erreur NullPointerException

Question

Logcat

08-17 06:37:22.264: ERROR/AndroidRuntime(1090): java.lang.RuntimeException: Unable to start activity ComponentInfo{one.two/one.two.Booking}: java.lang.NullPointerException 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2268) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at android.app.ActivityThread.access$1800(ActivityThread.java:112) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at android.os.Handler.dispatchMessage(Handler.java:99) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at android.os.Looper.loop(Looper.java:123) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at android.app.ActivityThread.main(ActivityThread.java:3948) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at java.lang.reflect.Method.invoke(Method.java:521) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at dalvik.system.NativeStart.main(Native Method) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090): Caused by: java.lang.NullPointerException 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at one.two.Booking.onCreate(Booking.java:50) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 
08-17 06:37:22.264: ERROR/AndroidRuntime(1090):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231) 

Booking.java

public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     db = new DBAdapter(this); 
     this.setContentView(R.layout.booking); 
     txtArrivalTime = (TextView) findViewById(R.id.txtArrivalTime); // Member assignment 
     txtFerry = (TextView) findViewById(R.id.txtFerry); 
     txtStatus = (TextView) findViewById(R.id.txtStatus); 
     txtDestination = (TextView) findViewById(R.id.txtDestination); 
     colourSpinner = (Spinner) findViewById(R.id.myspinner); // Member assignment 
     Button btnBook = (Button) findViewById(R.id.btnBook); 
     db.open(); 
     fillData(); 
     db.close(); 
     colourSpinner.setOnItemSelectedListener(new MyOnItemSelectedListener()); 
     b = this.getIntent().getExtras(); 
     s = b.getString("DEFAULTTEXT");  

     btnBook.setOnClickListener(new MyOnClickListener()); 


    } 

ligne 50 est s = b.getString ("DefaultText");

Merci.

Answer 1

Au lieu de cela:

b = this.getIntent().getExtras(); 
s = b.getString("DEFAULTTEXT"); 

Utilisez getStringExtra(String)

s = this.getIntent().getStringExtra("DEFAULTTEXT"); 

Le paquet que vous obtenez de getExtras() est nulle, d'où l'exception