activity’s instance state that is the calling activity which was having fragment’s instance state will be saved in stack…so all u need to do is finish the called activity and u will have the fragment from which you called your second activity …