在Marshmallow中获取前台应用程序的packageName会延迟3秒

Question

在Android 6.0 Marshmallow中,我使用以下代码查询前台应用程序但是传入通知存在问题,因为它向发送通知的应用程序显示了前台应用程序.问题仅存在于Marshmallow中(5.X正常工作).

// API 21 and above
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public static String getProcessNew(UsageStatsManager mUsageStatsManager, Context c) throws Exception {
        String st = null;
        try {
            long endTime = System.currentTimeMillis();
            long beginTime = endTime - 1000 * 10;

            // We get usage stats for the last minute
            List<UsageStats> stats = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, beginTime,
                    endTime);
            // Sort the stats by the last time used
            if (stats != null) {
                SortedMap<Long, UsageStats> mySortedMap = new TreeMap<Long, UsageStats>();
                for (UsageStats usageStats : stats) {
                    mySortedMap.put(usageStats.getLastTimeUsed(), usageStats);
                }
                if (mySortedMap != null && !mySortedMap.isEmpty()) {
                    st = mySortedMap.get(mySortedMap.lastKey()).getPackageName();
                }
            }

        } catch (Exception e) {
            Log.d("main", "Wxxxxexx " + e);

        }
        return st;
    }

然后使用此答案UsageEvents中的解决方案解决通知问题.

作为答案中的解决方案,我将代码及其工作用于获取Foreground应用程序,但它延迟了3秒.我的服务是检查前台应用程序,并且每隔500毫秒重复一次,但whatsapp程序包在启动whatsapp 3秒后检测到.这是我在上面的解决方案中使用的UsageEvents的代码.

                                if (BuildV >= 23) {
                                    long endTime = System.currentTimeMillis();
                                    long beginTime = endTime - 1000 * 10;
                                    UsageEvents usageEvents = mUsageStatsManager.queryEvents(beginTime, endTime);
                                    UsageEvents.Event event = new UsageEvents.Event();
                                    while (usageEvents.hasNextEvent()) {
                                        usageEvents.getNextEvent(event);
                                    }
                                    if (st.equals(event.getPackageName())
                                            && event.getEventType() == UsageEvents.Event.MOVE_TO_FOREGROUND) {
                                        pack = st;

                                    }
                                }