startActivityForResult always return 0 when restor

This code working properly on lollypop version, But, when i use it on Kitkat, it always returns 0 when i choose "Yes/No" option from dialog.

btnSMSRestore.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
                if (currentapiVersion >= android.os.Build.VERSION_CODES.KITKAT){
                    defaultSmsApp = Telephony.Sms.getDefaultSmsPackage(SMSActivity.this);
                    if (!getPackageName().equals(defaultSmsApp))
                    {
                        Intent intent = new Intent(Telephony.Sms.Intents.ACTION_CHANGE_DEFAULT);
                        intent.putExtra(Telephony.Sms.Intents.EXTRA_PACKAGE_NAME, getPackageName());
                        //startActivity(intent);
                        startActivityForResult(intent, DEF_SMS_REQ);
                    }
                }
                else
                {
                    new RestoreSMS().execute();
                }
    });
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    switch (requestCode)
    {
        case DEF_SMS_REQ:           
            if(resultCode == Activity.RESULT_OK)
            {
                new RestoreSMS().execute();
            }
    }
}

Activity.RESULT_OK value is -1 and resultCode in onActivityResult is always 0 when use with kitkat.

From the Android documentation:

onActivityResult Called when an activity you launched exits, giving you the requestCode you started it with, the resultCode it returned, and any additional data from it. The resultCode will be RESULT_CANCELED if the activity explicitly returned that, didn't return any result, or crashed during its operation.

RESULT_CANCELED value is 0, probably on KitKat is not set a result value and the default one is returned.

As workaround on KitKat, you can try to check if your app is the default one when onActivityResult is fired. Try this code:

btnSMSRestore.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        if (Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
            if (!isDefaultSmsApp(SMSActivity.this)) {
            {
                Intent intent = new Intent(Telephony.Sms.Intents.ACTION_CHANGE_DEFAULT);
                intent.putExtra(Telephony.Sms.Intents.EXTRA_PACKAGE_NAME, getPackageName());
                startActivityForResult(intent, DEF_SMS_REQ);
            }
        } else {
            new RestoreSMS().execute();
        }
});

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case DEF_SMS_REQ:
            if (Build.VERSION.SDK_INT == android.os.Build.VERSION_CODES.KITKAT && isDefaultSmsApp(this) ||
                    Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && resultCode == Activity.RESULT_OK) {
                new RestoreSMS().execute();
            }
            break;
    }
}

@TargetApi(Build.VERSION_CODES.KITKAT)
public static boolean isDefaultSmsApp(Context context) {
    return context.getPackageName().equals(Telephony.Sms.getDefaultSmsPackage(context));
}