If statement else statement failing

Question

I have a blackberry app that essentially does a select query on information I enter so if I enter "5" it does a select * from table where id=5 so I get back results. However the else statement of this clause is supposed to return "no results found". Code posted below:

public void onResponse(String data, int code) {

    final Vector vehicleInfo = jasonParser.parseVechicleResponse(data);

    if(vehicleInfo.size() > 0 ){
        UiApplication.getUiApplication().invokeLater(new Runnable() {
            public void run() {
                removeLoader();
                UiApplication.getUiApplication().pushScreen(new VehicleSearchResultScreen(etfVehicleInfo.getText(),vehicleInfo));
            }
        });
    }else{
        UiApplication.getUiApplication().invokeLater(new Runnable() {
            public void run() {
                removeLoader();
                Dialog.alert("No Results found.");
            }
        });
    }
}

The problem with this code is if vehicleinfo.size() = 0 this else statement does not run. The code that runs is the code posted below which is my error code. Which is supposed to get called when collection errors occur. So basicallly, when a record is not found its displaying the string for connection errors, and I cannot at all figure why this else statement is not running; or does it run, and is over run by the following statment?

public void onError(final String data, int code) {
    UiApplication.getUiApplication().invokeLater(new Runnable() {
        public void run() {
            removeLoader();
            Dialog.alert("No Results Found!");
        }
    });
} 

Parse Code

public Vector parseVehicleResponse(String response){
    Vector vector = new Vector();
    try{
        JSONObject jsonVehicleObject = new JSONObject(response);
        VehicleObject vehicle = new VehicleObject();
            vehicle.setChassisNum(jsonVehicleObject.getString("chassis_no"));//chassis_num
            vehicle.setEngineNum(jsonVehicleObject.getString("engine_no"));//engine_num
            vector.addElement(vehicle);
    }catch(Exception e){
        System.out.println("JSONResponseParser.parseNewsHeadlines() " + e );
    }

    return vector;
}

}

Json

  // Return  encoded with JSON
            $result = array(

    "chassis_no"=>$chassis_no,
   "engine_no"=>$engine_no,

 );

Answer 1

It seems to me that your jasonParser.parseVechicleResponse(data); call is throwing an error, and you never get to the if statement. Could it be a typo? Did you mean

parseVehicleResponse

instead of

parseVechicleResponse

(not the extra "c")??

Answer 2

In order to keep the flow of thoughts separated, I am starting a new answer here... You could try to modify the code for parseVehicleResponse by adding a "dummy element zero", as follows:

public Vector parseVehicleResponse(String response){
    Vector vector = new Vector();
    VehicleObject vehicle = new VehicleObject(); // create a "dummy object"
    vehicle.setChassisNum("-1"); // initialize members - with "valid" data... 
    vehicle.setEngineNum("-1");  // again - make it valid type, but otherwise "wrong"
    vector.addElement(vehicle);  // the vector now has at least one element

    // here comes your original code:
    try{
        JSONObject jsonVehicleObject = new JSONObject(response);
        VehicleObject vehicle = new VehicleObject();
            vehicle.setChassisNum(jsonVehicleObject.getString("chassis_no"));//chassis_num
            vehicle.setEngineNum(jsonVehicleObject.getString("engine_no"));//engine_num
            vector.addElement(vehicle);
    }catch(Exception e){
        System.out.println("JSONResponseParser.parseNewsHeadlines() " + e );
    }
    return vector;
}

Now, in the main loop, you do something like this:

Public void onResponse(String data, int code) {

    final Vector vehicleInfo = jasonParser.parseVechicleResponse(data);

    if(vehicleInfo.size() > 1 ){
        UiApplication.getUiApplication().invokeLater(new Runnable() {
            public void run() {
                removeLoader();
                // { add some code to strip the zero-th element from vehicleInfo() } 
                UiApplication.getUiApplication().pushScreen(new VehicleSearchResultScreen(etfVehicleInfo.getText(),vehicleInfo));
            }
        });
    }else{
        UiApplication.getUiApplication().invokeLater(new Runnable() {
            public void run() {
                removeLoader();
                Dialog.alert("No Results found.");
            }
        });
    }
}

This will narrow down the search for the problem some more...