How to sum checkboxes value in android?

Question

I have a problem in java.

package apa.y;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;



public class myprice extends Activity  {
    /** Called when the activity is first created. */


    CheckBox book,pencil;
    TextView total;
    int sum=0;

    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.mymain);
    pencil = (CheckBox) findViewById(R.id.pencil);
    book = (CheckBox) findViewById(R.id.book);
    total = (TextView) findViewById(R.id.total);

    }

    public void onClick(View v) {

        sum = 0;
        if (pencil.isChecked()) {sum += 10;}else{sum +=0;}
        if (book.isChecked())   {sum += 5;}else{sum +=0;}

        total.setText("Total: "+sum);

    }
}

If book and pencil are checkbox and 1 textview, how to sum it? My existing code didn't work.

score 1 · Accepted Answer · edited May 23 '17 at 11:55

1

What are you clicking on? The checkboxes? Then you need some kind of listener for those views. Two options are provided here: Android: checkbox listener

If you want to use the onClick method as you have it now, change this:

public class myprice extends Activity implements OnClickListener  {

And make sure that you set the OnClickListener for both checkboxes:

pencil = (CheckBox) findViewById(R.id.pencil);
pencil.setOnClickListener(this);
book = (CheckBox) findViewById(R.id.book);
book.setOnClickListener(this);

edited May 23 '17 at 11:55

Community

1
1

answered May 13 '13 at 09:09

Vincent Ketelaars

1,069
1
14
35

wait me please I'll try. . – Diah Permatasari May 13 '13 at 09:14
helooooooo IT WORK! THANK YOU :). amazing hihihi – Diah Permatasari May 13 '13 at 09:25

Vipul Purohit · Answer 2 · 2013-05-13T09:22:52.530

0

Create an OnCheckedChangeListener and set it to all your CheckBox. then on check box checked +1 in an Integer variable and on unchecked -1 from Integer variable. Now you have the latest total sum value of check boxes in your Integer variable.

You can do something like this :

int mCheckSum = 0;

private OnCheckedChangeListener dmCheckChangeListener = new OnCheckedChangeListener() {

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

        if (isChecked) {
            mCheckSum += 1;
        } else if (isChecked == false) {
            if (mCheckSum > 0) {
                mCheckSum -= 1;
            }
        }

    }
};

edited May 13 '13 at 09:22

answered May 13 '13 at 09:06

Vipul Purohit

9,807
6
53
76

wait me pleaseeeee. I'll try – Diah Permatasari May 13 '13 at 09:20
Welcome. If it worked then you can mark my answer as correct. – Vipul Purohit May 13 '13 at 09:27
oh I see. nice to know you :) – Diah Permatasari May 13 '13 at 09:32
Hehehe You can only mark one question as correct. You have marked other answer as correct..but its okay.. :) – Vipul Purohit May 13 '13 at 09:35

How to sum checkboxes value in android?

2 Answers2