android.widget.Button cannot be cast to android.widget.EditText

Question

Developing my first Android calculator application, I succeeded in updating a TextView in a new activity by passing the answer via an intent, but this requires the user to hit Back to perform another calculation. I'm trying to make the doCalculation button update a simple TextView in the MainActivity and getting the error:

06-22 11:08:17.318: E/AndroidRuntime(31328): Caused by: java.lang.ClassCastException: android.widget.Button cannot be cast to android.widget.EditText

Here's my code:

/** Called when the user clicks the Calculate! button */
public void doCalculation(View view) {
    // Do something in response to button
    int answerInt;
    String answer;
    EditText numberOne = (EditText) findViewById(R.id.number1);
    EditText numberTwo = (EditText) findViewById(R.id.number2);
    int numberOnee = Integer.parseInt(numberOne.getText().toString());
    int numberTwoo = Integer.parseInt(numberTwo.getText().toString());
    answerInt = numberOnee * numberTwoo;
    answer = Integer.toString(answerInt);

    TextView homeAnswerView = (TextView) findViewById(R.id.homeAnswerView);
    homeAnswerView.setTextSize(40);
    homeAnswerView.setText(answer);
}

For reference, here's the code that worked successfully launching a new activity:

// Called when the user clicks the Calculate! button
public void doCalculation(View view) {
    // Do something in response to button
    int answerInt;
    String answer;
    Intent intent = new Intent(this, DisplayCalculationActivity.class);
    EditText numberOne = (EditText) findViewById(R.id.number1);
    EditText numberTwo = (EditText) findViewById(R.id.number2);
    int numberOnee = Integer.parseInt(numberOne.getText().toString());
    int numberTwoo = Integer.parseInt(numberTwo.getText().toString());
    answerInt = numberOnee * numberTwoo;
    answer = Integer.toString(answerInt);
    intent.putExtra(EXTRA_MESSAGE, answer);
    startActivity(intent);
}

UPDATE, the XML for reference:

<EditText
    android:id="@+id/number2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView3"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="16dp"
    android:ems="10"
    android:inputType="number" />

<EditText
    android:id="@+id/number1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView1"
    android:layout_centerHorizontal="true"
    android:ems="10"
    android:inputType="number"
    android:singleLine="true" />

<Button
    android:id="@+id/calculateBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/number2"
    android:layout_alignRight="@+id/number2"
    android:layout_below="@+id/number2"
    android:layout_marginTop="14dp"
    android:onClick="doCalculation"
    android:text="Calculate!" />

Thank you for your help, -Michael

Oleksiy · Accepted Answer · 2014-05-30 18:37:48Z

12

It seems like either R.id.number1 or R.id.number2 is a Button. Check your XML and make sure it's an EditText.

Edit: Original answer didn't work, but cleaning the project solved the problem.

edited May 30, 2014 at 18:37

answered Jun 22, 2013 at 2:19

Oleksiy

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5 Comments

Michael Over a year ago

Thanks for the quick reply. Confirming both are EditText.

Oleksiy Over a year ago

Try one more thing: clean your project

Michael Over a year ago

Cleaning the project fixed it! Thank you!!

Michael Over a year ago

I tried to up-vote your answer but don't have the reputation. In any case, thanks again.

D.Ginzbourg Over a year ago

I followed the steps in the answer (cleaned and then made sure it's the id) and noticed that going to the source of my EditText R.id brings me to the EditText. Thought this is definitely not a IDE cache problem. What I did do is to change the LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" to android:layout_width="match_parent" android:layout_height="match_parent" For some reason it fixed the issue (I had this whole layout wrapped in something else that I just recently removed).

user462990 · Accepted Answer · 2013-07-31 11:37:53Z

0

I've just had this problem. It seems that the xml layout file is not compiled properly. Or rather it is not included in the list of changed files to be compiled.

answered Jul 31, 2013 at 11:37

user462990

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Comments

Ibraheem Samy · Accepted Answer · 2015-05-30 22:07:00Z

0

i was having the same situation but i found out that there are two textviews with same ids in different activities so i changed one of them and the program ran clearly so check the ids of all your edittext and buttons and change the samilier even if they were in other activities and i think it will run with out any problems

edited May 30, 2015 at 22:07

answered May 30, 2015 at 20:30

Ibraheem Samy

11 bronze badge

Comments

D.Ginzbourg · Accepted Answer · 2016-05-14 13:35:56Z

0

I followed the steps in the answer (cleaned and then made sure it's the id) and noticed that going to the source of my EditText R.id brings me to the EditText. Thought this is definitely not a IDE cache problem.

What I did do is to change the LinearLayout

android:layout_width="fill_parent" 
android:layout_height="fill_parent"

to

android:layout_width="match_parent"
android:layout_height="match_parent"

For some reason it fixed the issue (I had this whole layout wrapped in something else that I just recently removed).

answered May 14, 2016 at 13:35

D.Ginzbourg

4807 silver badges22 bronze badges

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