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copied!<p>First organize your import and respect android coding style. I correct the beggining of your code.</p> <pre><code>private static Button mRun, mClear, mHome; private static EditText mUserInput; private static TextView mUserOutput; //LinkedList Customer Queue created here. public static Queue<String> line = new LinkedList<String> (); private static String time; //time variable. private static DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss"); //DateFormat variable. private int intervals; private int cashiers; private int processing_time; Thread arrival; Handler handler, handlerr, handlerrr; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.station); mClear = (Button)findViewById(R.id.button_clear); mHome = (Button) findViewById(R.id.button_home); mUserInput = (EditText) findViewById(R.id.s_userinput); mUserOutput = (TextView) findViewById(R.id.s_useroutput); if (mClear != null) { mClear.setOnClickListener(this); } if (mHome != null) { mHome.setOnClickListener(this); } } public void onClick(View view) { if (view == mClear) { line.clear(); mUserInput.setText(getString(R.string.line_cleared)); //Use string ressource ! mUserOutput.setText(""); System.out.println("cleared"); // Use string ressource } else if (view == mHome) { Intent a = new Intent(this, MainActivity.class); startActivity(a); } } </code></pre> <p>You have to use thread to do some complex calcul, get your data. But the initialization of a user interface can't be done in a worker thread. You have to be on the main thread. As usual everything is here : <a href="http://developer.android.com/guide/components/processes-and-threads.html" rel="nofollow">http://developer.android.com/guide/components/processes-and-threads.html</a> </p>

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