最近接了个工作，去除公司设备上Launcher的抽屉，所有应用单层展示。网上也查找了一番，最终摸索着基本完成了工作，在此记录下去除抽屉的所有操作。

去掉searchBox bar

  1. packages/apps/Launcher3/res/layout/qsb_default_view.xml

    屏蔽掉FrameLayout中的布局

  2. packages/apps/Launcher3/src/com/android/launcher3/QsbContainerView.java

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    private View getDefaultView(LayoutInflater inflater, ViewGroup parent, boolean showSetup) {
                View v = inflater.inflate(R.layout.qsb_default_view, parent, false);
                // if (showSetup) {
                //     View setupButton = v.findViewById(R.id.btn_qsb_setup);
                //     setupButton.setVisibility(View.VISIBLE);
                //     setupButton.setOnClickListener(this);
                // }
                // v.findViewById(R.id.btn_qsb_search).setOnClickListener(this);
                return v;
            }
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    @Override
            public void onClick(View view) {
                // if (view.getId() == R.id.btn_qsb_search) {
                //     getActivity().startSearch("", false, null, true);
                // } else if (view.getId() == R.id.btn_qsb_setup) {
                //     // Allocate a new widget id for QSB
                //     sSavedWidgetId = Launcher.getLauncher(getActivity())
                //             .getAppWidgetHost().allocateAppWidgetId();
                //     // Start intent for bind the widget
                //     Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_BIND);
                //     intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, sSavedWidgetId);
                //     intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_PROVIDER, mWidgetInfo.provider);
                //     startActivityForResult(intent, REQUEST_BIND_QSB);
                // }
            }

  3. packages/apps/Launcher3/src/com/android/launcher3/Workspace.java

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    public void addToCustomContentPage(View customContent, 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 page
            CellLayout 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);
            }

            // 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());
            customContent.setOnFocusChangeListener(mLauncher.mFocusHandler
                    .getHideIndicatorOnFocusListener());
            // customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);
            mCustomContentDescription = description;

            mCustomContentCallbacks = callbacks;
        }

去掉向上滑动的箭头

packages/apps/Launcher3/src/com/android/launcher3/pageindicators/PageIndicatorLineCaret.java

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@Override
   protected void onFinishInflate() {
       super.onFinishInflate();
       mAllAppsHandle = (ImageView) findViewById(R.id.all_apps_handle);
       mAllAppsHandle.setImageDrawable(getCaretDrawable());
       mAllAppsHandle.setOnTouchListener(mLauncher.getHapticFeedbackTouchListener());
       mAllAppsHandle.setOnClickListener(mLauncher);
       mAllAppsHandle.setOnLongClickListener(mLauncher);
       mAllAppsHandle.setOnFocusChangeListener(mLauncher.mFocusHandler);
       mAllAppsHandle.setVisibility(8); // View.GONE
       mLauncher.setAllAppsButton(mAllAppsHandle);
   }

去掉第一屏firstPage

packages/apps/Launcher3/src/com/android/launcher3/Workspace.java

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public void removeAllWorkspaceScreens() {
       // Disable all layout transitions before removing all pages to ensure that we don't get the
       // transition animations competing with us changing the scroll when we add pages or the
       // custom content screen
       disableLayoutTransitions();

       // Since we increment the current page when we call addCustomContentPage via bindScreens
       // (and other places), we need to adjust the current page back when we clear the pages
       if (hasCustomContent()) {
           removeCustomContentPage();
       }

       // Recycle the QSB widget
       View qsb = findViewById(getEmbeddedQsbId());
       if (qsb != null) {
           ((ViewGroup) qsb.getParent()).removeView(qsb);
       }

       // Remove the pages and clear the screen models
       removeAllViews();
       mScreenOrder.clear();
       mWorkspaceScreens.clear();

       // Ensure that the first page is always present
       // bindAndInitFirstWorkspaceScreen(qsb); // 删除第一屏

       // Re-enable the layout transitions
       enableLayoutTransitions();
   }

去掉hotseat

1.packages/apps/Launcher3/res/xml/default_workspace_5x6.xml

packages/apps/Launcher3/res/xml/default_workspace_5x5.xml

屏蔽Hotseat布局

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<!-- Hotseat -->
   <!-- <include launcher:workspace="@xml/dw_phone_hotseat" /> -->
  1. packages/apps/Launcher3/src/com/android/launcher3/DeviceProfile.java
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// Layout the page indicators
        View pageIndicator = launcher.findViewById(R.id.page_indicator);
        if (pageIndicator != null) {
            lp = (FrameLayout.LayoutParams) pageIndicator.getLayoutParams();
            if (isVerticalBarLayout()) {
                if (mInsets.left > 0) {
                    lp.leftMargin = mInsets.left + pageIndicatorLandGutterLeftNavBarPx -
                            lp.width - pageIndicatorLandWorkspaceOffsetPx;
                } else if (mInsets.right > 0) {
                    lp.leftMargin = pageIndicatorLandGutterRightNavBarPx - lp.width -
                            pageIndicatorLandWorkspaceOffsetPx;
                }
                lp.bottomMargin = workspacePadding.bottom;
            } else {
                // Put the page indicators above the hotseat
                lp.gravity = Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM;
                lp.height = pageIndicatorHeightPx;
                lp.bottomMargin = 10; // 距离底部10dp，占掉Hotseat的位置
            }
            pageIndicator.setLayoutParams(lp);
        }

  1. packages/apps/Launcher3/src/com/android/launcher3/Workspace.java

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    mDragController.addDragListener(new AccessibileDragListenerAdapter(
                       this, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG) {
                   @Override
                   protected void enableAccessibleDrag(boolean enable) {
                       super.enableAccessibleDrag(enable);
                       // setEnableForLayout(mLauncher.getHotseat().getLayout(),enable);
                 
                   }
               });
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    /**
        * Returns a list of all the CellLayouts in the workspace.
        */
       ArrayList<CellLayout> getWorkspaceAndHotseatCellLayouts() {
           ArrayList<CellLayout> layouts = new ArrayList<CellLayout>();
           int screenCount = getChildCount();
           for (int screen = 0; screen < screenCount; screen++) {
               layouts.add(((CellLayout) getChildAt(screen)));
           }
           if (mLauncher.getHotseat() != null) {
               // layouts.add(mLauncher.getHotseat().getLayout());
           }
           return layouts;
       }
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    if (mLauncher.getHotseat() != null && !isDragWidget(d)) {
               if (isPointInSelfOverHotseat(d.x, d.y)) {
                   // layout = mLauncher.getHotseat().getLayout();
               }
           }

  2. packages/apps/Launcher3/src/com/android/launcher3/Launcher.java

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    private void loadExtractedColorsAndColorItems() {
           // TODO: do this in pre-N as well, once the extraction part is complete.
           if (Utilities.isNycOrAbove()) {
               mExtractedColors.load(this);
               // mHotseat.updateColor(mExtractedColors, !mPaused);
               ...
           }
       }

去掉向上滑动显示AllApps的动画效果

packages/apps/Launcher3/src/com/android/launcher3/Launcher.java

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public void showOverviewMode(boolean animated) {

        //showOverviewMode(animated, false);

    }

packages/apps/Launcher3/src/com/android/launcher3/dragndrop/DragLayer.java

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if (mDragController.onInterceptTouchEvent(ev)) {
           mActiveController = mDragController;
           return true;
       }

       // if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP && mAllAppsController.onInterceptTouchEvent(ev)) {
       //     mActiveController = mAllAppsController;
       //     return true;
       // }

       if (mPinchListener != null && mPinchListener.onInterceptTouchEvent(ev)) {
           // Stop listening for scrolling etc. (onTouchEvent() handles the rest of the pinch.)
           mActiveController = mPinchListener;
           return true;
       }

7.packages/apps/Launcher3/src/com/android/launcher3/Launcher.java

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/**
    * Shows the apps view.
    */
   public void showAppsView(boolean animated, boolean updatePredictedApps,
           boolean focusSearchBar) {
       // markAppsViewShown();
       // if (updatePredictedApps) {
       //     tryAndUpdatePredictedApps();
       // }
       // showAppsOrWidgets(State.APPS, animated, focusSearchBar);
   }

当安装新应用时，安装的应用添加在第一层上

packages/apps/Launcher3/src/com/android/launcher3/LauncherModel.java

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final HashMap<ComponentName, AppInfo> addedOrUpdatedApps = new HashMap<>();

           if (added != null) {
               final ArrayList<ItemInfo> addedInfos = new ArrayList<ItemInfo>(added);
               addAndBindAddedWorkspaceItems(context, addedInfos);

               // addAppsToAllApps(context, added);
               for (AppInfo ai : added) {
                   addedOrUpdatedApps.put(ai.componentName, ai);
               }
           }

去掉长按时的删除选项

packages/apps/Launcher3/src/com/android/launcher3/DeleteDropTarget.java

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/** @return true for items that should have a "Remove" action in accessibility. */
public static boolean supportsAccessibleDrop(ItemInfo info) {
    return false;
    // return (info instanceof ShortcutInfo)
    //         || (info instanceof LauncherAppWidgetInfo)
    //         || (info instanceof FolderInfo);
}

@Override
protected boolean supportsDrop(DragSource source, ItemInfo info) {
    return false;
}

去掉桌面长按 、pinch捏动作

packages/apps/Launcher3/src/com/android/launcher3/Launcher.java

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/**
    * Shows the overview button.
    */
   public void showOverviewMode(boolean animated) {
       // showOverviewMode(animated, false);
   }

packages/apps/Launcher3/src/com/android/launcher3/PinchAnimationManager.java

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/**
    * Animates to the specified progress. This should be called repeatedly throughout the pinch
    * gesture to run animations that interpolate throughout the gesture.
    * @param interpolatedProgress The progress from 0 to 1, where 0 is overview and 1 is workspace.
    */
   public void setAnimationProgress(float interpolatedProgress) {
       float interpolatedScale = interpolatedProgress * (1f - mOverviewScale) + mOverviewScale;
       float interpolatedTranslationY = (1f - interpolatedProgress) * mOverviewTranslationY;
       // mWorkspace.setScaleX(interpolatedScale);
       // mWorkspace.setScaleY(interpolatedScale);
       // mWorkspace.setTranslationY(interpolatedTranslationY);
       // setOverviewPanelsAlpha(1f - interpolatedProgress, 0);
   }
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public void animateThreshold(float threshold, Workspace.State startState,
          Workspace.State goingTowards) {
      // if (threshold == PinchThresholdManager.THRESHOLD_ONE) {
      //     if (startState == OVERVIEW) {
      //         animateOverviewPanelButtons(goingTowards == OVERVIEW);
      //     } else if (startState == NORMAL) {
      //         animateHotseatAndQsb(goingTowards == NORMAL);
      //     }
      // } else 
      // if (threshold == PinchThresholdManager.THRESHOLD_TWO) {
      //     if (startState == OVERVIEW) {
      //         animateHotseatAndQsb(goingTowards == NORMAL);
      //         animateScrim(goingTowards == OVERVIEW);
      //     } else if (startState == NORMAL) {
      //         animateOverviewPanelButtons(goingTowards == OVERVIEW);
      //         animateScrim(goingTowards == OVERVIEW);
      //     }
      // } else if (threshold == PinchThresholdManager.THRESHOLD_THREE) {
      //     // Passing threshold 3 ends the pinch and snaps to the new state.
      //     if (startState == OVERVIEW && goingTowards == NORMAL) {
      //         mLauncher.showWorkspace(true);
      //         mWorkspace.snapToPage(mWorkspace.getCurrentPage());
      //     } else if (startState == NORMAL && goingTowards == OVERVIEW) {
      //         mLauncher.showOverviewMode(true);
      //     }
      // } else {
          Log.e(TAG, "Received unknown threshold to animate: " + threshold);
      // }
  }

修改无抽屉时的异常

packages/apps/Launcher3/src/com/android/launcher3/allapps/AllAppsTransitionController.java

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mDiscoBounceAnimation.setTarget(this);
       if(mAppsView != null){ // 增加判断
           mAppsView.post(new Runnable() {
               @Override
               public void run() {
                   if (mDiscoBounceAnimation == null) {
                       return;
                   }
                   mDiscoBounceAnimation.start();
               }
           });
       }

packages/apps/Launcher3/src/com/android/launcher3/dragndrop/DragController.java

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private PointF isFlingingToDelete(DragSource source) {
      if (true) return null;

屏蔽生成文件夹

packages/apps/Launcher3/src/com/android/launcher3/Workspace.java

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boolean createUserFolderIfNecessary(View newView, long container, CellLayout target,
        int[] targetCell, float distance, boolean external, DragView dragView,
        Runnable postAnimationRunnable) {
            if(container == -100){ //禁止形成文件夹
                return false;
            }