Xamarin,Android:动画有点滞后(使用Timers)

时间:2017-09-26 20:23:20

标签: android timer

我正在尝试从XML动画我的ImageView。它基本上从中心位置移动到屏幕顶部。实现这一点,我使用了一个每x毫秒触发一个函数的计时器。然后,此功能将对象进一步向上移动。它确实有效,但它是滞后的。我在三星S7上进行调试,所以功率应该不是问题。我猜计时器非常不准确。你能告诉我一个更好的方法,而不是这个:

 public class finalPhoto : Activity
    {
        private System.Timers.Timer timer;
        private ImageView wowThatLooksFantastic;
        private float i = 0f;
        private int test = 0; 
        private int NegativeSpeed = 350; 
        private int frameRate = 17; // 17 = etwa 60fps

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            SetContentView(Resource.Layout.finalPhoto);

            wowThatLooksFantastic = FindViewById<ImageView>(Resource.Id.text_wowthatlooksfantastic);

            wowThatLooksFantastic.Click += delegate { StartAnimation(); };

            test = Resources.DisplayMetrics.HeightPixels; 


        }
    private void StartAnimation()
    {
        i = wowThatLooksFantastic.GetY();
        CountDown(); 
    }

    public void CountDown()
    {

        timer = new System.Timers.Timer();
        timer.Interval = frameRate;
        timer.Elapsed += OnTimedEvent;
        timer.Start(); 

    }

    protected override void OnResume()
    {
        base.OnResume();
    }


    public void OnTimedEvent(object sender, System.Timers.ElapsedEventArgs e)
    {
        i -= (test/NegativeSpeed); 
        wowThatLooksFantastic.SetY(i);

        if (wowThatLooksFantastic.GetY() <= 50) // Endposition
        {
            timer.Stop(); 
        }

    }
}

1 个答案:

答案 0 :(得分:1)

为什么所有代码​​,只需在Resources / drawable XML文件文件中定义,例如move_up.xml

<?xml version="1.0" encoding="utf-8"?>
<set
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/linear_interpolator"
    android:fillAfter="true">

    <translate
        android:fromYDelta="50%p"
        android:toYDelta="0%p"
        android:duration="1000" />
</set>

这意味着它将从屏幕的Y位置中心开始并转到顶部。在持续时间中,您需要移动多少毫秒。 而不仅仅是你的imageView添加这个

   Animation anim2 = AnimationUtils.LoadAnimation(this.BaseContext, Resource.Drawable.move_up);
   ImageView myImage = FindViewById<ImageView>(Resource.Id.imageView1);
   myImage.StartAnimation(anim2);