CODEWITHSUNDEEP
androidnullpointerexception
Jeff
Jeff

Reputation: 8421

Error:java.lang.IllegalStateException: Could not execute method of the activity

Sorry i am new in android

I have 2 EditTexts and 1 button i am going to when i push the button the value of EditTexts be printed, but i give the error

The XML:

    <Button
        android:id="@+id/submit"
        android:layout_width="212dp"
        android:layout_height="wrap_content"
        android:layout_x="52dp"
        android:layout_y="337dp"
        android:text="@string/Submit"
        android:onClick="submit" />

    <EditText
        android:id="@+id/quantity"
        android:layout_width="182dp"
        android:layout_height="wrap_content"
        android:layout_x="9dp"
        android:layout_y="86dp"
        android:ems="10" />

    <EditText
        android:id="@+id/Unit"
        android:layout_width="182dp"
        android:layout_height="wrap_content"
        android:layout_x="11dp"
        android:layout_y="15dp"
        android:ems="10" >

        <requestFocus />
   </EditText>

The Java class is:

    public class add extends Activity
    {

        private static  String[] montharray; 

        Button   mButton;

        EditText Unit;
        EditText quantity;

        private int days;

        @Override
        public void onCreate(Bundle savedInstanceState) 
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.add);

            Unit          =(EditText) findViewById(R.id.unit);
            quantity      =(EditText) findViewById(R.id.quantity);
            mButton       =(Button) findViewById(R.id.submit);
        }  



        public void submit(View view) 
        {


            System.out.println("Unit=    "+Unit.getText().toString()+"   quantity=   "+quantity.getText().toString());  


        }
}

Here is thr errors:

05-16 15:37:35.857: E/AndroidRuntime(17951): FATAL EXCEPTION: main
05-16 15:37:35.857: E/AndroidRuntime(17951): java.lang.IllegalStateException: Could not execute method of the activity
...


05-16 15:37:35.857: E/AndroidRuntime(17951): Caused by: java.lang.NullPointerException
05-16 15:37:35.857: E/AndroidRuntime(17951): at net.learn2develop.UsingIntent.add.submit(add.java:56)

I initiate all the objects, what is the java.lang.NullPointerException?

Upvotes: 0

Views: 307

Answers (2)

codeMagic
codeMagic

Reputation: 44571

Unit is capitalized here 

<EditText
    android:id="@+id/Unit"
    android:layout_width="182dp"
    android:layout_height="wrap_content"
    android:layout_x="11dp"
    android:layout_y="15dp"
    android:ems="10" >

but not in your code

Unit          =(EditText) findViewById(R.id.unit);

You should change it in your xml to lowercase. Also, you should follow a standard for naming conventions. Class names should be camelcased (All words start with capital letter) and variable names should be mixedcase (start with lowercase and capitalize following words i.e String mixedCase;) This isn't necessary but it will most likely cause you grief in the future. It also makes it easier for others to understand what you have.

Upvotes: 0

Sebastian Breit
Sebastian Breit

Reputation: 6159

the id's are case sensitive...

you should do: findViewById(R.id.Unit);

Upvotes: 1

Related Questions