ContentValues数组中的重复ContentValues

Question

对此有任何帮助,确定它是简单的但看不到它.

对内容提供程序(UserDictionary)执行bulkInsert,但所有插入都具有相同的"单词"值.问题是Array of ContentValues.这是我的一些测试代码:

  public void mClick(View v){

        int batchSize = 25;
        ContentValues[] mValueArray = new ContentValues[batchSize];
        List<ContentValues>mValueList = new ArrayList<ContentValues>();
        ContentValues mNewValues = new ContentValues();

        mNewValues.put(UserDictionary.Words.APP_ID, this.getPackageName());
        mNewValues.put(UserDictionary.Words.LOCALE, "en");
        mNewValues.put(UserDictionary.Words.FREQUENCY, "255");
        mNewValues.put(UserDictionary.Words.WORD, "WORD1");

        mValueList.add(mNewValues);

        mNewValues.put(UserDictionary.Words.APP_ID, this.getPackageName());
        mNewValues.put(UserDictionary.Words.LOCALE, "en");
        mNewValues.put(UserDictionary.Words.FREQUENCY, "255");
        mNewValues.put(UserDictionary.Words.WORD, "WORD2");

        mValueList.add(mNewValues);

        mValueArray = new ContentValues[mValueList.size()];
        mValueList.toArray(mValueArray); 

        Log.i(TAG,mValueList.toString());
        Log.i(TAG,mValueArray[0].toString());
        Log.i(TAG,mValueArray[1].toString());


    }

从日志中可以看出mValueArray有重复的值.

02-22 12:33:51.060: I/log(859): [appid=dictionary word=WORD2 frequency=255 locale=en, appid=dictionary word=WORD2 frequency=255 locale=en]
02-22 12:33:51.070: I/log(859): appid=dictionary word=WORD2 frequency=255 locale=en
02-22 12:33:51.070: I/log(859): appid=dictionary word=WORD2 frequency=255 locale=en

显然我在向数组添加值时做了一些不正确的事情.谁能帮我？谢谢

Answer 1

你正在修改同一个对象.这应该工作正常:

 public void mClick(View v){

        int batchSize = 25;
        ContentValues[] mValueArray = new ContentValues[batchSize];
        List<ContentValues>mValueList = new ArrayList<ContentValues>();
        ContentValues mNewValues = new ContentValues();

        mNewValues.put(UserDictionary.Words.APP_ID, this.getPackageName());
        mNewValues.put(UserDictionary.Words.LOCALE, "en");
        mNewValues.put(UserDictionary.Words.FREQUENCY, "255");
        mNewValues.put(UserDictionary.Words.WORD, "WORD1");

        mValueList.add(mNewValues);

        mNewValues = new ContentValues();
        mNewValues.put(UserDictionary.Words.APP_ID, this.getPackageName());
        mNewValues.put(UserDictionary.Words.LOCALE, "en");
        mNewValues.put(UserDictionary.Words.FREQUENCY, "255");
        mNewValues.put(UserDictionary.Words.WORD, "WORD2");

        mValueList.add(mNewValues);

        mValueArray = new ContentValues[mValueList.size()];
        mValueList.toArray(mValueArray); 

        Log.i(TAG,mValueList.toString());
        Log.i(TAG,mValueArray[0].toString());
        Log.i(TAG,mValueArray[1].toString());


    }

关于为什么你的代码不起作用的一些更多解释:当你使用add()时,你将在List中保存对象引用(指针).它不会复制对象.稍后修改同一个对象时,List中的引用仍然指向此引用,因此您也要修改该引用.您只有2个引用同一个对象.