Toolbar

public class Toolbar
extends ViewGroup

A standard toolbar for use within application content.

A Toolbar is a generalization of action bars for use within application layouts. While an action bar is traditionally part of an Activity's opaque window decor controlled by the framework, a Toolbar may be placed at any arbitrary level of nesting within a view hierarchy. An application may choose to designate a Toolbar as the action bar for an Activity using the setSupportActionBar() method.

Toolbar supports a more focused feature set than ActionBar. From start to end, a toolbar may contain a combination of the following optional elements:

• A navigation button. This may be an Up arrow, navigation menu toggle, close, collapse, done or another glyph of the app's choosing. This button should always be used to access other navigational destinations within the container of the Toolbar and its signified content or otherwise leave the current context signified by the Toolbar. The navigation button is vertically aligned within the Toolbar's minimum height, if set.
• A branded logo image. This may extend to the height of the bar and can be arbitrarily wide.
• A title and subtitle. The title should be a signpost for the Toolbar's current position in the navigation hierarchy and the content contained there. The subtitle, if present should indicate any extended information about the current content. If an app uses a logo image it should strongly consider omitting a title and subtitle.
• One or more custom views. The application may add arbitrary child views to the Toolbar. They will appear at this position within the layout. If a child view's Toolbar.LayoutParams indicates a Gravity value of CENTER_HORIZONTAL the view will attempt to center within the available space remaining in the Toolbar after all other elements have been measured.
• An action menu. The menu of actions will pin to the end of the Toolbar offering a few frequent, important or typical actions along with an optional overflow menu for additional actions. Action buttons are vertically aligned within the Toolbar's minimum height, if set.

In modern Android UIs developers should lean more on a visually distinct color scheme for toolbars than on their application icon. The use of application icon plus title as a standard layout is discouraged on API 21 devices and newer.

Summary

Inherited constants
From class android.view.ViewGroup int CLIP_TO_PADDING_MASK int FOCUS_AFTER_DESCENDANTS int FOCUS_BEFORE_DESCENDANTS int FOCUS_BLOCK_DESCENDANTS int LAYOUT_MODE_CLIP_BOUNDS int LAYOUT_MODE_OPTICAL_BOUNDS int PERSISTENT_ALL_CACHES int PERSISTENT_ANIMATION_CACHE int PERSISTENT_NO_CACHE int PERSISTENT_SCROLLING_CACHE
From class android.view.View int ACCESSIBILITY_LIVE_REGION_ASSERTIVE int ACCESSIBILITY_LIVE_REGION_NONE int ACCESSIBILITY_LIVE_REGION_POLITE int AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS String AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE String AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY String AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH String AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR String AUTOFILL_HINT_CREDIT_CARD_NUMBER String AUTOFILL_HINT_CREDIT_CARD_SECURITY_CODE String AUTOFILL_HINT_EMAIL_ADDRESS String AUTOFILL_HINT_NAME String AUTOFILL_HINT_PASSWORD String AUTOFILL_HINT_PHONE String AUTOFILL_HINT_POSTAL_ADDRESS String AUTOFILL_HINT_POSTAL_CODE String AUTOFILL_HINT_USERNAME int AUTOFILL_TYPE_DATE int AUTOFILL_TYPE_LIST int AUTOFILL_TYPE_NONE int AUTOFILL_TYPE_TEXT int AUTOFILL_TYPE_TOGGLE int DRAG_FLAG_GLOBAL int DRAG_FLAG_GLOBAL_PERSISTABLE_URI_PERMISSION int DRAG_FLAG_GLOBAL_PREFIX_URI_PERMISSION int DRAG_FLAG_GLOBAL_URI_READ int DRAG_FLAG_GLOBAL_URI_WRITE int DRAG_FLAG_OPAQUE int DRAWING_CACHE_QUALITY_AUTO int DRAWING_CACHE_QUALITY_HIGH int DRAWING_CACHE_QUALITY_LOW int FIND_VIEWS_WITH_CONTENT_DESCRIPTION int FIND_VIEWS_WITH_TEXT int FOCUSABLE int FOCUSABLES_ALL int FOCUSABLES_TOUCH_MODE int FOCUSABLE_AUTO int FOCUS_BACKWARD int FOCUS_DOWN int FOCUS_FORWARD int FOCUS_LEFT int FOCUS_RIGHT int FOCUS_UP int GONE int HAPTIC_FEEDBACK_ENABLED int IMPORTANT_FOR_ACCESSIBILITY_AUTO int IMPORTANT_FOR_ACCESSIBILITY_NO int IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS int IMPORTANT_FOR_ACCESSIBILITY_YES int IMPORTANT_FOR_AUTOFILL_AUTO int IMPORTANT_FOR_AUTOFILL_NO int IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS int IMPORTANT_FOR_AUTOFILL_YES int IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS int INVISIBLE int KEEP_SCREEN_ON int LAYER_TYPE_HARDWARE int LAYER_TYPE_NONE int LAYER_TYPE_SOFTWARE int LAYOUT_DIRECTION_INHERIT int LAYOUT_DIRECTION_LOCALE int LAYOUT_DIRECTION_LTR int LAYOUT_DIRECTION_RTL int MEASURED_HEIGHT_STATE_SHIFT int MEASURED_SIZE_MASK int MEASURED_STATE_MASK int MEASURED_STATE_TOO_SMALL int NOT_FOCUSABLE int NO_ID int OVER_SCROLL_ALWAYS int OVER_SCROLL_IF_CONTENT_SCROLLS int OVER_SCROLL_NEVER int SCREEN_STATE_OFF int SCREEN_STATE_ON int SCROLLBARS_INSIDE_INSET int SCROLLBARS_INSIDE_OVERLAY int SCROLLBARS_OUTSIDE_INSET int SCROLLBARS_OUTSIDE_OVERLAY int SCROLLBAR_POSITION_DEFAULT int SCROLLBAR_POSITION_LEFT int SCROLLBAR_POSITION_RIGHT int SCROLL_AXIS_HORIZONTAL int SCROLL_AXIS_NONE int SCROLL_AXIS_VERTICAL int SCROLL_INDICATOR_BOTTOM int SCROLL_INDICATOR_END int SCROLL_INDICATOR_LEFT int SCROLL_INDICATOR_RIGHT int SCROLL_INDICATOR_START int SCROLL_INDICATOR_TOP int SOUND_EFFECTS_ENABLED int STATUS_BAR_HIDDEN int STATUS_BAR_VISIBLE int SYSTEM_UI_FLAG_FULLSCREEN int SYSTEM_UI_FLAG_HIDE_NAVIGATION int SYSTEM_UI_FLAG_IMMERSIVE int SYSTEM_UI_FLAG_IMMERSIVE_STICKY int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION int SYSTEM_UI_FLAG_LAYOUT_STABLE int SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR int SYSTEM_UI_FLAG_LIGHT_STATUS_BAR int SYSTEM_UI_FLAG_LOW_PROFILE int SYSTEM_UI_FLAG_VISIBLE int SYSTEM_UI_LAYOUT_FLAGS int TEXT_ALIGNMENT_CENTER