{"id":203627,"date":"2023-08-12T13:48:53","date_gmt":"2023-08-12T05:48:53","guid":{"rendered":"https:\/\/www.idc.net\/help\/203627\/"},"modified":"2023-08-12T13:48:53","modified_gmt":"2023-08-12T05:48:53","slug":"android-lrucache%e7%bc%93%e5%ad%98%e7%ad%96%e7%95%a5","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/203627\/","title":{"rendered":"Android | LruCache\u7f13\u5b58\u7b56\u7565"},"content":{"rendered":"

LruCache\u4ecb\u7ecd<\/span><\/h3>\n

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LruCache\u7684\u5de5\u4f5c\u539f\u7406\u662f\u901a\u8fc7\u4e00\u4e2a\u53cc\u5411\u94fe\u8868\u548c\u4e00\u4e2a\u54c8\u5e0c\u8868\u6765\u5b9e\u73b0\u7684\u3002\u53cc\u5411\u94fe\u8868\u7528\u4e8e\u6309\u7167\u8bbf\u95ee\u987a\u5e8f\u6765\u5b58\u50a8\u7f13\u5b58\u6570\u636e\uff0c\u6700\u8fd1\u8bbf\u95ee\u7684\u6570\u636e\u4f1a\u88ab\u653e\u5728\u94fe\u8868\u7684\u5934\u90e8\uff0c\u6700\u4e45\u672a\u8bbf\u95ee\u7684\u6570\u636e\u4f1a\u88ab\u653e\u5728\u94fe\u8868\u7684\u5c3e\u90e8\u3002\u54c8\u5e0c\u8868\u7528\u4e8e\u5feb\u901f\u67e5\u627e\u7f13\u5b58\u6570\u636e\u3002<\/p>\n

\u5f53\u9700\u8981\u4eceLruCache\u4e2d\u83b7\u53d6\u6570\u636e\u65f6\uff0cLruCache\u4f1a\u5148\u5728\u54c8\u5e0c\u8868\u4e2d\u67e5\u627e\u5bf9\u5e94\u7684\u7f13\u5b58\u6570\u636e\uff0c\u5982\u679c\u627e\u5230\u4e86\uff0c\u5219\u5c06\u8be5\u6570\u636e\u79fb\u52a8\u5230\u94fe\u8868\u7684\u5934\u90e8\uff0c\u5e76\u8fd4\u56de\u7ed9\u8c03\u7528\u8005\u3002\u5982\u679c\u6ca1\u6709\u627e\u5230\uff0c\u5219\u8fd4\u56denull\u3002<\/p>\n

\u5f53\u9700\u8981\u5411LruCache\u4e2d\u6dfb\u52a0\u6570\u636e\u65f6\uff0cLruCache\u4f1a\u5148\u5224\u65ad\u5f53\u524d\u7f13\u5b58\u7684\u5927\u5c0f\u662f\u5426\u5df2\u7ecf\u8fbe\u5230\u4e86\u8bbe\u5b9a\u7684\u6700\u5927\u503c\uff0c\u5982\u679c\u8fbe\u5230\u4e86\u6700\u5927\u503c\uff0c\u5219\u4f1a\u5c06\u94fe\u8868\u5c3e\u90e8\u7684\u6570\u636e\u5220\u9664\uff0c\u7136\u540e\u518d\u5c06\u65b0\u7684\u6570\u636e\u6dfb\u52a0\u5230\u94fe\u8868\u7684\u5934\u90e8\u548c\u54c8\u5e0c\u8868\u4e2d\u3002\u5982\u679c\u6ca1\u6709\u8fbe\u5230\u6700\u5927\u503c\uff0c\u5219\u76f4\u63a5\u5c06\u65b0\u7684\u6570\u636e\u6dfb\u52a0\u5230\u94fe\u8868\u7684\u5934\u90e8\u548c\u54c8\u5e0c\u8868\u4e2d\u3002<\/p>\n

LruCache\u901a\u8fc7\u4f7f\u7528\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684\u7b56\u7565\u6765\u7ba1\u7406\u7f13\u5b58\u6570\u636e\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002<\/p>\n

LruCache\u4f7f\u7528\u573a\u666f<\/span><\/h3>\n

LruCache\uff08Least Recently Used Cache\uff09\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u7f13\u5b58\u7b56\u7565\uff0c\u5b83\u6839\u636e\u6570\u636e\u7684\u8bbf\u95ee\u987a\u5e8f\u6765\u51b3\u5b9a\u54ea\u4e9b\u6570\u636e\u88ab\u4fdd\u7559\u5728\u7f13\u5b58\u4e2d\uff0c\u54ea\u4e9b\u6570\u636e\u88ab\u6dd8\u6c70\u51fa\u53bb\u3002LruCache\u9002\u7528\u4e8e\u4ee5\u4e0b\u573a\u666f\uff1a<\/p>\n

    \n
  1. \u5185\u5b58\u7f13\u5b58\uff1aLruCache\u53ef\u4ee5\u7528\u4e8e\u5728\u5185\u5b58\u4e2d\u7f13\u5b58\u4e00\u4e9b\u9891\u7e41\u8bbf\u95ee\u7684\u6570\u636e\uff0c\u4f8b\u5982\u56fe\u7247\u3001\u7f51\u7edc\u8bf7\u6c42\u7ed3\u679c\u7b49\u3002\u901a\u8fc7\u9650\u5236\u7f13\u5b58\u7684\u5927\u5c0f\uff0c\u53ef\u4ee5\u907f\u514d<\/span>\u5185\u5b58\u6ea2\u51fa\u7684\u95ee\u9898\u3002<\/span><\/li>\n
  2. \u6570\u636e\u5e93\u67e5\u8be2\u7ed3\u679c\u7f13\u5b58\uff1a\u5f53\u9700\u8981\u9891\u7e41\u67e5\u8be2\u6570\u636e\u5e93\u5e76\u4e14\u67e5\u8be2\u7ed3\u679c\u4e0d\u7ecf\u5e38\u53d8\u5316\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528LruCache\u5c06\u67e5\u8be2\u7ed3\u679c\u7f13\u5b58\u8d77\u6765\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n
  3. \u56fe\u7247\u52a0\u8f7d\uff1a\u5728<\/span>Android\u5f00\u53d1\u4e2d\uff0cLruCache\u5e38\u88ab\u7528\u4e8e\u56fe\u7247\u52a0\u8f7d\u6846\u67b6\u4e2d\uff0c\u53ef\u4ee5\u5c06\u5df2\u7ecf\u52a0\u8f7d\u8fc7\u7684\u56fe\u7247\u7f13\u5b58\u8d77\u6765\uff0c\u907f\u514d\u91cd\u590d\u52a0\u8f7d\u548c\u6d6a\u8d39\u7f51\u7edc\u8d44\u6e90\u3002<\/span><\/li>\n<\/ol>\n

    LruCache\u9002\u7528\u4e8e\u9700\u8981\u7f13\u5b58\u4e00\u4e9b\u9891\u7e41\u8bbf\u95ee\u7684\u6570\u636e\uff0c\u5e76\u4e14\u9700\u8981\u9650\u5236\u7f13\u5b58\u5927\u5c0f\u7684\u573a\u666f\u3002\u5b83\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u8bbf\u95ee\u7684\u901f\u5ea6\u548c\u6027\u80fd\uff0c\u5e76\u4e14\u53ef\u4ee5\u907f\u514d\u5185\u5b58\u6ea2\u51fa\u7684\u95ee\u9898\u3002<\/p>\n

    LruCache\u539f\u7406<\/span><\/h3>\n
      \n
    1. LruCache\u662f\u57fa\u4e8e\u54c8\u5e0c\u8868\u548c\u53cc\u5411\u94fe\u8868\u7684\u6570\u636e\u7ed3\u6784\u3002\u54c8\u5e0c\u8868\u7528\u4e8e\u5feb\u901f\u67e5\u627e\u7f13\u5b58\u4e2d\u7684\u6570\u636e\uff0c\u53cc\u5411\u94fe\u8868\u7528\u4e8e\u7ef4\u62a4\u6570\u636e\u7684\u8bbf\u95ee\u987a\u5e8f\u3002<\/li>\n
    2. \u5f53\u6709\u65b0\u7684\u6570\u636e\u88ab\u8bbf\u95ee\u65f6\uff0cLruCache\u4f1a\u68c0\u67e5\u8be5\u6570\u636e\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u4e8e\u7f13\u5b58\u4e2d\u3002\u5982\u679c\u5b58\u5728\uff0c\u5219\u5c06\u8be5\u6570\u636e\u79fb\u52a8\u5230\u94fe\u8868\u7684\u5934\u90e8\uff0c\u8868\u793a\u6700\u8fd1\u8bbf\u95ee\u8fc7\u3002\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u5c06\u8be5\u6570\u636e\u6dfb\u52a0\u5230\u94fe\u8868\u7684\u5934\u90e8\uff0c\u5e76\u5728\u54c8\u5e0c\u8868\u4e2d\u8bb0\u5f55\u8be5\u6570\u636e\u7684\u4f4d\u7f6e\u3002<\/li>\n
    3. \u5f53\u7f13\u5b58\u8fbe\u5230\u6700\u5927\u5bb9\u91cf\u65f6\uff0c\u9700\u8981\u6dd8\u6c70\u6700\u4e45\u672a\u4f7f\u7528\u7684\u6570\u636e\u3002LruCache\u4f1a\u5c06\u94fe\u8868\u5c3e\u90e8\u7684\u6570\u636e\u79fb\u9664\uff0c\u5e76\u4ece\u54c8\u5e0c\u8868\u4e2d\u5220\u9664\u5bf9\u5e94\u7684\u8bb0\u5f55\u3002<\/li>\n
    4. \u5f53\u6709\u6570\u636e\u88ab\u8bbf\u95ee\u65f6\uff0c\u5982\u679c\u8be5\u6570\u636e\u5df2\u7ecf\u5b58\u5728\u4e8e\u7f13\u5b58\u4e2d\uff0c\u5219\u5c06\u5176\u79fb\u52a8\u5230\u94fe\u8868\u7684\u5934\u90e8\u3002\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u94fe\u8868\u5934\u90e8\u7684\u6570\u636e\u662f\u6700\u8fd1\u8bbf\u95ee\u7684\u6570\u636e\uff0c\u94fe\u8868\u5c3e\u90e8\u7684\u6570\u636e\u662f\u6700\u4e45\u672a\u4f7f\u7528\u7684\u6570\u636e\u3002<\/li>\n<\/ol>\n

      LruCache\u53ef\u4ee5\u5728\u5e38\u6570\u65f6\u95f4\u5185\u5b8c\u6210\u6570\u636e\u7684\u67e5\u627e\u3001\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\uff0c\u4ece\u800c\u63d0\u9ad8\u7f13\u5b58\u7684\u6548\u7387\u3002<\/p>\n

      LruCache\u4f7f\u7528<\/span><\/h3>\n
        \n
      1. \u521b\u5efaLruCache\u5bf9\u8c61\uff1a\u901a\u8fc7<\/span>\u6784\u9020\u51fd\u6570\u521b\u5efa\u4e00\u4e2aLruCache\u5bf9\u8c61\uff0c\u9700\u8981\u6307\u5b9a\u7f13\u5b58\u7684\u6700\u5927\u5bb9\u91cf\u3002<\/span><\/li>\n
      2. \u6dfb\u52a0\u5bf9\u8c61\u5230\u7f13\u5b58\uff1a\u4f7f\u7528put(key, value)\u65b9\u6cd5\u5c06\u5bf9\u8c61\u6dfb\u52a0\u5230\u7f13\u5b58\u4e2d\uff0c\u5176\u4e2dkey\u662f\u5bf9\u8c61\u7684\u552f\u4e00<\/span>\u6807\u8bc6\u7b26\uff0cvalue\u662f\u8981\u7f13\u5b58\u7684\u5bf9\u8c61\u3002<\/span><\/li>\n
      3. \u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u5bf9\u8c61\uff1a\u4f7f\u7528get(key)\u65b9\u6cd5\u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u5bf9\u8c61\uff0c\u5982\u679c\u5bf9\u8c61\u5b58\u5728\uff0c\u5219\u8fd4\u56de\u5bf9\u8c61\uff1b\u5982\u679c\u5bf9\u8c61\u4e0d\u5b58\u5728\uff0c\u5219\u8fd4\u56denull\u3002<\/li>\n
      4. \u4ece\u7f13\u5b58\u4e2d\u79fb\u9664\u5bf9\u8c61\uff1a\u4f7f\u7528remove(key)\u65b9\u6cd5\u4ece\u7f13\u5b58\u4e2d\u79fb\u9664\u6307\u5b9akey\u5bf9\u5e94\u7684\u5bf9\u8c61\u3002<\/li>\n
      5. \u6e05\u7a7a\u7f13\u5b58\uff1a\u4f7f\u7528evictAll()\u65b9\u6cd5\u6e05\u7a7a\u7f13\u5b58\uff0c\u5c06\u6240\u6709\u5bf9\u8c61\u4ece\u7f13\u5b58\u4e2d\u79fb\u9664\u3002<\/li>\n<\/ol>\n

        LruCache\u7684\u4f7f\u7528\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n

        \/\/ \u521b\u5efaLruCache\u5bf9\u8c61\uff0c\u8bbe\u7f6e\u6700\u5927\u5bb9\u91cf\u4e3a10\nLruCache<String, Bitmap> cache = new LruCache<>(10);\n\n\/\/ \u6dfb\u52a0\u5bf9\u8c61\u5230\u7f13\u5b58\ncache.put(\"image1\", bitmap1);\ncache.put(\"image2\", bitmap2);\n\n\/\/ \u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u5bf9\u8c61\nBitmap image1 = cache.get(\"image1\");\nBitmap image2 = cache.get(\"image2\");\n\n\/\/ \u4ece\u7f13\u5b58\u4e2d\u79fb\u9664\u5bf9\u8c61\ncache.remove(\"image1\");\n\n\/\/ \u6e05\u7a7a\u7f13\u5b58\ncache.evictAll();<\/code><\/pre>\n
        \u901a\u8fc7\u4f7f\u7528LruCache\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u5185\u5b58\u4e2d\u7684\u7f13\u5b58\u5bf9\u8c61\uff0c\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u54cd\u5e94\u901f\u5ea6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        LruCache\u4ecb\u7ecd LruCache\u662fAndroid\u4e2d\u7684\u4e00\u4e2a\u7f13\u5b58\u7c7b\uff0c\u5b83\u4f7f\u7528\u4e86\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\uff08Least Rec […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[195111],"tags":[],"class_list":["post-203627","post","type-post","status-publish","format-standard","hentry","category-android"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/203627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=203627"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/203627\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=203627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=203627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=203627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}