Question

My requirement is as follows: I need to get the data from multiple text
boxes (EditText) and I need to calculate and show it in the another
EditText. How it is possible? As I mentioned there is no button to
press automatically it needs to appear in the total box.

I referred this, but after the loop I’m not getting the value I
declared the variable globally but also not getting the value of the
text box.

EditText et1, et2, etTot;
int x, y, tot;
et1 = (EditText) findViewbyId(R.id.edittext1);
et2 = (EditText) findViewbyId(R.id.edittext2);
etTot = (EditText) findViewbyId(R.id.edittextTot);

et1.addTextChangedListener(new TextWatcher() {

    public void onTextChanged(CharSequence s, int start, int before,
                              int count) {
        x = Integer.parseInt(et1.getText().toString().trim());
        System.out
                .println("AMOUNT IS " + et1.getText().toString());

    }

    public void beforeTextChanged(CharSequence s, int start, int count,
                                  int after) {

    }

    public void afterTextChanged(Editable s) {

    }
});

//same as for et2......

tot = x + y;

etTot.setText(tot.toString());

Answer 1

//global variable
EditText et1,et2,etTot;
int x,y,tot;

// in 0nCreat()
et1 = (EditText)findViewbyId(R.id.edittext1);
et2 = (EditText)findViewbyId(R.id.edittext2);
etTot = (EditText)findViewbyId(R.id.edittextTot);


et1.addTextChangedListener(new TextWatcher() {

    public void onTextChanged(CharSequence s, int start, int before,
    int count) {
        <Activity_NAME>.this.updateValue();
    }

    public void beforeTextChanged(CharSequence s, int start, int count,
    int after) {
    }

    public void afterTextChanged(Editable s) {
    }
    });

et2.addTextChangedListener(new TextWatcher() {

    public void onTextChanged(CharSequence s, int start, int before,
    int count) {
        <Activity_NAME>.this.updateValue();

    }

    public void beforeTextChanged(CharSequence s, int start, int count,
    int after) {

    }

    public void afterTextChanged(Editable s) {

    }
    });


//in class       
private void updateValue(){
    String str1 = et1.getText().toString();
    String str2 = et2.getText().toString();

    if(null!=str1 && str1.lenght()>0 && null!=str2 && str2.lenght()>0)                  
    {
        try{
            x= Integer.parseInt(str1.trim());
            y= Integer.parseInt(str1.trim());

            tot = x + y; 
            if(null!=etTot)
                etTot.setText(tot+"");
            else 
                Toast.makeText(this,"etTot is null ",Toast.LENGHT_SHORT).show();
            }catch (NumberFormatExcption nfe){}
        }

    }