How to use the variable of one method in another method in Java(android)

Question

I am retrieving the value of a TextView like this

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.calculation);
    TextView heading = (TextView) findViewById(R.id.paper_name);
    ......
}

I have another method in same class

@Override
public void onClick(View v) {   
    int BLACK_AND_WHITE_MULTIUPLIER = 4200;
    int COLOR_MULTIUPLIER = 6400;
    switch (v.getId()) {
        case R.id.btCalculate:
        int multiplier = rbColor.isChecked() ? COLOR_MULTIUPLIER : BLACK_AND_WHITE_MULTIUPLIER;
        int column = Integer.parseInt((String) spColumn.getSelectedItem());
        int inch = Integer.parseInt((String) spInch.getSelectedItem());
        tvAmount.setText((multiplier * column * inch) + "");
        break;
    }
}

I want to set the value of COLOR_MULTIUPLIER and BLACK_AND_WHITE_MULTIUPLIER based on value of heading which I have got from the onCreate method. Is it possible?

Answer 1

Move the TextView heading; so that it is a class variable not a local variable and then it will be accessible throughout your whole class.

It can then be intialized in onCreate and read and or updated in onClick

Answer 2

Declare your TextView at class level...

TextView heading;

protected void onCreate(Bundle savedInstanceState)
    {


        super.onCreate(savedInstanceState);
        setContentView(R.layout.calculation);

        heading = (TextView) findViewById(R.id.paper_name);
        heading.setText("something");

            ......

then access it in onClick() method as below...

@Override
public void onClick(View v)
{   
     int BLACK_AND_WHITE_MULTIUPLIER = 4200;
     int COLOR_MULTIUPLIER = 6400;
    switch (v.getId())
    {
        case R.id.btCalculate:

            int multiplier = 0;

            if (heading.getText().toString.equals("something")) {

                multiplier = COLOR_MULTIUPLIER;

            } else {

                multiplier = BLACK_AND_WHITE_MULTIUPLIER;

            }

            //int multiplier = rbColor.isChecked() ? COLOR_MULTIUPLIER
            //        : BLACK_AND_WHITE_MULTIUPLIER;
            int column = Integer.parseInt((String) spColumn
                    .getSelectedItem());
            int inch = Integer.parseInt((String) spInch.getSelectedItem());
            tvAmount.setText((multiplier * column * inch) + "");
            break;
    }
}

Answer 3

Like I said in my comment , you just need to make heading a variable that belongs to the whole object, not just the onCreate method. You do this in the following way.

public class MyActivity extends Activity {

    TextView heading;  //Declared outside of onCreate

    protected void onCreate(Bundle savedInstanceState) {
        heading = (TextView) findViewById(R.id.paper_name); //Assigned inside of onCreate
    }
}

Then that variable becomes accessible inside your onClick

public void onClick(View v) {
    heading.getText(); //Or whatever you need to use it for
}

Answer 4

Declare your TextView heading outside of the onCreate method ie at class level. Inside onCreate assign it a value and Now in onClick method can access the varaible heading and get it's value.