Question

初学者！

所以我需要帮助将已解析的RSS提要保存到数据库中，以便以后离线查看。

我正在使用SAXParser解析RSS，然后在ListView中显示它。我已经设法创建工作数据库，但我不知道如何将解析的字符串添加到数据库。我应该在解析之后还是在显示ListView之后立即使用它？

我的项目基于http://www.itcuties.com/android/how-to-write-android-rss-parser/ RSS解析器示例。

示例代码将不胜感激。

提前谢谢！

编辑：我的主要活动AsyncTask：

private class GetRSSDataTask extends AsyncTask<String, Void, List<RssItem> > {
    @Override
    protected List<RssItem> doInBackground(String... urls) {


        try {
            // Create RSS reader
            RssReader rssReader = new RssReader(urls[0]);

            // Parse RSS, get items
            return rssReader.getItems();

        } catch (Exception e) {
            Log.e("RssParser", e.getMessage());
        }


        return null;
    }

    @Override
    protected void onPostExecute(List<RssItem> result) {


        RssItem item = new RssItem();

        db.open();
        //do something by database
        db.insertNewsInfo(item);
        Log.i("String", item.toString());
        db.close();


        // Get a ListView from main view
        ListView itcItems = (ListView) findViewById(R.id.listView);

        // Create a list adapter
        ArrayAdapter<RssItem> adapter = new ArrayAdapter<RssItem>(local,android.R.layout.simple_list_item_1, result);
        // Set list adapter for the ListView
        itcItems.setAdapter(adapter);

        // Set list view item click listener
        itcItems.setOnItemClickListener(new ListListener(result, local));


    }
}

Answer 1

对于Ex：您被解析为新闻网站
你可以上课NewsInformation.java

public class NewsInformation {

public String completeTextLink;
public String title;
public String writerName;
public String dateWriten;
public String source;
public String smallBody;
public String bigBody;  
public String page;

}

通过使用上面的类将您的新闻插入数据库
DatabaseHelper.java

public class DatabaseHelper extends SQLiteOpenHelper {

private final String TAG = "DatabaseHelper";
private static final String DATABASE_NAME = "db_for_news";


public DatabaseHelper(Context context) {
    super(context, DATABASE_NAME, null, 10);

    //fdd
    Log.i(TAG, "Object created.");
}

@Override
public void onCreate(SQLiteDatabase db) {

    db.execSQL("CREATE TABLE news ( page TEXT ," +
            " completeTextLink TEXT  ,title TEXT , writerName TEXT , dateWriten TEXT ," +
            " source TEXT ,  smallBody TEXT , bigBody TEXT);");


}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    Log.w(DatabaseHelper.class.getName(), "Upgrading database from version "
            + oldVersion + " to " + newVersion + ", which will destroy all old data");
    db.execSQL("Drop table if exists news" );


    onCreate(db);
}

}

DatabaseHandler.java

中的

public class DatabaseHandler {

private DatabaseHelper dbHelper;
private SQLiteDatabase database;



//methods for all table

public DatabaseHandler(Context context) {
    dbHelper = new DatabaseHelper(context);

}

public void open() throws SQLException {
    database = dbHelper.getWritableDatabase();
}

public void close() {
    dbHelper.close();
}

public void clearTable(String tableName) {
    database.delete( tableName, null, null);
}


//news table method

public void insertNewsInfo(NewsInformation newsInfo) {
    ContentValues cv = new ContentValues();


    cv.put("bigBody"          ,  newsInfo.bigBody );
    cv.put("completeTextLink" ,  newsInfo.completeTextLink );
    cv.put("dateWriten"       ,  newsInfo.dateWriten );
    cv.put("source"            ,  newsInfo.source );
    cv.put("smallBody"        ,  newsInfo.smallBody );
    cv.put("title"            ,  newsInfo.title );
    cv.put("writerName"       ,  newsInfo.writerName );
    cv.put("page"             ,  newsInfo.page );

    database.insert("news" , "writerName", cv);
}


public List<NewsInformation> getAllNewsForPage(String page) {   
    List<NewsInformation> NewsInfoList = new ArrayList<NewsInformation>();

    Cursor cursor = database.rawQuery("select completeTextLink " +
            " , title , writerName , dateWriten , source , smallBody , bigBody" +
            " FROM news where page = ?", new String[]{page});


    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        NewsInformation newsInfo = new NewsInformation();

        newsInfo.completeTextLink = cursor.getString(0);
        newsInfo.title = cursor.getString(1);
        newsInfo.writerName = cursor.getString(2);
        newsInfo.dateWriten = cursor.getString(3);
        newsInfo.source = cursor.getString(4);
        newsInfo.smallBody = cursor.getString(5);
        newsInfo.bigBody = cursor.getString(6);
        newsInfo.page = page;


        NewsInfoList.add(newsInfo);
        cursor.moveToNext();
    }
    // Make sure to close the cursor
    cursor.close();

    return NewsInfoList;
}

public String getBigBody(String completeBodyLink)
{
    Cursor cursor = database.rawQuery("select bigBody FROM news where completeTextLink = ?", new String[]{completeBodyLink});
    cursor.moveToFirst();

    return cursor.getString(0);
}   

}

在您的活动中保存到DataBase

IN DATA >>private NewsDatabaseHandler    db;
IN onCreat()>> db = new NewsDatabaseHandler(this);
//Where you want insert to database or read from it
db.open();
//do something by database
//for Ex:
NewsInformation item = new NewsInformation();
item.completeTextLink = "Your Link of news";
item.title            = "title of news";
item.writerName       = "writer of news";
item.dataWriten       = "1999";
item.source           = "something";
item.smallBody        = "news body";
item.bigBody          = "news text";
item.page             = "1";
db.insertNewsInfo(item);
db.close();

Answer 2

听起来你已经成功解析了RSS。接下来的步骤是：

1）将解析后的数据转换为java对象 2）坚持对象

对于第1步，如果您使用链接中的示例代码，则已经完成了此操作。 E.g：

public class RssItem {
    // item title
    private String title;
    // item link
    private String link;
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getLink() {
        return link;
    }
    public void setLink(String link) {
        this.link = link;
    }
    @Override
    public String toString() {
        return title;
    }
}

此java对象表示要保留的数据。下一步是将ORM库集成到您的项目中。通常，最常见的是ORMlite。要使用它：

在项目中包含ormlite-android-4.47.jar和ormlite-core-4.47.jar在libs中
为您的班级like this
将项目保留到数据库

以下是一个例子：

Dao<RssItem, String> rssDao = DaoManager.createDao(connectionSource, RssItem.class);
TableUtils.createTable(connectionSource, RssItem.class);

// create an instance of RssItem
RssItem item = new RssItem();
item.setTitle("News Item A");

// persist the item object to the database
rssDao.create(item);

这是ORM持久性的基础知识。一旦你坚持下去，你也可以使用DAO进行查询。

如何在Android中将解析的rs保存到数据库

2 个答案: