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POUpdating UI on button click after a certain time
 

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    <p>I have a TextView. I want to update its text (append a "1") after 1 second of a button click.</p> <pre><code>public class HaikuDisplay extends Activity { Method m; Timer t; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); t = new Timer(); m = HaikuDisplay.class.getMethod("change"); } //Event handler of the button public void onRefresh(View view) { //To have the reference of this inside the TimerTask final HaikuDisplay hd = this; TimerTask task1 = new TimerTask(){ public void run(){ /* * I tried to update the text here but since this is not the UI thread, it does not allow to do so. */ //Calls change() method m.invoke(hd, (Object[])null); } }; t.schedule(task1, 1000); } public void change() { //Appends a "1" to the TextView TextView t = (TextView)findViewById(R.id.textView1); t.setText(t.getText() + "1"); } //Event handler of another button which updates the text directly by appending "2". //This works fine unless I click the first button. public void onRefresh1(View view) { TextView t = (TextView)findViewById(R.id.textView1); t.setText(t.getText() + "2"); } } </code></pre> <p>Consider all Exceptions be handled.</p> <p>On first click, <code>m.invoke</code> gives <code>InvocationTargetException</code>. But it calls the method <code>change()</code> on successive invokes without any Exceptions(verified by logging). But it does not update the text. Where am I wrong?</p> <p>Also, I see in the debugger that it creates a new Thread every time I click the button. That is fine. But why isn't it removing the previous Threads though their execution has been completed?</p>
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