NullPointerException Attempt to invoke virtual method boolean java lang String equalsIgnoreCase java lang String on a null object reference

Question

I am getting this error at runtime      java lang RuntimeException  Unable to start activity ComponentInfo   java lang NullPointerException  Attempt to invoke virtual method    boolean java lang String equalsIgnoreCase java lang String   on a   null object reference   StackTrace   01-12 03 44 54 270  E AndroidRuntime 1437   FATAL EXCEPTION  main 01-12 03 44 54 270  E AndroidRuntime 1437   Process  home saket  PID  1437 01-12 03 44 54 270  E AndroidRuntime 1437   java lang RuntimeException  Unable to start activity ComponentInfo home saket home saket addmember Add Update User   java lang NullPointerException  Attempt to invoke virtual method  boolean java lang String equalsIgnoreCase java lang String   on a null object reference 01-12 03 44 54 270  E AndroidRuntime 1437       at android app ActivityThread performLaunchActivity ActivityThread java 2298  01-12 03 44 54 270  E AndroidRuntime 1437       at android app ActivityThread handleLaunchActivity ActivityThread java 2360  01-12 03 44 54 270  E AndroidRuntime 1437       at android app ActivityThread access 800 ActivityThread java 144  01-12 03 44 54 270  E AndroidRuntime 1437       at android app ActivityThread H handleMessage ActivityThread java 1278  01-12 03 44 54 270  E AndroidRuntime 1437       at android os Handler dispatchMessage Handler java 102  01-12 03 44 54 270  E AndroidRuntime 1437       at android os Looper loop Looper java 135  01-12 03 44 54 270  E AndroidRuntime 1437       at android app ActivityThread main ActivityThread java 5221  01-12 03 44 54 270  E AndroidRuntime 1437       at java lang reflect Method invoke Native Method  01-12 03 44 54 270  E AndroidRuntime 1437       at java lang reflect Method invoke Method java 372  01-12 03 44 54 270  E AndroidRuntime 1437       at com android internal os ZygoteInit MethodAndArgsCaller run ZygoteInit java 899  01-12 03 44 54 270  E AndroidRuntime 1437       at com android internal os ZygoteInit main ZygoteInit java 694  01-12 03 44 54 270  E AndroidRuntime 1437   Caused by  java lang NullPointerException  Attempt to invoke virtual method  boolean java lang String equalsIgnoreCase java lang String   on a null object reference 01-12 03 44 54 270  E AndroidRuntime 1437       at home saket addmember Add Update User onCreate Add Update User java 38  01-12 03 44 54 270  E AndroidRuntime 1437       at android app Activity performCreate Activity java 5933  01-12 03 44 54 270  E AndroidRuntime 1437       at android app Instrumentation callActivityOnCreate Instrumentation java 1105  01-12 03 44 54 270  E AndroidRuntime 1437       at android app ActivityThread performLaunchActivity ActivityThread java 2251  01-12 03 44 54 270  E AndroidRuntime 1437           10 more 01-12 03 44 54 272  W ActivityManager 472     Force finishing activity home saket  addmember Add Update User 01-12 03 44 54 273  E ActivityManager 472   Invalid thumbnail dimensions  384x384   Below I am posted the codes and pointed out the error line   Add Update User java    Override     protected void onCreate Bundle savedInstanceState           TODO Auto-generated method stub     super onCreate savedInstanceState       setContentView R layout add update screen           set screen     Set Add Update Screen            set visibility of view as per calling activity     String called from   getIntent   getStringExtra  called         if  called from equalsIgnoreCase  add       --- gt 38th error line         add view setVisibility View VISIBLE           update view setVisibility View GONE         else            update view setVisibility View VISIBLE           add view setVisibility View GONE           USER ID   Integer parseInt getIntent   getStringExtra  USER ID              Contact c   dbHandler Get Contact USER ID              add name setText c getName             add mobile setText c getPhoneNumber             add email setText c getEmail                dbHandler close

User · Answer

This is the error line   if  called from equalsIgnoreCase  add       --- gt 38th error line   This means that called from is null  Simple check if it is null above   String called from   getIntent   getStringExtra  called     if called from    null        called from    empty string     if  called from equalsIgnoreCase  add             do whatever   else          do whatever     That way  if called from is null  it ll execute the else part of your if statement

User · Answer

called from must be null  Add a test against that condition like  if  called from    null  amp  amp  called from equalsIgnoreCase  add        or you could use Yoda conditions  per the Advantages in the linked Wikipedia article it can also solve some types of unsafe null behavior they can be described as placing the constant portion of the expression on the left side of the conditional statement    if   add  equalsIgnoreCase called from         lt -- safe if called from is null

User · Answer

The exception occurs due to this statement   called from equalsIgnoreCase  add     It seem that the previous statement  String called from   getIntent   getStringExtra  called      returned a null reference    You can check whether the intent to start this activity contains such a key  called

[java] NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equalsIgnoreCase(java.lang.String)' on a null object reference

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