如何在使用Animator加载时淡入淡出文本？

Question

我希望在加载应用程序时淡入和淡出一些文本。首先，我尝试使用计数器循环进行此操作，但无法正常工作。我试过了：

        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();
    }

[我尝试使用batteryAnimator.setRepeatedMode（ValueAnimator.RESTART）和battery.Animator.setRepeatCount（ValueAnimator.INFINITE），我认为我必须使用类似的东西，但是文本像圣诞树一样闪烁。

[如果有人可以帮助我。.

Answer 1

创建此方法。这会使您的视图（以您的情况为TextView）淡入和淡出：

    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();
    }

然后，您需要在某些时间间隔之间调用此函数。例如，我正在使用CountDownTimer。它将以1秒的间隔被调用20次。

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();