Android8.1 MTK 平台 Launcher3 修改定制

一、去掉默认 Google 搜索栏

修改位置

vendor\mediatek\proprietary\packages\apps\Launcher3\src\com\android\launcher3\Workspace.java

注释 bindAndInitFirstWorkspaceScreen（） 中 if (qsb == null) 开始到结尾

public void bindAndInitFirstWorkspaceScreen(View qsb) {
        if (!FeatureFlags.QSB_ON_FIRST_SCREEN) {
            return;
        }
        // Add the first page
        CellLayout firstPage = insertNewWorkspaceScreen(Workspace.FIRST_SCREEN_ID, 0);
        if (FeatureFlags.PULLDOWN_SEARCH) {
            .....
        }
        //add don't show google quick search box[qsb]
        // Always add a QSB on the first screen.
        /*if (qsb == null) {
            // In transposed layout, we add the QSB in the Grid. As workspace does not touch the
            // edges, we do not need a full width QSB.
            qsb = LayoutInflater.from(getContext())
                    .inflate(R.layout.search_container_workspace,firstPage, false);
        }

        
        CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, firstPage.getCountX(), 1);
        lp.canReorder = false;
        if (!firstPage.addViewToCellLayout(qsb, 0, R.id.search_container_workspace, lp, true)) {
            Log.e(TAG, "Failed to add to item at (0, 0) to CellLayout");
        }*/
        //add don't show google quick search box[qsb]
    }

二、去掉所有 app 界面搜索应用栏

修改位置

vendor\mediatek\proprietary\packages\apps\Launcher3\src\com\android\launcher3\allapps\AllAppsContainerView.java

在 onFinishInflate() 中添加一行 mSearchContainer.setVisibility(View.GONE);

@Override
protected void onFinishInflate() {
    super.onFinishInflate();

    ....

    mSearchContainer = findViewById(R.id.search_container_all_apps);
    mSearchUiManager = (SearchUiManager) mSearchContainer;
    mSearchUiManager.initialize(mApps, mAppsRecyclerView);

    /// add this code don't show all app quick search box
    mSearchContainer.setVisibility(View.GONE);

    ......
}

三、hotseat 中添加老版本的所有应用图标，并去除上滑箭头和屏蔽 Drag 动画

修改位置

• 1、 添加所有 app 按钮

vendor\mediatek\proprietary\packages\apps\Launcher3\src\com\android\launcher3\Hotseat.java

在 resetLayout() 中将 FeatureFlags.NO_ALL_APPS_ICON 写成 true 则默认加载六个点按钮

void resetLayout() {
        mContent.removeAllViewsInLayout();
        //change true    default add all app button
        if (/*!FeatureFlags.NO_ALL_APPS_ICON*/true) {
            // Add the Apps button
            Context context = getContext();
            DeviceProfile grid = mLauncher.getDeviceProfile();
            int allAppsButtonRank = grid.inv.getAllAppsButtonRank();

            LayoutInflater inflater = LayoutInflater.from(context);
            TextView allAppsButton = (TextView)
                    inflater.inflate(R.layout.all_apps_button, mContent, false);
            Drawable d = context.getResources().getDrawable(R.drawable.all_apps_button_icon);
            d.setBounds(0, 0, grid.iconSizePx, grid.iconSizePx);

            ...
        }
    }

• 2、去除上滑箭头

vendor\mediatek\proprietary\packages\apps\Launcher3\res\layout-land\launcher.xml

给 PageIndicatorCaretLandscape 控件添加 gone 属性，注意我此处修改的是横屏的版本，若你是竖屏则修改

layout 文件夹下 launcher.xml

<com.android.launcher3.pageindicators.PageIndicatorCaretLandscape
            android:id="@+id/page_indicator"
            android:theme="@style/HomeScreenElementTheme"
            android:layout_width="@dimen/dynamic_grid_min_page_indicator_size"
            android:layout_height="@dimen/dynamic_grid_min_page_indicator_size"
            android:layout_gravity="bottom|left"
            android:visibility="gone"/>

此处添加完成后小箭头确实不显示了，但是当你在 workspace 长按时，小箭头又出现了，坑爹的找了半天，最终终

于搞定了。

vendor\mediatek\proprietary\packages\apps\Launcher3\src\com\android\launcher3\pageindicators\PageIndicatorCaretLandscape.java

@Override
protected void onDraw(Canvas canvas) {
    //annotaion for longclick don't show up arrow
    /*Rect drawableBounds = getCaretDrawable().getBounds();
    int count = canvas.save();
    canvas.translate((getWidth() - drawableBounds.width()) / 2,
            getHeight() - drawableBounds.height());
    getCaretDrawable().draw(canvas);
    canvas.restoreToCount(count);*/
}

注释 onDraw() 的方法体就好了，因为当你长按 workSpace 时，触发长按事件，最终调用了 Launcher

中的 showOverviewMode()，通过 mWorkspace.setVisibility(View.VISIBLE);

PageIndicatorCaretLandscape 和 Workspace 是绑定的，导致 onDraw 执行，重新绘制。

• 3、屏蔽 Drag 动画

vendor\mediatek\proprietary\packages\apps\Launcher3\src\com\android\launcher3\allapps\AllAppsTransitionController.java

 @Override
    public boolean onDrag(float displacement, float velocity) {
        Log.e("Launcher3", "onDrag()");
        if (true)  return true;
        //add for forbidden workspace drag change GradientView alph

        if (mAppsView == null) {
            return false;   // early termination.
        }

        mContainerVelocity = velocity;

        float shift = Math.min(Math.max(0, mShiftStart + displacement), mShiftRange);
        setProgress(shift / mShiftRange);

        return true;
    }

    @Override
    public void onDragEnd(float velocity, boolean fling) {
        Log.e("Launcher3", "onDragEnd()");
        //add for forbidden workspace drag change GradientView alph
        if (true){
            if (velocity < 0) {
                mLauncher.showWorkspace(true);
            }
            return;
        }  
        //add for forbidden workspace drag change GradientView alph

        if (mAppsView == null) {
            return; // early termination.
        }

        final int containerType = mTouchEventStartedOnHotseat
                ? ContainerType.HOTSEAT : ContainerType.WORKSPACE;

        if (fling) {
            if (velocity < 0) {
                calculateDuration(velocity, mAppsView.getTranslationY());

                if (!mLauncher.isAllAppsVisible()) {
                    mLauncher.getUserEventDispatcher().logActionOnContainer(
                            Action.Touch.FLING,
                            Action.Direction.UP,
                            containerType);
                }
                mLauncher.showAppsView(true /* animated */, false /* updatePredictedApps */);
                if (hasSpringAnimationHandler()) {
                    mSpringAnimationHandler.add(mSearchSpring, true /* setDefaultValues */);
                    // The icons are moving upwards, so we go to 0 from 1. (y-axis 1 is below 0.)
                    mSpringAnimationHandler.animateToFinalPosition(0 /* pos */, 1 /* startValue */);
                }
            } else {
                calculateDuration(velocity, Math.abs(mShiftRange - mAppsView.getTranslationY()));
                mLauncher.showWorkspace(true);
            }
            // snap to top or bottom using the release velocity
        }

	.....

}

分别在 onDrag() 和 onDragEnd() 回调方法中直接 return，需要注意的是在 onDragEnd 中需要将

workSpace 的状态复原，不然下一次点击所有APP 按钮时，会出现白屏现象。

四、图标长按拖拽至最左侧删除卸载区域不对 bug

alps\vendor\mediatek\proprietary\packages\apps\Launcher3\src\com\android\launcher3\DeviceProfile.java

public void layout(Launcher launcher, boolean notifyListeners) {
        FrameLayout.LayoutParams lp;
        boolean hasVerticalBarLayout = isVerticalBarLayout();

        // Layout the search bar space
        Point searchBarBounds = getSearchBarDimensForWidgetOpts();
        View searchBar = launcher.getDropTargetBar();
        lp = (FrameLayout.LayoutParams) searchBar.getLayoutParams();
        //lp.width = searchBarBounds.x;
        //lp.height = searchBarBounds.y;
        lp.width = 96;
        lp.height = 720;
        lp.topMargin = mInsets.top + edgeMarginPx;
        searchBar.setLayoutParams(lp);
        Log.i("Launcher3.profiles","lp.topMargin ="+lp.topMargin + " width="+lp.width+" height="+lp.height);

        // Layout the workspace
        PagedView workspace = (PagedView) launcher.findViewById(R.id.workspace);
        Rect workspacePadding = getWorkspacePadding(null);
        workspace.setPadding(workspacePadding.left, workspacePadding.top, workspacePadding.right,
                workspacePadding.bottom);
        workspace.setPageSpacing(getWorkspacePageSpacing());
        Log.e("Launcher3.profiles","left="+workspacePadding.left + "   top="+workspacePadding.top
            +" right="+workspacePadding.right + "   bottom="+workspacePadding.bottom);
        Log.d("Launcher3.profiles","setPageSpacing="+getWorkspacePageSpacing());
	
		...

}

DeviceProfile 中的 layout() 方法很关键，你所有看到的界面都是走这来放置控件。通过打印日志发现，没横屏

状态下的宽高分别是 96720, 横屏状态下宽高为 112096，将 searchBar 的宽高强制写成 96*720