title: Force close while calling mainactivity from widget (android)
body: <p>Iam creating a simple widget, by this widget i want to open my mainactivity.</p>
  
  <p>Iam sending a unique key from my widget class to check whether my mainactivity is called via widget or not.</p>
  
  <p>But as soon as i clicked on my widget my mainactivity get force close.</p>
  
  <p>here is code of my widget class...</p>
  
  <pre><code>@Override
  public void onUpdate(Context context, AppWidgetManager appWidgetManager,
          int[] widgets) {
      // TODO Auto-generated method stub
      int numofWidgets = widgets.length;
      for(int i=0;i&lt;numofWidgets;i++){
          int widget = widgets[i];
          Intent in = new Intent(context, EmergencyButton.class);
          in.putExtra("uniquevalue", "widget");
          PendingIntent pendingintent = PendingIntent.getActivity(context, 0, in, 0);
          RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widgetlayout);
          views.setOnClickPendingIntent(R.id.button, pendingintent);
          appWidgetManager.updateAppWidget(widget, views);
      }
  }
  </code></pre>
  
  <p>And Here is my code of mainactivity where iam checking whether called came from widget or not</p>
  
  <pre><code>   @Override
  protected void onCreate(Bundle savedInstanceState) {
      // TODO Auto-generated method stub
      super.onCreate(savedInstanceState);
      setContentView(R.layout.mainactivity); 
       Intent intentwidget = this.getIntent();
      if(intentwidget !=null)
      {
        String widgetdata = "nothing";
        widgetdata = intentwidget.getExtras().getString("uniquevalue");//this is line 29 
        if(widgetdata.equals("widget"))
          {
  
          }
      }
  </code></pre>
  
  <p>}</p>
  
  <p>And here is my logcat</p>
  
  <pre><code>11-04 14:57:14.361: E/AndroidRuntime(1701): FATAL EXCEPTION: main
  11-04 14:57:14.361: E/AndroidRuntime(1701): java.lang.RuntimeException: Unable to start activityComponentInfo{com.appsionlabs.googlemapv2/com.appsionlabs.googlemapv2.EmergencyButton}: java.lang.NullPointerException
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at          android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at android.os.Handler.dispatchMessage(Handler.java:99)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at android.os.Looper.loop(Looper.java:123)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at android.app.ActivityThread.main(ActivityThread.java:3683)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at java.lang.reflect.Method.invokeNative(Native Method)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at java.lang.reflect.Method.invoke(Method.java:507)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at dalvik.system.NativeStart.main(Native Method)
  11-04 14:57:14.361: E/AndroidRuntime(1701): Caused by: java.lang.NullPointerException
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at com.appsionlabs.googlemapv2.EmergencyButton.onCreate(EmergencyButton.java:29)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
  11-04 14:57:14.361: E/AndroidRuntime(1701):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
  </code></pre>