android-contentprovider

问题 What is the difference between ContentProviders and ContentResolver ? I do not want for the SQLite database. I am developing an application for media. 回答1: I found some explanation here. In summary Content Resolver resolves a URI to a specific Content provider . Content Provider provides an interface to query content. The way to query a content provider is contentResolverInstance.query(URI,.....) 回答2: ContentProviders are used to abstract the database from other parts and acts as an interface

问题 What is the difference between ContentProviders and ContentResolver ? I do not want for the SQLite database. I am developing an application for media. 回答1: I found some explanation here. In summary Content Resolver resolves a URI to a specific Content provider . Content Provider provides an interface to query content. The way to query a content provider is contentResolverInstance.query(URI,.....) 回答2: ContentProviders are used to abstract the database from other parts and acts as an interface

问题 I need to make a ListAdapter that presents data from multiple ContentProviders. The ContentProviders themselves represent one table each from relational database. I want to use the CursorLoader system to retrieve aggregate data into ListView. Is this possible to do with 1 loader or do I need to use multiple loaders? I'd prefer to use one. I'm not sure how I can have 2 ContentProviders interact with each other beyond doing the join manually in code which doesn't seem like a great option either

问题 I need to make a ListAdapter that presents data from multiple ContentProviders. The ContentProviders themselves represent one table each from relational database. I want to use the CursorLoader system to retrieve aggregate data into ListView. Is this possible to do with 1 loader or do I need to use multiple loaders? I'd prefer to use one. I'm not sure how I can have 2 ContentProviders interact with each other beyond doing the join manually in code which doesn't seem like a great option either

问题 Uri uri = MediaStore.Audio.Artists.Albums.getContentUri("external", artistId); String[] projection = new String[] {BaseColumns._ID}; Cursor cursor = mContext.getApplicationContext().getContentResolver().query (uri, projection, null, null, null); Prior to Android 10, BaseColumns._ID was returning album_id and now in 10, it returns some random Id. When I passed projection as null and retrieved all column names below are the column name that I get. This is in Android 10. [numsongs, artist,

问题 EDIT: I suspect this is resulting from a bug in my HTC sense UI. I would also accept an answer allowing me to test this theory without losing any phone data (i.e. hard reset or otherwise). The phone is an HTC Incredible running Froyo 2.2. I'm trying to insert a large batch of contacts (parsed into an object through XML, but basically from a custom Object) and I'm having the above problem. Contacts are adding just fine (to the "com.google" account), but for each contact added, there is a

问题 I get this error everytime I try to use my content provider to insert a URI. Here is the method: private void sample() { ContentValues values; values = new ContentValues(); values.put(Formulas.TITLE, "Formula1"); values.put(Formulas.FORMULA, "someformula"); getContentResolver().insert(getIntent().getData(), values); values = new ContentValues(); values.put(Formulas.TITLE, "Formula2"); values.put(Formulas.FORMULA, "someformula"); getContentResolver().insert(getIntent().getData(), values);

问题 I have implemented a Content Provider, it is resulting in following error 04-25 00:25:16.856: E/AndroidRuntime(520): Caused by: android.database.sqlite.SQLiteException: bind or column index out of range: handle 0x234590 The query in Content Provider is Cursor cursor = qb.query(db, projection, selection, selectionArgs, null, null, sortOrder); and call to Content Provider is cursor = cr.query(uri, new String[] { ContactTableMetaData.ABC, ContactTableMetaData.MNP }, ContactTableMetaData.XYZ + "=

问题 is there any way how to take advantage of ContentProvider to check, whether my Android phone is connected to the internet? Thanks 回答1: // check internet connectivity public static boolean isNetworkAvailable(Context context) { boolean networkStatus; try { ConnectivityManager connectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetworkInfo = connectivityManager .getActiveNetworkInfo(); networkStatus = (activeNetworkInfo != null &

问题 I have made an app in which i am successfully downloading pdf files from internet by URL. And sotre them to the app's internal storage with making a folder app_Pdf. But now I want to open that file with third party app like adobe pdf viewer...ect. I have tried so many way, i have goggling much for this issue. I have also read about making first content provider and serve pdf file by this questing : How to open a PDF stored in Internal Memory but i get the error : invalid path.... Please any