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您好，当我在模拟器上运行我的应用程序时，我遇到了一个奇怪的问题，它工作正常，并在列表视图中显示数据库中的所有公司名称，但是当我在真实设备上运行它时，数据库变为空且没有行。（光标.getCount()returns 0 ) .. 我不知道为什么会这样！？提前致谢

我的日志猫：

06-15 18:56:23.031: D/dalvikvm(9213): GC_FOR_ALLOC freed 77K, 3% free 12870K/13191K, paused 30ms
06-15 18:56:23.066: D/dalvikvm(9213): GC_FOR_ALLOC freed 109K, 4% free 12954K/13447K, paused 26ms
06-15 18:56:23.066: I/dalvikvm-heap(9213): Grow heap (frag case) to 13.093MB for 262160-byte allocation
06-15 18:56:23.086: D/dalvikvm(9213): GC_FOR_ALLOC freed <1K, 5% free 13210K/13767K, paused 13ms
06-15 18:56:23.106: D/dalvikvm(9213): GC_FOR_ALLOC freed 0K, 5% free 13210K/13767K, paused 17ms
06-15 18:56:23.106: I/dalvikvm-heap(9213): Grow heap (frag case) to 13.537MB for 465140-byte allocation
06-15 18:56:23.126: D/dalvikvm(9213): GC_CONCURRENT freed 0K, 5% free 13664K/14279K, paused 1ms+1ms
06-15 18:56:23.161: D/dalvikvm(9213): GC_FOR_ALLOC freed 256K, 7% free 13409K/14279K, paused 13ms
06-15 18:56:23.161: I/dalvikvm-heap(9213): Grow heap (frag case) to 13.743MB for 476816-byte allocation
06-15 18:56:23.181: D/dalvikvm(9213): GC_CONCURRENT freed <1K, 7% free 13875K/14791K, paused 1ms+1ms
06-15 18:56:23.261: D/dalvikvm(9213): GC_FOR_ALLOC freed 0K, 7% free 13875K/14791K, paused 32ms
06-15 18:56:23.261: I/dalvikvm-heap(9213): Grow heap (frag case) to 14.550MB for 846420-byte allocation
06-15 18:56:23.286: D/dalvikvm(9213): GC_CONCURRENT freed 0K, 6% free 14702K/15623K, paused 2ms+1ms
06-15 18:56:23.616: D/CLIPBOARD(9213): Hide Clipboard dialog at Starting input: finished by someone else... !
06-15 18:56:36.801: E/yallaaaaaaaaaaaa(9213): 0
06-15 18:56:36.801: I/System.out(9213): count0
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1 回答 1

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well sometime ago i too faced a similar problem..

create a temporary table say temp and insert rows into it from another table.

public void populate_temp() 
{

dbsqlite.execSQL("delete from temp");
dbsqlite.execSQL(" insert into temp(name) select city from City ORDER BY city ASC ");

}

then populate a list by retrieveing values from the temporary table

public List<String> getAllLabels() 
{
    List<String> labels = new ArrayList<String>();
    String selectQuery = "select DISTINCT name from temp";
    dbsqlite = this.getReadableDatabase();
    Cursor cursor = dbsqlite.rawQuery(selectQuery, null);

    if (cursor.moveToFirst()) {
        do {
             labels.add(cursor.getString(cursor.getColumnIndex("name")));

        } while (cursor.moveToNext());
    }

    cursor.close();
    dbsqlite.close();

    return labels;
}

this may not be a good programming practice but works just fine! ;)

于 2013-06-15T18:22:39.873 回答