CODEWITHSUNDEEP
androidandroid-edittext
user2137817
user2137817

Reputation: 1853

How to update a textview while typing in an edittext in android

I have multiple edittextand a textview in the bottom in order to get the sum of what is written in the edittextsbut I didn't succeded. I tried the TextWatcherbut it doesn't do the work, for exemple i write in the first one 5 and in the second 10 I got 16 as a result as it counts 5+1+10. I also tried the onfocus method but the problem still with the last edittext it doesn't update the result. I really don't know what to do. Someone had this issue before? TextWatcher implementation:

TextWatcher inputTextWatcher1 = new TextWatcher() {
             public void afterTextChanged(Editable s) {
                number = Integer.parseInt(s.toString());
                sum+=number;
                tv.setText("sum is "+sum);

}

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onTextChanged(final CharSequence s, int start, int before,
                    int count) {

            }

        };

Upvotes: 4

Views: 9968

Answers (2)

Chintan Rathod
Chintan Rathod

Reputation: 26034

Use following code. I have tested it and working like charm..

et1.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before,
            int count) {

    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {
        if (s.length() > 0) {
            int number = Integer.parseInt(s.toString());
            ans -= number;
        }
    }

    @Override
    public void afterTextChanged(Editable s) {
        int number = Integer.parseInt(s.toString());
        ans += number;
        txtOutput.setText("sum is " + ans);
    }
});

et2.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before,
            int count) {

    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {
        if (s.length() > 0) {
            int number = Integer.parseInt(s.toString());
            ans -= number;
        }
    }

    @Override
    public void afterTextChanged(Editable s) {
        int number = Integer.parseInt(s.toString());
        ans += number;
        txtOutput.setText("sum is " + ans);
    }
});

Here, ans must be 0 before use. et1 and et2 are EditText.

Logic

beforeTextChanged will call before any text changes applied. Like you type 5, then it returns "" as there is no data, then if you type 2, it returns 5 as it was entered earlier. So this is the trick.

Before adding any value, just subtract it from previous one. Otherwise your logic is true. but every time you are adding number in answer. Which make your answer false.

Benefit

Now, if you use this logic, there doesn't matter how many EditText there. This will provide true answer. You just need to add TextWatcher to every EditText.

Upvotes: 6

Vishal Pawale
Vishal Pawale

Reputation: 3476

Lets say - editText1 - firstNumber & editText2- secondNumber

    TextWatcher inputTextWatcher1 = new TextWatcher() {
             public void afterTextChanged(Editable s) {
                number1 = Integer.parseInt(editText1.getText().toString());
                number2 = Integer.parseInt(editText2.getText().toString());
                sum = number1 + number2;
                tv.setText("sum is "+sum);

     }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onTextChanged(final CharSequence s, int start, int before,
                    int count) {

            }

        };

Upvotes: 0

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