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AppCompatDelegateImpl.java
@Override public void initWindowDecorActionBar() { ensureSubDecor(); if (!mHasActionBar || mActionBar != null) { return; } if (mOriginalWindowCallback instanceof Activity) { mActionBar = new WindowDecorActionBar((Activity) mOriginalWindowCallback, mOverlayActionBar); } else if (mOriginalWindowCallback instanceof Dialog) { mActionBar = new WindowDecorActionBar((Dialog) mOriginalWindowCallback); } if (mActionBar != null) { mActionBar.setDefaultDisplayHomeAsUpEnabled(mEnableDefaultActionBarUp); } }WindowDecorActionBar.java
public WindowDecorActionBar(Activity activity, boolean overlayMode) { mActivity = activity; Window window = activity.getWindow(); View decor = window.getDecorView(); init(decor); if (!overlayMode) { mContentView = decor.findViewById(android.R.id.content); } } private void init(View decor) { mOverlayLayout = (ActionBarOverlayLayout) decor.findViewById(R.id.decor_content_parent); if (mOverlayLayout != null) { mOverlayLayout.setActionBarVisibilityCallback(this); } mDecorToolbar = getDecorToolbar(decor.findViewById(R.id.action_bar)); mContextView = (ActionBarContextView) decor.findViewById( R.id.action_context_bar); mContainerView = (ActionBarContainer) decor.findViewById( R.id.action_bar_container); if (mDecorToolbar == null || mContextView == null || mContainerView == null) { throw new IllegalStateException(getClass().getSimpleName() + " can only be used " + "with a compatible window decor layout"); } mContext = mDecorToolbar.getContext(); // This was initially read from the action bar style final int current = mDecorToolbar.getDisplayOptions(); final boolean homeAsUp = (current & DISPLAY_HOME_AS_UP) != 0; if (homeAsUp) { mDisplayHomeAsUpSet = true; } ActionBarPolicy abp = ActionBarPolicy.get(mContext); setHomeButtonEnabled(abp.enableHomeButtonByDefault() || homeAsUp); setHasEmbeddedTabs(abp.hasEmbeddedTabs()); final TypedArray a = mContext.obtainStyledAttributes(null, R.styleable.ActionBar, R.attr.actionBarStyle, 0); // !!! actionBarStyle if (a.getBoolean(R.styleable.ActionBar_hideOnContentScroll, false)) { setHideOnContentScrollEnabled(true); } final int elevation = a.getDimensionPixelSize(R.styleable.ActionBar_elevation, 0); if (elevation != 0) { setElevation(elevation); } a.recycle(); } <style name="Base.V7.Theme.AppCompat.Light" parent="Platform.AppCompat.Light"> //... <!-- Action Bar Styles --> <item name="actionBarTabStyle">@style/Widget.AppCompat.Light.ActionBar.TabView</item> <item name="actionBarTabBarStyle">@style/Widget.AppCompat.Light.ActionBar.TabBar</item> <item name="actionBarTabTextStyle">@style/Widget.AppCompat.Light.ActionBar.TabText</item> <item name="actionButtonStyle">@style/Widget.AppCompat.Light.ActionButton</item> <item name="actionOverflowButtonStyle">@style/Widget.AppCompat.Light.ActionButton.Overflow</item> <item name="actionOverflowMenuStyle">@style/Widget.AppCompat.Light.PopupMenu.Overflow</item> <item name="actionBarStyle">@style/Widget.AppCompat.Light.ActionBar.Solid</item> <item name="actionBarSplitStyle">?attr/actionBarStyle</item> <item name="actionBarWidgetTheme">@null</item> <item name="actionBarTheme">@style/ThemeOverlay.AppCompat.ActionBar</item> <item name="actionBarSize">@dimen/abc_action_bar_default_height_material</item> <item name="actionBarDivider">?attr/dividerVertical</item> <item name="actionBarItemBackground">?attr/selectableItemBackgroundBorderless</item> <item name="actionMenuTextAppearance">@style/TextAppearance.AppCompat.Widget.ActionBar.Menu</item> <item name="actionMenuTextColor">?android:attr/textColorPrimaryDisableOnly</item> </style>actionOverflowButtonStyle
<style name="Widget.AppCompat.Light.ActionButton.Overflow" parent="Widget.AppCompat.ActionButton.Overflow"/> <style name="Widget.AppCompat.ActionButton.Overflow" parent="Base.Widget.AppCompat.ActionButton.Overflow"/> <style name="Base.Widget.AppCompat.ActionButton.Overflow" parent="RtlUnderlay.Widget.AppCompat.ActionButton.Overflow"> <item name="srcCompat">@drawable/abc_ic_menu_overflow_material</item> <item name="android:background">?attr/actionBarItemBackground</item> <item name="android:contentDescription">@string/abc_action_menu_overflow_description</item> <item name="android:minWidth">@dimen/abc_action_button_min_width_overflow_material</item> <item name="android:minHeight">@dimen/abc_action_button_min_height_material</item> </style>abc_ic_menu_overflow_material.xml
<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="24dp" android:height="24dp" android:viewportWidth="24.0" android:viewportHeight="24.0" android:tint="?attr/colorControlNormal"> <path android:pathData="M12,8c1.1,0 2,-0.9 2,-2s-0.9,-2 -2,-2c-1.1,0 -2,0.9 -2,2S10.9,8 12,8zM12,10c-1.1,0 -2,0.9 -2,2s0.9,2 2,2c1.1,0 2,-0.9 2,-2S13.1,10 12,10zM12,16c-1.1,0 -2,0.9 -2,2s0.9,2 2,2c1.1,0 2,-0.9 2,-2S13.1,16 12,16z" android:fillColor="@android:color/white"/> </vector>V21
<style name="Base.Widget.AppCompat.ActionButton.Overflow" parent="android:Widget.Material.ActionButton.Overflow"> <style name="Widget.Material.ActionButton.Overflow"> <item name="src">@drawable/ic_menu_moreoverflow_material</item> <item name="background">?attr/actionBarItemBackground</item> <item name="contentDescription">@string/action_menu_overflow_description</item> <item name="minWidth">@dimen/action_button_min_width_overflow_material</item> <item name="minHeight">@dimen/action_button_min_height_material</item> <item name="paddingStart">@dimen/action_bar_overflow_padding_start_material</item> <item name="paddingEnd">@dimen/action_bar_overflow_padding_end_material</item> </style>