Androidソフトウェアプラットフォーム開発への取組み

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1 Android Development Approaches to Android Software Platform 本田亮 小林誠 南雲正彦 川勝保博 あらまし Android Apple iphone Android Android WiMAX LTE FeliCa REGZA Phone T-01C Android Android Mobile REGZA Engine DLNA AV Abstract Android smartphones first appeared on the market in October 2008 and overtook Apple s iphone, the early market leader, to obtain the largest market share of the smartphone market, bringing large changes to the way people use cell phones. Android is developed and distributed as open-source software. And device vendors integrate it and original features into their hardware. The Android platform is still rapidly growing along with fast advances in hardware specifications. In addition, high-speed network infrastructure service (WiMAX, LTE) was launched in Therefore the ways smartphones are used and services for them are drastically expanding. In December 2010, Fujitsu released its REGZA Phone T-01C based on the Android platform with Japanese features (waterproof, receiver for one-segment broadcasting, FeliCa, and infrared communication). Since then, we have been developing Android smartphones with not only new features but also improved user-friendliness. This paper presents our efforts and technologies to ensure stability and power-saving, which have been important system design items, manner mode for user-friendliness, high-quality picture technology with Mobile REGZA Engine, and technology to connect to AV electrical appliances with DLNA. FUJITSU. 63, 5, p ,

2 まえがき 7 6 プ Google Open Handset Alliance OHA Android Android Linux Android HTC-Dream HTC T-Mobile Apple iphone1 4 Android Microsoft Windows Phone Apple iphone Google Google Play Linux 2300 BSP Board Support Package Android HTC-Dream 528 MHzCPU 3 1 GHzCPU 5 RAM 1 G 6 HD 図 FeliCa REGZA Phone T-01C UI CPU LTE WiMAX DLNA AV HTC Dream ア Android Nexus One ア Android Nexus S ア AV Galaxy Nexus ア ア Android CPU RAM ッ -1 Android システムプラットフォーム技術 592 FUJITSU. 63, 5 09, 2012

3 メモリ管理 REGZA Phone T-01C F-12C ARROWS F-07D ARROWS X LTE F-05D REGZA Phone T-02D RAM 図 -2 REGZA Phone T-02D 1 G Android Android LMK Low Memory Killer -2 Android LMKDalvik Heap MAX_HIDDEN_APPS 3 図 -3 1 LMK LMK Android LMK 2 Dalvik Heap 1 Android 4.0 Ice Cream Sandwich GrowthLimit Dalvik Heap GrowthLimit アプ の RAM ラ 取 OOMK 発 M ト Android 2.1 REGZA Phone T-01C F-12C ARROWS µ F-07D ARROWS X LTE F-05D -2 Android 4.0 REGZA Phone T-02D Low Memory Killer LMK 小 発 Out Of Memory Killer OOMK 保 発 MAX_HIDDEN_APPS am_killer ッ ラウ 発 -3 Android FUJITSU. 63, 5 09,

4 3 MAX_HIDDEN_APPS MAX_HIDDEN_APPS am_killer Linux Out Of Memory Killer OOMK OOMK OOMK Android OOMK LMK Dalvik Heap MAX_HIDDEN_ APPS AndroidLinux 消費電流管理 2012 CPU 1 GHz CPU CPU CPU CPU 2 アプリケーションフレームワーク技術 Android 2012 省電力技術 ( エコ機能 ) 2012 NX! Wi-Fi GPS Bluetooth NX! 図 -4 / 594 FUJITSU. 63, 5 09, 2012

5 Android NX! マーエコモード 電 エコモード つのエコレ ル すぐエコモード NX! Android 4.0 表 -1 SNS ma 25 ma 20 ma 16 ma 16 ma 19 ma 53% 36% 5% Android 利便性向上技術 ( マナーモード ) Android ON/OFF ON/OFF Bluetooth Android 2012 SNS FUJITSU. 63, 5 09,

6 ON ON Android マルチメディア技術 WiMAX LTE Wi-Fi DLNA HDMI AV REGZA Phone T-01C Mobile REGZA Engine 3.0 Android 2012 REGZA Phone T-02DMobile REGZA Engine 6.0 AVDLNA 高画質化技術 (Mobile REGZA Engineの搭載 ) Mobile REGZA Engine 表 -2 REGZA Phone T-02D Mobile REGZA Engine Mobile REGZA Engine D 2D 3D 3D 2D 2D 3D 3D AV 機器連携技術 (DLNA 機能の搭載 ) ARROWS Tab LTE F-01D DLNA DTCP-IPWi-Fi TV F-01D Android 3.0 AV MPEG-2 DTCP-IP 2011 REGZA Phone T-01D 720p AV 2012 REGZA Phone T-02D AV むすび Android 596 FUJITSU. 63, 5 09, 2012

7 AV Apple iphone Android PC 24 NTT 著者紹介 本田亮 ( ほんだまこと ) 南雲正彦 ( なぐもまさひこ ) 小林誠 ( こばやしまこと ) 川勝保博 ( かわかつやすひろ ) FUJITSU. 63, 5 09,

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