Java ActionBar.DISPLAY_SHOW_HOME屬性代碼示例

@Override
public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item) {
    // Do this before detaching the actionview from the hierarchy, in case
    // it needs to dismiss the soft keyboard, etc.
    if (mExpandedActionView instanceof CollapsibleActionView) {
        ((CollapsibleActionView) mExpandedActionView).onActionViewCollapsed();
    }

    removeView(mExpandedActionView);
    removeView(mExpandedHomeLayout);
    mExpandedActionView = null;
    if ((mDisplayOptions & ActionBar.DISPLAY_SHOW_HOME) != 0) {
        mHomeLayout.setVisibility(VISIBLE);
    }
    if ((mDisplayOptions & ActionBar.DISPLAY_SHOW_TITLE) != 0) {
        if (mTitleLayout == null) {
            initTitle();
        } else {
            mTitleLayout.setVisibility(VISIBLE);
        }
    }
    if (mTabScrollView != null && mNavigationMode == ActionBar.NAVIGATION_MODE_TABS) {
        mTabScrollView.setVisibility(VISIBLE);
    }
    if (mSpinner != null && mNavigationMode == ActionBar.NAVIGATION_MODE_LIST) {
        mSpinner.setVisibility(VISIBLE);
    }
    if (mCustomNavView != null && (mDisplayOptions & ActionBar.DISPLAY_SHOW_CUSTOM) != 0) {
        mCustomNavView.setVisibility(VISIBLE);
    }
    mExpandedHomeLayout.setIcon(null);
    mCurrentExpandedItem = null;
    requestLayout();
    item.setActionViewExpanded(false);

    return true;
}
 

private void initTitle() {
    if (mTitleLayout == null) {
        LayoutInflater inflater = LayoutInflater.from(getContext());
        mTitleLayout = (LinearLayout) inflater.inflate(R.layout.abs__action_bar_title_item,
                this, false);
        mTitleView = (TextView) mTitleLayout.findViewById(R.id.abs__action_bar_title);
        mSubtitleView = (TextView) mTitleLayout.findViewById(R.id.abs__action_bar_subtitle);
        mTitleUpView = mTitleLayout.findViewById(R.id.abs__up);

        mTitleLayout.setOnClickListener(mUpClickListener);

        if (mTitleStyleRes != 0) {
            mTitleView.setTextAppearance(mContext, mTitleStyleRes);
        }
        if (mTitle != null) {
            mTitleView.setText(mTitle);
        }

        if (mSubtitleStyleRes != 0) {
            mSubtitleView.setTextAppearance(mContext, mSubtitleStyleRes);
        }
        if (mSubtitle != null) {
            mSubtitleView.setText(mSubtitle);
            mSubtitleView.setVisibility(VISIBLE);
        }

        final boolean homeAsUp = (mDisplayOptions & ActionBar.DISPLAY_HOME_AS_UP) != 0;
        final boolean showHome = (mDisplayOptions & ActionBar.DISPLAY_SHOW_HOME) != 0;
        mTitleUpView.setVisibility(!showHome ? (homeAsUp ? VISIBLE : INVISIBLE) : GONE);
        mTitleLayout.setEnabled(homeAsUp && !showHome);
    }

    addView(mTitleLayout);
    if (mExpandedActionView != null ||
            (TextUtils.isEmpty(mTitle) && TextUtils.isEmpty(mSubtitle))) {
        // Don't show while in expanded mode or with empty text
        mTitleLayout.setVisibility(GONE);
    }
}
 

@Override
public void onLayout(boolean changed, int l, int t, int r, int b) {
    super.onLayout(changed, l, t, r, b);

    final boolean hasTabs = mTabContainer != null && mTabContainer.getVisibility() != GONE;

    if (mTabContainer != null && mTabContainer.getVisibility() != GONE) {
        final int containerHeight = getMeasuredHeight();
        final int tabHeight = mTabContainer.getMeasuredHeight();

        if ((mActionBarView.getDisplayOptions() & ActionBar.DISPLAY_SHOW_HOME) == 0) {
            // Not showing home, put tabs on top.
            final int count = getChildCount();
            for (int i = 0; i < count; i++) {
                final View child = getChildAt(i);

                if (child == mTabContainer) continue;

                if (!mActionBarView.isCollapsed()) {
                    child.offsetTopAndBottom(tabHeight);
                }
            }
            mTabContainer.layout(l, 0, r, tabHeight);
        } else {
            mTabContainer.layout(l, containerHeight - tabHeight, r, containerHeight);
        }
    }

    boolean needsInvalidate = false;
    if (mIsSplit) {
        if (mSplitBackground != null) {
            mSplitBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight());
            needsInvalidate = true;
        }
    } else {
        if (mBackground != null) {
            mBackground.setBounds(mActionBarView.getLeft(), mActionBarView.getTop(),
                    mActionBarView.getRight(), mActionBarView.getBottom());
            needsInvalidate = true;
        }
        if ((mIsStacked = hasTabs && mStackedBackground != null)) {
            mStackedBackground.setBounds(mTabContainer.getLeft(), mTabContainer.getTop(),
                    mTabContainer.getRight(), mTabContainer.getBottom());
            needsInvalidate = true;
        }
    }

    if (needsInvalidate) {
        invalidate();
    }
}
 

public void setDisplayOptions(int options) {
    final int flagsChanged = mDisplayOptions == -1 ? -1 : options ^ mDisplayOptions;
    mDisplayOptions = options;

    if ((flagsChanged & DISPLAY_RELAYOUT_MASK) != 0) {
        final boolean showHome = (options & ActionBar.DISPLAY_SHOW_HOME) != 0;
        final int vis = showHome && mExpandedActionView == null ? VISIBLE : GONE;
        mHomeLayout.setVisibility(vis);

        if ((flagsChanged & ActionBar.DISPLAY_HOME_AS_UP) != 0) {
            final boolean setUp = (options & ActionBar.DISPLAY_HOME_AS_UP) != 0;
            mHomeLayout.setUp(setUp);

            // Showing home as up implicitly enables interaction with it.
            // In honeycomb it was always enabled, so make this transition
            // a bit easier for developers in the common case.
            // (It would be silly to show it as up without responding to it.)
            if (setUp) {
                setHomeButtonEnabled(true);
            }
        }

        if ((flagsChanged & ActionBar.DISPLAY_USE_LOGO) != 0) {
            final boolean logoVis = mLogo != null && (options & ActionBar.DISPLAY_USE_LOGO) != 0;
            mHomeLayout.setIcon(logoVis ? mLogo : mIcon);
        }

        if ((flagsChanged & ActionBar.DISPLAY_SHOW_TITLE) != 0) {
            if ((options & ActionBar.DISPLAY_SHOW_TITLE) != 0) {
                initTitle();
            } else {
                removeView(mTitleLayout);
            }
        }

        if (mTitleLayout != null && (flagsChanged &
                (ActionBar.DISPLAY_HOME_AS_UP | ActionBar.DISPLAY_SHOW_HOME)) != 0) {
            final boolean homeAsUp = (mDisplayOptions & ActionBar.DISPLAY_HOME_AS_UP) != 0;
            mTitleUpView.setVisibility(!showHome ? (homeAsUp ? VISIBLE : INVISIBLE) : GONE);
            mTitleLayout.setEnabled(!showHome && homeAsUp);
        }

        if ((flagsChanged & ActionBar.DISPLAY_SHOW_CUSTOM) != 0 && mCustomNavView != null) {
            if ((options & ActionBar.DISPLAY_SHOW_CUSTOM) != 0) {
                addView(mCustomNavView);
            } else {
                removeView(mCustomNavView);
            }
        }

        requestLayout();
    } else {
        invalidate();
    }

    // Make sure the home button has an accurate content description for accessibility.
    if (!mHomeLayout.isEnabled()) {
        mHomeLayout.setContentDescription(null);
    } else if ((options & ActionBar.DISPLAY_HOME_AS_UP) != 0) {
        mHomeLayout.setContentDescription(mContext.getResources().getText(
                R.string.abs__action_bar_up_description));
    } else {
        mHomeLayout.setContentDescription(mContext.getResources().getText(
                R.string.abs__action_bar_home_description));
    }
}