请问一下大牛！有关于android 通过电话号码查询通讯录的有关问题

 private void getContactPeople(String incomingNumber)    {        myTextView1.setTextColor(Color.BLUE);        ContentResolver contentResolver = getContentResolver();        Cursor cursor = null;                String[] projection = new String[]        {            ContactsContract.Contacts._ID,            ContactsContract.Contacts.DISPLAY_NAME,            ContactsContract.CommonDataKinds.Phone.NUMBER        };        cursor = contentResolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, projection,         ContactsContract.CommonDataKinds.Phone.NUMBER + "=?", new String[]        { incomingNumber }, "");        if(cursor.getCount() == 0)        {            myTextView1.setText("unknown Number:" + incomingNumber);        }        else if (cursor.getCount() > 0)        {            cursor.moveToFirst();            String name = cursor.getString(1);            myTextView1.setText(name + ":" + incomingNumber);        }    }