Android Launcher3修改长按屏幕空白处进入OverviewMode模式，进入OverviewMode模式点击Home无法复原的bug

如果想控制用户长按空白处，不进入OverviewMode模式，只需修改Laucnher类中的onLongClick方法。

长按workspace的空白处进入OverviewMode模式，如果不想进入，注释掉enterOverviewMode这行代码

if (v instanceof Workspace) {
if (!mWorkspace.isInOverviewMode()) {
if (mWorkspace.enterOverviewMode()) {
mWorkspace.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS,
                    HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
            return true;
        } else {
return false;
        }
    } else {
return false;
    }
}

同样，长按Hostseat空白处，也要控制是否进入OverviewMode模式，处理同上。

// The hotseat touch handling does not go through Workspace, and we always allow long press
// on hotseat items.
final boolean inHotseat = isHotseatLayout(v);
boolean allowLongPress = inHotseat || mWorkspace.allowLongPress();
if (allowLongPress && !mDragController.isDragging()) {
if (itemUnderLongClick == null) {
// User long pressed on empty space
        mWorkspace.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS,
                HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
        if (mWorkspace.isInOverviewMode()) {
mWorkspace.startReordering(v);
        } else {
mWorkspace.enterOverviewMode();
        }
    } else {
final boolean isAllAppsButton = inHotseat && isAllAppsButtonRank(
mHotseat.getOrderInHotseat(
                        longClickCellInfo.cellX,
                        longClickCellInfo.cellY));
        if (!(itemUnderLongClick instanceof Folder || isAllAppsButton)) {
// User long pressed on an item
            mWorkspace.startDrag(longClickCellInfo);
        }
    }
}

进入OverviewMode模式，点击Home无法复原，一直处于OverviewMode模式，无法退出。造成这个问题的原因是

因为Launcher中的hideAppsCustomizeHelper方法判断是否需要退出OverviewMode模式时， boolean initialized = get

AllAppsButton() != null;这里这个参数会一直都是false，以为赋值给该参数的方法判定条件是!LauncherAppState.isDis

ableAllApps()，我修改了这里永远返回true。所以我们从新修改hideAppsCustomizeHelper方法中退出OverviewMode

模式的条件即可。同时也把showAppsCustomizeHelper中的判断方法的initialized 去掉去掉。以免造成不必要的麻烦

    /**
 * Zoom the camera back into the workspace, hiding 'fromView'.
 * This is the opposite of showAppsCustomizeHelper.
 * @param animated If true, the transition will be animated.
 */
 private void hideAppsCustomizeHelper(Workspace.State toState, final boolean animated,
            final boolean springLoaded, final Runnable onCompleteRunnable) {

if (mStateAnimation != null) {
mStateAnimation.setDuration(0);
            mStateAnimation.cancel();
            mStateAnimation = null;
        }

boolean material = Utilities.isLmpOrAbove();
        Resources res = getResources();

        final int duration = res.getInteger(R.integer.config_appsCustomizeZoomOutTime);
        final int fadeOutDuration = res.getInteger(R.integer.config_appsCustomizeFadeOutTime);
        final int revealDuration = res.getInteger(R.integer.config_appsCustomizeConcealTime);
        final int itemsAlphaStagger =
                res.getInteger(R.integer.config_appsCustomizeItemsAlphaStagger);

        final float scaleFactor = (float)
                res.getInteger(R.integer.config_appsCustomizeZoomScaleFactor);
        final View fromView = mAppsCustomizeTabHost;
        final View toView = mWorkspace;
        Animator workspaceAnim = null;
        final ArrayList<View> layerViews = new ArrayList<View>();

        if (toState == Workspace.State.NORMAL) {
            workspaceAnim = mWorkspace.getChangeStateAnimation(
                    toState, animated, layerViews);
        } else if (toState == Workspace.State.SPRING_LOADED ||
                toState == Workspace.State.OVERVIEW) {
            workspaceAnim = mWorkspace.getChangeStateAnimation(
                    toState, animated, layerViews);
        }

// If for some reason our views aren't initialized, don't animate
        boolean initialized = getAllAppsButton() != null;

        /**
 * 修改此处，解决长按空白处显示修改壁纸后点击Home键无法恢复的bug
 *
 * 因为在HotSeat方法中的setAllAppsButton()的条件是！LauncherAppState.isDisableAllApps()
 *
 * 修改默认返回为true后，就不会总setAllAppsButton的方法，所以getAllAppsButton()永远为空
 *
 */

//        if (animated && initialized) {
        if (animated ) {
mStateAnimation = LauncherAnimUtils.createAnimatorSet();
            if (workspaceAnim != null) {
mStateAnimation.play(workspaceAnim);
            }

final AppsCustomizePagedView content = (AppsCustomizePagedView)
                    fromView.findViewById(R.id.apps_customize_pane_content);