when edittext is empty and button is pressed android application crashes

Question

When EditText is empty and button is pressed android application crashes if 1 or more edittext is empty and pushing the button causes error.

this is the code:

public class Tab4Weight extends  Fragment {
       EditText firstNumber;
       EditText secondNumber;
       TextView addResult;
       Button btnAdd;

       @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
          View view = inflater.inflate(R.layout.tab4weight, container, false);

          firstNumber = (EditText)view.findViewById(R.id.txtNumber1);
          secondNumber = (EditText)view.findViewById(R.id.txtNumber2);
          addResult = (TextView)view.findViewById(R.id.txtResult);
          btnAdd = (Button)view.findViewById(R.id.btnAdd);
          btnAdd.setOnClickListener(new View.OnClickListener() {

          @Override
          public void onClick(View v) {
             String value1= firstNumber.getText().toString();
             String value2= secondNumber.getText().toString();
             int a=Integer.parseInt((value1));
             int b=Integer.parseInt((value2));

             int sum= getCoordinates(a,b);
             Toast.makeText(getActivity(),"Weight in Kg: " + 
             String.valueOf(sum),Toast.LENGTH_LONG).show();

          }

          private int getCoordinates (int coordA, int coordB){
              int results = 0;
              if (coordA < 7000 && coordB < 30 && coordB > -45)
              {
                  results = 7400;
              }

              else{
                  if (coordA==8000 && coordB ==30)
                  {
                      results = 7100;
                  }


       firstNumber.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) {

          }

          @Override
          public void afterTextChanged(Editable s) {int jumlah = Integer.parseInt(firstNumber.getText().toString());

          if( firstNumber.getText().toString().equals("")||jumlah > 10001 
           && jumlah < 10999) {
                firstNumber.setText("11000");
                return;
            }
            else {
                if (firstNumber.getText().toString().equals("") || jumlah > 
            11001 && jumlah < 11999) {
                    firstNumber.setText("12000");
                }
                else {
                    if (firstNumber.getText().toString().equals("") || 
             jumlah > 12001 && jumlah < 12999) {
                        firstNumber.setText("13000");
                    }

when edittext is empty and button is pressed android application crashes if 1 or more edittext is empty

can you help me

Answer 1

try this you need to check first that your Edittext value is empty or not

use isEmpty(CharSequence str) to check whether your Edittext is empty or not

Returns true if the string is null or 0-length.

btnAdd.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              if(!TextUtils.isEmpty(firstNumber.getText().toString())&&!TextUtils.isEmpty(secondNumber.getText().toString())){
                  String value1= firstNumber.getText().toString();
                  String value2= secondNumber.getText().toString();
                  int a=Integer.parseInt((value1));
                  int b=Integer.parseInt((value2));

                  int sum= getCoordinates(a,b);
                  Toast.makeText(getActivity(),"Weight in Kg: " +
                          String.valueOf(sum),Toast.LENGTH_LONG).show();
              }else {
                  Toast.makeText(getActivity(), "value is empty", Toast.LENGTH_SHORT).show();
              }

          }
      });