If AlertDialog.Builder is not recognized as you enter it, click the red light bulb icon, and choose the support library version (android.support.v7.app.AlertDialog) for importing into your Activity. AppBarLayout is like a vertical LinearLayout. it will always appear on the toolbar; withText means that the
The activity_main.xml layout also uses an include layout statement to include the entire layout defined in content_main.xml. This separation of layout definitions makes it easier to change the layout's content apart from the layout's toolbar definition and coordinator layout. In the onCreate() method, register the TextView: Android Studio project: ContextMenuScrollingText. Your properties area should look like this, so far: You'll probably want an icon to appear for your toolbar items. When opened, the first visible portion is the icon menu, which holds up to six menu items. This is for items that won't
For this exercise you are using the v7 appcompat support library's Toolbar as an app bar, which works on the widest range of devices and also gives you room to customize your app bar later on as your app develops. The free images are pixel perfect to fit your design and available in both png and vector. The following values for the attribute specify whether or not the action should appear in the app bar as an icon: Follow these steps to show some of the menu items as icons: How many action buttons will fit in the app bar? Add two more menu items the same way with the following attributes: Tap the overflow icon in the app bar to see the options menu. The app then displays a Toast message showing the menu option chosen, as shown in the right side of the figure. Use a dialog to request a user's choice, such as an alert that requires users to tap. drawable folder as a Vector asset. Option Menu with Icon. This is a best practice for separating your content (which may need to be translated) from the format of your layout. In this task you open the DroidCafeInput project from the previous practical and add menu items to the options menu in the app bar at the top of the screen. You should now have a layout similar to the following: In this step, you add a Fragment for the date picker. Tip: To provide a familiar and consistent user experience, use the Menu APIs to present user actions and other options in your activities. If you select the three dot icon the Settings menu item appears: If you take a look at the menu_main.xml file you can see the definition of this menu: