title: I Can't use spinner.setAdapter(adapter);
body: <p>I have CameraList class that provides Cameras list like "SONY","VIVOTEK","VIVOTEK 7XXX","PIXORD","TOSHIBA","JVC E-CON"... </p>
  
  <p>And I want to list them in my spinner but i couldnt. there is my codes..</p>
  
  <pre><code>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&lt;?&gt; 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);
      }
  }
  </code></pre>
  
  <p>My camlist code is</p>
  
  <pre><code>public class CameraList {
      private static String[] cameraModelNames = {"AXIS","AVOISYS","SONY","..."}
  
      public  String[] getlist()
      {
          return cameraModelNames;
      }
  }
  </code></pre>
  
  <p>this is my logCat</p>
  
  <pre><code>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
  </code></pre>