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POresolve 'called from wrong thread' exception
 

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    <p>The purpose of my app is: User enters a number and clicks a button. The button uses the input to calculate the Fibonacci sequence with a timer - with each number in the sequence displaying each second to a textView. But when I try to run the timer I get the CalledFromWrongThreadException. I've posted my code below. As you can tell by my log statements I believe I know which line is causing the problem. I think it's because I'm calling a method which is outside my onclicklistener but when I move that other method around I just cause more problems.</p> <p>I've read a couple other posts and I'm not really sure what the proper way is to print to a text area using my method. Does anyone know how I can make this work? </p> <pre><code>public class MainActivity extends Activity { // primary widgets private EditText editText; private TextView textView; private Button button1; static int seconds = 0; static Timer timer; static ArrayList&lt;Integer&gt; fibList = new ArrayList&lt;Integer&gt;(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); editText = (EditText) findViewById(R.id.editText1); textView = (TextView) findViewById(R.id.textView2); button1 = (Button) findViewById(R.id.button1); final int delay = 1000; final int period = 1000; timer = new Timer(); //Attempt to clear TextView textView.setText(""); button1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //Clear Textview String array = " "; fibList.clear(); textView.setText(array); //Log.i("ARRAY", "ATTEMPT to CLEAR"+fibList); String input = editText.getText().toString(); int number = Integer.parseInt(input); int tmp = 0; // confirm input if (number &lt; 20) { Toast.makeText(getApplicationContext(), "You entered: " + number, Toast.LENGTH_LONG).show(); for (int i = 0; i &lt;= number; i++) { fibList.add(fib(i)); // sum even numbers if (fib(i) % 2 == 0) { tmp += fib(i); } } } else { Toast.makeText(getApplicationContext(), "Number is too Large: " + number, Toast.LENGTH_LONG) .show(); } //I believe error occurs in this method Log.i("TEST", "START TIMER"); timer.scheduleAtFixedRate(new TimerTask() { public void run() { Log.i("TEST", "RUN TIMER"); int nextIndex = setInterval(); Log.i("TEST", "SET INTERVAL"); if (nextIndex &lt; fibList.size()) { Log.i("TEST", "TRY TO PRINT"); //It looks like error occurs here when I try to print to textView textView.setText(fibList.get(nextIndex)+ " "); Log.i("TEST", "NEXT INDEX"+fibList.get(nextIndex)); Log.i("TEST", "DID PRINT"); } } }, delay, period); Log.i("TEST", "END TIMER"); } }); } // run fibonacci sequence public static int fib(int n) { if (n &lt; 2) { return n; } else { return fib(n - 1) + fib(n - 2); } } //counts up for every element through the array public static final int setInterval() { if (seconds &gt;= fibList.size()) timer.cancel(); return seconds++; } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } </code></pre> <p>}</p>
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    1. USDavid
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    1. COany time you have an Exception error, you should post the logcat
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      1. POresolve 'called from wrong thread' exception
      1. USJustinMorris
 

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