Android Open Source - SimpleReader R S S Feed Category Provider

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License

The source code is released under:
Apache License
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Java Source Code

package com.dreamteam.app.db.provider;
//w ww .  j  a  v  a  2 s  .  co  m
import com.dreamteam.app.db.DbManager;

import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.text.TextUtils;

public class RSSFeedCategoryProvider extends ContentProvider {
  public static final Uri CONTENT_URI = Uri.parse(
      "content://com.dreateam.app.ui.provider.category/categories");
  
  public static final String KEY_ID = "id";
  public static final String KEY_TITLE = "title";
  public static final String KEY_TABLE = "tname";
  public static final String KEY_DESCRIPTION = "description";
  public static final String KEY_IMAGEURL = "imag_url";
  
  public static final int ALLROWS = 1;
  public static final int SINGLE_ROW = 2;
  private static final UriMatcher uriMatcher;
  
  private DbManager sqliteHelper;
  
  static {
    uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    uriMatcher.addURI("com.dreateam.app.ui.provider.category", "categories", ALLROWS);
    uriMatcher.addURI("com.dreateam.app.ui.provider.category", "categories/#", SINGLE_ROW);
  }
  
  @Override
  public boolean onCreate() {
    sqliteHelper = new DbManager(getContext(), DbManager.DB_NAME, 
        null, DbManager.DB_VERSION);
    return true;
  }

  @Override
  public String getType(Uri uri) {
    switch (uriMatcher.match(uri)) {
    case ALLROWS:
      return "vnd.android.cursor.dir/categories";
    case SINGLE_ROW:
      return "vnd.android.cursor.item/categories";
    default:
      throw new IllegalArgumentException("unsupport privider url");
    }
  }

  @Override
  public Cursor query(Uri uri, String[] projection, String selection,
      String[] selectionArgs, String sortOrder) {
    
    SQLiteDatabase db = sqliteHelper.getReadableDatabase();
    
    String groupBy = null;
    String having = null;
    
    SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
    queryBuilder.setTables(DbManager.RSS_CATEGORY_TABLE_NAME);
    
    switch(uriMatcher.match(uri)) {
      case SINGLE_ROW :
        //String rowId = uri.getPathSegments().get(1);
        long rowId = ContentUris.parseId(uri);
        queryBuilder.appendWhere(KEY_ID + "=" + rowId);
        break;
      default :
        break;
    }
    
    Cursor cursor = queryBuilder.query(db, projection, selection, selectionArgs, groupBy, 
        having, sortOrder);
    
    return cursor;
  }
  
  @Override
  public Uri insert(Uri uri, ContentValues values) {
    SQLiteDatabase db = sqliteHelper.getWritableDatabase();
    
    String nullColumnHack = null;
    
    long id = db.insert(DbManager.RSS_CATEGORY_TABLE_NAME, nullColumnHack, values);
    
    if(id > -1) {
      Uri insertedUri = ContentUris.withAppendedId(CONTENT_URI, id);
      
      getContext().getContentResolver().notifyChange(insertedUri, null);
      
      return insertedUri;
    }
    
    return null;
  }

  @Override
  public int delete(Uri uri, String selection, String[] selectionArgs) {
    SQLiteDatabase db = sqliteHelper.getWritableDatabase();
    
    switch(uriMatcher.match(uri)) {
    case SINGLE_ROW :
      // String rowId = uri.getPathSegments().get(1);
      
      long rowId = ContentUris.parseId(uri);
      
      selection = KEY_ID + "=" + rowId + (TextUtils.isEmpty(selection) ? "" : " and (" + selection + ")");
    default :
      break;
    }
    
    if(selection == null) {
      selection = "1";
    }
    
    int deleteCount = db.delete(DbManager.RSS_CATEGORY_TABLE_NAME, selection, selectionArgs);
    
    getContext().getContentResolver().notifyChange(uri, null);
    
    return deleteCount;
  }

  @Override
  public int update(Uri uri, ContentValues values, String selection,
      String[] selectionArgs) {
    SQLiteDatabase db = sqliteHelper.getWritableDatabase();
    
    switch(uriMatcher.match(uri)) {
    case SINGLE_ROW :
      String rowId = uri.getPathSegments().get(1);
      selection = KEY_ID + "=" + rowId + (TextUtils.isEmpty(selection) ? "" : " and (" + selection + ")");
    default :
      break;
    }
    
    int updateCount = db.update(DbManager.RSS_CATEGORY_TABLE_NAME, values, selection, selectionArgs);
    
    getContext().getContentResolver().notifyChange(uri, null);
    
    return updateCount;
  }
}
Java Source Code List
