Question

my application is question/answer application , the user ask for a question , then the server send question to a user, when user receives the question , a ShowQuestion button appears , when user click it , i want to start timer , because a user have to answer in just 36 Second
i build a textView in my xml like this

<TextView
        android:id="@+id/tvRemaingTime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="visible" 
/>

and in my Java activity i make this

TextView remaingTimer;
CountDownTimer timer;
private void initialize() {
remaingTimer=(TextView)findViewById(R.id.tvRemaingTime);
}

and when a user click ShowQuestion i make this

timer =new CountDownTimer(360000,100) {
   public void onTick(long millisUntilFinished) {
        remaingTimer.setText(millisUntilFinished+"");
   }
   public void onFinish() {
    remaingTimer.setText("finish");
   }
};
timer.start();

but it doesn’t print anything, what am i doing wrong ?

NOTE

i am using AsyncTask to get question from server like this:

public class getQuestionFromServer extends
    AsyncTask<String, Integer, String[]> {}

but i don’t thing it effect on textView because the ShowQuestion button will not appear else a user have got a question from the server

Answer 1

you can use runOnUiThread for updateing TextView from Thread as:

TextView remaingTimer;
CountDownTimer timer;
private boolean mClockRunning=false;
private int millisUntilFinished=36;
private void initialize() {
remaingTimer=(TextView)findViewById(R.id.tvRemaingTime);
}
 ShowQuestionbutn.setOnClickListener(new OnClickListener() {    
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if(mClockRunning==false)
                {
                    mClockRunning=true;
                    millisUntilFinished=0;
                    myThread();
                }
    public void myThread(){
            Thread th=new Thread(){

             @Override
             public void run(){
              try
              {

               while(mClockRunning)
               {
               Thread.sleep(100L);// set time here for refresh time in textview
               CountDownTimerActivity.this.runOnUiThread(new Runnable() {

                @Override
                public void run() {
                 // TODO Auto-generated method stub
                     if(mClockRunning)
                     {
                                                                                                       if(millisUntilFinished<0)
               {
               mClockRunning=false;
               millisUntilFinished=36;
                }
                else
                {
               millisUntilFinished--;
               remaingTimer.setText(millisUntilFinished+"");//update textview here
               }
                     }

            };
                       }
              }catch (InterruptedException e) {
            // TODO: handle exception
             }
             }
            };
            th.start();
           }