How to access Activity UI from my class?

see you post, i've edited it , to fix the problem

hope it helps :=)

here is the Edit :

file MyActivity.java:
    public class MyActivity extends Activity {
    TextView myView ;
    protected void onCreate(android.os.Bundle savedInstanceState) {
        myView = (TextView)findViewById(R.id.myView);
            Points myPoints = new Points(this);
            myPoints.displayMsg("Hello World !!!");
    }  
    }

--------------------------------------------------------------

file Points.java:
private class Points {
    protected MyActivity context;
    //add a constructor with the Context of your activity
    public Points(MyActivity _context){
        context = _context;
    }

    public void displayMsg( final String msg){
        context.runOnUiThread(new Runnable() {

            @Override
            public void run() {
                context.myView.setText(msg);    
            }
        });
    }
}

1. Your Points can't be a private class without being an inner class. So your code doesn't even compile...

2. Pass the view as parameter to the constructor of your Points class:

   public class MyActivity extends Activity {
       TextView myView = (TextView)findViewById(R.id.myView);
       Points myPoints new Points(myView);
   
       private class Points {
           public Points(TextView view) {
               // todo
           }
       }
   }