title: I can't setText() in another class in android
body: <p>I have a <code>TextView</code> with the id <code>android:id="@+id/yazi"</code>, and I have a button that has build in <code>android:OnClick="gonderB"</code></p>
  
  <p>and I can complie this code:</p>
  
  <pre><code>package com.seri.bir;
  
  import android.app.Activity;
  import android.os.Bundle;
  import android.view.View;
  import android.widget.TextView;
  
  public class MainActivity extends Activity {
       Bilmez b;
       TextView t;
      /** Called when the activity is first created. */
  
      @Override
      public void onCreate(Bundle savedInstanceState){
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
          b = new Bilmez();
          t = (TextView) findViewById(R.id.yazi);
      }
      public void gonderB (View v,TextView t,Bilmez b){
          String s = " ..."+this;
          b.yaziYaz(v,s,t);
      }    
  }
  
  class Bilmez {
      public void yaziYaz(View v,String s,TextView t){
          t.setText(s);
      }
  }
  </code></pre>
  
  <p>However I have an error.
  Can I <code>setText</code> in another class?</p>