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ated bundle tells the fragment that its activity has completed its own activity oncreate onviewstaterestored bundle tells the fragment that all of the saved state of its view hierarchy has been restored onstart makes the fragment visible to the user based on its containing activity being started onresume makes the fragment begin interacting with the user based on its containing activity being resumed as a fragment is no longer being used it goes through a reverse series of callbacks onpause fragment is no longer interacting with the user either because its activity is being paused or a fragment operation is modifying it in the activity onstop fragment is no longer visible to the user either because its activity is being stopped or a fragment operation is modifying it in the activity ondestroyview allows the fragment to clean up resources associated with its view ondestroy called to do final cleanup of the fragment s state ondetach called immediately prior to the fragment no longer being associated with its activity layout fragments can be used as part of your application s layout allowing you to better modularize your code and more easily adjust your user interface to the screen it is running on as an example we can look at a simple program consisting of a list of items and display of the details of each item an activity s layout xml can include fragment tags to embed fragment instances inside of the layout for example here is a simple layout that embeds one fragment framelayout xmlns android http schemas android com apk res android android layout_width match_parent android layout_height match_parent fragment class com example android apis app fragmentlayout titlesfragment android id id titles android layout_width match_parent android layout_height match_parent framelayout the layout is installed in the activity in the normal way override protected void oncreate bundle savedinstancestate super oncreate savedinstancestate setcontentview r layout fragment_layout the titles fragment showing a list of titles is fairly simple relying on listfragment for most of its work note the implementation of clicking an item depending on the current activity s layout it can either create and display a new fragment to show the details in place more about this later or start a new activity to show the details public static class titlesfragment extends listfragment boolean mdualpane int mcurcheckposition 0 override public void onactivitycreated bundle savedinstancestate super onactivitycreated savedinstancestate populate list with our static array of titles setlistadapter new arrayadapter string getactivity android r layout simple_list_item_activated_1 shakespeare titles check to see if we have a frame in which to embed the details fragment directly in the containing ui view detailsframe getactivity findviewbyid r id details mdualpane detailsframe null detailsframe getvisibility view visible if savedinstancestate null restore last state for checked position mcurcheckposition savedinstancestate getint curchoice 0 if mdualpane in dual pane mode the list view highlights the selected item getlistview setchoicemode listview choice_mode_single make sure our ui is in the correct state showdetails mcurcheckposition override public void onsaveinstancestate bundle outstate super onsaveinstancestate outstate outstate putint curchoice mcurcheckposition override public void onlistitemclick listview l view v int position long id showdetails position helper function to show the details of a selected item either by displaying a fragment in place in the current ui or starting a whole new activity in which it is displayed void showdetails int index mcurcheckposition index if mdualpane we can display everything in place with fragments so update the list to highlight the selected item and show the data getlistview setitemchecked index true check what fragment is currently shown replace if needed detailsfragment details detailsfragment getfragmentmanager findfragmentbyid r id details if details null details getshownindex index make new fragment to show this selection details detailsfragment newinstance index execute a transaction replacing any existing fragment with this one inside the frame fragmenttransaction ft getfragmentmanager begintransaction if index 0 ft replace r id details details else ft replace r id a_item details ft settransition fragmenttransaction transit_fragment_fade ft commit else otherwise we need to launch a new activity to display the dialog fragment with selected text intent intent new intent intent setclass getactivity detailsactivity class intent putextra index index startactivity intent the details fragment showing the contents of a selected item just displays a string of text based on an index of a string array built in to the app public static class detailsfragment extends fragment create a new instance of detailsfragment initialized to show the text at index public static detailsfragment newinstance int index detailsfragment f new detailsfragment supply index input as an argument bundle args new bundle args putint index index f setarguments args return f public int getshownindex return getarguments getint index 0 override public view oncreateview layoutinflater inflater viewgroup container bundle savedinstancestate if container null we have different layouts and in one of them this fragment s containing frame doesn t exist the fragment may still be created from its saved state but there is no reason to try to create its view hierarchy because it won t be displayed note this is not needed we could just run the code below where we would create and return the view hierarchy it would just never be used return null scrollview scroller new scrollview getactivity textview text new textview getactivity int padding int typedvalue applydimension typedvalue complex_unit_dip 4 getactivity getresources getdisplaymetrics text setpadding padding padding padding padding scroller addview text text settext shakespeare dialogue getshownindex return scroller in this case when the user clicks on a title there is no details container in the current activity so the titles fragment s click code will launch a new activity to display the details fragment public static class detailsactivity extends activity override protected void oncreate bundle savedinstancestate super oncreate savedinstancestate if getresources getconfiguration orientation configuration orientation_landscape if the screen is now in landscape mode we can show the dialog in line with the list so we don t need this activity finish return if savedinstancestate null during initial setup plug in the details fragment detailsfragment details new detailsfragment details setarguments getintent getextras getfragmentmanager begintransaction add android r id content details commit however the screen may be large enough to show both the list of titles and details about the currently selected title to use such a layout on a landscape screen this alternative layout can be placed under layout land linearlayout xmlns android http schemas android com apk res android android orientation horizontal android layout_width match_parent android layout_height match_parent fragment class com example android apis app fragmentlayout titlesfragment android id id titles android layout_weight 1 android layout_width 0px android layout_height match_parent framelayout android id id details android layout_weight 1 android layout_width 0px android layout_height match_parent android background android attr detailselementbackground linearlayout note how the prior code will adjust to this alternative ui flow the titles fragment will now embed the details fragment inside of this activity and the details activity will finish itself if it is running in a configuration where the details can be shown in place when a configuration change causes the activity hosting these fragments to restart its new instance may use a different layout that doesn t include the same fragments as the previous layout in this case all of the previous fragments will still be instantiated and running in the new instance however any that are no longer associated with a fragment tag in the view hierarchy will not have their content view created and will return false from isinlayout the code here also shows how you can determine if a fragment placed in a container is no longer running in a layout with that container and avoid creating its view hierarchy in that case the attributes of the fragment tag are used to control the layoutparams provided when attaching the fragment s view to the parent container they can also be parsed by the fragment in oninflate activity attributeset bundle as parameters the fragment being instantiated must have some kind of unique identifier so that it can be re associated with a previous instance if the parent activity needs to be destroyed and recreated this can be provided these ways if nothing is explicitly supplied the view id of the container will be used android tag can be used in fragment to provide a specific tag name for the fragment android id can be used in fragment to provide a specific identifier for the fragment back stack the transaction in which fragments are modified can be placed on an internal back stack of the owning activity when the user presses back in the activity any transactions on the back stack are popped off before the activity itself is finished for example consider this simple fragment that is instantiated with an integer argument and displays that in a textview in its ui public static class countingfragment extends fragment int mnum create a new instance of countingfragment providing num as an argument static countingfragment newinstance int num countingfragment f new countingfragment supply num input as an argument bundle args new bundle args putint num num f setarguments args return f when creating retrieve this instance s number from its arguments override public void oncreate bundle savedinstancestate super oncreate savedinstancestate mnum getarguments null getarguments getint num 1 the fragment s ui is just a simple text view showing its instance number override public view oncreateview layoutinflater inflater viewgroup container bundle savedinstancestate view v inflater inflate r layout hello_world container false view tv v findviewbyid r id text textview tv settext fragment mnum tv setbackgrounddrawable getresources getdrawable android r drawable gallery_thumb return v a function that creates a new instance of the fragment replacing whatever current fragment instance is being shown and pushing that change on to the back stack could be written as void addfragmenttostack mstacklevel instantiate a new fragment fragment newfragment countingfragment newinstance mstacklevel add the fragment to the activity pushing this transaction on to the back stack fragmenttransaction ft getfragmentmanager begintransaction ft replace r id simple_fragment newfragment ft settransition fragmenttransaction transit_fragment_open ft addtobackstack null ft commit after each call to this function a new entry is on the stack and pressing back will pop it to return the user to whatever previous state the activity ui was in fragments appearing or disappearing do not generate system events for accessibility so set a title on your fragments with view setaccessibilitypanetitle charsequence to notify accessibility users of these ui transitions summary nested classes class fragment instantiationexception this class was deprecated in api level 28 use fragment instantiationexception class fragment savedstate this class was deprecated in api level 28 use fragment savedstate xml attributes android fragmentallowentertransitionoverlap sets whether the enter and exit transitions should overlap when transitioning forward android fragmentallowreturntransitionoverlap sets whether the enter and exit transitions should overlap when transitioning because of popping the back stack android fragmententertransition the transition that will be used to move views into the initial scene android fragmentexittransition the transition that will be used to move views out of the scene when the fragment is removed hidden or detached when not popping the back stack android fragmentreentertransition the transition that will be used to move views in to the scene when returning due to popping a back stack android fragmentsharedelemententertransition the transition that will be used for shared elements transferred into the content scene android fragmentsharedelementreturntransition the transition that will be used for shared elements transferred back during a pop of the back stack inherited constants from interface android content componentcallbacks2 int trim_memory_background level for ontrimmemory int the process has gone on to the lru list int trim_memory_complete this constant was deprecated in api level 35 apps are not notified of this level since api level 34 int trim_memory_moderate this constant was deprecated in api level 35 apps are not notified of this level since api level 34 int trim_memory_running_critical this constant was deprecated in api level 35 apps are not notified of this level since api level 34 int trim_memory_running_low this constant was deprecated in api level 35 apps are not notified of this level since api level 34 int trim_memory_running_moderate this constant was deprecated in api level 35 apps are not notified of this level since api level 34 int trim_memory_ui_hidden level for ontrimmemory int the process had been showing a user interface and is no longer doing so public constructors fragment default constructor public methods void dump string prefix filedescriptor fd printwriter writer string args print the fragments s state into the given stream final boolean equals object o subclasses can not override equals final activity getactivity return the activity this fragment is currently associated with boolean getallowentertransitionoverlap returns whether the exit transition and enter transition overlap or not boolean getallowreturntransitionoverlap returns whether the return transition and reenter transition overlap or not final bundle getarguments return the arguments supplied to setarguments bundle if any final fragmentmanager getchildfragmentmanager return a private fragmentmanager for placing and managing fragments inside of this fragment context getcontext return the context this fragment is currently associated with transition getentertransition returns the transition that will be used to move views into the initial scene transition getexittransition returns the transition that will be used to move views out of the scene when the fragment is removed hidden or detached when not popping the back stack final fragmentmanager getfragmentmanager return the fragmentmanager for interacting with fragments associated with this fragment s activity final object gethost return the host object of this fragment final int getid r...
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