Question

Here i am using two EditTexts for getting some number as integer value ..

<EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" />
     <EditText
        android:id="@+id/editText3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" />

Now Im planning to do some calculation
some

   int i1,i2,i3;
    String t1,t2,t3;
    EditText et1,et2,et3;
    int result,comp;
  protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       et1=(EditText)findViewById(R.id.editText1);
       et2=(EditText)findViewById(R.id.editText2);
       et3=(EditText)findViewById(R.id.editText3);
    //and also storing to string like
                       t1=et1.getText().toString();
                   t2=et2.getText().toString();
                       t3=et3.getText().toString();
               i1=Integer.parseInt(t1);
               i2=Integer.parseInt(t2);
                   i3=Integer.parseInt(t3);
                       comp=i2-i1;
}

/here int some x=10; my problem is how to check conditions i need to get comp value if its selected (by entering on two EditTexts) else One editText(i3 valsu)
any one help me …./

       public int CalculateUsage(int customersUsage)
                {
        int x=10;
        comp= customersUsage;
        if(comp!=0)
        {
        customersUsage=comp;
        result=(customersUsage*x) ;
        }

        else if(i3 !=null)
        {
        customersUsage=i3;
        result=(customersUsage*x) ;
        }
}

Answer 1

Integer.parseInt() throws an Exception if the String representation isn’t actually an integer. You should make a try-catch block and should set the values to 0 respectively, or the desired default value

try{
    i1=Integer.parseInt(t1);
} catch(Exception e) {
    i1=0;
}
etc...

Because the edit text value is currently “[empty]”.

EDIT:
The edit text are currently empty because you haven’t yet set anything to them.
The ems=”10″ that you have in you layout isn’t the edit text value.