androidのデータベースとContent Provider(三)

public Loader<Cursor> onCreateLoader(int id, Bundle args) { 
   // Construct the new query in the form of a Cursor Loader. Use the id 
   // parameter to construct and return different loaders. 
   String[] projection = null;


  String where = null; 
  String[] whereArgs = null; 
  String sortOrder = null;

  // Query URI 
  Uri queryUri = MyContentProvider.CONTENT_URI;

  // Create the new Cursor loader. 
  return new CursorLoader(DatabaseSkeletonActivity.this, queryUri, 
     projection, where, whereArgs, sortOrder); 
}

public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { 
  // Replace the result Cursor displayed by the Cursor Adapter with 
  // the new result set. 
  adapter.swapCursor(cursor);

  // This handler is not synchronized with the UI thread, so you 
  // will need to synchronize it before modifying any UI elements 
  // directly. 
}

public void onLoaderReset(Loader<Cursor> loader) { 
  // Remove the existing result Cursor from the List Adapter. 
  adapter.swapCursor(null);

  // This handler is not synchronized with the UI thread, so you 
  // will need to synchronize it before modifying any UI elements 
  // directly. 
}

 

// Create a new row of values to insert. 
ContentValues newValues = new ContentValues();

// Assign values for each row. 
newValues.put(MyHoardContentProvider.KEY_GOLD_HOARD_NAME_COLUMN,  
            hoardName); 
newValues.put(MyHoardContentProvider.KEY_GOLD_HOARDED_COLUMN,  
            hoardValue); 
newValues.put(MyHoardContentProvider.KEY_GOLD_HOARD_ACCESSIBLE_COLUMN,  
            hoardAccessible); 
// [ ... Repeat for each column / value pair ... ]

// Get the Content Resolver 
ContentResolver cr = getContentResolver();

// Insert the row into your table 
Uri myRowUri = cr.insert(MyHoardContentProvider.CONTENT_URI, 
                                         newValues);

// Specify a where clause that determines which row(s) to delete. 
// Specify where arguments as necessary. 
String where = MyHoardContentProvider.KEY_GOLD_HOARDED_COLUMN + 
                   “=” + 0; 
String whereArgs[] = null;

// Get the Content Resolver. 
ContentResolver cr = getContentResolver();

// Delete the matching rows 
int deletedRowCount = 
   cr.delete(MyHoardContentProvider.CONTENT_URI, where, whereArgs);

// Create the updated row content, assigning values for each row.  
ContentValues updatedValues = new ContentValues(); 
updatedValues.put(MyHoardContentProvider.KEY_GOLD_HOARDED_COLUMN, 
                             newHoardValue); 
// [ ... Repeat for each column to update ... ]

// Create a URI addressing a specific row. 
Uri rowURI =  
      ContentUris.withAppendedId(MyHoardContentProvider.CONTENT_URI, 
          hoardId);

// Specify a specific row so no selection clause is required. 
String where = null; 
String whereArgs[] = null;            

// Get the Content Resolver. 
ContentResolver cr = getContentResolver();

// Update the specified row. 
int updatedRowCount = 
  cr.update(rowURI, updatedValues, where, whereArgs);

 

public void addNewHoardWithImage(String hoardName, float hoardValue, 
           boolean hoardAccessible, Bitmap bitmap) {

           // Create a new row of values to insert. 
           ContentValues newValues = new ContentValues();

           // Assign values for each row. 
           newValues.put(MyHoardContentProvider.KEY_GOLD_HOARD_NAME_COLUMN, 
                            hoardName); 
           newValues.put(MyHoardContentProvider.KEY_GOLD_HOARDED_COLUMN, 
                            hoardValue); 
           newValues.put( 
             MyHoardContentProvider.KEY_GOLD_HOARD_ACCESSIBLE_COLUMN, 
             hoardAccessible);

           // Get the Content Resolver 
           ContentResolver cr = getContentResolver();

           // Insert the row into your table 
           Uri myRowUri = 
             cr.insert(MyHoardContentProvider.CONTENT_URI, newValues);

           try { 
             // Open an output stream using the new row’s URI. 
             OutputStream outStream = cr.openOutputStream(myRowUri); 
             // Compress your bitmap and save it into your provider.


     bitmap.compress(Bitmap.CompressFormat.JPEG, 80, outStream); 
   } 
   catch (FileNotFoundException e) { 
     Log.d(TAG, “No file found for this record.”); 
   } 
}

public Bitmap getHoardImage(long rowId) { 
   Uri myRowUri = 
     ContentUris.withAppendedId(MyHoardContentProvider.CONTENT_URI, 
                                      rowId);

   try { 
     // Open an input stream using the new row’s URI. 
     InputStream inStream = 
        getContentResolver().openInputStream(myRowUri);

     // Make a copy of the Bitmap. 
     Bitmap bitmap = BitmapFactory.decodeStream(inStream); 
     return bitmap; 
   } 
     catch (FileNotFoundException e) { 
     Log.d(TAG, “No file found for this record.”); 
   }

   return null; 
}