Question

I’m building a simple clock on android.

My problem is on the while loop, when I use Thread.sleep(5000) I get error: “Unhandled exception type InterruptedException“.

How should I run the loop so it works correctly? There aren’t too many lines of code so I copied it entirely, hopefully will be useful for somebody since I haven’t been able to find many examples of clocks.

public class MainActivity extends Activity {
    TextView hours;
    TextView minutes;
    Calendar c;
    int cur_hours;
    int cur_minutes;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.clock_home);
        hours = (TextView) findViewById(R.id.hours);
        minutes = (TextView) findViewById(R.id.minutes);
        while (true) {
            updateTime();
            Thread.sleep(5 * 1000); // Unhandled exception type InterruptedException
            }
        }

    public void updateTime() {
        c = Calendar.getInstance();
        hours.setText("" + c.get(Calendar.HOUR));
        minutes.setText("" + c.get(Calendar.MINUTE));
        }
    }

Answer 1

Thread.sleep throws InterruptedException, you need to either catch (or) rethrow.

Wrap Thread.sleep call inside try/catch

Example:

try
{
Thread.sleep(5 * 1000);
}catch(InterruptedException ie)
{
 //Log message if required.
}

EDIT:

As InterruptedException javadoc

Thrown when a thread is waiting, sleeping, or otherwise paused for a
long time and another thread interrupts it using the interrupt method
in class Thread