Android error java.lang.NumberFormatException

Question

Full Error

FATAL EXCEPTION: main

              Process: com.intent.explicitintent, PID: 9871
              java.lang.NumberFormatException: For input string: "android.support.v7.widget.AppCompatEditText{c41d17d VFED..CL. ........ 80,80-400,148 #7f0d0075 app:id/numberOne}"
                  at java.lang.Integer.parseInt(Integer.java:521)
                  at java.lang.Integer.parseInt(Integer.java:556)
                  at com.intent.explicitintent.MainActivity.add(MainActivity.java:40)
                  at com.intent.explicitintent.MainActivity$1.onClick(MainActivity.java:28)
                  at android.view.View.performClick(View.java:5610)
                  at android.view.View$PerformClick.run(View.java:22265)
                  at android.os.Handler.handleCallback(Handler.java:751)
                  at android.os.Handler.dispatchMessage(Handler.java:95)
                  at android.os.Looper.loop(Looper.java:154)
                  at android.app.ActivityThread.main(ActivityThread.java:6077)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

I am trying to add simple addition.But it doesn't work. I have two EditText fields and one Button. I want the result to be shown in another activity when button is click in TextView

Here is my code

Activity One.

public class MainActivity extends AppCompatActivity {
EditText oneNumber;
EditText secondNumber;
Button button;

int e;
int b;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    oneNumber = (EditText) findViewById(R.id.numberOne);
    secondNumber = (EditText) findViewById(R.id.numberTwo);
    button = (Button) findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            add(v);
        }
    });


}


public void add(View view) {


    int a = Integer.parseInt(String.valueOf(oneNumber));
    int b = Integer.parseInt(String.valueOf(secondNumber));
    int result = a + b;
    Intent intent = new Intent();
    intent.putExtra("add", result);
    intent.setClass(MainActivity.this, AnotherActivity.class);
    startActivity(intent);





}

}

Second Activity

public class AnotherActivity extends AppCompatActivity {
TextView total;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_another);
    total = (TextView) findViewById(R.id.Total);
    Bundle extras = getIntent().getExtras();
    String result = extras.toString();
    total.setText(result);






  }

}

I think i mess up with getting the integer from EditText and getting the result inside textView in another activity

Any help?

rafsanahmad007 · Accepted Answer · 2017-03-12T11:25:14.427

2

problem is here:

int a = Integer.parseInt(String.valueOf(oneNumber));
int b = Integer.parseInt(String.valueOf(secondNumber));

it should be:

 int a = Integer.parseInt(oneNumber.getText().toString());
int b = Integer.parseInt(secondNumber.getText().toString());

oneNumber is an Editext . You need to get the string from it

In your second activity get the result using:

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_another);
    total = (TextView) findViewById(R.id.Total);
    //get result
    Intent intent = getIntent();
    int result = intent.getIntExtra("add", 0);
    total.setText(String.valueOf(result));

  }

edited Mar 12 '17 at 11:25

answered Mar 12 '17 at 11:08

rafsanahmad007

23,683
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1

`String.valueOf` is redundant if you already have the string from `toString()`. – Joe C Mar 12 '17 at 11:10
Still doesn't work.In second activity, how should i write to get the number? – Mrkle Mar 12 '17 at 11:20
For passing data using bundle see this [answer](http://stackoverflow.com/questions/15445182/passing-data-from-one-activity-to-another-using-bundle-not-displaying-in-secon) – rafsanahmad007 Mar 12 '17 at 11:39

score 1 · Answer 2 · answered Mar 12 '17 at 11:09

1

String.valueOf(oneNumber) is basically the same as oneNumber.toString(), which (as I'm sure you've figured out) is not the same as the text inside the box.

Perhaps what you mean is to use oneNumber.getText().toString() instead.

answered Mar 12 '17 at 11:09

Joe C

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Android error java.lang.NumberFormatException

2 Answers2