How to textView.setText from Thread?

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Use a Handler:

public TextView pc;
Handler handler = new Handler();
oncreate(..) {
    setContentView(R.layout.main);
    pc = new TextView(context);
    Thread t =new Thread(){
        public void run() {
            handler.post(new Runnable() {
                public void run() {
                    pc.setText("test");
                }
            });
        }
    }};
    t.start();
}

But you have another problem. pc points to a view that is not part of your hierarchy. You probably want to use findViewById with the id of the TextView in your layout.

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