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 Android教程網 >> Android系統教程 >> Android開發教程 >> Android照片牆應用實現，再多的圖片也不怕崩潰

Android照片牆應用實現，再多的圖片也不怕崩潰

編輯：Android開發教程

照片牆這種功能現在應該算是挺常見了，在很多應用中你都可以經常看到照片牆的身影。它的設計思路其 實也非常簡單，用一個GridView控件當作“牆”，然後隨著GridView的滾動將一張張照片貼在“牆”上，這 些照片可以是手機本地中存儲的，也可以是從網上下載的。制作類似於這種的功能的應用，有一個非常重要 的問題需要考慮，就是圖片資源何時應該釋放。因為隨著GridView的滾動，加載的圖片可能會越來越多，如 果沒有一種合理的機制對圖片進行釋放，那麼當圖片達到一定上限時，程序就必然會崩潰。

今天我們 照片牆應用的實現，重點也是放在了如何防止由於圖片過多導致程序崩潰上面。主要的核心算法使用了 Android中提供的LruCache類，這個類是3.1版本中提供的，如果你是在更早的Android版本中開發，則需要導 入android-support-v4的jar包。

關於LruCache用法的詳細講解，可以參考Android高效加載大圖、多 圖方案，有效避免程序OOM。

那我們開始動手吧，新建一個Android項目，起名叫PhotoWallDemo，這 裡我使用的是Android 4.0的API。

第一個要考慮的問題就是，我們從哪兒去收集這麼多的圖片呢？這 裡我從谷歌官方提供的Demo裡將圖片源取了出來，我們就從這些網址中下載圖片，代碼如下所示：

public class Images {  
      
    public final static String[] imageThumbUrls = new String[] {  
            "https://lh6.googleusercontent.com/-

55osAWw3x0Q/URquUtcFr5I/AAAAAAAAAbs/rWlj1RUKrYI/s160-c/A%252520Photographer.jpg",  
            "https://lh4.googleusercontent.com/--dq8niRp7W4/URquVgmXvgI/AAAAAAAAAbs/-

gnuLQfNnBA/s160-c/A%252520Song%252520of%252520Ice%252520and%252520Fire.jpg",  
            "https://lh5.googleusercontent.com/-

7qZeDtRKFKc/URquWZT1gOI/AAAAAAAAAbs/hqWgteyNXsg/s160-c/Another%252520Rockaway%

252520Sunset.jpg",  
            "https://lh3.googleusercontent.com/--

L0Km39l5J8/URquXHGcdNI/AAAAAAAAAbs/3ZrSJNrSomQ/s160-c/Antelope%252520Butte.jpg",  
            "https://lh6.googleusercontent.com/-8HO-

4vIFnlw/URquZnsFgtI/AAAAAAAAAbs/WT8jViTF7vw/s160-c/Antelope%252520Hallway.jpg",  
            "https://lh4.googleusercontent.com/-

WIuWgVcU3Qw/URqubRVcj4I/AAAAAAAAAbs/YvbwgGjwdIQ/s160-c/Antelope%252520Walls.jpg",  
            "https://lh6.googleusercontent.com/-

UBmLbPELvoQ/URqucCdv0kI/AAAAAAAAAbs/IdNhr2VQoQs/s160-c/Apre%2525CC%252580s%252520la%

252520Pluie.jpg",  
            "https://lh3.googleusercontent.com/-s-AFpvgSeew/URquc6dF-

JI/AAAAAAAAAbs/Mt3xNGRUd68/s160-c/Backlit%252520Cloud.jpg",  
            "https://lh5.googleusercontent.com/-

bvmif9a9YOQ/URquea3heHI/AAAAAAAAAbs/rcr6wyeQtAo/s160-c/Bee%252520and%252520Flower.jpg",  
            "https://lh5.googleusercontent.com/-n7mdm7I7FGs/URqueT_BT-

I/AAAAAAAAAbs/9MYmXlmpSAo/s160-c/Bonzai%252520Rock%252520Sunset.jpg",  
            "https://lh6.googleusercontent.com/-

4CN4X4t0M1k/URqufPozWzI/AAAAAAAAAbs/8wK41lg1KPs/s160-c/Caterpillar.jpg",  
            "https://lh3.googleusercontent.com/-

rrFnVC8xQEg/URqufdrLBaI/AAAAAAAAAbs/s69WYy_fl1E/s160-c/Chess.jpg",  
            "https://lh5.googleusercontent.com/-WVpRptWH8Yw/URqugh-QmDI/AAAAAAAAAbs/E-

MgBgtlUWU/s160-c/Chihuly.jpg",  
            "https://lh5.googleusercontent.com/-

0BDXkYmckbo/URquhKFW84I/AAAAAAAAAbs/ogQtHCTk2JQ/s160-c/Closed%252520Door.jpg",  
            "https://lh3.googleusercontent.com/-PyggXXZRykM/URquh-

kVvoI/AAAAAAAAAbs/hFtDwhtrHHQ/s160-c/Colorado%252520River%252520Sunset.jpg",  
            "https://lh3.googleusercontent.com/-

ZAs4dNZtALc/URquikvOCWI/AAAAAAAAAbs/DXz4h3dll1Y/s160-c/Colors%252520of%252520Autumn.jpg",  
            "https://lh4.googleusercontent.com/-

GztnWEIiMz8/URqukVCU7bI/AAAAAAAAAbs/jo2Hjv6MZ6M/s160-c/Countryside.jpg",  
            "https://lh4.googleusercontent.com/-

bEg9EZ9QoiM/URquklz3FGI/AAAAAAAAAbs/UUuv8Ac2BaE/s160-c/Death%252520Valley%252520-%

252520Dunes.jpg",  
            "https://lh6.googleusercontent.com/-

ijQJ8W68tEE/URqulGkvFEI/AAAAAAAAAbs/zPXvIwi_rFw/s160-c/Delicate%252520Arch.jpg",  
            "https://lh5.googleusercontent.com/-

Oh8mMy2ieng/URqullDwehI/AAAAAAAAAbs/TbdeEfsaIZY/s160-c/Despair.jpg",  
            "https://lh5.googleusercontent.com/-

gl0y4UiAOlk/URqumC_KjBI/AAAAAAAAAbs/PM1eT7dn4oo/s160-c/Eagle%252520Fall%252520Sunrise.jpg",  
            "https://lh3.googleusercontent.com/-

hYYHd2_vXPQ/URqumtJa9eI/AAAAAAAAAbs/wAalXVkbSh0/s160-c/Electric%252520Storm.jpg",  
            "https://lh5.googleusercontent.com/-

PyY_yiyjPTo/URqunUOhHFI/AAAAAAAAAbs/azZoULNuJXc/s160-c/False%252520Kiva.jpg",  
            "https://lh6.googleusercontent.com/-

PYvLVdvXywk/URqunwd8hfI/AAAAAAAAAbs/qiMwgkFvf6I/s160-c/Fitzgerald%252520Streaks.jpg",  
            "https://lh4.googleusercontent.com/-

KIR_UobIIqY/URquoCZ9SlI/AAAAAAAAAbs/Y4d4q8sXu4c/s160-c/Foggy%252520Sunset.jpg",  
            "https://lh6.googleusercontent.com/-

9lzOk_OWZH0/URquoo4xYoI/AAAAAAAAAbs/AwgzHtNVCwU/s160-c/Frantic.jpg",  
            "https://lh3.googleusercontent.com/-

0X3JNaKaz48/URqupH78wpI/AAAAAAAAAbs/lHXxu_zbH8s/s160-c/Golden%252520Gate%252520Afternoon.jpg",  
            "https://lh6.googleusercontent.com/-

95sb5ag7ABc/URqupl95RDI/AAAAAAAAAbs/g73R20iVTRA/s160-c/Golden%252520Gate%252520Fog.jpg",  
            "https://lh3.googleusercontent.com/-JB9v6rtgHhk/URqup21F-

zI/AAAAAAAAAbs/64Fb8qMZWXk/s160-c/Golden%252520Grass.jpg",  
            "https://lh4.googleusercontent.com/-

EIBGfnuLtII/URquqVHwaRI/AAAAAAAAAbs/FA4McV2u8VE/s160-c/Grand%252520Teton.jpg",  
            "https://lh4.googleusercontent.com/-

WoMxZvmN9nY/URquq1v2AoI/AAAAAAAAAbs/grj5uMhL6NA/s160-c/Grass%252520Closeup.jpg",  
            "https://lh3.googleusercontent.com/-

6hZiEHXx64Q/URqurxvNdqI/AAAAAAAAAbs/kWMXM3o5OVI/s160-c/Green%252520Grass.jpg",  
            "https://lh5.googleusercontent.com/-

6LVb9OXtQ60/URquteBFuKI/AAAAAAAAAbs/4F4kRgecwFs/s160-c/Hanging%252520Leaf.jpg",  
            "https://lh4.googleusercontent.com/-

zAvf__52ONk/URqutT_IuxI/AAAAAAAAAbs/D_bcuc0thoU/s160-c/Highway%2525201.jpg",  
            "https://lh6.googleusercontent.com/-

H4SrUg615rA/URquuL27fXI/AAAAAAAAAbs/4aEqJfiMsOU/s160-c/Horseshoe%252520Bend%252520Sunset.jpg",  
            "https://lh4.googleusercontent.com/-JhFi4fb_Pqw/URquuX-

QXbI/AAAAAAAAAbs/IXpYUxuweYM/s160-c/Horseshoe%252520Bend.jpg",  
            "https://lh5.googleusercontent.com/-

UGgssvFRJ7g/URquueyJzGI/AAAAAAAAAbs/yYIBlLT0toM/s160-c/Into%252520the%252520Blue.jpg",  
            "https://lh3.googleusercontent.com/-

CH7KoupI7uI/URquu0FF__I/AAAAAAAAAbs/R7GDmI7v_G0/s160-c/Jelly%252520Fish%2525202.jpg",  
            "https://lh4.googleusercontent.com/-pwuuw6yhg8U/URquvPxR3FI/AAAAAAAAAbs/VNGk6f-

tsGE/s160-c/Jelly%252520Fish%2525203.jpg",  
            "https://lh5.googleusercontent.com/-

GoUQVw1fnFw/URquv6xbC0I/AAAAAAAAAbs/zEUVTQQ43Zc/s160-c/Kauai.jpg",  
            "https://lh6.googleusercontent.com/-8QdYYQEpYjw/URquwvdh88I/AAAAAAAAAbs/cktDy-

ysfHo/s160-c/Kyoto%252520Sunset.jpg",  
            "https://lh4.googleusercontent.com/-

vPeekyDjOE0/URquwzJ28qI/AAAAAAAAAbs/qxcyXULsZrg/s160-c/Lake%252520Tahoe%252520Colors.jpg",  
            "https://lh4.googleusercontent.com/-

xBPxWpD4yxU/URquxWHk8AI/AAAAAAAAAbs/ARDPeDYPiMY/s160-c/Lava%252520from%252520the%

252520Sky.jpg",  
            "https://lh3.googleusercontent.com/-897VXrJB6RE/URquxxxd-5I/AAAAAAAAAbs/j-

Cz4T4YvIw/s160-c/Leica%25252050mm%252520Summilux.jpg",  
            "https://lh5.googleusercontent.com/-

qSJ4D4iXzGo/URquyDWiJ1I/AAAAAAAAAbs/k2pBXeWehOA/s160-c/Leica%25252050mm%252520Summilux.jpg",  
            "https://lh6.googleusercontent.com/-

dwlPg83vzLg/URquylTVuFI/AAAAAAAAAbs/G6SyQ8b4YsI/s160-c/Leica%252520M8%252520%252528Front%

252529.jpg",  
            "https://lh3.googleusercontent.com/-

R3_EYAyJvfk/URquzQBv8eI/AAAAAAAAAbs/b9xhpUM3pEI/s160-c/Light%252520to%252520Sand.jpg",  
            "https://lh3.googleusercontent.com/-

fHY5h67QPi0/URqu0Cp4J1I/AAAAAAAAAbs/0lG6m94Z6vM/s160-c/Little%252520Bit%252520of%

252520Paradise.jpg",  
            "https://lh5.googleusercontent.com/-

TzF_LwrCnRM/URqu0RddPOI/AAAAAAAAAbs/gaj2dLiuX0s/s160-c/Lone%252520Pine%252520Sunset.jpg",  
            "https://lh3.googleusercontent.com/-

4HdpJ4_DXU4/URqu046dJ9I/AAAAAAAAAbs/eBOodtk2_uk/s160-c/Lonely%252520Rock.jpg",  
            "https://lh6.googleusercontent.com/-erbF--z-

W4s/URqu1ajSLkI/AAAAAAAAAbs/xjDCDO1INzM/s160-c/Longue%252520Vue.jpg",  
            "https://lh6.googleusercontent.com/-

0CXJRdJaqvc/URqu1opNZNI/AAAAAAAAAbs/PFB2oPUU7Lk/s160-c/Look%252520Me%252520in%252520the%

252520Eye.jpg",  
            "https://lh3.googleusercontent.com/-

D_5lNxnDN6g/URqu2Tk7HVI/AAAAAAAAAbs/p0ddca9W__Y/s160-c/Lost%252520in%252520a%252520Field.jpg",  
            "https://lh6.googleusercontent.com/-

flsqwMrIk2Q/URqu24PcmjI/AAAAAAAAAbs/5ocIH85XofM/s160-c/Marshall%252520Beach%252520Sunset.jpg",  
            "https://lh4.googleusercontent.com/-

Y4lgryEVTmU/URqu28kG3gI/AAAAAAAAAbs/OjXpekqtbJ4/s160-c/Mono%252520Lake%252520Blue.jpg",  
            "https://lh4.googleusercontent.com/-

AaHAJPmcGYA/URqu3PIldHI/AAAAAAAAAbs/lcTqk1SIcRs/s160-c/Monument%252520Valley%

252520Overlook.jpg",  
            "https://lh4.googleusercontent.com/-

vKxfdQ83dQA/URqu31Yq_BI/AAAAAAAAAbs/OUoGk_2AyfM/s160-c/Moving%252520Rock.jpg",  
            "https://lh5.googleusercontent.com/-

CG62QiPpWXg/URqu4ia4vRI/AAAAAAAAAbs/0YOdqLAlcAc/s160-c/Napali%252520Coast.jpg",  
            "https://lh6.googleusercontent.com/-

wdGrP5PMmJQ/URqu5PZvn7I/AAAAAAAAAbs/m0abEcdPXe4/s160-c/One%252520Wheel.jpg",  
            "https://lh6.googleusercontent.com/-

6WS5DoCGuOA/URqu5qx1UgI/AAAAAAAAAbs/giMw2ixPvrY/s160-c/Open%252520Sky.jpg",  
            "https://lh6.googleusercontent.com/-

u8EHKj8G8GQ/URqu55sM6yI/AAAAAAAAAbs/lIXX_GlTdmI/s160-c/Orange%252520Sunset.jpg",  
            "https://lh6.googleusercontent.com/-

74Z5qj4bTDE/URqu6LSrJrI/AAAAAAAAAbs/XzmVkw90szQ/s160-c/Orchid.jpg",  
            "https://lh6.googleusercontent.com/-

lEQE4h6TePE/URqu6t_lSkI/AAAAAAAAAbs/zvGYKOea_qY/s160-c/Over%252520there.jpg",  
            "https://lh5.googleusercontent.com/-cauH-

53JH2M/URqu66v_USI/AAAAAAAAAbs/EucwwqclfKQ/s160-c/Plumes.jpg",  
            "https://lh3.googleusercontent.com/-eDLT2jHDoy4/URqu7axzkAI/AAAAAAAAAbs/iVZE-

xJ7lZs/s160-c/Rainbokeh.jpg",  
            "https://lh5.googleusercontent.com/-

j1NLqEFIyco/URqu8L1CGcI/AAAAAAAAAbs/aqZkgX66zlI/s160-c/Rainbow.jpg",  
            "https://lh5.googleusercontent.com/-

DRnqmK0t4VU/URqu8XYN9yI/AAAAAAAAAbs/LgvF_592WLU/s160-c/Rice%252520Fields.jpg",  
            "https://lh3.googleusercontent.com/-

hwh1v3EOGcQ/URqu8qOaKwI/AAAAAAAAAbs/IljRJRnbJGw/s160-c/Rockaway%252520Fire%252520Sky.jpg",  
            "https://lh5.googleusercontent.com/-wjV6FQk7tlk/URqu9jCQ8sI/AAAAAAAAAbs/RyYUpdo-

c9o/s160-c/Rockaway%252520Flow.jpg",  
            "https://lh6.googleusercontent.com/-6cAXNfo7D20/URqu-

BdzgPI/AAAAAAAAAbs/OmsYllzJqwo/s160-c/Rockaway%252520Sunset%252520Sky.jpg",  
            "https://lh3.googleusercontent.com/-sl8fpGPS-RE/URqu_BOkfgI/AAAAAAAAAbs/Dg2Fv-

JxOeg/s160-c/Russian%252520Ridge%252520Sunset.jpg",  
            "https://lh6.googleusercontent.com/-

gVtY36mMBIg/URqu_q91lkI/AAAAAAAAAbs/3CiFMBcy5MA/s160-c/Rust%252520Knot.jpg",  
            "https://lh6.googleusercontent.com/-

GHeImuHqJBE/URqu_FKfVLI/AAAAAAAAAbs/axuEJeqam7Q/s160-c/Sailing%252520Stones.jpg",  
            "https://lh3.googleusercontent.com/-

hBbYZjTOwGc/URqu_ycpIrI/AAAAAAAAAbs/nAdJUXnGJYE/s160-c/Seahorse.jpg",  
            "https://lh3.googleusercontent.com/-Iwi6-

i6IexY/URqvAYZHsVI/AAAAAAAAAbs/5ETWl4qXsFE/s160-c/Shinjuku%252520Street.jpg",  
            "https://lh6.googleusercontent.com/-

amhnySTM_MY/URqvAlb5KoI/AAAAAAAAAbs/pFCFgzlKsn0/s160-c/Sierra%252520Heavens.jpg",  
            "https://lh5.googleusercontent.com/-dJgjepFrYSo/URqvBVJZrAI/AAAAAAAAAbs/v-

F5QWpYO6s/s160-c/Sierra%252520Sunset.jpg",  
            "https://lh4.googleusercontent.com/-

Z4zGiC5nWdc/URqvBdEwivI/AAAAAAAAAbs/ZRZR1VJ84QA/s160-c/Sin%252520Lights.jpg",  
            "https://lh4.googleusercontent.com/-

_0cYiWW8ccY/URqvBz3iM4I/AAAAAAAAAbs/9N_Wq8MhLTY/s160-c/Starry%252520Lake.jpg",  
            "https://lh3.googleusercontent.com/-

A9LMoRyuQUA/URqvCYx_JoI/AAAAAAAAAbs/s7sde1Bz9cI/s160-c/Starry%252520Night.jpg",  
            "https://lh3.googleusercontent.com/-

KtLJ3k858eY/URqvC_2h_bI/AAAAAAAAAbs/zzEBImwDA_g/s160-c/Stream.jpg",  
            "https://lh5.googleusercontent.com/-

dFB7Lad6RcA/URqvDUftwWI/AAAAAAAAAbs/BrhoUtXTN7o/s160-c/Strip%252520Sunset.jpg",  
            "https://lh5.googleusercontent.com/-

at6apgFiN20/URqvDyffUZI/AAAAAAAAAbs/clABCx171bE/s160-c/Sunset%252520Hills.jpg",  
            "https://lh4.googleusercontent.com/-7-

EHhtQthII/URqvEYTk4vI/AAAAAAAAAbs/QSJZoB3YjVg/s160-c/Tenaya%252520Lake%2525202.jpg",  
            "https://lh6.googleusercontent.com/-8MrjV_a-

Pok/URqvFC5repI/AAAAAAAAAbs/9inKTg9fbCE/s160-c/Tenaya%252520Lake.jpg",  
            "https://lh5.googleusercontent.com/-B1HW-

z4zwao/URqvFWYRwUI/AAAAAAAAAbs/8Peli53Bs8I/s160-c/The%252520Cave%252520BW.jpg",  
            "https://lh3.googleusercontent.com/-PO4E-

xZKAnQ/URqvGRqjYkI/AAAAAAAAAbs/42nyADFsXag/s160-c/The%252520Fisherman.jpg",  
            "https://lh4.googleusercontent.com/-

iLyZlzfdy7s/URqvG0YScdI/AAAAAAAAAbs/1J9eDKmkXtk/s160-c/The%252520Night%252520is%

252520Coming.jpg",  
            "https://lh6.googleusercontent.com/-G-

k7YkkUco0/URqvHhah6fI/AAAAAAAAAbs/_taQQG7t0vo/s160-c/The%252520Road.jpg",  
            "https://lh6.googleusercontent.com/-h-

ALJt7kSus/URqvIThqYfI/AAAAAAAAAbs/ejiv35olWS8/s160-c/Tokyo%252520Heights.jpg",  
            "https://lh5.googleusercontent.com/-Hy9k-

TbS7xg/URqvIjQMOxI/AAAAAAAAAbs/RSpmmOATSkg/s160-c/Tokyo%252520Highway.jpg",  
            "https://lh6.googleusercontent.com/-

83oOvMb4OZs/URqvJL0T7lI/AAAAAAAAAbs/c5TECZ6RONM/s160-c/Tokyo%252520Smog.jpg",  
            "https://lh3.googleusercontent.com/-FB-

jfgREEfI/URqvJI3EXAI/AAAAAAAAAbs/XfyweiRF4v8/s160-c/Tufa%252520at%252520Night.jpg",  
            "https://lh4.googleusercontent.com/-

vngKD5Z1U8w/URqvJUCEgPI/AAAAAAAAAbs/ulxCMVcU6EU/s160-c/Valley%252520Sunset.jpg",  
            "https://lh6.googleusercontent.com/-

DOz5I2E2oMQ/URqvKMND1kI/AAAAAAAAAbs/Iqf0IsInleo/s160-c/Windmill%252520Sunrise.jpg",  
            "https://lh5.googleusercontent.com/-

biyiyWcJ9MU/URqvKculiAI/AAAAAAAAAbs/jyPsCplJOpE/s160-c/Windmill.jpg",  
            "https://lh4.googleusercontent.com/-

PDT167_xRdA/URqvK36mLcI/AAAAAAAAAbs/oi2ik9QseMI/s160-c/Windmills.jpg",  
            "https://lh5.googleusercontent.com/-

kI_QdYx7VlU/URqvLXCB6gI/AAAAAAAAAbs/N31vlZ6u89o/s160-c/Yet%252520Another%252520Rockaway%

252520Sunset.jpg",  
            "https://lh4.googleusercontent.com/-

e9NHZ5k5MSs/URqvMIBZjtI/AAAAAAAAAbs/1fV810rDNfQ/s160-c/Yosemite%252520Tree.jpg", };  
}

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