限制ContentResolver.query（）函數中的行數

Question

有沒有辦法將返回的行數限制爲遊標？ 我有一個約4000個聯繫人的電話，我只需要其中的一部分。

這是我使用

 db = new dBHelper(this); 
     ContentResolver cr = getContentResolver(); 
     Cursor cursor; 

     cursor = cr.query(ContactsContract.Contacts.CONTENT_URI,null, null, null, ContactName + " ASC"); 
     Log.i(TAG, CLASSNAME + " got contacts entries"); 
     for (int it = 0; it <100 ; it++){//cursor.getCount() 
      Log.i(TAG, CLASSNAME + " getting string"); 
      String mytimes_contacted = cursor.getString(cursor.getColumnIndex(dBHelper.times_contacted)); 
      Log.i(TAG, CLASSNAME + " done from the string"); 
     } 

我得到的日誌是

I/Check(11506): [ContactsPicker] got contacts entries 
I/Check(11506): [ContactsPicker] getting first string 
D/AndroidRuntime(11506): Shutting down VM 
W/dalvikvm(11506): threadid=1: thread exiting with uncaught exception (group=0x2aac8578) 
D/dalvikvm(11541): GC_CONCURRENT freed 923K, 46% free 4000K/7303K, external 1685K/2133K, paused 1ms+8ms 
E/AndroidRuntime(11506): FATAL EXCEPTION: main 
E/AndroidRuntime(11506): java.lang.RuntimeException: Unable to start activity ComponentInfo{~~my package name~~}: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 3537 

Answer 1

要限制你的光標試結果的數量的代碼：

cursor = cr.query(ContactsContract.Contacts.CONTENT_URI,null, null, null, ContactName + " LIMIT 100"); 
while(cursor.moveToNext()) { 
    // something clever 
}