Je ne peux pas utiliser spinner.setAdapter (adaptateur);

J'ai la classe caméraliste qui fournit la liste caméras comme "SONY", "VIVOTEK", "VIVOTEK 7XXX", "PIXORD", "TOSHIBA", "JVC E-CON" ...Je ne peux pas utiliser spinner.setAdapter (adaptateur);

Et je veux à la liste eux dans ma spinner mais je ne pouvais pas. il y a mes codes ..

public class AddCam extends MainActivity { 
    CameraList cams = new CameraList(); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 

     Toast msg = Toast.makeText(AddCam.this, getString(R.string.add_new), Toast.LENGTH_LONG); 

     msg.setGravity(Gravity.CENTER, msg.getXOffset()/2, msg.getYOffset()/2); 

     String a = getString(R.string.add_new); 

     TextView tv = (TextView) findViewById(R.id.head); 
     tv.setText(getString(R.string.add_new)); 

     Spinner s = (Spinner) findViewById(R.id.spinner); 

     ArrayAdapter<?> adapter = ArrayAdapter.createFromResource(
     this, R.array.cameras, android.R.layout.simple_spinner_item); 
     adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     //s.setAdapter(adapter); **** there is null poınter ex. 
     setContentView(R.layout.spinnerex); 
    } 
}

Mon code camlist est-

public class CameraList { 
    private static String[] cameraModelNames = {"AXIS","AVOISYS","SONY","..."} 

    public String[] getlist() 
    { 
     return cameraModelNames; 
    } 
}

c'est mon LogCat

10-02 12:33:50.007: ERROR/AndroidRuntime(4624): Uncaught handler: thread main exiting due to uncaught exception 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624): java.lang.RuntimeException: Unable to start activity ComponentInfo{spexco.hus.cepvizyon/spexco.hus.cepvizyon.AddCam}: java.lang.NullPointerException 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at android.app.ActivityThread.access$2200(ActivityThread.java:119) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at android.os.Handler.dispatchMessage(Handler.java:99) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at android.os.Looper.loop(Looper.java:123) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at java.lang.reflect.Method.invoke(Method.java:521) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at dalvik.system.NativeStart.main(Native Method) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624): Caused by: java.lang.NullPointerException 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at spexco.hus.cepvizyon.AddCam.onCreate(AddCam.java:39) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
10-02 12:33:50.027: ERROR/AndroidRuntime(4624):  ... 11 more

Source

2010-10-02 atasoyh

Pouvez-vous nous montrer le AddCam.java (autour de la ligne 39)? –

Je l'ai ajouté ..... – atasoyh

Évidemment, c'est votre 'Spinner s = (Spinner) findViewById (R.id.spinner);' qui renvoie null au lieu du Spinner désiré. Je suppose que vous avez fait quelque chose de mal ici. –

Vous devez appeler setContentView(R.layout.spinnerex)avant tenter d'accéder à des éléments de l'interface utilisateur dans ce disposition.

Source

2010-10-02 13:22:50

Je ne peux pas utiliser spinner.setAdapter (adaptateur);

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