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Data Sharing between Fragments and Activity in Android

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问题 Ive asked a similar question before and didn\'t get an answer and seems many other ppl are searching for an answer. So I am posting this question to hopefully get a clear answer that everyone can benefit from. I have an activity with 2 fragments in it. I want fragment2 to set a boolean variable in Activity when a checkbox is checked so that fragment1 can know if the checkbox was checked. This is my Code: Activity: public class modestab extends Activity{ public static Context appContext;

Sync data between Android App and webserver [closed]

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I want to sync data (such as db record, media) between an Android App and a Server. If you've seen Evernote or similar Applications, you certainly understand what I mean. I have some question (imagine we want to sync DB records): Every user has a part of server space for himself (such as Evernote or Dropbox ). Maybe the user creates new records by cellphone and creates new records in server. How can I match these records together? If there are records with same ID What algorithms do you suggest me? Except JSON , Are there any way for send data between cellphone device and server? If

Sync data between Android App and webserver [closed]

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问题 I want to sync data (such as db record, media) between an Android App and a Server. If you\'ve seen Evernote or similar Applications, you certainly understand what I mean. I have some question (imagine we want to sync DB records): Every user has a part of server space for himself (such as Evernote or Dropbox ). Maybe the user creates new records by cellphone and creates new records in server. How can I match these records together? If there are records with same ID What algorithms do you

Using special auto start servlet to initialize on startup and share application data

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问题 I need to get some configuration and connect to external resources/objects/systems somewhere and store it in application scope. I can see two ways to setup my application: Overriding the init() in the existing servlets and required code there and keeping all constructed objects inside that same servlet. Having some kind of an initialisation servlet and using its init() to do the work. Then storing created objects in ServletContext to share it with my other servlets. Which out of above is