runOnUiThread() - Android dev

[james6754]

Hi, I have created a new Thread in my Activity and call start on it. The run() method of the new thread runs but when I am attempting to change the UI it crashes.

Because of the above I am using runOnUiThread().

Button v = (Button) findViewById(R.id.newButton);

runOnUiThread(new Runnable(){public void run(){
		v.setText("Text for new button");}});

I have also tried using this,

MyProj.this.runOnUiThread(new Runnable(){public void run(){
		v.setText("Text for new button");}});

Every time I try to run this, the app crashes. Can anyone help me understand what is going wrong or give an example of how to change the UI from another Thread?

Thanks!