Validate input in Edittext after enter data in Android

Question

I have layout in my application like below: When i enter 100 from soft keyboard in edit text it should show correct answer toast automatically and it should allow only 3 numbers to enter in input text.

How to do this?

10 x 10 = ___

i tried with Textwatcher but its not working. When i enter correct answer EditText 10 X 10 should change to next value.

    int min = 0;
int max = 20;
Random r = new Random();
int mRandomOne = r.nextInt(max - min + 1) + min;
int mRandomTwo = r.nextInt(10 - 0 + 1) + 0;
        mFillAnswer = (EditText) findViewById(R.id.fill);
    mFillAnswer.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            int a = Integer.parseInt(mOneValue.getText().toString());
            int b = Integer.parseInt(mTwoValue.getText().toString());

            int val = Integer.parseInt(mFillAnswer.getText().toString());
            if (val == (a * b)) {
                mOneValue.setText(String.valueOf(mRandomOne));
                mTwoValue.setText(String.valueOf(mRandomTwo));
            }
        }

        @Override
        public void afterTextChanged(Editable s) {
            mOneValue.setText(String.valueOf(mRandomOne));
            mTwoValue.setText(String.valueOf(mRandomTwo));
        }
    });

specify where your errors are. some code will help us identify your problem — Gilbert Mendoza
– Gilbert Mendoza, Commented Jan 8, 2017 at 17:11
I don't think you would need to do anything inside afterTextChanged method — Abhisek Lamsal
– Abhisek Lamsal, Commented Jan 8, 2017 at 17:18
once enter correct value in Edit text ..question should be changed...in my case...10 x 10 = __..once i enter 100 here immeditaley question changed from 10 x 10 to next random question — Chaitanya Reddy
– Chaitanya Reddy, Commented Jan 8, 2017 at 17:22
can you make yourself clear. whats the result when you type in 100 ? from what i see it should change to a new question — Gilbert Mendoza
– Gilbert Mendoza, Commented Jan 8, 2017 at 17:26
after enter 100 in Edit text, question is not changing...still it shows 10 x 10 mOneValue.setText(String.valueOf(mRandomOne)); mTwoValue.setText(String.valueOf(mRandomTwo)); — Chaitanya Reddy
– Chaitanya Reddy, Commented Jan 8, 2017 at 17:28

Abhisek Lamsal · Accepted Answer · 2017-01-08 17:49:40Z

2

For allowing only 3 numbers use android:maxLength="3" in your EditText
For automatically detecting the correct or incorrect answer use TextWatcher

Update To change the TextView values:

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

        //To avoid exception
        if(mFillerAnswer.getText().toString().equals("")){return;}

        int a = Integer.parseInt(mOneValue.getText().toString());
        int b = Integer.parseInt(mTwoValue.getText().toString());

        int val = Integer.parseInt(mFillAnswer.getText().toString());
        if (val == (a * b)) {
            //generate and use Random numbers here
            mOneValue.setText(r.nextInt(max - min + 1) + min);
            mTwoValue.setText(r.nextInt(10 - 0 + 1) + 0);

            //to clear edit text
            mFillAnswer.setText("")
        }
    }

You were generating random numbers only once so it was pointless to be expecting newer values while the generation code is outside the TextWatcher scope

edited Jan 8, 2017 at 17:49

answered Jan 8, 2017 at 17:13

Abhisek Lamsal

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15 Comments

Abhisek Lamsal Over a year ago

I don't see any problem in your textwatcher code. Why don't you do some logging inside the onTextChanged method if it is being called

Chaitanya Reddy Over a year ago

after enter 100 in Edit text, question is not changing...still it shows 10 x 10

Abhisek Lamsal Over a year ago

you have to generate the random values inside if statement not outside the whole TextWatcher code

Chaitanya Reddy Over a year ago

Yes now it is working,,,,But EditText value is not cleared..it shows previous entered value...Once question change, EdiText field should be empty

Abhisek Lamsal Over a year ago

add mFillAnswer.setText("0") inside the if statement and you are good to go

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