How can we pass data from MainActivity.java to a class in android?

Question

I want to declare an integer variable in MainActivity.java and then pass it to a class,in order to use that integer variable as one of the attributes of that class and I don't know how to do it.

Is it possible?Anyone has any idea?

Here is the class.I wanna set M and N from MainActivity.Java

public class Determinant {

//Atributes
private int M = 2;
private int N = M;
private double FinalAnswers[];



//Constructors
public Determinant() {
}

//methods
public void solve(double[][] A, double[] B) {
    int N = B.length;
    for (int k = 0; k < N; k++) {
        /** find pivot row **/
        int max = k;
        for (int i = k + 1; i < N; i++)
            if (Math.abs(A[i][k]) > Math.abs(A[max][k]))
                max = i;

        /** swap row in A matrix **/
        double[] temp = A[k];
        A[k] = A[max];
        A[max] = temp;

        /** swap corresponding values in constants matrix **/
        double t = B[k];
        B[k] = B[max];
        B[max] = t;

        /** pivot within A and B **/
        for (int i = k + 1; i < N; i++) {
            double factor = A[i][k] / A[k][k];
            B[i] -= factor * B[k];
            for (int j = k; j < N; j++)
                A[i][j] -= factor * A[k][j];
        }
    }
    /** back substitution **/
    double[] solution = new double[N];
    for (int i = N - 1; i >= 0; i--) {
        double sum = 0.0;
        for (int j = i + 1; j < N; j++)
            sum += A[i][j] * solution[j];
        solution[i] = (B[i] - sum) / A[i][i];
    }
    /** Print solution **/
    FinalAnswers = solution;
}


//setters


//getters
public double getAnswers(int i) {
    return FinalAnswers[i];
}

public int whatIsM() {
    return M;
}

public int whatIsN() {
    return N;
}
}

I suggest you learn about creating instances of class and writing constrictors and methods. — Code-Apprentice, Sep 12 '16 at 08:27
@MohammadGhanatian Can you provide an example of a class you want to use? — Code-Apprentice, Sep 12 '16 at 08:38
refer here http://stackoverflow.com/questions/22759644/access-the-variable-in-activity-in-another-class — brahmy adigopula, Sep 12 '16 at 08:40
Possible duplicate of [Java setters and getters](http://stackoverflow.com/questions/17529406/java-setters-and-getters) — Saeed Zhiany, Sep 12 '16 at 09:26

score 0 · Answer 1 · edited Sep 12 '16 at 08:55

Create a new class called common.class

import android.app.Application;

/**
 * Created by webcastman on 9/8/16.
 */

public class common_class extends Application
{
private static String gstring;
private static Integer gnumber;

public static  String webURL  = "http://localhost:81/";

public static String getgstring()
{
    return gstring;
}
public static void   putgstring(String str)
{
    gstring = str;
}

public static Integer getgnumber()
{
    return gnumber;
}
public static void putgnumber(Integer nor)
{
    gnumber = nor;
}
}

then in the main class, write the code.

common_class.putgnumber(..your number..);

then from any other java class

value = common_class_getgnumber()

This is too complicated for regular classes. – Code-Apprentice Sep 12 '16 at 08:28 — Code-Apprentice, Sep 12 '16 at 08:28

Mohammad Ghanatian · Accepted Answer · 2016-09-15T01:59:11.927

0

I found it.

We can add a setter method to that class for assigning the value to an attribute.

edited Sep 15 '16 at 01:59

answered Sep 12 '16 at 08:41

Mohammad Ghanatian

19
6

How can we pass data from MainActivity.java to a class in android?

2 Answers2