android fragment tutorial

Requirements Scenario:The following scenario is encountered in development:1. Create Fragment A display. The structure of this stack is:　　12. Create Fragment B and display. From bottom to top, the structure of the stack is:2.Fragment B1.Fragment A3. Create Fragment C and dis

pause UI updates, suspend threads, or pause those that do not need to be updated centralized processing of the CPU. Since this method is called, the process may be terminated, so all editing and state change information is saved. Onsaveinstancestate: Called at the end of the active life cycle, calling the method to save the state change of the UI, and saving the state change information for the UI to Saveinstancestate , this bundle is passed to onCreate,Oncreateview, and onactivitycreate(if it

to the fragment is not destroyed, (resulting in the first life cycle diagram Today task fragment executed two times Onresume, because a new one and the original was not destroyed, there are two today's task fragment), after the screen opened, the activity has vertical screen switch to horizontal screen (we force the setting of the horizontal screen display), The

are going to set a change in two or more dimensions, we can use set tag, which corresponds to the Android Animatorset class, and the following example sets both the down and fade effects. Set has an attribute android:ordering, which defaults to together, that is, the changes of each dimension occur simultaneously, and can be set to sequentially in turn.XML version= "1.0" encoding= "Utf-8"?> Setxmlns:android= "Http://schemas.android.com/apk/res/

its other life cycles, including the activity's OnStart and onresum, so The time-consuming operation should be caused by some code execution inside Android, which is limited, so there is no need to drill down to the bottom, just note that when we encounter a clip, there are two optimization methods, one is the cache fragment, the other is the time to shorten the initialization.Well, the other is yesterday

Bottombar　　　　Bottombar is an open source framework on GitHub, since 1.3.3 does not support fragments, it has to be configured for a long time, regardless of whether the app's fragment or V4 program always comes back. So this is the way to achieve, the effect is good. GitHub has a detailed explanation, needless to say.　This roughike is the owner of the project (Tribute to the Great God).I use the Android Stu

Fragmengmanager call transaction to operate the fragment.For example, the following structure of the demo:Mainactivity contains Fragment1,fragment1 and contains Fragment2. In order to let Fragment1 and fragmeng2 switch, in Mainactivity contains Fragmengmanager FM to 1, 2 switching, the code is as follows (in Mainactivity.java):public static void Switchcontent (Fragment from,fragment to,string totag) {if (f

fragment1 = new Fragment1 ();FragmentTransaction. replace (android. R. id. content, fragment1 );FragmentTransaction. addToBackStack (null );FragmentTransaction. commit ();}}5. Press F11 to debug the simulator. 6. Click the second line to display a window. 7. Use the DDMS tool to generate an xml file under the package path of the application. To create a list style option, first create a preferences. xml file and then fill in various elements in the

. Put the content "troops on the island " into an envelope.(Envelopes are bundles). Notice that this is Chitian, of course, to make a mark or something to tag, that is, add tag, here we specify is "179521".Finally tied to the dove to send out (commit ()).The above analogy is not very appropriate, now in formal language to illustrate the HA:If you are familiar with the life cycle of activity, you should know that each application has a unique task,task with a fallback stack backstack, which store

(DialogInterface dialog,Int whichButton ){(DialogFragmentExampleActivity)GetActivity (). doPositiveClick ();}}). SetNegativeButton ("Cancel ",New DialogInterface. OnClickListener (){Public void onClick (DialogInterface dialog,Int whichButton ){(DialogFragmentExampleActivity)GetActivity (). doNegativeClick ();}}). Create ();}Then, we can create two buttons, OK and Cancel. The title of the dialog box is obtained from the Bunddle object.To display the dialog box fragments, create an instance and c

Fragment are fragments that can be involved in the activity to understand the fragment, because they all can include the layout, all have their own life cycle.Below we want to let the main activity include two fragments, and let two pieces full of screen1. First, create a new two-fragment layout fileLeft.xml>linearlayout xmlns:

Android.view.layoutinflater;import Android.view.view;import android.view.viewgroup;/** * This is the fragment of the step * Author: Li Wu Super Email:[email Protected] * date:2015-1-2 * Time: PM 2:39 */public Class FRAGMENTPK extends Fragment{private view view; @Over Ridepublic View Oncreateview (Layoutinflater inflater, ViewGroup container,bundle savedinstancestate) {view = Inflater.inflate (r.layout.pk

Android fragment and Androidfragment Fragment can be used when you want to modularize the activity. We can say that fragment is a sub-activity. The following are some important features of fragment: 1. fragment has its own layo

. In the parent activity, after getting each fragment, call the corresponding fragment method in the interface method Public Static classMainactivityextendsActivityImplementsDummyfragment.someeventlistener {... Public voidOnsomeevent (intArg) { //parameters are passed in, and then the various fragment methods are called here to pass the message.Articlefrag

fragmentDetach () Removes the view from the UI and differs from remove (), at which point the state of fragment is still maintained by Fragmentmanager.The Attach () rebuilds the View view, attaches to the UI, and displays.Transatcion.commit ()//Commit a transactionTransatcion.commitallowingstateloss ()//Commit a transaction, and commit () the difference is that this allowed state value is missingExample:Fragmentmanager Fragmentmanager == fragmentmana

The fragment switch is required in the project and is always replaced with the replace () method fragmentHowever, this will have a problem that should be met by many friends:Each time you switch, fragment will re-instantiate, that is, run the Oncreatview () methodSo how do I make multiple fragment switch to each other without re-instantiating?The correct way to s

Xiao Kee 1. About the initialization of fragmentWhen we set up the interface using the avtivity+fragment combination, we usually have new fragment in the activity, but when we need to pass the parameters in fragment, Are we going to have a problem with the way we use the constructor in the fragment? Yes, we are u

Reprint Please specify source: http://blog.csdn.net/yangyu20121224/article/details/9016223In the previous article, we spent a lot of time explaining the use of fragment, the new introduction class, in order to let you have a firm grasp of its use, so that readers in the future development will be able to use it skillfully.First, to achieveII. Project Engineering StructureThird, detailed code writing1, Main tab layout interface, Main_tab_layout:Android

To create a dynamic or multi-panel user interface on an Android system, you need to encapsulate the UI component and activity behavior as a module, allowing it to switch between display and hide in your activity flexibly. You can use Fragment classes to create these modules, which can behave like nested activity, which define their own layouts and manage their own life cycles.When a

The implementation of the function is very simple, but also the most basic, up and down is two fragment, above the fragment is a ListView, when clicked Item, the following fragment display the corresponding text detailsThe specific implementation steps are as follows:① Create the project Fragmentexam, the catalog view is as follows (add the demo of the previous f