Getting error while reading contacts in android development

Hi, I'm new to android development. I'm developing in eclipse and java. I'm trying to read contacts and do some string manupulation like substring() or contains (). i did the following steps,

1. Permission added ( <uses-permission android:name="android.permission.READ_CONTACTS"/> )
2. Code to read contacts :

Cursor people=getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
while(people.moveToNext())
{
int id=people.getColumnIndex(PhoneLookup.DISPLAY_NAME);
String name= people.getString(id);
if(name!="")
{
edittext1.setText(name.substring(2,3));
}
}


Here i'm getting error because of substring. I'm getting error if i use any string class methods. But if assign some hardcoded value in name,then i'm not getting any error. ie.

String name= "John"; // people.getString(id);

Error messages :

08-19 22:13:03.467: E/AndroidRuntime(4265): FATAL EXCEPTION: main
08-19 22:13:03.467: E/AndroidRuntime(4265): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1111, result=-1, data=Intent { (has extras) }} to activity {com.ravi.vrs/com.ravi.vrs.Voice}: java.lang.NullPointerException
08-19 22:13:03.467: E/AndroidRuntime(4265): at android.app.ActivityThread.deliverResults(ActivityThread.java:2553)
08-19 22:13:03.467: E/AndroidRuntime(4265): at android.app.ActivityThread.handleSendResult(ActivityThread.java:2595)
08-19 22:13:03.467: E/AndroidRuntime(4265): at android.app.ActivityThread.access$2000(ActivityThread.java:121)
08-19 22:13:03.467: E/AndroidRuntime(4265): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:973)
08-19 22:13:03.467: E/AndroidRuntime(4265): at android.os.Handler.dispatchMessage(Handler.java:99)
08-19 22:13:03.467: E/AndroidRuntime(4265): at android.os.Looper.loop(Looper.java:130)
08-19 22:13:03.467: E/AndroidRuntime(4265): at android.app.ActivityThread.main(ActivityThread.java:3701)
08-19 22:13:03.467: E/AndroidRuntime(4265): at java.lang.reflect.Method.invokeNative(Native Method)
08-19 22:13:03.467: E/AndroidRuntime(4265): at java.lang.reflect.Method.invoke(Method.java:507)
08-19 22:13:03.467: E/AndroidRuntime(4265): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
08-19 22:13:03.467: E/AndroidRuntime(4265): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
08-19 22:13:03.467: E/AndroidRuntime(4265): at dalvik.system.NativeStart.main(Native Method)
08-19 22:13:03.467: E/AndroidRuntime(4265): Caused by: java.lang.NullPointerException
08-19 22:13:03.467: E/AndroidRuntime(4265): at com.ravi.vrs.Voice.onActivityResult(Voice.java:71)
08-19 22:13:03.467: E/AndroidRuntime(4265): at android.app.Activity.dispatchActivityResult(Activity.java:3908)
08-19 22:13:03.467: E/AndroidRuntime(4265): at android.app.ActivityThread.deliverResults(ActivityThread.java:2549)
08-19 22:13:03.467: E/AndroidRuntime(4265): ... 11 more



Could anyone please guide me how to fix this issue ?


Thanks
Ravi.