Timertask Error: Looper.prepare() not called

Question

I got this mistake.

Can’t create Handler Inside thread that has not called Looper.prepare()

The goal is to repeat the function that receives the map every 1000 thousandths of a second.

Timer t = new Timer();
//Set the schedule function and rate
        t.scheduleAtFixedRate(new TimerTask() {

                                  @Override
                                  public void run() {
                                      try {
                                          recebemapa();
                                      } catch (UnsupportedEncodingException e) {
                                          e.printStackTrace();
                                      }
                                  }

                              },
//Set how long before to start calling the TimerTask (in milliseconds)
                0,

//Set the amount of time between each execution (in milliseconds)
                1000);

I call this code in the method OnCreate()

Answer 1

I suppose the problem might be in the method recebemapa() have code that can only be executed on UI thread.
If so use the method runOnUiThread() to execute this code:

Timer t = new Timer();
t.scheduleAtFixedRate(new TimerTask() {

      @Override
      public void run() {
              runOnUiThread(new Runnable()
              {
                  public void run()
                  {
                      try {
                          recebemapa();
                      } catch (UnsupportedEncodingException e) {
                          e.printStackTrace();
                      }
                  }
              });
      }

 },0, 1000);  

An alternative(perhaps better) is to use a Handler(in this case it must be created in the UI Thread, which is the case of onCreate())

final Handler handler = new Handler();

Runnable runnable = new Runnable() {
    @Override
    public void run() {
        try {
            recebemapa();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        handler.postDelayed(this, 1000);
    }
};
handler.postDelayed(runnable, 0);