如何從包括圖像規格的可繪製圖像檢索圖像並將其顯示到ListView中

Question

我有可繪製的圖像和具有列名稱的數據庫，如price和imageName ...所以我想檢索所有imageNames列表並顯示與數據庫中的其他領域......所以在這裏我已經嘗試了現在一個ListView對應的圖像一起..

//getting a list of names from database 

public List<String> populateList(){ 
     List<String> ItemsList = new ArrayList<String>(); 
     DatabaseHelper openHelper = new DatabaseHelper(this); 
     SQLiteDatabase sqliteDatabase = openHelper.getReadableDatabase(); 

     // We need a a guy to read the database query. Cursor interface will do it for us 
       //(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy) 
       Cursor cursor = sqliteDatabase.query(DBAdapter.ITEMS_TABLE, null, null, null, null, null, null); 
       // Above given query, read all the columns and fields of the table 

       startManagingCursor(cursor); 

       while (cursor.moveToNext()) { 
        // In one loop, cursor read one undergraduate all details 
        // Assume, we also need to see all the details of each and every undergraduate 
        // What we have to do is in each loop, read all the values, pass them to the POJO class 
        //and create a ArrayList of undergraduates 

        String BName = cursor.getString(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_NAME)); 
        String Bauthor = cursor.getString(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_AUTHOR)); 
        String Bgenre = cursor.getString(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_GENRE)); 
        String Bpublisher = cursor.getString(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_PUBLISHER)); 
        String Bcover = cursor.getString(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_COVER_TYPE)); 
        int Bpages = cursor.getInt(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_NUM_PAGES)); 
        int Bage = cursor.getInt(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_AGE_RESTRICTION)); 
        int Bqty = cursor.getInt(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_QUANTITY)); 
        double Bprice = cursor.getDouble(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_PRICE)); 
        String Bimage = cursor.getString(cursor.getColumnIndex(DBAdapter.COLUMN_BOOK_IMAGE)); 
        //String uHaddress = cursor.getString(cursor.getColumnIndex(DBAdapter.COLUMN_ADDRESS)); 
        //double ugGpa = cursor.getDouble(cursor.getColumnIndex(AndroidOpenDbHelper.COLLUMN_NAME_UNDERGRADUATE_GPA)); 

        // Finish reading one raw, now we have to pass them to the POJO 
        BooksPojo uPojoClass = new BooksPojo(BName, Bauthor, Bgenre, Bpublisher, Bcover, Bpages, Bage, Bqty, Bprice, Bimage); 


        // Lets pass that POJO to our ArrayList which contains undergraduates as type 
        pojoArrayList.add(uPojoClass); 

        // But we need a List of String to display in the ListView also. 
        //That is why we create "uGraduateNamesList" 
        ItemsList.add(Bimage); 
       } 

       // If you don't close the database, you will get an error 
       sqliteDatabase.close(); 
    return ItemsList; 
    } 

Answer 1

如果您存儲在數據庫中你繪製的名字，你可以使用然後檢索ID getIdentifier然後，您可以將ID傳遞給getDrawable，這將得到可用於您的ImageView的drawable。

爲了將所有這些數據輸入到您的ListView中，您應該使用ListAdapater。 SimpleCursorAdapter可能會最適合您的需求。