AlarmManager 相关用法

6.0 和4.4 是分界点，想要闹钟精确，根据不同版本不同处理

        long l = SystemClock.elapsedRealtime();
        AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
        Intent i = new Intent(this, CheckTinkerUpdateService.class);
        PendingIntent pi = PendingIntent.getService(this, 0, i, 0);
        if (am != null) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                am.setExactAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP, l+ TIME_INTERVAL, pi);
            } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                am.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP, l+ TIME_INTERVAL, pi);
            } else {
                am.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, l+ TIME_INTERVAL, pi);
            }
        }