android 当目录路径从n层按back键退回到n-19层的时候，file manager自己主动退出

当目录路径从n层按back键退回到n-19层的时候，file manager自己主动退出，比方在63层按back 键退回到44层的时候，file manager自己主动退出。

 

1.FileManager默认设计, FileManager种仅仅记录最多20条操作路径的记录, 假设超出就会把最早增加的记录删除. 贵司能够參考alps/mediatek/packages/apps/FileManager/src/com/mediatek/filemanager/FileInfoManager.java中这部分的代码．

    /** Max history size */

    private static final int MAX_LIST_SIZE = 20;

    private final List<NavigationRecord> mNavigationList = new LinkedList<NavigationRecord>();

    /**

     * This method gets the previous navigation directory path

     * 

     * @return the previous navigation path

     */

    protected NavigationRecord getPrevNavigation() {

        while (!mNavigationList.isEmpty()) {

            NavigationRecord navRecord = mNavigationList.get(mNavigationList.size() - 1);

            removeFromNavigationList();

            String path = navRecord.getRecordPath();

            if (!TextUtils.isEmpty(path)) {

                if (new File(path).exists() || MountPointManager.getInstance().isRootPath(path)) {

                    return navRecord;

                }

            }

        }

        return null;

    }

    /**

     * This method adds a navigationRecord to the navigation history

     * 

     * @param navigationRecord the Record

     */

    protected void addToNavigationList(NavigationRecord navigationRecord) {

        if (mNavigationList.size() <= MAX_LIST_SIZE) {

            mNavigationList.add(navigationRecord);

        } else {

            mNavigationList.remove(0);

            mNavigationList.add(navigationRecord);

        }

    }

    /**

     * This method removes a directory path from the navigation history

     */

    protected void removeFromNavigationList() {

        if (!mNavigationList.isEmpty()) {

            mNavigationList.remove(mNavigationList.size() - 1);

        }

    }

 

 

2.对于20条操作路径的history record, 贵司能够改动，仅仅须要把FileInfo.Manager.java中的MAX_LIST_SIZE设为须要的最大路径记录数。这样改动带来的影响是，file manager APK可能会用到很多其它的内存，由于List<NavigationRecord> mNavigationList须要记录很多其它的路径数。

alps/mediatek/packages/apps/FileManager/src/com/mediatek/filemanager/FileInfoManager.java中这部分的代码．

    /** Max history size */

    private static final int MAX_LIST_SIZE = xxx;