title: update textview in activity from Fragment
body: <p>How to update <code>TextView</code> in Activity A from <code>DialogFragment</code> ?</p>
  
  <p>in my case, after click the close button in <code>DialogFragment</code>, i need to call the method that can change <code>TextView</code></p>
  
  <p>this is method from <code>Activity</code>:</p>
  
  <pre><code>public void setCountText(String text){
      CountItem = (TextView) findViewById(R.id.tv_numOfItem);
      CountItem.setText(text);
  }
  </code></pre>
  
  <p>Onclick Button in <code>DialogFragment</code>:</p>
  
  <pre><code>View.OnClickListener closeHandler = new View.OnClickListener() {
      @Override
      public void onClick(View v) {
          // TODO Auto-generated method stub
  
  
          new menufeedActivity().setQountText(getCount);
  
  
          InfoOrderDialog.this.dismiss();
  
      };
  
  };
  </code></pre>
  
  <p>Anyone know how to solve this?</p>
  
  <pre><code>04-29 03:08:17.513: E/AndroidRuntime(1738): FATAL EXCEPTION: main
  04-29 03:08:17.513: E/AndroidRuntime(1738): java.lang.NullPointerException
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at android.app.Activity.findViewById(Activity.java:1744)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at com.example.android.rssfeed.menufeedActivity.setQountText(menufeedActivity.java:169)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at com.example.android.rssfeed.InfoOrderDialog$2.onClick(InfoOrderDialog.java:110)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at android.view.View.performClick(View.java:3110)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at android.view.View$PerformClick.run(View.java:11928)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at android.os.Handler.handleCallback(Handler.java:587)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at android.os.Handler.dispatchMessage(Handler.java:92)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at android.os.Looper.loop(Looper.java:132)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at android.app.ActivityThread.main(ActivityThread.java:4025)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at java.lang.reflect.Method.invokeNative(Native Method)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at java.lang.reflect.Method.invoke(Method.java:491)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
  04-29 03:08:17.513: E/AndroidRuntime(1738):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>