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/* * Copyright (C) 2010 The Android Open Source Project */* w w w. j a va 2 s . c o m*/ * 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 com.actionbarsherlock.app; import android.content.Context; import android.content.res.TypedArray; import android.graphics.drawable.Drawable; import android.support.v4.app.FragmentTransaction; 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.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 = android.app.ActionBar.NAVIGATION_MODE_STANDARD; /** * 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 = android.app.ActionBar.NAVIGATION_MODE_LIST; /** * 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 = android.app.ActionBar.NAVIGATION_MODE_TABS; /** * 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 = android.app.ActionBar.DISPLAY_USE_LOGO; /** * 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 = android.app.ActionBar.DISPLAY_SHOW_HOME; /** * 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 = android.app.ActionBar.DISPLAY_HOME_AS_UP; /** * 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 = android.app.ActionBar.DISPLAY_SHOW_TITLE; /** * 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 = android.app.ActionBar.DISPLAY_SHOW_CUSTOM; /** * 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 { private static final int[] ATTRS = new int[] { android.R.attr.layout_gravity }; /** * Gravity for the view associated with these LayoutParams. * * @see android.view.Gravity */ @ViewDebug.ExportedProperty(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, ATTRS); gravity = a.getInt(0, -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, FILL_PARENT, gravity); } public LayoutParams(LayoutParams source) { super(source); this.gravity = source.gravity; } public LayoutParams(ViewGroup.LayoutParams source) { super(source); } } }