前因：
我想写一个视频播放的APP，遇到了几个问题就：1快进，快退的时候如何更快，更节省流量的问题；2：还有一个如何做到视频只加载一次；3：Home键中断播放再次打开如何更快的继续播放等问题。
后果：
为此我查看了优酷，56，以及321影音的播放情况，并答应了它们运行时的各项消耗日志，跟我用开源框架写出播放器进行了比较，我几乎做了同样的操作，快进，快退，随意移动播放时间等等，发现56视频超出了我的预料，表现异常的好，借此拿出来跟大家讨论，是否能给出一个56视屏播放时候所用到得思想以及实现策略
下面是几个测试日志以及截图
指定应用的CPU内存监控情况
应用包名：，com.android.china
应用名称：321影音
应用PID:,19523
机器内存大小（MB）:,1,689.18MB
机器CPU型号：， ARMv7 Processor rev 0 (v7l)
机器android系统版本：，4.2.2
手机型号：，HUAWEI P6-T00
UID:,10118
时间,应用占用内存PSS（MB）,应用占用内存比（%）,机器生育内存（MB),应用占用CPU率（%）,CPU总使用率（%）,流量（KB）:
2014-04-04 11:25:36,24.29,1.44,558.46,25.92,71.09,1453
2014-04-04 11:25:41,33.00,1.95,549.09,13.43,58.36,2646
2014-04-04 11:25:46,34.77,2.06,547.25,8.36,45.55,3769
2014-04-04 11:25:51,51.60,3.05,534.20,11.19,49.18,4233
2014-04-04 11:25:56,53.85,3.19,533.08,9.38,52.18,6506
2014-04-04 11:26:02,54.01,3.20,535.67,12.98,62.86,7416
2014-04-04 11:26:07,54.18,3.21,532.15,8.23,35.52,9945
2014-04-04 11:26:12,54.29,3.21,531.25,11.25,46.67,11450
2014-04-04 11:26:17,54.44,3.22,530.91,11.78,51.52,13333
2014-04-04 11:26:22,54.65,3.24,530.37,9.97,39.38,14793
2014-04-04 11:26:28,54.84,3.25,530.51,12.74,55.92,16163
2014-04-04 11:26:33,55.16,3.27,529.11,8.99,42.85,18292
2014-04-04 11:26:38,55.37,3.28,528.67,12.26,55.37,20975
2014-04-04 11:26:43,55.59,3.29,509.11,10.79,51.68,23026
2014-04-04 11:26:49,53.13,3.15,511.59,9.35,75.49,25211
2014-04-04 11:26:54,53.16,3.15,516.36,3.53,51.88,25211
应用包名：，com.rolmex.android.rolplayer
应用名称：RolPlayer
应用PID:,20470
机器内存大小（MB）:,1,689.18MB
机器CPU型号：， ARMv7 Processor rev 0 (v7l)
机器android系统版本：，4.2.2
手机型号：，HUAWEI P6-T00
UID:,10110
时间,应用占用内存PSS（MB）,应用占用内存比（%）,机器生育内存（MB),应用占用CPU率（%）,CPU总使用率（%）,流量（KB）:
2014-04-04 11:27:27,31.42,1.86,474.89,13.84,50.54,31
2014-04-04 11:27:32,30.15,1.78,471.72,10.96,56.91,31
2014-04-04 11:27:37,30.26,1.79,470.36,9.41,38.51,31
2014-04-04 11:27:42,30.32,1.80,471.12,10.07,48.99,31
2014-04-04 11:27:48,48.87,2.89,453.37,7.84,49.52,2392
2014-04-04 11:27:53,51.76,3.06,446.02,12.12,67.07,4139
2014-04-04 11:27:58,52.30,3.10,446.34,14.17,54.50,5773
2014-04-04 11:28:03,49.92,2.96,449.43,12.19,61.66,6957
2014-04-04 11:28:08,50.43,2.99,444.63,13.81,52.81,8250
2014-04-04 11:28:13,51.06,3.02,444.37,12.86,47.46,9129
2014-04-04 11:28:19,51.69,3.06,440.32,10.16,47.41,9883
2014-04-04 11:28:24,52.04,3.08,440.11,11.96,49.65,10522
2014-04-04 11:28:29,52.46,3.11,440.02,16.06,57.51,11370
2014-04-04 11:28:34,52.74,3.12,436.91,8.69,36.39,11751
2014-04-04 11:28:39,53.23,3.15,425.54,12.01,61.19,12363
2014-04-04 11:28:44,53.61,3.17,428.16,11.49,55.12,13084
2014-04-04 11:28:50,53.64,3.18,431.82,12.56,56.89,13212
2014-04-04 11:28:55,53.67,3.18,442.02,12.92,57.62,13340
2014-04-04 11:29:00,53.72,3.18,437.51,6.94,18.74,13468
2014-04-04 11:29:05,53.80,3.18,435.69,12.97,36.26,13628
2014-04-04 11:29:10,49.04,2.90,453.69,15.49,44.20,13719
指定应用的CPU内存监控情况
应用包名：，com.youku.phone
应用名称：优酷
应用PID:,18070
机器内存大小（MB）:,1,689.18MB
机器CPU型号：， ARMv7 Processor rev 0 (v7l)
机器android系统版本：，4.2.2
手机型号：，HUAWEI P6-T00
UID:,10138
时间,应用占用内存PSS（MB）,应用占用内存比（%）,机器生育内存（MB),应用占用CPU率（%）,CPU总使用率（%）,流量（KB）:
2014-04-04 11:22:44,38.32,2.27,571.12,14.44,49.33,27
2014-04-04 11:22:49,49.44,2.93,562.70,17.85,59.39,99
2014-04-04 11:22:54,46.34,2.74,564.27,5.22,52.61,99
2014-04-04 11:22:59,49.23,2.91,564.98,5.41,32.41,109
2014-04-04 11:23:04,58.38,3.46,554.96,22.86,59.31,973
2014-04-04 11:23:10,64.96,3.85,542.30,12.36,50.58,1395
2014-04-04 11:23:15,75.75,4.48,518.93,11.59,45.92,1491
2014-04-04 11:23:20,92.52,5.48,493.89,18.81,64.66,2685
2014-04-04 11:23:25,93.94,5.56,492.57,17.15,49.81,3861
2014-04-04 11:23:30,88.52,5.24,505.85,13.33,46.78,4350
2014-04-04 11:23:35,82.32,4.87,515.14,7.93,53.74,4433
2014-04-04 11:23:41,90.67,5.37,500.58,11.04,39.80,5083
2014-04-04 11:23:46,95.22,5.64,493.45,13.51,53.63,5725
2014-04-04 11:23:51,94.05,5.57,495.05,12.28,56.82,6123
2014-04-04 11:23:56,108.00,6.39,484.68,11.86,38.52,6321
2014-04-04 11:24:01,115.18,6.82,470.41,15.79,50.63,6833
2014-04-04 11:24:06,120.09,7.11,464.73,13.10,49.90,7071
2014-04-04 11:24:12,120.21,7.12,473.17,14.03,53.24,7072
2014-04-04 11:24:17,123.25,7.30,454.29,15.85,48.95,9664
2014-04-04 11:24:22,120.59,7.14,456.04,28.85,66.60,12457
2014-04-04 11:24:27,121.39,7.19,452.71,14.60,49.59,12735
2014-04-04 11:24:32,122.78,7.27,449.92,17.45,54.47,13599
2014-04-04 11:24:38,123.58,7.32,446.69,19.18,56.06,14392
2014-04-04 11:24:43,123.65,7.32,446.61,15.99,51.93,14692
2014-04-04 11:24:48,123.79,7.33,445.80,10.00,45.35,14986
2014-04-04 11:24:53,124.86,7.39,443.32,18.03,56.39,16183
2014-04-04 11:24:59,124.64,7.38,442.50,18.06,60.25,17402
2014-04-04 11:25:04,119.85,7.10,474.79,13.12,51.44,17720
2014-04-04 11:25:09,124.86,7.39,456.52,15.07,64.05,19580
2014-04-04 11:25:14,125.32,7.42,428.92,13.80,50.22,22310
2014-04-04 11:25:20,124.43,7.37,451.03,10.93,65.65,23011
指定应用的CPU内存监控情况
应用包名：，com.Android56
应用名称：56视频
应用PID:,15063
机器内存大小（MB）:,1,689.18MB
机器CPU型号：， ARMv7 Processor rev 0 (v7l)
机器android系统版本：，4.2.2
手机型号：，HUAWEI P6-T00
UID:,10108
时间,应用占用内存PSS（MB）,应用占用内存比（%）,机器生育内存（MB),应用占用CPU率（%）,CPU总使用率（%）,流量（KB）:
2014-04-04 11:18:14,61.46,3.64,742.31,13.47,58.80,13
2014-04-04 11:18:19,64.18,3.80,733.48,6.30,46.67,13
2014-04-04 11:18:24,62.03,3.67,734.39,29.28,60.85,13
2014-04-04 11:18:29,65.37,3.87,729.37,29.53,70.13,13
2014-04-04 11:18:34,58.83,3.48,734.09,17.75,63.81,13
2014-04-04 11:18:40,62.62,3.71,731.62,19.94,61.48,13
2014-04-04 11:18:45,62.62,3.71,725.04,3.89,39.29,13
2014-04-04 11:18:50,68.69,4.07,717.23,12.01,52.71,394
2014-04-04 11:18:55,68.67,4.07,712.55,8.28,58.23,394
2014-04-04 11:19:00,62.29,3.69,721.31,6.22,62.56,406
2014-04-04 11:19:05,55.27,3.27,732.48,19.75,71.01,494
2014-04-04 11:19:11,58.46,3.46,726.55,10.43,35.48,494
2014-04-04 11:19:16,58.57,3.47,723.28,14.89,58.35,494
2014-04-04 11:19:21,58.57,3.47,722.06,15.89,54.90,494
2014-04-04 11:19:26,58.57,3.47,715.50,19.06,66.99,494
2014-04-04 11:19:31,58.67,3.47,711.56,1.61,58.61,494
2014-04-04 11:19:36,58.70,3.47,707.75,0.53,36.00,494
2014-04-04 11:19:42,58.72,3.48,706.59,1.30,51.30,494
2014-04-04 11:19:47,58.75,3.48,706.46,2.39,44.54,494
2014-04-04 11:19:52,58.97,3.49,704.41,8.17,52.95,494
2014-04-04 11:19:57,58.99,3.49,702.49,3.18,54.41,494
2014-04-04 11:20:02,59.15,3.50,702.52,5.02,24.71,494
2014-04-04 11:20:07,59.16,3.50,700.56,2.41,47.98,494
2014-04-04 11:20:13,59.35,3.51,699.67,13.13,70.25,494
2014-04-04 11:20:18,59.42,3.52,702.00,5.89,63.08,494
2014-04-04 11:20:23,59.45,3.52,702.32,4.45,60.69,494
2014-04-04 11:20:28,59.55,3.53,701.48,4.49,60.26,494
2014-04-04 11:20:33,59.61,3.53,698.12,3.44,66.71,494
2014-04-04 11:20:38,59.75,3.54,689.97,8.16,70.74,494
2014-04-04 11:20:43,59.88,3.54,685.29,1.39,25.86,494
2014-04-04 11:20:49,59.91,3.55,686.16,3.31,53.50,494
2014-04-04 11:20:54,59.98,3.55,681.24,6.12,70.31,494
2014-04-04 11:20:59,60.01,3.55,685.57,2.83,63.94,494
2014-04-04 11:21:04,60.10,3.56,690.70,4.46,51.45,494
2014-04-04 11:21:09,60.16,3.56,686.33,4.12,57.35,494
2014-04-04 11:21:14,60.28,3.57,685.66,7.90,59.39,494
2014-04-04 11:21:19,60.30,3.57,687.45,1.63,51.53,494
2014-04-04 11:21:25,60.32,3.57,654.63,1.10,62.17,494
2014-04-04 11:21:30,63.03,3.73,649.36,5.75,41.90,501
2014-04-04 11:21:35,62.59,3.71,646.63,1.80,69.18,501
2014-04-04 11:21:41,62.65,3.71,648.76,2.48,62.96,501
2014-04-04 11:21:46,70.08,4.15,639.98,11.96,54.97,513
