{"id":207328,"date":"2023-08-23T07:31:12","date_gmt":"2023-08-22T23:31:12","guid":{"rendered":"https:\/\/www.idc.net\/help\/207328\/"},"modified":"2023-08-23T07:31:12","modified_gmt":"2023-08-22T23:31:12","slug":"android%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e7%bb%84%e4%bb%b6activity%e7%9a%84singletask11","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/207328\/","title":{"rendered":"Android\u5e94\u7528\u7a0b\u5e8f\u7ec4\u4ef6Activity\u7684”singleTask”(11)"},"content":{"rendered":"

\u5230\u8fd9\u91cc\uff0c\u601d\u8def\u5c31\u7406\u6e05\u4e86\u3002<\/p>\n

\u867d\u7136SubActivity\u7684launchMode\u88ab\u8bbe\u7f6e\u4e3a\"singleTask\"\u6a21\u5f0f\uff0c\u4f46\u662f\u5b83\u5e76\u4e0d\u50cf\u5b98\u65b9\u6587\u6863\u63cf\u8ff0\u7684\u4e00\u6837\uff1a<\/p>\n

The system creates a new task and instantiates the activity at the root of the new task.<\/p>\n

\u800c\u662f\u5728\u8ddf\u5b83\u6709\u76f8\u540ctaskAffinity\u7684\u4efb\u52a1\u4e2d\u542f\u52a8\uff0c\u5e76\u4e14\u4f4d\u4e8e\u8fd9\u4e2a\u4efb\u52a1\u7684\u5806\u6808\u9876\u7aef\uff0c<\/p>\n

\u4e8e\u662f\uff0c\u524d\u9762\u90a3\u4e2a\u56fe\u4e2d\uff0c\u5c31\u4f1a\u51fa\u73b0\u4e00\u4e2a\u5e26 \u7740\"singleTask\"\u6807\u7b7e\u7684\u7bad\u5934\u6307\u5411\u4e00\u4e2a\u4efb\u52a1\u5806\u6808\u9876\u7aef\u7684Activity Y\u4e86\u3002<\/p>\n

\u90a3\u4e48\uff0c\u6211\u4eec\u6709\u6ca1\u6709\u529e\u6cd5\u8ba9\u4e00\u4e2a\"singleTask\"\u7684Activity\u5728\u65b0\u7684\u4efb\u52a1\u4e2d\u542f\u52a8\u5462?\u7b54\u6848\u662f\u80af\u5b9a\u7684\u3002\u4ece\u4e0a\u9762\u7684\u4ee3\u7801\u5206\u6790\u4e2d\uff0c\u53ea\u8981\u6211\u4eec\u80fd\u591f\u8fdb\u5165\u51fd\u6570startActivityUncheckedLocked\u7684\u8fd9\u4e2aif\u8bed\u53e5\u4e2d\uff1a<\/p>\n

\n \n 
    \n  \n  
  1. [java] view plaincopy <\/span>if<\/span> (r.resultTo == <\/span>null<\/span> && !addingToTask <\/span><\/span><\/li>\n  \n  
  2. && (launchFlags&Intent.FLAG_ACTIVITY_NEW_TASK) != 0<\/span>) { <\/span><\/span><\/li>\n  \n  
  3. \/\/ todo: should do better management of integers.<\/span> <\/span><\/span><\/li>\n  \n  
  4. mService.mCurTask++; <\/span><\/li>\n  \n  
  5. if<\/span> (mService.mCurTask <= <\/span>0<\/span>) { <\/span><\/span><\/li>\n  \n  
  6. mService.mCurTask = 1<\/span>; <\/span><\/span><\/li>\n  \n  
  7. } <\/span><\/li>\n  \n  
  8. r.task = new<\/span> TaskRecord(mService.mCurTask, r.info, intent, <\/span><\/span><\/li>\n  \n  
  9. (r.info.flags&ActivityInfo.FLAG_CLEAR_TASK_ON_LAUNCH) != 0<\/span>); <\/span><\/span><\/li>\n  \n  
  10. if<\/span> (DEBUG_TASKS) Slog.v(TAG, <\/span>\"Starting new activity \"<\/span> + r <\/span><\/span><\/li>\n  \n  
  11. + \" in new task \"<\/span> + r.task); <\/span><\/span><\/li>\n  \n  
  12. newTask = true<\/span>; <\/span><\/span><\/li>\n  \n  
  13. if<\/span> (mMainStack) { <\/span><\/span><\/li>\n  \n  
  14. mService.addRecentTaskLocked(r.task); <\/span><\/li>\n  \n  
  15. } <\/span><\/li>\n  \n  
  16. } <\/span><\/li>\n \n <\/ol><\/pre>\n
    \u90a3\u4e48\uff0c\u8fd9\u4e2a\u5373\u5c06\u8981\u542f\u52a8\u7684Activity\u5c31\u4f1a\u5728\u65b0\u7684\u4efb\u52a1\u4e2d\u542f\u52a8\u4e86\u3002\u8fdb\u5165\u8fd9\u4e2aif\u8bed\u53e5\u9700\u8981\u6ee1\u8db3\u4e09\u4e2a\u6761\u4ef6\uff0cr.resultTo\u4e3a null\uff0claunchFlags\u7684Intent.FLAG_ACTIVITY_NEW_TASK\u4f4d\u4e3a1\uff0c\u5e76\u4e14addingToTask\u503c\u4e3afalse\u3002 \u4ece\u4e0a\u9762\u7684\u5206\u6790\u4e2d\u53ef\u4ee5\u770b\u5230\uff0c\u5f53\u5373\u5c06\u8981\u542f\u52a8\u7684Activity\u7684launchMode\u4e3a\"singleTask\"\uff0c\u5e76\u4e14\u8c03\u7528startActivity\u65f6\u4e0d\u8981 \u6c42\u8fd4\u56de\u8981\u542f\u52a8\u7684Activity\u7684\u6267\u884c\u7ed3\u679c\u65f6\uff0c\u524d\u9762\u4e24\u4e2a\u6761\u4ef6\u53ef\u4ee5\u6ee1\u8db3\uff0c\u8981\u6ee1\u8db3\u7b2c\u4e09\u4e2a\u6761\u4ef6\uff0c\u53ea\u8981\u5f53\u524d\u7cfb\u7edf\u4e0d\u5b58\u5728affinity\u5c5e\u6027\u503c\u7b49\u4e8e\u5373\u5c06\u8981\u542f\u52a8\u7684 Activity\u7684taskAffinity\u5c5e\u6027\u503c\u7684\u4efb\u52a1\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
    \u6211\u4eec\u53ef\u4ee5\u7a0d\u5fae\u4fee\u6539\u4e00\u4e0b\u4e0a\u9762\u7684AndroidManifest.xml\u914d\u7f6e\u6587\u4ef6\u6765\u505a\u4e00\u4e0b\u8fd9\u4e2a\u5b9e\u9a8c\uff1a<\/p>\n
    \n \n 
      \n  \n  
    1. [java] view plaincopy <\/span><\/span><\/li>\n  \n  
    2.  <\/span><\/li>\n  \n  
    3. package<\/span>=<\/span>\"shy.luo.task\"<\/span> <\/span><\/span><\/li>\n  \n  
    4. android:versionCode=\"1\"<\/span> <\/span><\/span><\/li>\n  \n  
    5. android:versionName=\"1.0\"<\/span>>\u3000\u3000android:label=<\/span>\"@string\/app_name\"<\/span> <\/span><\/span><\/li>\n  \n  
    6. android:taskAffinity=\"shy.luo.task.main.activity\"<\/span>\u3000\u3000android:label=<\/span>\"@string\/sub_activity\"<\/span> <\/span><\/span><\/li>\n  \n  
    7. android:launchMode=\"singleTask\"<\/span> <\/span><\/span><\/li>\n  \n  
    8. android:taskAffinity=\"shy.luo.task.sub.activity\"<\/span>> <\/span><\/span><\/li>\n \n <\/ol><\/pre>\n
       <\/p>\n","protected":false},"excerpt":{"rendered":"
      \u5230\u8fd9\u91cc\uff0c\u601d\u8def\u5c31\u7406\u6e05\u4e86\u3002 \u867d\u7136SubActivity\u7684launchMode\u88ab\u8bbe\u7f6e\u4e3a\"singleTask\"\u6a21\u5f0f\uff0c […]<\/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-207328","post","type-post","status-publish","format-standard","hentry","category-android"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/207328","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=207328"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/207328\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=207328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=207328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=207328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}