(Need Help) Using OnClickListener in Fragment, On Button Click App Force Closes

Question

UPDATE

You are getting a button in your view onClick(View view){..}. and your "radio0" is not defined in that view. You want view to be the layout view.

See code:

package com.example.converter;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;

public class TempFragment extends Fragment 
  implements OnClickListener 
  {
  private EditText text;
  Button b;
  View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    view = inflater.inflate(R.layout.fragment_temp, container, false);
    text = (EditText) view.findViewById(R.id.editText1);
    b = (Button) view.findViewById(R.id.button1);
    b.setOnClickListener(this);         
    return view;

}

// this method is called at button click because we assigned the name to the
  // "OnClick property" of the button
  public void onClick(View v) {
    switch (v.getId()) {
    case R.id.button1:
      RadioButton celsiusButton = (RadioButton) view.findViewById(R.id.radio0);
      RadioButton fahrenheitButton = (RadioButton) view.findViewById(R.id.radio1);
      if (text.getText().length() == 0) {
          Toast.makeText(getActivity(), "Please enter a valid number", 
                  Toast.LENGTH_LONG).show();
        return;
      }

      float inputValue = Float.parseFloat(text.getText().toString());
      if (celsiusButton.isChecked()) {
        text.setText(String
            .valueOf(ConverterUtil.convertFahrenheitToCelsius(inputValue)));
        celsiusButton.setChecked(false);
        fahrenheitButton.setChecked(true);
      } else {
        text.setText(String
            .valueOf(ConverterUtil.convertCelsiusToFahrenheit(inputValue)));
        fahrenheitButton.setChecked(false);
        celsiusButton.setChecked(true);
      }
      break;
    }
  } 
}

OLD:

If I get this correct, it's line no 46 that's crashing:

if (celsiusButton.isChecked())

which means you are not finding your celsiusButton at

RadioButton celsiusButton = (RadioButton) view.findViewById(R.id.radio0);

You can step down to line no 46 in your code and double check this.

If it's the correct line then you need to double check if your button is called "radio0" in your xml.