android-contentprovider

Custom ContentProvider - openInputStream(), openOutputStream()

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问题 The content provider/ resolver APIs provide a complicated, but robust way of transferring data between processes using a URI and the openInputStream() and openOutputStream() methods. Custom content providers have the ability to override the openFile() method with custom code to effectively resolve a URI into a Stream ; however, the method signature of openFile() has a ParcelFileDescriptor return type and it is not clear how one might generate a proper representation for dynamically generated

Android/SQLite: Insert-Update table columns to keep the identifier

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问题 Currently, I am using the following statement to create a table in an SQLite database on an Android device. CREATE TABLE IF NOT EXISTS 'locations' ( '_id' INTEGER PRIMARY KEY AUTOINCREMENT, 'name' TEXT, 'latitude' REAL, 'longitude' REAL, UNIQUE ( 'latitude', 'longitude' ) ON CONFLICT REPLACE ); The conflict-clause at the end causes that rows are dropped when new inserts are done that come with the same coordinates. The SQLite documentation contains further information about the conflict

How do I get the _count in my content provider?

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问题 What should I do to get my content provider to return the _count column with the count of records? The documentation says it is automatic, but maybe it's only taking about some built-in content provider. Running a query to the database seems not to return it. 回答1: If you are using ContentProvider.query() a Cursor is returned. Call Cursor.getCount() to get a count of records in the returned cursor. 回答2: If you are using contentProvider then you have to do it like count(*) AS count . If you use

Android ContentProvider database query multiple tables

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问题 I'm writing an RSS reader for Android. I've faced a certain difficulty which the problem I can't resolve since databases aren't my expertise.. So i figured out maybe one of you could help me out! I currently have 3 tables (Categories, links and feeds). My goal is too link a feed to multiple categories. Therefor I'm using a Link table. My databases is an Android ContentProvider (sqlite) and looks like the following: | Categories | | Links | | Feeds | |------------| |---------| |-------| | _ID

How to get whatsapp Contacts from Android?

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I have try to get whatsapp contact from phone and i get total Count of whatsapp contact but from RawContacts how to get whatsapp Number and name that i don't know. i have tried to find solution but can't get exact solution for that. Please help me. I put my code below. ContentResolver cr = context.getContentResolver(); Cursor c = cr.query( ContactsContract.RawContacts.CONTENT_URI, new String[] { ContactsContract.RawContacts.CONTACT_ID, ContactsContract.RawContacts.DISPLAY_NAME_PRIMARY }, ContactsContract.RawContacts.ACCOUNT_TYPE + "= ?", new String[] { "com.whatsapp" }, null); ArrayList<String

How to query Android MediaStore Content Provider, avoiding orphaned images?

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I'm trying to provide an in-app Activity which displays thumbnails of photos in the device's media store, and allow the user to select one. After the user makes a selection, the application reads the original full-size image and does things with it. I'm using the following code to create a Cursor over all the images on the external storage: public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView( R.layout.image_select ); mGridView = (GridView) findViewById( R.id.image_select_grid ); // Query for all images on external storage String[] projection = {

Is it possible to access resources in another APK without using content providers?

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问题 I thought that it is impossible to access resources contained in other APK unless content providers are used. However, I stumbled upon an app called Better Keyboard. It uses skins, so I decided to download an example of a skin. An example skin really surprised me. It contains almost no code, declares only an activity and no content providers. Nontheless it contains resources and they are apparently somehow accessed from Better Keyboard app if the APK with the skin gets installed. So how is it

Android: SQLite transactions when using ContentResolver

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问题 The goal: refresh database from XML data The process: Start transaction Delete all existing rows from the tables Per each main element of parsed XML insert row into main table and get PK Per each child of the main element insert record into 2nd table providing FK from the previous step Commit transaction Pretty standard stuff as far as db operations. The problem is that CRUD operations are not done within ContentProvider but rather using ContentResolver so the insert for example looks like

How do I use the Android SyncAdapter?

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问题 I try to understand the Android synchronization logic. What I don't understand is the file syncadapter.xml contained in the Android SDK sample project SampleSyncAdapter . If you downloaded the SDK samples it should be in the following folder: SDK/android-sdk-PLATFORM/samples/android-VERSION/SampleSyncAdapter/res/xml/syncadapter.xml I read, the authority of a content provider should be a string or a reference to a resource. What exactly is the content authority and where is com.android

What is the use of private Content Providers?

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问题 The Android Dev Guide says Content providers are also useful for reading and writing data that is private to your application and not shared. Generally, Content Providers are used for providing data to different applications or sharing data among them. I was wondering if there is any use to having private providers and not wanting to share it. Are there any benefits provided that a direct access to DB or file system don't provide? Thanks, Rajath 回答1: It automatically schedules all your server