Brief introduction to the MVC Framework model and application in your (Android) project

Last Update:2015-04-27 Source: Internet

Author: User

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

The title is Ali telephone interview questions, always thought that they are very aware of the MVC pattern, the results were asked, the m, V, c The relationship between these are not clear, the most important is, can not be MVC and Android in the various components corresponding, so, interview certainly hung, but the interview is a way to learn, You can tell what big companies are looking for, and what knowledge loopholes they have, such as learning a lot from this INTERVIEW.You can also look at the following content, but also think about the MVC and Android components of the corresponding relationship between the clear, see if there is the same as I smattering mvc.If there is a problem in writing, Welcome to the Discussion. reprint Please specify source: http://www.cnblogs.com/John-Chen/p/4458823.htmlLearn the MVC pattern read a lot of others summed up the article, there are several good, recommend to Everyone:Front End Android Primer (3): MVC mode: Http://isux.tencent.com/learn-android-from-zero-session3.html Http://isux.tencent.com/learn-android-from-zero-session4.html Http://isux.tencent.com/learn-android-from-zero-session5-html.htmlThe Activity revisited: http://www.therealjoshua.com/2012/07/android-architecture-part-10-the-activity-revisited/Talk about the evolution of UI architecture Design: Http://www.cnblogs.com/winter-cn/p/4285171.htmlDiagrams of MVC,MVP and MVVM: Http://www.ruanyifeng.com/blog/2015/02/mvcmvp_mvvm.htmlThe practice of the MVP on another framework Model:http://www.imooc.com/wenda/detail/216700After figuring out what MVC is and what it does with Android components, and looking at some of the implementations in your project, there are a lot of things that are already being implemented in terms of mvc, but in design and implementation, we didn't think of frame patterns, just based on previous experience and some basic design ideas, So when I was asked about the MVC pattern, I didn't know where the project would be Useful. I don't think you know anything about it. framework patterns and design patterns, The main thing is to find ways to decouple and improve the stability of the Application.The following is an implementation of the project to introduce the MVC framework pattern in android:The project has a track function that records several states: record, pause, stop:、Next I extract the logic of the trajectory control section, and introduce the MVC design idea of this part briefly.Demo Source Address: Https://github.com/John-Chen/BlogSamples/tree/master/MVCDemo　　View Implementation:<pre> public classTrackctrlviewImplementsview.onclicklistener{//------------------------Constants------------------------//-------------------------fields-------------------------- PrivateImageView btnstarttrack, btnstoptrack, btnpausetrack; PrivateTrackctrlviewlistener listener; PrivateTrackrecordinfo trackrecordinfo; //-----------------------constructors---------------------- publictrackctrlview (activity activity, trackctrlviewlistener listener) { this. Listener =listener; Btnstarttrack=(ImageView) Activity.findviewbyid (r.id.btnstarttrack); Btnstoptrack=(ImageView) Activity.findviewbyid (r.id.btnstoptrack); Btnpausetrack=(ImageView) Activity.findviewbyid (r.id.btnpausetrack); Btnstarttrack.setonclicklistener ( this); Btnstoptrack.setonclicklistener ( this); Btnpausetrack.setonclicklistener ( this); Btnpausetrack.setonclicklistener ( this); } //--------Methods for/from superclass/interfaces----------- /*** Notify the Controller of user request*/@Override public voidOnClick (View V) {Switch(v.getid ()) { caser.id.btnstarttrack:if(listener! =NULL) {listener.trackstatusrequest (trackrecordstatus.recording); } break; caser.id.btnstoptrack:if(listener! =NULL) {listener.trackstatusrequest (trackrecordstatus.stoped); } break; caser.id.btnpausetrack:if(listener! =NULL){ if(trackrecordinfo.status = =Trackrecordstatus.paused) {listener.trackstatusrequest (trackrecordstatus.recording); }Else{listener.trackstatusrequest (trackrecordstatus.paused); } } break; default: break; } } //---------------------Methods public----------------------//---------------------Methods private--------------------- Private voidrefreshview () {trackrecordstatus trackstatus= Trackrecordinfo = =NULL?TrackRecordStatus.Stoped:trackRecordInfo.status; if(trackstatus = =Trackrecordstatus.recording) {btnstarttrack.setvisibility (view.gone); Btnpausetrack.setvisibility (view.visible); Btnstoptrack.setvisibility (view.visible); Btnpausetrack.setimageresource (r.drawable.btn_track_ctrl_pause); } Else if(trackstatus = =trackrecordstatus.paused) {btnstarttrack.setvisibility (view.gone); Btnpausetrack.setvisibility (view.visible); Btnstoptrack.setvisibility (view.visible); Btnpausetrack.setimageresource (r.drawable.btn_track_ctrl_resume); } Else { //trackrecordstatus.stopedbtnstarttrack.setvisibility (view.visible); Btnpausetrack.setvisibility (view.gone); Btnstoptrack.setvisibility (view.gone); } } //---------------------Getter & Setter----------------- public voidsettrackrecordinfo (@Nullable trackrecordinfo Trackrecordinfo) { this. Trackrecordinfo =trackrecordinfo; Refreshview (); } //---------------Inner and Anonymous Classes--------------- public Interfacetrackctrlviewlistener{/*** User Click button*/ public voidtrackstatusrequest (@Nullable trackrecordstatus newstatus); } //---------------------logical fragments-----------------}</pre>Model Implementation:<pre> public classTrackrecordinfo {//------------------------Constants------------------------//-------------------------fields-------------------------- Private Static FinalGson Gson =NewGson (); /*** should be saved track database id, This demo database operation is not implemented, temporary trackid has been 0*/ public inttrackid; publicTrackrecordstatus status; //-----------------------constructors---------------------- publicTrackrecordinfo (inttrackid, Trackrecordstatus Status) { this. TrackID =trackid; this. Status =status; } //--------Methods for/from superclass/interfaces-----------//---------------------Methods public----------------------@NonNull public Statictrackrecordinfo loadtrackrecordinfo (@NonNull context Context) {String pref= sputil.getstring (context, sputil.key_track_record_info, "")); if(!Textutils.isempty (pref)) { returnGson.fromjson (pref, Trackrecordinfo.class); } return NULL; } public Static voidchangetrackrecordinfo (@NonNull Context context, @Nullable trackrecordinfo Info) {sputil.savestring (context, sputil.key_track_record_info, INFO==NULL? "": Gson.tojson (info)); //model via message bus, notify view RefreshEventbus.getdefault (). Post (Neweventtrackrecordinfochanged (info)); } //---------------------Methods private---------------------//---------------------Getter & Setter-----------------//---------------Inner and Anonymous Classes---------------//---------------------logical fragments-----------------}</pre>Controller implementation:<pre> public classMainactivityextendsActionbaractivityImplementstrackctrlview.trackctrlviewlistener{PrivateTrackctrlview trackctrlview; PrivateTrackrecordinfo trackrecordinfo; @Overrideprotected voidonCreate (Bundle Savedinstancestate) {Super. OnCreate (savedinstancestate); Setcontentview (r.layout.activity_main); Trackctrlview=NewTrackctrlview ( this, this); Eventbus.getdefault (). Register ( this); Trackrecordinfo= Trackrecordinfo.loadtrackrecordinfo ( this); Trackctrlview.settrackrecordinfo (trackrecordinfo); } @Overrideprotected voidOnDestroy () {Super. OnDestroy (); Eventbus.getdefault (). Unregister ( this); } @Override public voidtrackstatusrequest (@Nullable trackrecordstatus Newstatus) {if(newstatus = =Trackrecordstatus.recording) { intTrackID = 0;//Create a trace in the database and get to the database IDTrackrecordinfo =NewTrackrecordinfo (trackid, trackrecordstatus.recording); }Else if(newstatus = =Trackrecordstatus.paused) {if(trackrecordinfo! =NULL) {trackrecordinfo.status=newstatus; } } Else{trackrecordinfo=NULL; } trackrecordinfo.changetrackrecordinfo ( this, trackrecordinfo); } public voidoneventmainthread (eventtrackrecordinfochanged event) {trackrecordinfo=event.info; Trackctrlview.settrackrecordinfo (trackrecordinfo); }}</pre>It's a bit late, and i'll go back to work TOMORROW.Brief introduction to the MVC Framework model and application in your (Android) project

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More

Brief introduction to the MVC Framework model and application in your (Android) project

Contact Us

A Free Trial That Lets You Build Big!

Sales Support

After-Sales Support