java - 如何将光标(android)放入二维数组？

Question

我有这个:

String [][] population = new String[indexOfChromosomes][indexOfGens];

for(int chromosomesNumber = 0; chromosomesNumber <= indexOfChromosomes ; chromosomesNumber++){
  for(int gensNumber = 0; gensNumber <= indexOfGens ; gensNumber++){
    Cursor r = db.rawQuery("SELECT _id, key_foodstuff, key_calorie, key_carbohydrate, key_fat, 
      key_protein FROM (food INNER JOIN categories ON food.key_nocategory = 
      categories.nocategories) WHERE key_type='primary' 
      AND _id!=164 ORDER BY RANDOM() LIMIT 1", null);       

      if(r.moveToFirst()){              
       population[indexOfChromosomes][indexOfGens] = r.getString(0);
      }
   }
}

当我运行此代码时出现错误: 人口[indexOfChromosomes][indexOfGens] = r.getString(0);

我想问，如何将光标 r 放在二维数组上？谢谢

Answer 1

看起来错误在这里:

String [][] population = new String[indexOfChromosomes][indexOfGens];

for(int chromosomesNumber = 0; chromosomesNumber <= indexOfChromosomes ; chromosomesNumber++){
    for(int gensNumber = 0; gensNumber <= indexOfGens ; gensNumber++){

数组的大小为 indexOfChromosomes x indexOfGens，因此它的索引为 0..indexOfChromosomes-1 和 0.. indexOfGens-1，当您尝试访问索引 indexOfChromosomes 和 indexOfGens 时。

应该是

for(int chromosomesNumber = 0; chromosomesNumber < indexOfChromosomes ; chromosomesNumber++){
    for(int gensNumber = 0; gensNumber < indexOfGens ; gensNumber++){