檢查android聯系人列表中是否存在電話號碼

Question

我試圖檢查聯系人列表中存在的號碼，我使用下面的代碼，但我總是在這一行出錯

 Cursor cur = this.getContentResolver().query(lookupUri,mPhoneNumberProjection, null, null, null);

任何人都可以幫我找出問題，我已經允許在清單中閱讀我的聯系人

  public String getContactName(String number)
{
    String name = null;
    Uri lookupUri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(number));
    String[] mPhoneNumberProjection = { PhoneLookup._ID, PhoneLookup.NUMBER, PhoneLookup.DISPLAY_NAME };
    Cursor cur = this.getContentResolver().query(lookupUri,mPhoneNumberProjection, null, null, null);
    try 
    {
       if (cur.moveToFirst())
       {
           name = cur.getString(cur.getColumnIndex(PhoneLookup.DISPLAY_NAME));
           return name;
       }
    }
    finally 
    {
    if (cur != null)
       cur.close();
    }
    return "unknown number";
}

這是我的錯誤日志！

Answer 1

試試這個代碼：（使用上下文）

public boolean contactExists(Context context, String number) {
    /// number is the phone number
    Uri lookupUri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(number));
    String[] mPhoneNumberProjection = { PhoneLookup._ID, PhoneLookup.NUMBER, PhoneLookup.DISPLAY_NAME };
    Cursor cur = context.getContentResolver().query(lookupUri,mPhoneNumberProjection, null, null, null);
    try {
        if (cur.moveToFirst()) {
            return true;
        }
    }
    finally {
        if (cur != null){
            cur.close();
        }
        return false;
    }
}

Answer 2

這個對我有用。 處理空指針異常。

public boolean contactExists(Context context, String number) {
    if (number != null) {
        ContentResolver cr = context.getContentResolver();
        Cursor curContacts = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);

        while (curContacts.moveToNext()) {
            String contactNumber = curContacts.getString(curContacts.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
            if (number.equals(contactNumber)) {
                return true;
            }
        }
        return false;
    } else {
        return false;
    }
}