Error android- java Null Pointer Exception

Question

I am getting this error when i am inflating another activity on button click of first activity.I am also Passing the data between the activities.when the data is not being passed then it works fine and am able to view the second activity.the data i am passing is the content of text box from the first activity of integer type.Kindly lemme know where am i going wrong.

code for Activity1.class

public void onClick(View v)

    {

        try
        {
    Log.i("MyActivity", "Entered OnClick()");
    //Toast.makeText(getBaseContext(), "Entered", Toast.LENGTH_SHORT).show();
    int value;
    value=Integer.parseInt(range.getText().toString());
    Bundle bundle= new Bundle();
    bundle.putInt("param1",value);
//  Toast.makeText(getBaseContext(), "Wait", Toast.LENGTH_SHORT).show();
    Intent myIntent = new Intent(v.getContext(), RoutePath.class);
    myIntent.putExtras(bundle);
     startActivity(myIntent);
        }
         catch(Exception e)
            {e.printStackTrace();}
    }

and Activity2.class

public class RoutePath extends MapActivity {

GeoPoint gp1;

GeoPoint gp2;

GeoPoint srcGeoPoint;

GeoPoint destGeoPoint;

double distance;

int value=0;

public void onCreate(Bundle savedInstanceState)

{   



    super.onCreate(savedInstanceState);

    Bundle bundle = getIntent().getExtras();

    value = bundle.getInt("param1",0);

    setContentView(R.layout.main);

    MapView mapView = (MapView) findViewById(R.id.myMapView1);

    mapView.setBuiltInZoomControls(true);

//and then the other code.......

}

and the stack trace

03-21 15:44:39.276: WARN/System.err(3337): java.lang.NullPointerException
03-21 15:44:39.286: WARN/System.err(3337):     at com.nautilus.RoutePath.Welcome.onClick(Welcome.java:50)
03-21 15:44:39.306: WARN/System.err(3337):     at android.view.View.performClick(View.java:2364)
03-21 15:44:39.331: WARN/System.err(3337):     at android.view.View.onTouchEvent(View.java:4179)
03-21 15:44:39.335: WARN/System.err(3337):     at android.widget.TextView.onTouchEvent(TextView.java:6540)
03-21 15:44:39.348: WARN/System.err(3337):     at android.view.View.dispatchTouchEvent(View.java:3709)
03-21 15:44:39.355: WARN/System.err(3337):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
03-21 15:44:39.355: WARN/System.err(3337):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
03-21 15:44:39.385: WARN/System.err(3337):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
03-21 15:44:39.385: WARN/System.err(3337):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
03-21 15:44:39.385: WARN/System.err(3337):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
03-21 15:44:39.385: WARN/System.err(3337):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
03-21 15:44:39.385: WARN/System.err(3337):     at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
03-21 15:44:39.385: WARN/System.err(3337):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
03-21 15:44:39.385: WARN/System.err(3337):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
03-21 15:44:39.385: WARN/System.err(3337):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-21 15:44:39.385: WARN/System.err(3337):     at android.os.Looper.loop(Looper.java:123)
03-21 15:44:39.385: WARN/System.err(3337):     at android.app.ActivityThread.main(ActivityThread.java:4363)
03-21 15:44:39.385: WARN/System.err(3337):     at java.lang.reflect.Method.invokeNative(Native Method)
03-21 15:44:39.396: WARN/System.err(3337):     at java.lang.reflect.Method.invoke(Method.java:521)

On what line do you get an Exception? Or is it in platform code? — ernazm
– ernazm, Commented Mar 21, 2011 at 9:31
Ok for the stack trace, you need to show us the code inside RoutePath.Welcome — tbruyelle
– tbruyelle, Commented Mar 21, 2011 at 10:31
Just click on the line 2 of your stacktrace in LogCat and you'll find the error line in your code. Probably, it's value=Integer.parseInt(range.getText().toString()); where range is null? :) I wonder — ernazm
– ernazm, Commented Mar 21, 2011 at 10:40

tbruyelle · Accepted Answer · 2011-03-21 10:34:08Z

1

Some advices :

Read and provide a stack trace inside your question, it will be very helpfull.
Use this instead of v.getContext() in your Intent constructor
Integer.parseInt() will throw NumberFormatException if your variable range (which is an EditText I assume) returns a empty string, so maybe you should test the result of range.getText().toString().

EDIT :

Do you affect a value to the range variable ? Something like
range = (EditText) findViewById(R.id.range)

edited Mar 21, 2011 at 10:34

answered Mar 21, 2011 at 9:35

tbruyelle

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2 Comments

SAPHIRE Over a year ago

i did all the possible modifications that u suggested but it is nt wrkng...i am able to enter the onClick method ..it seems there is an error in the oncREATE METHOD OF SECOND ACTIVITY.

tbruyelle Over a year ago

all ? So where is the stack trace ? :)

ernazm · Accepted Answer · 2011-03-21 10:06:30Z

0

Maybe there's no view with id R.id.myMapView1 on R.layout.main layout. But what about providing a stack trace?

answered Mar 21, 2011 at 10:06

ernazm

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Comments

Vincent Mimoun-Prat · Accepted Answer · 2011-03-21 10:10:36Z

0

Instead of

int value;
value=Integer.parseInt(range.getText().toString());
Bundle bundle= new Bundle();
bundle.putInt("param1",value);
Intent myIntent = new Intent(v.getContext(), RoutePath.class);
myIntent.putExtras(bundle);

Try

int value;
value=Integer.parseInt(range.getText().toString());
Intent myIntent = new Intent(this, RoutePath.class);
myIntent.putExtra("param1",value);

edited Mar 21, 2011 at 10:10

answered Mar 21, 2011 at 9:26

Vincent Mimoun-Prat

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3 Comments

Vincent Mimoun-Prat Over a year ago

Then you should provide a stack trace of the Exception you are getting.

SAPHIRE Over a year ago

its on the line whwre i retreive the value of editText n convert it into int value=Integer.parseInt(range.getText().toString());

Vincent Mimoun-Prat Over a year ago

Then put a breakpoint on that line, and see that range is null. So it must not be initialized properly ...

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