How to set decrement counter in textview?

Question

Currently, I'm developing pattern lock application. In my application when user enter wrong pattern on that time pattern lock activity delay 30 second. And I am adding one textview on pattern lock activity that can display only text like "Please Wait 30 Seconds". So I want to replace that text "Please Wait 30 Seconds" in to the decrement counter.

Example: 30-29-28-27-----0 (automatically decrement counter value)

Here this my Textview xml:

  <TextView
    android:id="@+id/txtMessage"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="Please Wait 30 Seconds"
    android:gravity="center"
    android:textSize="25dp"
    android:textColor="@color/colorAccent"
    android:visibility="gone"/>

See android:text="Please Wait 30 Seconds" where I want to set decrement counter

This my activity code:

 private void invalidPattern() {

    failedCount ++;

    if (failedCount > LIMIT) {

        lock9View.setVisibility(View.GONE);
        txtMessage.setVisibility(View.VISIBLE);
        Animation zoomOutAnimation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.animation);
        txtMessage.startAnimation(zoomOutAnimation);

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                //reset the failed count
                failedCount = 0;
                lock9View.setVisibility(View.VISIBLE);
                txtMessage.setVisibility(View.GONE);
                //Enable the input interface here
            }
        }, 30000); // 30Sec delay
    }
    else
    {
        Log.i("Wrong....", "aa..else.....invalidPattern()");
    }
}

So, if anyone know give idea of that.

@Piyush it can display only limit like int LIMIT = 5; when i'm creating wrong pattern 5 time. I want to decreament value automatically when user enter wrong pattern 5 times....See my question for better understanding — vishal patel, Oct 14 '16 at 10:24

score 2 · Accepted Answer · answered Oct 14 '16 at 10:24

I think the good approach for your requirement is to use CountDownTimer. Below is the code, that demonstrates how you can use

XML layout file:

   <TextView
        android:id="@+id/txtMessage"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Please Wait 30 Seconds"
        android:gravity="center"
        android:textSize="25dp"
        android:textColor="@color/colorAccent"
        android:visibility="visible"/>

in JAVA file

    private TextView countDownTv;

    CountDownTimer mCountDownTimer = new CountDownTimer(30 * 1000, 1000) {
        @Override
        public void onTick(long millisUntilFinished) {
            //this will be called every second.
            countDownTv.setText("Please Wait " + (millisUntilFinished/1000) + " seconds.");
        }

        @Override
        public void onFinish() {
            //you are good to go.
            //30 seconds passed.
        }
    };

    @Override
    public void onCreate() {
        super.onCreate();
        //......
        countDownTv = (TextView) findViewById(R.id.txtMessage);

        //To start the timer...
        mCountDownTimer.start()
    }

score 0 · Answer 2 · answered Oct 14 '16 at 10:23

Use CountDownTimer

private class StoryCountDown extends CountDownTimer {

    public StoryCountDown(long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
    }

    @Override
    public void onTick(long millisUntilFinished) {
        mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
    }

    @Override
    public void onFinish() {
        mTextField.setText("done!");
    }
}

And use this class like below.

StoryCountDown countDownTimer = new StoryCountDown(30000, 1000);
countDownTimer.start();

score 0 · Answer 3 · answered Oct 14 '16 at 10:31

In addition to other answers:

Thread t = new Thread() {
        public void run() {             
            for (int i = 30; i > 0; i--) {                   
                try {
                    final int a = i;
                    runOnUiThread(new Runnable() {
                        public void run() {                        
                            txtMessage.setText("Please Wait "+ i +" seconds");                            
                        }                       
                    });
                    sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    };
    t.start();

How to set decrement counter in textview?

3 Answers3