android4.2下获取应用程序大小的变更点

android4.2上获取应用程序大小的变更点

        PackageManager.getPackageSizeInfo(String packageName, IPackageStatsObserver observer)不可用，改为PackageManager.getPackageSizeInfo(String packageName, int userHandle, IPackageStatsObserver observer), 至于增加的参数userHandle的解释是：The user whose size information should be retrieved。下面是PackageManager内部的用法：

    public void getPackageSizeInfo(String packageName, IPackageStatsObserver observer) {
        getPackageSizeInfo(packageName, UserHandle.myUserId(), observer);
    }

        因此，把UserHandle.myUserId()的实作部分整合进来就可用了：

    private void getPacakgeStats(String pkgName) {
        if (pkgName != null) {
            try {
                Method getPackageSizeInfo = mPm.getClass().getDeclaredMethod("getPackageSizeInfo", String.class,
                        int.class, IPackageStatsObserver.class);
                /**
                 * after invoking, PkgSizeObserver.onGetStatsCompleted() will be called as callback function. <br>
                 * About the third parameter ‘Process.myUid() / 100000’，please check:
                 * <android_source>/frameworks/base/core/java/android/content/pm/PackageManager.java:
                 * getPackageSizeInfo(packageName, UserHandle.myUserId(), observer);
                 */
                getPackageSizeInfo.invoke(mPm, pkgName, Process.myUid() / 100000, new PkgSizeObserver());
            } catch (Exception e) {
                Log.e(TAG, e.toString());
            }
        }
    }