负一屏整体框架

负一屏创建时机

1、workspace页面顺序

2、负一屏的加入和view的填充

负一屏创建时机

负一屏的创建在Launcher.java的bindScreens中，该方法：

1、bindAddScreens传入一个界面列表，循环往workspace中添加需要的界面

2、判断是否需要添加左屏（也就是负一屏），如果需要则在workspace.java的createCustomContentContainer中完成该页面的添加。

populateCustomContentContainer中完成页面内容的填充。

    @Overridepublic void bindScreens(ArrayList<Long> orderedScreenIds) {bindAddScreens(orderedScreenIds);// If there are no screens, we need to have an empty screenif (orderedScreenIds.size() == 0) {mWorkspace.addExtraEmptyScreen();}// Create the custom content page (this call updates mDefaultScreen which calls// setCurrentPage() so ensure that all pages are added before calling this).if (needCustomContentToLeft()) {mWorkspace.createCustomContentContainer();populateCustomContentContainer();}}

1、workspace页面顺序

bindAddScreens中，循环添加页面

@Overridepublic void bindAddScreens(ArrayList<Long> orderedScreenIds) {int count = orderedScreenIds.size();for (int i = 0; i < count; i++) {mWorkspace.insertNewWorkspaceScreenBeforeEmptyScreen(orderedScreenIds.get(i));}}

public long insertNewWorkspaceScreenBeforeEmptyScreen(long screenId) {// Find the index to insert this view into.  If the empty screen exists, then// insert it before that.int insertIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);if (insertIndex < 0) {insertIndex = mScreenOrder.size();}return insertNewWorkspaceScreen(screenId, insertIndex);}

public long insertNewWorkspaceScreen(long screenId, int insertIndex) {if (mWorkspaceScreens.containsKey(screenId)) {throw new RuntimeException("Screen id " + screenId + " already exists!");}// Inflate the cell layout, but do not add it automatically so that we can get the newly// created CellLayout.CellLayout newScreen = (CellLayout) mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, this, false /* attachToRoot */);//Added by ****** in 2017-6-26 for drag icon InOverviewMode(bug)if (isInOverviewMode() && !mLauncher.isEditing()) {newScreen.getPageSetting().setVisibility(VISIBLE);}//Added by ****** in 2017-6-26for drag icon InOverviewMode(bug)newScreen.setOnLongClickListener(mLongClickListener);newScreen.setOnClickListener(mLauncher);newScreen.setSoundEffectsEnabled(false);mWorkspaceScreens.put(screenId, newScreen);mScreenOrder.add(insertIndex, screenId);addView(newScreen, insertIndex);//添加view到指定的下标changePageSettingColor();LauncherAccessibilityDelegate delegate =LauncherAppState.getInstance().getAccessibilityDelegate();if (delegate != null && delegate.isInAccessibleDrag()) {newScreen.enableAccessibleDrag(true, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);}return screenId;}

这样就完成了workspace的页面添加。

2、负一屏的加入和view的填充

负一屏页面的添加：mWorkspace.createCustomContentContainer();

public void createCustomContentContainer() {CellLayout customScreen = (CellLayout)mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, this, false);customScreen.disableDragTarget();customScreen.disableJailContent();mWorkspaceScreens.put(CUSTOM_CONTENT_SCREEN_ID, customScreen);mScreenOrder.add(0, CUSTOM_CONTENT_SCREEN_ID);// We want no padding on the custom contentcustomScreen.setPadding(0, 0, 0, 0);//负一屏边距if (mLauncher!=null&&mLauncher.needCustomContentToLeft()){CustomPageManager.getInstance(mLauncher).setInsets(insetsRealSize);}addFullScreenPage(customScreen);//添加到workspace// Ensure that the current page and default page are maintained.// Added by huanghaihao in 2017-6-26 for screen setting startint pageIndex = getPageIndexForScreenId(mDefaultPageScreenId);if (-1 != pageIndex) {mDefaultPage = pageIndex;} else {mDefaultPage = mOriginalDefaultPage + 1;}// Added by huanghaihao in 2017-6-26 for screen setting end// Update the custom content hintif (mRestorePage != INVALID_RESTORE_PAGE) {mRestorePage = mRestorePage + 1;} else {setCurrentPage(getCurrentPage() + 1);}}

以上可以看出，addFullScreenPage方法决定了添加动作。方法体内部，固定的把负一屏添加到了首位：

public void addFullScreenPage(View page) {LayoutParams lp = generateDefaultLayoutParams();lp.isFullScreenPage = true;super.addView(page, 0, lp);//添加view到指定的下标}

负一屏view的填充：populateCustomContentContainer();

protected void populateCustomContentContainer() {//if (mLauncherCallbacks != null) {//    mLauncherCallbacks.populateCustomContentContainer();//}//负一屏viewView customView = CustomPageManager.getInstance(null).getCustomPageView();Log.i(TAG, "populateCustomContentContainer customView="+customView);addToCustomContentPage(customView,null,"");}

以上，添加view到负一屏的页面，可以看出，view的实现根据产品的界面。最简单的 new情况，一个textview也能看到效果。负一屏的本质其实就是一个view。

public void addToCustomContentPage(View customContent, Launcher.CustomContentCallbacks callbacks,String description) {if (getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID) < 0) {throw new RuntimeException("Expected custom content screen to exist");}// Add the custom content to the full screen custom pageCellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);int spanX = customScreen.getCountX();int spanY = customScreen.getCountY();CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, spanX, spanY);lp.canReorder = false;lp.isFullscreen = true;if (customContent instanceof Insettable) {((Insettable) customContent).setInsets(mInsets,insetsRealSize);}// Verify that the child is removed from any existing parent.if (customContent.getParent() instanceof ViewGroup) {ViewGroup parent = (ViewGroup) customContent.getParent();parent.removeView(customContent);}customScreen.removeAllViews();customContent.setFocusable(true);customContent.setOnKeyListener(new FullscreenKeyEventListener());//delete by linhai remove focusChange start 31/8/2017
//        customContent.setOnFocusChangeListener(mLauncher.mFocusHandler
//                .getHideIndicatorOnFocusListener());//delete by linhai remove focusChange start 31/8/2017customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);mCustomContentDescription = description;mCustomContentCallbacks = callbacks;if (mLauncher != null && mLauncher.needCustomContentToLeft()){CustomPageManager.getInstance(mLauncher).addCustomPageComplete();}}

至于一层一层add，workspace中add Celllayout，Celllayout中add ShortcutAndWidgetContainer，ShortcutAndWidgetContainer最后addCustompageView。

都是Launcher结构的套路。其本质就是viewGroup的addView，因为workspace、Celllayout、ShortcutAndWidgetContainer都是viewGroup的子类。

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Launcher负一屏---创建和添加流程

负一屏整体框架

负一屏创建时机

1、workspace页面顺序

2、负一屏的加入和view的填充

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