Apps Call a method in another class

[Slaine82]

Hi there,

I am building a quiz application and I have two classes:-

Main class which holds the menu for the application and the main parts of the code
Question class which creates and sets up a question, and hold methods for evaluating the questions answer

The main class has a method public void setQuestion(int qNo) which creates a new Question object. The thing is once I have created the question and evaluated it which happens in the Question class, from this class I want to call the setQuestion method back in the Main class, is this possible?

Below are my two classes:-

MAIN

package com.zapp.potogold;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class Main extends Activity {
    int currentQ = 0;
    Context currentContext;
    Question question;
    Button submitButton;
    Resources res;

    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        currentContext = this;
    }
    
    
    public void setView(View view){
       
        switch(view.getId()){

          case R.id.menuitem_1:
              //activate the quiz layout
              setContentView(R.layout.quiz);
              setQuestion(currentQ);
              break;
               
          case R.id.menuitem_2:

              break;
          }

    }
    
    public void setQuestion(int qNo){
        submitButton = (Button) findViewById(R.id.submit);
        submitButton.setEnabled(false);
        submitButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                submitClicked();
            }
        });
        question = new Question(currentContext, qNo);
    }
    
    public void submitClicked(){
        question.evaluateAnswer();
    }
}

QUESTION

package com.zapp.potogold;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class Question {
    private Context mContext;
    private TextView tv; 
    Resources res;
    RadioButton radioButton;
    RadioButton selectedRadioButton;
    RadioGroup rg;
    Button submitButton;
    Button nextQButton;
    int currentQNo;
    static int quizPoints = 0;
    
    //constructor
    public Question(Context ctx, int qNumber) {
        mContext = ctx;
        setQStem(qNumber);
        setAnswers(qNumber);
        submitButton = (Button) ((Activity) mContext).findViewById(R.id.submit);
        currentQNo = qNumber;
    }
    
    public void setQStem(int qNumber){
        //set the question text
        tv = (TextView)((Activity) mContext).findViewById(R.id.questionView);
        
        res = mContext.getResources();
        
        String[] questions = res.getStringArray(R.array.questions);
        String qText = questions[qNumber];

        tv.setText(qText);
    }
    
    public void setAnswers(int qNumber){
        String[] answers = res.getStringArray(R.array.qAnswers);
        String currentQAnswers = answers[qNumber];
        String[] separated = currentQAnswers.split("@");
        rg = (RadioGroup)((Activity) mContext).findViewById(R.id.radioGroup1);
        for(int a = 0; a < separated.length; a++){
            radioButton = new RadioButton(mContext);
            radioButton.setText(separated[a]);
            radioButton.setId(a);
            rg.addView(radioButton);
            radioButton.setOnClickListener(radio_listener);
        }
    }
    
    public void evaluateAnswer(){
        String[] correctAnswers = res.getStringArray(R.array.correctAnswers);
        String currentQCorAns = correctAnswers[currentQNo];
        String currentSelectedString = (String)(selectedRadioButton.getText());
        
        if(currentSelectedString.equals(currentQCorAns)){
            quizPoints += 2;
            setResults("correct");
        } else {
            setResults("incorrect");
        }
    }
    
    private OnClickListener radio_listener = new OnClickListener() {
        public void onClick(View v) {
            submitButton.setEnabled(true);
            // Perform action on clicks
            selectedRadioButton = (RadioButton) v;
        }
    };
    
    private void setResults(String result){
        ((Activity) mContext).setContentView(R.layout.results);
        String nextText = ((Activity) mContext).getString(R.string.result_next);
        
        TextView correctTextView = new TextView(mContext); 
        TextView scoreTextView = new TextView(mContext); 
        TextView nextTextView = new TextView(mContext); 

        correctTextView = (TextView)((Activity) mContext).findViewById(R.id.resultText1); 
        scoreTextView = (TextView)((Activity) mContext).findViewById(R.id.resultScore); 
        nextTextView = (TextView)((Activity) mContext).findViewById(R.id.resultText2); 
        
        nextTextView.setText(nextText);
        scoreTextView.setText(Integer.toString(quizPoints));
        nextTextView.setText(nextText);

        if(result == "correct"){
            String correctText = ((Activity) mContext).getString(R.string.result_correct);
            correctTextView.setText(correctText);
        } else {
            String incorrectText = ((Activity) mContext).getString(R.string.result_incorrect);
            correctTextView.setText(incorrectText);
        }
        
        nextQButton = (Button)((Activity) mContext).findViewById(R.id.nextQButton);
        nextQButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                [B]//I want to call the setQuestion function in the main class to call the next question[/B]
            }
        });
    }
    
}

and I have bolded where I want to call the function from the Question class, any help would be much appreciated.

 

[redcrab]

your Main Class is Your Activity that is a Context.. and I guess that you may use your Main.this as context into your Question class that is referenced therefore after by it mContext field member

so you may cast mContext as Main and use your method inside your question class


((Main)mContext).setQuestion(......);

hope that help


have fun

 

[Slaine82]

Thanks Redcrab!