Android 开发 Tip 19 -- 修改Menu的字体大小和样式

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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>

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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>