{"id":125812,"date":"2020-05-02T17:25:41","date_gmt":"2020-05-02T09:25:41","guid":{"rendered":"http:\/\/4563.org\/?p=125812"},"modified":"2020-05-02T17:25:41","modified_gmt":"2020-05-02T09:25:41","slug":"navigation-%e6%ba%90%e7%a0%81%e8%a7%a3%e6%9e%90%e5%8f%8a%e8%87%aa%e5%ae%9a%e4%b9%89-fragmentnavigator-%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=125812","title":{"rendered":"Navigation \u6e90\u7801\u89e3\u6790\u53ca\u81ea\u5b9a\u4e49 FragmentNavigator \u8be6\u89e3"},"content":{"rendered":"
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Navigation \u6e90\u7801\u89e3\u6790\u53ca\u81ea\u5b9a\u4e49 FragmentNavigator \u8be6\u89e3 <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : winlee28 <\/span> <\/i> 17<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u6e90\u7801\u89e3\u6790<\/h2>\n

\u8c37\u6b4c\u63a8\u51fa Navigation \u4e3b\u8981\u662f\u4e3a\u4e86\u7edf\u4e00\u5e94\u7528\u5185\u9875\u9762\u8df3\u8f6c\u884c\u4e3a\u3002\u672c\u6587\u4e3b\u8981\u662f\u6839\u636e Navigation \u7248\u672c\u4e3a 2.1.0 \u7684\u6e90\u7801\u8fdb\u884c\u8bb2\u89e3\u3002<\/p>\n

'androidx.navigation:navigation-fragment:2.1.0'  'androidx.navigation:navigation-ui:2.1.0'            'androidx.navigation:navigation-fragment-ktx:2.1.0'            'androidx.navigation:navigation-ui-ktx:2.1.0' <\/code><\/pre>\n
Navigation \u7684\u4f7f\u7528\u5f88\u7b80\u5355\uff0c\u5728\u521b\u5efa\u65b0\u9879\u76ee\u7684\u65f6\u5019\u53ef\u4ee5\u76f4\u63a5\u9009\u62e9 Bottom Navigation Activity \u9879\u76ee\uff0c\u8fd9\u6837\u9ed8\u8ba4\u5c31\u5df2\u7ecf\u5e2e\u6211\u4eec\u5b9e\u73b0\u4e86\u76f8\u5173\u9875\u9762\u903b\u8f91\u3002<\/p>\n
\u4e4b\u524d\u5199\u8fc7 Navigation \u76f8\u5173\u7684\u7528\u6cd5\uff0c\u8bf7\u79fb\u6b65\uff1a<\/p>\n
Android Jetpack \u67b6\u6784\u7ec4\u4ef6 \u2014 Navigation \u5165\u5751\u8be6\u89e3<\/p>\n
Navigation \u7684\u6e90\u7801\u4e5f\u5f88\u7b80\u5355\uff0c\u4f46\u662f\u5374\u6d89\u53ca\u5230\u5f88\u591a\u7684\u7c7b\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u4e2a\uff1a<\/p>\n
    \n
  • Navigation \u63d0\u4f9b\u67e5\u627e NavController \u65b9\u6cd5<\/li>\n
  • NavHostFragment \u7528\u4e8e\u627f\u8f7d\u5bfc\u822a\u7684\u5185\u5bb9\u7684\u5bb9\u5668<\/li>\n
  • NavController \u901a\u8fc7 navigate \u5b9e\u73b0\u9875\u9762\u7684\u8df3\u8f6c<\/li>\n
  • Navigator \u662f\u4e00\u4e2a abstract\uff0c\u6709\u662f\u4e2a\u4e3b\u8981\u5b9e\u73b0\u7c7b<\/li>\n
  • NavDestination \u5bfc\u822a\u8282\u70b9<\/li>\n
  • NavGraph \u5bfc\u822a\u8282\u70b9\u9875\u9762\u96c6\u5408<\/li>\n<\/ul>\n
    \u6211\u4eec\u9996\u5148\u4ece NavHostFragment \u5165\u624b\u67e5\u770b\uff0c\u56e0\u4e3a\u4ed6\u662f\u76f4\u63a5\u5b9a\u4e49\u5728\u6211\u4eec\u7684 XML \u6587\u4ef6\u4e2d\u7684\uff0c\u6211\u4eec\u76f4\u63a5\u67e5\u770b\u5668\u751f\u547d\u5468\u671f\u65b9\u6cd5 onCreate\uff1a<\/p>\n
      @CallSuper     @Override     public void onCreate(@Nullable Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         final Context context = requireContext();          mNavController = new NavHostController(context); \/\/1         mNavController.setLifecycleOwner(this);                ....                onCreateNavController(mNavController);\/\/2         ....     } <\/code><\/pre>\n
    \u6ce8\u91ca 1 \u5904 \u76f4\u63a5\u521b\u5efa\u4e86 NavHostController \u5e76\u901a\u8fc7 findNavController \u65b9\u6cd5\u66b4\u9732\u7ed9\u5916\u90e8\u8c03\u7528\u8005\u3002NavHostController \u662f\u7ee7\u627f\u81ea NavController \u7684\u3002\u6ce8\u91ca 2 \u5904\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
       @CallSuper    protected void onCreateNavController(@NonNull NavController navController) {        navController.getNavigatorProvider().addNavigator(                new DialogFragmentNavigator(requireContext(), getChildFragmentManager()));        navController.getNavigatorProvider().addNavigator(createFragmentNavigator());    } <\/code><\/pre>\n
    \u901a\u8fc7 navController \u83b7\u53d6 NavigatorProvider \u5e76\u5411\u5176\u4e2d\u6dfb\u52a0\u4e86\u4e24\u4e2a Navigator\uff0c\u5206\u522b\u4e3a DialogFragmentNavigator \u548c FragmentNavigator \u3002\u53e6\u5916\u5728 NavController \u7684\u6784\u9020\u65b9\u6cd5\u4e2d\u8fd8\u6dfb\u52a0\u4e86\u53e6\u5916\u4e24\u4e2a Navigator\uff0c\u5982\u4e0b\uff1a<\/p>\n
    public NavController(@NonNull Context context) {     ....     mNavigatorProvider.addNavigator(new NavGraphNavigator(mNavigatorProvider));     mNavigatorProvider.addNavigator(new ActivityNavigator(mContext)); } <\/code><\/pre>\n
    \u4ed6\u4eec\u90fd\u662f Navigator \u7684\u5b9e\u73b0\u7c7b\u3002\u5206\u522b\u5bf9\u5e94\u4e8e DialogFragment \u3001Fragment \u548c Activity \u7684\u9875\u9762\u8df3\u8f6c\u3002\u5927\u5bb6\u53ef\u80fd\u5bf9\u4e8e NavGraphNavigator \u4e00\u4e9b\u597d\u5947\uff0c\u5b83\u662f\u7528\u5728\u4ec0\u4e48\u5730\u65b9\u7684\u5462\uff1f \u5176\u5b9e\u6211\u4eec\u5728 XML \u4e2d\u914d\u7f6e\u7684 navGraph \u5bf9\u5e94\u7684 navigation \u8ddf\u8282\u70b9\u6587\u4ef6\u4e2d\u7684 startDestination \u5c31\u662f\u901a\u8fc7 NavGraphNavigator \u6765\u5b9e\u73b0\u8df3\u8f6c\u7684\u3002\u8fd9\u4e5f\u662f\u5b83\u76ee\u524d\u552f\u4e00\u7684\u7528\u9014\u3002<\/p>\n
    \u5404\u4e2a Navigator \u901a\u8fc7\u590d\u5199 navigate \u65b9\u6cd5\u6765\u5b9e\u73b0\u5404\u81ea\u7684\u8df3\u8f6c\u903b\u8f91\u3002\u8fd9\u91cc\u91cd\u70b9\u5f3a\u8c03\u4e0b FragmentNavigator \u7684\u5b9e\u73b0\u903b\u8f91\uff1a<\/p>\n
    public NavDestination navigate(@NonNull Destination destination, @Nullable Bundle args,         @Nullable NavOptions navOptions, @Nullable Navigator.Extras navigatorExtras) {        ....        final Fragment frag = instantiateFragment(mContext, mFragmentManager,             className, args);     frag.setArguments(args);     final FragmentTransaction ft = mFragmentManager.beginTransaction();      ....      ft.replace(mContainerId, frag); \/\/1         .... } <\/code><\/pre>\n
    \u6700\u5173\u952e\u7684\u4e00\u884c\u4ee3\u7801\u5c31\u662f\u6ce8\u91ca 1 \u5904\u3002\u4ed6\u662f\u901a\u8fc7 replace \u6765\u52a0\u8f7d Fragment \u7684 \uff0c\u8fd9\u4e0d\u7b26\u5408\u6211\u4eec\u5b9e\u9645\u7684\u5f00\u53d1\u903b\u8f91\u3002\u6587\u7ae0\u540e\u7eed\u4f1a\u8bb2\u89e3\u5982\u4f55\u81ea\u5b9a\u4e49 FragmentNavigator \u6765\u907f\u514d Fragment \u5728\u5207\u6362\u7684\u65f6\u5019 \u751f\u547d\u5468\u671f\u7684\u6267\u884c\u3002<\/p>\n
    \u56de\u5230\u4e0a\u6587\u4e2d\u7684 navController \u83b7\u53d6\u7684 NavigatorProvider \u5176\u5185\u90e8\u662f\u7ef4\u62a4\u4e86\u4e00\u4e2a HashMap \u6765\u5b58\u50a8\u76f8\u5173\u7684 Navigator \u4fe1\u606f\u3002\u901a\u8fc7\u83b7\u53d6\u5230 Navigator \u7684\u6ce8\u89e3 Name \u4e3a key \u548c Navigator \u7684 getClass \u4e3a value \u8fdb\u884c\u5b58\u50a8\u3002<\/p>\n
    \u6211\u4eec\u5728\u56de\u5230\u4e0a\u6587\u4e2d\u7684 onCreate \u65b9\u6cd5\uff1a<\/p>\n
    @CallSuper @Override public void onCreate(@Nullable Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     final Context context = requireContext();      ....        if (mGraphId != 0) {         mNavController.setGraph(mGraphId);     } else {               ....                 if (graphId != 0) {             mNavController.setGraph(graphId, startDestinationArgs);         }     } } <\/code><\/pre>\n
    \u8fd9\u91cc\u901a\u8fc7 mNavController \u8c03\u7528\u4e86 setGraph \u3002\u8fd9\u91cc\u4e3b\u8981\u662f\u4e3a\u4e86\u89e3\u6790\u6211\u4eec\u7684 XML \u4e2d\u914d\u7f6e\u7684 mobile_navigation \u8282\u70b9\u4fe1\u606f\u6587\u4ef6\u3002\u4f1a\u6839\u636e\u4e0d\u540c\u7684\u8282\u70b9\u6765\u5404\u81ea\u89e3\u6790\u3002<\/p>\n
    @NonNull private NavDestination inflate(@NonNull Resources res, @NonNull XmlResourceParser parser,         @NonNull AttributeSet attrs, int graphResId)         throws XmlPullParserException, IOException {              Navigator navigator = mNavigatorProvider.getNavigator(parser.getName());         final NavDestination dest = navigator.createDestination();          dest.onInflate(mContext, attrs);        ....                  final String name = parser.getName();         if (TAG_ARGUMENT.equals(name)) { \/\/ argument \u8282\u70b9             inflateArgumentForDestination(res, dest, attrs, graphResId);         } else if (TAG_DEEP_LINK.equals(name)) { \/\/ deeplink \u8282\u70b9             inflateDeepLink(res, dest, attrs);         } else if (TAG_ACTION.equals(name)) { \/\/ action \u8282\u70b9             inflateAction(res, dest, attrs, parser, graphResId);         } else if (TAG_INCLUDE.equals(name) && dest instanceof NavGraph) { \/\/ include \u8282\u70b9             final TypedArray a = res.obtainAttributes(attrs, R.styleable.NavInclude);             final int id = a.getResourceId(R.styleable.NavInclude_graph, 0);             ((NavGraph) dest).addDestination(inflate(id));             a.recycle();         } else if (dest instanceof NavGraph) { \/\/ NavGraph \u8282\u70b9             ((NavGraph) dest).addDestination(inflate(res, parser, attrs, graphResId));         }     }      return dest; } <\/code><\/pre>\n
    \u901a\u8fc7\u83b7\u53d6 NavInflater \u6765\u5bf9\u5176\u8fdb\u884c\u89e3\u6790\u3002\u89e3\u6790\u540e\u8fd4\u56de NavGraph\uff0cNavGraph \u662f\u7ee7\u627f\u81ea NavDestination \u7684\u3002\u91cc\u9762\u4e3b\u8981\u662f\u4fdd\u5b58\u4e86\u6240\u6709\u89e3\u6790\u51fa\u6765\u7684\u8282\u70b9\u4fe1\u606f\u3002<\/p>\n
    \u6700\u540e\u7b80\u5355\u7684\u603b\u7ed3\u4e0b\u5c31\u662f\u901a\u8fc7 NavHostFragment \u83b7\u53d6\u5230 NavContorl \u5e76\u5b58\u50a8\u4e86\u76f8\u5173\u7684 Navigator \u4fe1\u606f\u3002\u901a\u8fc7\u5404\u81ea\u7684 navigate \u65b9\u6cd5\u8fdb\u884c\u9875\u9762\u7684\u8df3\u8f6c\u3002\u901a\u8fc7 setGraph \u6765\u89e3\u6790\u914d\u7f6e\u7684\u9875\u9762\u8282\u70b9\u4fe1\u606f\uff0c\u5e76\u5c01\u88c5\u4e3a NavGraph \u5bf9\u8c61\u3002\u91cc\u9762\u901a\u8fc7 SparseArray \u6765\u5b58\u50a8 Destination \u4fe1\u606f\u3002<\/p>\n
    \u81ea\u5b9a\u4e49 FragmentNavigator<\/h2>\n
    \u4e0a\u6587\u4e2d\u6211\u4eec\u8bf4\u4e86\u9700\u8981\u81ea\u5b9a\u4e49\u81ea\u5df1\u7684 Navigator \u7528\u4e8e\u627f\u8f7d Fragment \u3002\u4e3b\u8981\u7684\u5b9e\u73b0\u601d\u8def\u5c31\u662f\u7ee7\u627f\u73b0\u6709\u7684 FragmentNavigator \u5e76\u590d\u5199\u5176 navigate \u65b9\u6cd5\uff0c\u5c06\u5176\u4e2d\u7684 replace \u65b9\u6cd5 \u66ff\u6362\u4e3a show \u548c hide \u65b9\u6cd5 \u6765\u5b8c\u6210 Fragment \u7684\u5207\u6362\u3002<\/p>\n
    \u90a3\u4e48\u6211\u4eec\u81ea\u5b9a\u4e49\u7684 Navigator \u5982\u4f55\u624d\u80fd\u8ba9\u7cfb\u7edf\u8bc6\u522b\u5462\uff1f \u8fd9\u4e5f\u7b80\u5355\uff0c\u53ea\u8981\u7ed9\u6211\u4eec\u7684 \u7c7b\u52a0\u4e0a\u6ce8\u89e3 @Navigator.Name(value) \u90a3\u4e48\u4ed6\u5c31\u662f\u4e00\u4e2a Navigator \u4e86\u3002\u6700\u540e\u901a\u8fc7\u4e0a\u6587\u4e2d\u5206\u6790\u7684\u601d\u8def \u5728\u5c06\u5176\u52a0\u5165\u5230 NavigatorProvider \u4e2d \u5373\u53ef\u3002<\/p>\n
    \u5177\u4f53\u7684\u81ea\u5b9a\u4e49 Navigator \u5df2\u7ecf\u5728\u9879\u76ee Android Jetpack \u67b6\u6784\u5f00\u53d1\u7ec4\u4ef6\u5316\u5e94\u7528\u5b9e\u6218  \u4e2d\u4e86\uff0c\u7c7b\u540d\uff1aFixFragmentNavigator \u3002\u5927\u5bb6\u53ef\u4ee5\u81ea\u884c\u53bb\u770b\u4e0b\u3002\u8fd9\u91cc\u5c31\u5c06\u6838\u5fc3\u7684\u4ee3\u7801\u8d34\u51fa\u6765\u770b\u4e0b\uff1a<\/p>\n
    @Navigator.Name(\"fixFragment\") \/\/\u65b0\u7684 Navigator \u540d\u79f0 class FixFragmentNavigator(context: Context, manager: FragmentManager, containerId: Int) :     FragmentNavigator(context, manager, containerId) {            override fun navigate(             destination: Destination,             args: Bundle?,             navOptions: NavOptions?,             navigatorExtras: Navigator.Extras?         ): NavDestination? {              ....               \/\/ft.replace(mContainerId, frag)              \/**              * 1 \u3001\u5148\u67e5\u8be2\u5f53\u524d\u663e\u793a\u7684 fragment \u4e0d\u4e3a\u7a7a\u5219\u5c06\u5176 hide              * 2 \u3001\u6839\u636e tag \u67e5\u8be2\u5f53\u524d\u6dfb\u52a0\u7684 fragment \u662f\u5426\u4e0d\u4e3a null\uff0c\u4e0d\u4e3a null \u5219\u5c06\u5176\u76f4\u63a5 show              * 3 \u3001\u4e3a null \u5219\u901a\u8fc7 instantiateFragment \u65b9\u6cd5\u521b\u5efa fragment \u5b9e\u4f8b              * 4 \u3001\u5c06\u521b\u5efa\u7684\u5b9e\u4f8b\u6dfb\u52a0\u5728\u4e8b\u52a1\u4e2d              *\/             val fragment = mManager.primaryNavigationFragment \/\/\u5f53\u524d\u663e\u793a\u7684 fragment             if (fragment != null) {                 ft.hide(fragment)             }              var frag: Fragment?             val tag = destination.id.toString()             frag = mManager.findFragmentByTag(tag)             if (frag != null) {                 ft.show(frag)             } else {                 frag = instantiateFragment(mContext, mManager, className, args)                 frag.arguments = args                 ft.add(mContainerId, frag, tag)             }              ....         } } <\/code><\/pre>\n
    \u81ea\u5b9a\u4e49\u5b8c\u6210\u597d\uff0c\u8fd8\u9700\u8981\u5c06 mobile_navigation \u7684\u8282\u70b9\u4e2d\u8fdc fragment \u66ff\u6362\u4e3a fixFragment \u8282\u70b9\u3002\u5e76\u5220\u9664\u5e03\u5c40\u6587\u4ef6\u4e2d NavHostFragment \u8282\u70b9\u7684<\/p>\n
    app:navGraph=\"@navigation\/mobile_navigation\" <\/code><\/pre>\n
    \u4fe1\u606f\uff0c\u56e0\u4e3a\u6211\u4eec\u9700\u8981\u624b\u52a8\u5c06 FixFragmentNavigator \u548c NavControl \u8fdb\u884c\u5173\u8054\u3002<\/p>\n
    \/\/\u6dfb\u52a0\u81ea\u5b9a\u4e49\u7684 FixFragmentNavigator navController = Navigation.findNavController(this, R.id.nav_host_fragment) val fragment =     supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment val fragmentNavigator =     FixFragmentNavigator(this, supportFragmentManager, fragment!!.id) navController.navigatorProvider.addNavigator(fragmentNavigator)  navController.setGraph(R.navigation.mobile_navigation) <\/code><\/pre>\n
    \u8fd9\u6837\u5c31\u5b8c\u6210\u4e86\u81ea\u5b9a\u4e49 Navigator \u5b9e\u73b0\u5207\u6362 Tab \u7684\u65f6\u5019 Fragment \u751f\u547d\u5468\u671f\u4e0d\u4f1a\u91cd\u65b0\u6267\u884c\u4e86\u3002<\/p>\n
    \u5177\u4f53\u4ee3\u7801\u903b\u8f91\u8be6\u89c1\uff1aAndroid Jetpack \u67b6\u6784\u5f00\u53d1\u7ec4\u4ef6\u5316\u5e94\u7528\u5b9e\u6218 <\/p>\n<\/p><\/div>\n
     \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (0<\/span>)        <\/div>\n
     <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
      \n
    • \n","protected":false},"excerpt":{"rendered":"
      Navigation \u6e90\u7801\u89e3\u6790\u53ca\u81ea…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/125812"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=125812"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/125812\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=125812"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=125812"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=125812"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}