android-contentprovider

问题 I am working with an app in with I am interacting with phone contacts. I want to add a new Contact to my phones Contacts List. I have tried the following code but it is not work: void addContact(Context ctx, PreviewContactModel model) { ArrayList<Contact_Model> contact_models = handler.getAllContacts(); Contact_Model contact_model = new Contact_Model(); ArrayList<ContentProviderOperation> contentProviderOperation = new ArrayList<>(); int rawContactID = Integer.parseInt(contact_models.get

问题 ContentProvided defined for synchronization is dummy (in accordance with this approach). 回答1: If API > 8, (95% of devices) use ContentResolver.addPeriodicSync() If API = 7, (5.5% of devices as of Mar 2102) create a service with a periodic timer callback, and call ContentResolver.requestSync() . API < 6 does not support syncAdapter, so no worries. 来源： https://stackoverflow.com/questions/5525593/how-to-define-frequency-of-syncadapter-updates-on-android

问题 I am wondering if Android's ContentResolver supports using SQL functions over the columns when you query a ContentProvider. Such as SQLite3 date functions, to get a specific date format, or datediff? What do you know about this? 回答1: No. Even if you find it works for some cases, you cannot assume it works across the board. ContentProvider is a facade. A given ContentProvider might use SQLite. It might use XML files. It might use JSON files. It might use CSV files. It might use some third

问题 I'm building a small application that I'd like to automatically update when new data arrives. From what I've read of the android documentation, I thought that because I'm using the newer techniques that a ContentObserver would be created in the background for me, and I would just get automatic calls to the Loader. If there's any more information that would be helpful, I'd be glad to add it, or to upload the complete project somewhere. Additionally, I'm targeting KitKat (sdk version 19).

问题 I am trying to make an android application that will identify how much time is left for a task to be completed. I have followed Vogella's tutorial, particularly this part http://www.vogella.com/articles/AndroidSQLite/article.html#todo to make a contentprovider and database. It populates a listview with two things, the name of the task and how many days are left (the latter is calculated when the user selects his end date in another activity). My app calcualtes the current date and subtracts

问题 What are advantages of using custom content provider? Why such content provider is superior of plain class that wraps SQL queries? 回答1: Content providers can be used from other processes and are required by some mechanisms on Android like the global search. There are also some classes available that help you deal with content providers that save you some of the hassle of manging memory. 回答2: Other apps will be able to access your data. You can wrap and abstract a lot of the query logic in

问题 As I understand from the docs, one SyncAdapter defined in a SyncService is limited to receive only one ContentProvider authority to work on. But, at the same time, it has access to ContentResolver which it allows to run queries on other ContentProviders as well. I don't understand this particular design concept if a developer is needed to provide a single content authority to SyncAdapter and nonetheless she is able to do whatever she wants on whatever ContentProvider she has access to. My

问题 I'm developing an Android app that is a gallery of images in which the images are downloaded from internet for display on the screen of smathphone. Images are displayed one at a time and the application has a button to share the image that is displayed. Following the directions I've found in some StackOverflow post which indicated that the right way to share an image was using a ContentProvider I have implemented the following code that works to share the images of certain applications (eg

问题 I'm trying to get a custom ContentProvider to show up under Data & synchronization, and I'm running into some problems. Namely, it's not showing up. The specifics: My AndroidManifest.xml has the provider and service: <provider android:name="BooksProvider" android:label="ClientName Books" android:authorities="com.clientname.reader.books" android:enabled="true" android:exported="true" android:syncable="true"> <grant-uri-permission android:pathPattern=".*" /> </provider> <service android:name="

问题 I'm trying to implement the second REST client model presented by Virgil Dobjanschi on this video: http://developer.android.com/videos/index.html#v=xHXn3Kg2IQE This is the high level diagram for the model I'm talking about: I implemented everything as suggested, but I have a complex SQLite database model with lots of tables and I need to use transactions to update my local data with brand new data retrieved from server (step 7 in the picture). Are there any suggestions you could make to help