How to Fade In Fade Out text during a loading with Animator?

Question

I want fade in and fade out some text during a loading in my app. For begin i tried this in a loop with counter but it doesn't work. I tried this :

        int i = 0;
        for(i=0; i < 5; i++){
            batteryAnimator = ObjectAnimator.ofFloat(tvBattery, "alpha", 1).setDuration(600);
            batteryAnimator.setStartDelay(200);
            batteryAnimator.start();
            screenAnimator = ObjectAnimator.ofFloat(tvScreen, "alpha", 1).setDuration(600);
            screenAnimator.setStartDelay(1500);
            screenAnimator.start();
            sensorAnimator = ObjectAnimator.ofFloat(tvSensor, "alpha", 1).setDuration(600);
            sensorAnimator.setStartDelay(3000);
            sensorAnimator.start();
            wifiAnimator = ObjectAnimator.ofFloat(tvWifi, "alpha", 1).setDuration(600);
            wifiAnimator.setStartDelay(4500);
            wifiAnimator.start();


            batteryAnimator = ObjectAnimator.ofFloat(tvBattery, "alpha", 0).setDuration(600);
            batteryAnimator.setStartDelay(6000);
            batteryAnimator.start();
            screenAnimator = ObjectAnimator.ofFloat(tvScreen, "alpha", 0).setDuration(600);
            screenAnimator.setStartDelay(6000);
            screenAnimator.start();
            sensorAnimator = ObjectAnimator.ofFloat(tvSensor, "alpha", 0).setDuration(600);
            sensorAnimator.setStartDelay(6000);
            sensorAnimator.start();
            wifiAnimator = ObjectAnimator.ofFloat(tvWifi, "alpha", 0).setDuration(600);
            wifiAnimator.setStartDelay(6000);
            wifiAnimator.start();
    }

I tried to use batteryAnimator.setRepeatedMode(ValueAnimator.RESTART) and battery.Animator.setRepeatCount(ValueAnimator.INFINITE), i think i have to use a thing like this but the texts flash like a christmas tree..

If someone can help me..

Answer 1

Create this method. This will make your view (in your case, your TextView) fade in and out:

    public void fadeInAndOut(final View view) {
        ObjectAnimator fadeOut = ObjectAnimator.ofFloat(view, "alpha", 0f);
        fadeOut.setDuration(500);
        fadeOut.setInterpolator(new DecelerateInterpolator());

        ObjectAnimator fadeIn = ObjectAnimator.ofFloat(view, "alpha", 1f);
        fadeIn.setDuration(500);
        fadeIn.setInterpolator(new DecelerateInterpolator());

        AnimatorSet set = new AnimatorSet();
        set.play(fadeIn).after(fadeOut);

        set.start();
    }

Then, you need need call this function between some intervals. As an example, I am using CountDownTimer. It will be called 20 times with 1 second intervals.

new CountDownTimer(20000, 1000) {

    public void onTick(long millisUntilFinished) {
      //This will be called every time timer ticks
      fadeInAndOut(/*your TextView goes here*/)
    }

    public void onFinish() {
       //Timer is done. 
    }

}.start();