/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.app;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewDebug;
import android.view.ViewGroup;
import android.view.ViewGroup.MarginLayoutParams;
import android.view.Window;
import android.widget.SpinnerAdapter;
/**
* A window feature at the top of the activity that may display the activity title, navigation
* modes, and other interactive items.
* <p>Beginning with Android 3.0 (API level 11), the action bar appears at the top of an
* activity's window when the activity uses the system's {@link
* android.R.style#Theme_Holo Holo} theme (or one of its descendant themes), which is the default.
* You may otherwise add the action bar by calling {@link
* android.view.Window#requestFeature requestFeature(FEATURE_ACTION_BAR)} or by declaring it in a
* custom theme with the {@link android.R.styleable#Theme_windowActionBar windowActionBar} property.
* <p>By default, the action bar shows the application icon on
* the left, followed by the activity title. If your activity has an options menu, you can make
* select items accessible directly from the action bar as "action items". You can also
* modify various characteristics of the action bar or remove it completely.</p>
* <p>From your activity, you can retrieve an instance of {@link ActionBar} by calling {@link
* android.app.Activity#getActionBar getActionBar()}.</p>
* <p>In some cases, the action bar may be overlayed by another bar that enables contextual actions,
* using an {@link android.view.ActionMode}. For example, when the user selects one or more items in
* your activity, you can enable an action mode that offers actions specific to the selected
* items, with a UI that temporarily replaces the action bar. Although the UI may occupy the
* same space, the {@link android.view.ActionMode} APIs are distinct and independent from those for
* {@link ActionBar}.
* <div class="special reference">
* <h3>Developer Guides</h3>
* <p>For information about how to use the action bar, including how to add action items, navigation
* modes and more, read the <a href="{@docRoot}guide/topics/ui/actionbar.html">Action
* Bar</a> developer guide.</p>
* </div>
*/
public abstract class ActionBar {
/**
* Standard navigation mode. Consists of either a logo or icon
* and title text with an optional subtitle. Clicking any of these elements
* will dispatch onOptionsItemSelected to the host Activity with
* a MenuItem with item ID android.R.id.home.
*/
public static final int NAVIGATION_MODE_STANDARD = 0;
/**
* List navigation mode. Instead of static title text this mode
* presents a list menu for navigation within the activity.
* e.g. this might be presented to the user as a dropdown list.
*/
public static final int NAVIGATION_MODE_LIST = 1;
/**
* Tab navigation mode. Instead of static title text this mode
* presents a series of tabs for navigation within the activity.
*/
public static final int NAVIGATION_MODE_TABS = 2;
/**
* Use logo instead of icon if available. This flag will cause appropriate
* navigation modes to use a wider logo in place of the standard icon.
*
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public static final int DISPLAY_USE_LOGO = 0x1;
/**
* Show 'home' elements in this action bar, leaving more space for other
* navigation elements. This includes logo and icon.
*
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public static final int DISPLAY_SHOW_HOME = 0x2;
/**
* Display the 'home' element such that it appears as an 'up' affordance.
* e.g. show an arrow to the left indicating the action that will be taken.
*
* Set this flag if selecting the 'home' button in the action bar to return
* up by a single level in your UI rather than back to the top level or front page.
*
* <p>Setting this option will implicitly enable interaction with the home/up
* button. See {@link #setHomeButtonEnabled(boolean)}.
*
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public static final int DISPLAY_HOME_AS_UP = 0x4;
/**
* Show the activity title and subtitle, if present.
*
* @see #setTitle(CharSequence)
* @see #setTitle(int)
* @see #setSubtitle(CharSequence)
* @see #setSubtitle(int)
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public static final int DISPLAY_SHOW_TITLE = 0x8;
/**
* Show the custom view if one has been set.
* @see #setCustomView(View)
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public static final int DISPLAY_SHOW_CUSTOM = 0x10;
/**
* Set the action bar into custom navigation mode, supplying a view
* for custom navigation.
*
* Custom navigation views appear between the application icon and
* any action buttons and may use any space available there. Common
* use cases for custom navigation views might include an auto-suggesting
* address bar for a browser or other navigation mechanisms that do not
* translate well to provided navigation modes.
*
* @param view Custom navigation view to place in the ActionBar.
*/
public abstract void setCustomView(View view);
/**
* Set the action bar into custom navigation mode, supplying a view
* for custom navigation.
*
* <p>Custom navigation views appear between the application icon and
* any action buttons and may use any space available there. Common
* use cases for custom navigation views might include an auto-suggesting
* address bar for a browser or other navigation mechanisms that do not
* translate well to provided navigation modes.</p>
*
* <p>The display option {@link #DISPLAY_SHOW_CUSTOM} must be set for
* the custom view to be displayed.</p>
*
* @param view Custom navigation view to place in the ActionBar.
* @param layoutParams How this custom view should layout in the bar.
*
* @see #setDisplayOptions(int, int)
*/
public abstract void setCustomView(View view, LayoutParams layoutParams);
/**
* Set the action bar into custom navigation mode, supplying a view
* for custom navigation.
*
* <p>Custom navigation views appear between the application icon and
* any action buttons and may use any space available there. Common
* use cases for custom navigation views might include an auto-suggesting
* address bar for a browser or other navigation mechanisms that do not
* translate well to provided navigation modes.</p>
*
* <p>The display option {@link #DISPLAY_SHOW_CUSTOM} must be set for
* the custom view to be displayed.</p>
*
* @param resId Resource ID of a layout to inflate into the ActionBar.
*
* @see #setDisplayOptions(int, int)
*/
public abstract void setCustomView(int resId);
/**
* Set the icon to display in the 'home' section of the action bar.
* The action bar will use an icon specified by its style or the
* activity icon by default.
*
* Whether the home section shows an icon or logo is controlled
* by the display option {@link #DISPLAY_USE_LOGO}.
*
* @param resId Resource ID of a drawable to show as an icon.
*
* @see #setDisplayUseLogoEnabled(boolean)
* @see #setDisplayShowHomeEnabled(boolean)
*/
public abstract void setIcon(int resId);
/**
* Set the icon to display in the 'home' section of the action bar.
* The action bar will use an icon specified by its style or the
* activity icon by default.
*
* Whether the home section shows an icon or logo is controlled
* by the display option {@link #DISPLAY_USE_LOGO}.
*
* @param icon Drawable to show as an icon.
*
* @see #setDisplayUseLogoEnabled(boolean)
* @see #setDisplayShowHomeEnabled(boolean)
*/
public abstract void setIcon(Drawable icon);
/**
* Set the logo to display in the 'home' section of the action bar.
* The action bar will use a logo specified by its style or the
* activity logo by default.
*
* Whether the home section shows an icon or logo is controlled
* by the display option {@link #DISPLAY_USE_LOGO}.
*
* @param resId Resource ID of a drawable to show as a logo.
*
* @see #setDisplayUseLogoEnabled(boolean)
* @see #setDisplayShowHomeEnabled(boolean)
*/
public abstract void setLogo(int resId);
/**
* Set the logo to display in the 'home' section of the action bar.
* The action bar will use a logo specified by its style or the
* activity logo by default.
*
* Whether the home section shows an icon or logo is controlled
* by the display option {@link #DISPLAY_USE_LOGO}.
*
* @param logo Drawable to show as a logo.
*
* @see #setDisplayUseLogoEnabled(boolean)
* @see #setDisplayShowHomeEnabled(boolean)
*/
public abstract void setLogo(Drawable logo);
/**
* Set the adapter and navigation callback for list navigation mode.
*
* The supplied adapter will provide views for the expanded list as well as
* the currently selected item. (These may be displayed differently.)
*
* The supplied OnNavigationListener will alert the application when the user
* changes the current list selection.
*
* @param adapter An adapter that will provide views both to display
* the current navigation selection and populate views
* within the dropdown navigation menu.
* @param callback An OnNavigationListener that will receive events when the user
* selects a navigation item.
*/
public abstract void setListNavigationCallbacks(SpinnerAdapter adapter,
OnNavigationListener callback);
/**
* Set the selected navigation item in list or tabbed navigation modes.
*
* @param position Position of the item to select.
*/
public abstract void setSelectedNavigationItem(int position);
/**
* Get the position of the selected navigation item in list or tabbed navigation modes.
*
* @return Position of the selected item.
*/
public abstract int getSelectedNavigationIndex();
/**
* Get the number of navigation items present in the current navigation mode.
*
* @return Number of navigation items.
*/
public abstract int getNavigationItemCount();
/**
* Set the action bar's title. This will only be displayed if
* {@link #DISPLAY_SHOW_TITLE} is set.
*
* @param title Title to set
*
* @see #setTitle(int)
* @see #setDisplayOptions(int, int)
*/
public abstract void setTitle(CharSequence title);
/**
* Set the action bar's title. This will only be displayed if
* {@link #DISPLAY_SHOW_TITLE} is set.
*
* @param resId Resource ID of title string to set
*
* @see #setTitle(CharSequence)
* @see #setDisplayOptions(int, int)
*/
public abstract void setTitle(int resId);
/**
* Set the action bar's subtitle. This will only be displayed if
* {@link #DISPLAY_SHOW_TITLE} is set. Set to null to disable the
* subtitle entirely.
*
* @param subtitle Subtitle to set
*
* @see #setSubtitle(int)
* @see #setDisplayOptions(int, int)
*/
public abstract void setSubtitle(CharSequence subtitle);
/**
* Set the action bar's subtitle. This will only be displayed if
* {@link #DISPLAY_SHOW_TITLE} is set.
*
* @param resId Resource ID of subtitle string to set
*
* @see #setSubtitle(CharSequence)
* @see #setDisplayOptions(int, int)
*/
public abstract void setSubtitle(int resId);
/**
* Set display options. This changes all display option bits at once. To change
* a limited subset of display options, see {@link #setDisplayOptions(int, int)}.
*
* @param options A combination of the bits defined by the DISPLAY_ constants
* defined in ActionBar.
*/
public abstract void setDisplayOptions(int options);
/**
* Set selected display options. Only the options specified by mask will be changed.
* To change all display option bits at once, see {@link #setDisplayOptions(int)}.
*
* <p>Example: setDisplayOptions(0, DISPLAY_SHOW_HOME) will disable the
* {@link #DISPLAY_SHOW_HOME} option.
* setDisplayOptions(DISPLAY_SHOW_HOME, DISPLAY_SHOW_HOME | DISPLAY_USE_LOGO)
* will enable {@link #DISPLAY_SHOW_HOME} and disable {@link #DISPLAY_USE_LOGO}.
*
* @param options A combination of the bits defined by the DISPLAY_ constants
* defined in ActionBar.
* @param mask A bit mask declaring which display options should be changed.
*/
public abstract void setDisplayOptions(int options, int mask);
/**
* Set whether to display the activity logo rather than the activity icon.
* A logo is often a wider, more detailed image.
*
* <p>To set several display options at once, see the setDisplayOptions methods.
*
* @param useLogo true to use the activity logo, false to use the activity icon.
*
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public abstract void setDisplayUseLogoEnabled(boolean useLogo);
/**
* Set whether to include the application home affordance in the action bar.
* Home is presented as either an activity icon or logo.
*
* <p>To set several display options at once, see the setDisplayOptions methods.
*
* @param showHome true to show home, false otherwise.
*
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public abstract void setDisplayShowHomeEnabled(boolean showHome);
/**
* Set whether home should be displayed as an "up" affordance.
* Set this to true if selecting "home" returns up by a single level in your UI
* rather than back to the top level or front page.
*
* <p>To set several display options at once, see the setDisplayOptions methods.
*
* @param showHomeAsUp true to show the user that selecting home will return one
* level up rather than to the top level of the app.
*
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public abstract void setDisplayHomeAsUpEnabled(boolean showHomeAsUp);
/**
* Set whether an activity title/subtitle should be displayed.
*
* <p>To set several display options at once, see the setDisplayOptions methods.
*
* @param showTitle true to display a title/subtitle if present.
*
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public abstract void setDisplayShowTitleEnabled(boolean showTitle);
/**
* Set whether a custom view should be displayed, if set.
*
* <p>To set several display options at once, see the setDisplayOptions methods.
*
* @param showCustom true if the currently set custom view should be displayed, false otherwise.
*
* @see #setDisplayOptions(int)
* @see #setDisplayOptions(int, int)
*/
public abstract void setDisplayShowCustomEnabled(boolean showCustom);
/**
* Set the ActionBar's background. This will be used for the primary
* action bar.
*
* @param d Background drawable
* @see #setStackedBackgroundDrawable(Drawable)
* @see #setSplitBackgroundDrawable(Drawable)
*/
public abstract void setBackgroundDrawable(Drawable d);
/**
* Set the ActionBar's stacked background. This will appear
* in the second row/stacked bar on some devices and configurations.
*
* @param d Background drawable for the stacked row
*/
public void setStackedBackgroundDrawable(Drawable d) { }
/**
* Set the ActionBar's split background. This will appear in
* the split action bar containing menu-provided action buttons
* on some devices and configurations.
* <p>You can enable split action bar with {@link android.R.attr#uiOptions}
*
* @param d Background drawable for the split bar
*/
public void setSplitBackgroundDrawable(Drawable d) { }
/**
* @return The current custom view.
*/
public abstract View getCustomView();
/**
* Returns the current ActionBar title in standard mode.
* Returns null if {@link #getNavigationMode()} would not return
* {@link #NAVIGATION_MODE_STANDARD}.
*
* @return The current ActionBar title or null.
*/
public abstract CharSequence getTitle();
/**
* Returns the current ActionBar subtitle in standard mode.
* Returns null if {@link #getNavigationMode()} would not return
* {@link #NAVIGATION_MODE_STANDARD}.
*
* @return The current ActionBar subtitle or null.
*/
public abstract CharSequence getSubtitle();
/**
* Returns the current navigation mode. The result will be one of:
* <ul>
* <li>{@link #NAVIGATION_MODE_STANDARD}</li>
* <li>{@link #NAVIGATION_MODE_LIST}</li>
* <li>{@link #NAVIGATION_MODE_TABS}</li>
* </ul>
*
* @return The current navigation mode.
*/
public abstract int getNavigationMode();
/**
* Set the current navigation mode.
*
* @param mode The new mode to set.
* @see #NAVIGATION_MODE_STANDARD
* @see #NAVIGATION_MODE_LIST
* @see #NAVIGATION_MODE_TABS
*/
public abstract void setNavigationMode(int mode);
/**
* @return The current set of display options.
*/
public abstract int getDisplayOptions();
/**
* Create and return a new {@link Tab}.
* This tab will not be included in the action bar until it is added.
*
* <p>Very often tabs will be used to switch between {@link Fragment}
* objects. Here is a typical implementation of such tabs:</p>
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentTabs.java
* complete}
*
* @return A new Tab
*
* @see #addTab(Tab)
*/
public abstract Tab newTab();
/**
* Add a tab for use in tabbed navigation mode. The tab will be added at the end of the list.
* If this is the first tab to be added it will become the selected tab.
*
* @param tab Tab to add
*/
public abstract void addTab(Tab tab);
/**
* Add a tab for use in tabbed navigation mode. The tab will be added at the end of the list.
*
* @param tab Tab to add
* @param setSelected True if the added tab should become the selected tab.
*/
public abstract void addTab(Tab tab, boolean setSelected);
/**
* Add a tab for use in tabbed navigation mode. The tab will be inserted at
* <code>position</code>. If this is the first tab to be added it will become
* the selected tab.
*
* @param tab The tab to add
* @param position The new position of the tab
*/
public abstract void addTab(Tab tab, int position);
/**
* Add a tab for use in tabbed navigation mode. The tab will be insterted at
* <code>position</code>.
*
* @param tab The tab to add
* @param position The new position of the tab
* @param setSelected True if the added tab should become the selected tab.
*/
public abstract void addTab(Tab tab, int position, boolean setSelected);
/**
* Remove a tab from the action bar. If the removed tab was selected it will be deselected
* and another tab will be selected if present.
*
* @param tab The tab to remove
*/
public abstract void removeTab(Tab tab);
/**
* Remove a tab from the action bar. If the removed tab was selected it will be deselected
* and another tab will be selected if present.
*
* @param position Position of the tab to remove
*/
public abstract void removeTabAt(int position);
/**
* Remove all tabs from the action bar and deselect the current tab.
*/
public abstract void removeAllTabs();
/**
* Select the specified tab. If it is not a child of this action bar it will be added.
*
* <p>Note: If you want to select by index, use {@link #setSelectedNavigationItem(int)}.</p>
*
* @param tab Tab to select
*/
public abstract void selectTab(Tab tab);
/**
* Returns the currently selected tab if in tabbed navigation mode and there is at least
* one tab present.
*
* @return The currently selected tab or null
*/
public abstract Tab getSelectedTab();
/**
* Returns the tab at the specified index.
*
* @param index Index value in the range 0-get
* @return
*/
public abstract Tab getTabAt(int index);
/**
* Returns the number of tabs currently registered with the action bar.
* @return Tab count
*/
public abstract int getTabCount();
/**
* Retrieve the current height of the ActionBar.
*
* @return The ActionBar's height
*/
public abstract int getHeight();
/**
* Show the ActionBar if it is not currently showing.
* If the window hosting the ActionBar does not have the feature
* {@link Window#FEATURE_ACTION_BAR_OVERLAY} it will resize application
* content to fit the new space available.
*/
public abstract void show();
/**
* Hide the ActionBar if it is currently showing.
* If the window hosting the ActionBar does not have the feature
* {@link Window#FEATURE_ACTION_BAR_OVERLAY} it will resize application
* content to fit the new space available.
*/
public abstract void hide();
/**
* @return <code>true</code> if the ActionBar is showing, <code>false</code> otherwise.
*/
public abstract boolean isShowing();
/**
* Add a listener that will respond to menu visibility change events.
*
* @param listener The new listener to add
*/
public abstract void addOnMenuVisibilityListener(OnMenuVisibilityListener listener);
/**
* Remove a menu visibility listener. This listener will no longer receive menu
* visibility change events.
*
* @param listener A listener to remove that was previously added
*/
public abstract void removeOnMenuVisibilityListener(OnMenuVisibilityListener listener);
/**
* Enable or disable the "home" button in the corner of the action bar. (Note that this
* is the application home/up affordance on the action bar, not the systemwide home
* button.)
*
* <p>This defaults to true for packages targeting < API 14. For packages targeting
* API 14 or greater, the application should call this method to enable interaction
* with the home/up affordance.
*
* <p>Setting the {@link #DISPLAY_HOME_AS_UP} display option will automatically enable
* the home button.
*
* @param enabled true to enable the home button, false to disable the home button.
*/
public void setHomeButtonEnabled(boolean enabled) { }
/**
* Returns a {@link Context} with an appropriate theme for creating views that
* will appear in the action bar. If you are inflating or instantiating custom views
* that will appear in an action bar, you should use the Context returned by this method.
* (This includes adapters used for list navigation mode.)
* This will ensure that views contrast properly against the action bar.
*
* @return A themed Context for creating views
*/
public Context getThemedContext() { return null; }
/**
* Listener interface for ActionBar navigation events.
*/
public interface OnNavigationListener {
/**
* This method is called whenever a navigation item in your action bar
* is selected.
*
* @param itemPosition Position of the item clicked.
* @param itemId ID of the item clicked.
* @return True if the event was handled, false otherwise.
*/
public boolean onNavigationItemSelected(int itemPosition, long itemId);
}
/**
* Listener for receiving events when action bar menus are shown or hidden.
*/
public interface OnMenuVisibilityListener {
/**
* Called when an action bar menu is shown or hidden. Applications may want to use
* this to tune auto-hiding behavior for the action bar or pause/resume video playback,
* gameplay, or other activity within the main content area.
*
* @param isVisible True if an action bar menu is now visible, false if no action bar
* menus are visible.
*/
public void onMenuVisibilityChanged(boolean isVisible);
}
/**
* A tab in the action bar.
*
* <p>Tabs manage the hiding and showing of {@link Fragment}s.
*/
public static abstract class Tab {
/**
* An invalid position for a tab.
*
* @see #getPosition()
*/
public static final int INVALID_POSITION = -1;
/**
* Return the current position of this tab in the action bar.
*
* @return Current position, or {@link #INVALID_POSITION} if this tab is not currently in
* the action bar.
*/
public abstract int getPosition();
/**
* Return the icon associated with this tab.
*
* @return The tab's icon
*/
public abstract Drawable getIcon();
/**
* Return the text of this tab.
*
* @return The tab's text
*/
public abstract CharSequence getText();
/**
* Set the icon displayed on this tab.
*
* @param icon The drawable to use as an icon
* @return The current instance for call chaining
*/
public abstract Tab setIcon(Drawable icon);
/**
* Set the icon displayed on this tab.
*
* @param resId Resource ID referring to the drawable to use as an icon
* @return The current instance for call chaining
*/
public abstract Tab setIcon(int resId);
/**
* Set the text displayed on this tab. Text may be truncated if there is not
* room to display the entire string.
*
* @param text The text to display
* @return The current instance for call chaining
*/
public abstract Tab setText(CharSequence text);
/**
* Set the text displayed on this tab. Text may be truncated if there is not
* room to display the entire string.
*
* @param resId A resource ID referring to the text that should be displayed
* @return The current instance for call chaining
*/
public abstract Tab setText(int resId);
/**
* Set a custom view to be used for this tab. This overrides values set by
* {@link #setText(CharSequence)} and {@link #setIcon(Drawable)}.
*
* @param view Custom view to be used as a tab.
* @return The current instance for call chaining
*/
public abstract Tab setCustomView(View view);
/**
* Set a custom view to be used for this tab. This overrides values set by
* {@link #setText(CharSequence)} and {@link #setIcon(Drawable)}.
*
* @param layoutResId A layout resource to inflate and use as a custom tab view
* @return The current instance for call chaining
*/
public abstract Tab setCustomView(int layoutResId);
/**
* Retrieve a previously set custom view for this tab.
*
* @return The custom view set by {@link #setCustomView(View)}.
*/
public abstract View getCustomView();
/**
* Give this Tab an arbitrary object to hold for later use.
*
* @param obj Object to store
* @return The current instance for call chaining
*/
public abstract Tab setTag(Object obj);
/**
* @return This Tab's tag object.
*/
public abstract Object getTag();
/**
* Set the {@link TabListener} that will handle switching to and from this tab.
* All tabs must have a TabListener set before being added to the ActionBar.
*
* @param listener Listener to handle tab selection events
* @return The current instance for call chaining
*/
public abstract Tab setTabListener(TabListener listener);
/**
* Select this tab. Only valid if the tab has been added to the action bar.
*/
public abstract void select();
/**
* Set a description of this tab's content for use in accessibility support.
* If no content description is provided the title will be used.
*
* @param resId A resource ID referring to the description text
* @return The current instance for call chaining
* @see #setContentDescription(CharSequence)
* @see #getContentDescription()
*/
public abstract Tab setContentDescription(int resId);
/**
* Set a description of this tab's content for use in accessibility support.
* If no content description is provided the title will be used.
*
* @param contentDesc Description of this tab's content
* @return The current instance for call chaining
* @see #setContentDescription(int)
* @see #getContentDescription()
*/
public abstract Tab setContentDescription(CharSequence contentDesc);
/**
* Gets a brief description of this tab's content for use in accessibility support.
*
* @return Description of this tab's content
* @see #setContentDescription(CharSequence)
* @see #setContentDescription(int)
*/
public abstract CharSequence getContentDescription();
}
/**
* Callback interface invoked when a tab is focused, unfocused, added, or removed.
*/
public interface TabListener {
/**
* Called when a tab enters the selected state.
*
* @param tab The tab that was selected
* @param ft A {@link FragmentTransaction} for queuing fragment operations to execute
* during a tab switch. The previous tab's unselect and this tab's select will be
* executed in a single transaction. This FragmentTransaction does not support
* being added to the back stack.
*/
public void onTabSelected(Tab tab, FragmentTransaction ft);
/**
* Called when a tab exits the selected state.
*
* @param tab The tab that was unselected
* @param ft A {@link FragmentTransaction} for queuing fragment operations to execute
* during a tab switch. This tab's unselect and the newly selected tab's select
* will be executed in a single transaction. This FragmentTransaction does not
* support being added to the back stack.
*/
public void onTabUnselected(Tab tab, FragmentTransaction ft);
/**
* Called when a tab that is already selected is chosen again by the user.
* Some applications may use this action to return to the top level of a category.
*
* @param tab The tab that was reselected.
* @param ft A {@link FragmentTransaction} for queuing fragment operations to execute
* once this method returns. This FragmentTransaction does not support
* being added to the back stack.
*/
public void onTabReselected(Tab tab, FragmentTransaction ft);
}
/**
* Per-child layout information associated with action bar custom views.
*
* @attr ref android.R.styleable#ActionBar_LayoutParams_layout_gravity
*/
public static class LayoutParams extends MarginLayoutParams {
/**
* Gravity for the view associated with these LayoutParams.
*
* @see android.view.Gravity
*/
@ViewDebug.ExportedProperty(category = "layout", mapping = {
@ViewDebug.IntToString(from = -1, to = "NONE"),
@ViewDebug.IntToString(from = Gravity.NO_GRAVITY, to = "NONE"),
@ViewDebug.IntToString(from = Gravity.TOP, to = "TOP"),
@ViewDebug.IntToString(from = Gravity.BOTTOM, to = "BOTTOM"),
@ViewDebug.IntToString(from = Gravity.LEFT, to = "LEFT"),
@ViewDebug.IntToString(from = Gravity.RIGHT, to = "RIGHT"),
@ViewDebug.IntToString(from = Gravity.CENTER_VERTICAL, to = "CENTER_VERTICAL"),
@ViewDebug.IntToString(from = Gravity.FILL_VERTICAL, to = "FILL_VERTICAL"),
@ViewDebug.IntToString(from = Gravity.CENTER_HORIZONTAL, to = "CENTER_HORIZONTAL"),
@ViewDebug.IntToString(from = Gravity.FILL_HORIZONTAL, to = "FILL_HORIZONTAL"),
@ViewDebug.IntToString(from = Gravity.CENTER, to = "CENTER"),
@ViewDebug.IntToString(from = Gravity.FILL, to = "FILL")
})
public int gravity = -1;
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
TypedArray a = c.obtainStyledAttributes(attrs,
com.android.internal.R.styleable.ActionBar_LayoutParams);
gravity = a.getInt(
com.android.internal.R.styleable.ActionBar_LayoutParams_layout_gravity, -1);
a.recycle();
}
public LayoutParams(int width, int height) {
super(width, height);
this.gravity = Gravity.CENTER_VERTICAL | Gravity.LEFT;
}
public LayoutParams(int width, int height, int gravity) {
super(width, height);
this.gravity = gravity;
}
public LayoutParams(int gravity) {
this(WRAP_CONTENT, MATCH_PARENT, gravity);
}
public LayoutParams(LayoutParams source) {
super(source);
this.gravity = source.gravity;
}
public LayoutParams(ViewGroup.LayoutParams source) {
super(source);
}
}
}