CODEWITHSUNDEEP
androidandroid-layout
Chaitanya Reddy
Chaitanya Reddy

Reputation: 43

Validate input in Edittext after enter data in Android

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));
        }
    });

Upvotes: 0

Views: 1543

Answers (1)

Abhisek Lamsal
Abhisek Lamsal

Reputation: 463

  1. For allowing only 3 numbers use android:maxLength="3" in your EditText

  2. 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

Upvotes: 2

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