Timer for an editText Box : Only the original thread that created a view hierarchy can touch its views

Question

I am trying to make the edittext boxvibrate and change color momentarily if a wrong password is entered

final Drawable oldBackground = findViewById(R.id.email).getBackground();
TimerTask timerTask = new TimerTask() {
    @Override
    public void run() {
        MainActivty.this.findViewById(R.id.password).setBackground(oldBackground);
        MainActivty.this.findViewById(R.id.email).setBackground(oldBackground);
    }
};


Toast.makeText(MainActivty.this , valArray.get(0).toString(), Toast.LENGTH_SHORT).show();
findViewById(R.id.password).setBackgroundColor(Color.RED);
findViewById(R.id.email).setBackgroundColor(Color.RED);
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(500);Timer timer = new Timer();
timer.schedule(timerTask, 1000);

score 7 · Accepted Answer · edited May 23 '17 at 11:44

7

Timer task runs on a different thread. Ui should be update on the ui thread.

Use runOnUiThread or use a Handler.

          runOnUiThread(new Runnable(){

              @Override
              public void run(){
               // update ui here  
              }
           });

Handler

Handler m_handler;
Runnable m_handlerTask ;  
m_handler = new Handler();   
m_handlerTask = new Runnable()
{
  @Override 
  public void run() { 

    // do something  
    m_handler.postDelayed(m_handlerTask, 1000);    

  }
  };
 m_handlerTask.run();

You can also use a CountDown timer

Countdowntimer in minutes and seconds

edited May 23 '17 at 11:44

Community

1
1

answered Aug 31 '13 at 13:58

Raghunandan

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how would i call this – cxzp Aug 31 '13 at 14:02
put the `runOnUithread` part inside the timer task. or use a handler or use a count down timer. – Raghunandan Aug 31 '13 at 14:03

score 5 · Answer 2 · answered Sep 10 '17 at 19:39

you must use Timer by runOnUiThread Method Like This:

final TextView lblSSID = (TextView)findViewById(R.id.lblWifiSSID);
    new Timer().scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            runOnUiThread(new TimerTask() {
                @Override
                public void run() {
                    lblSSID.setText(networkConnection.getWifiName());
                }
            });
        }
    }, 0, 5000);

Timer for an editText Box : Only the original thread that created a view hierarchy can touch its views

2 Answers2