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);
        }
    }