android 视图暂时显示在动画之前的最终位置

Question

当我们进入 activity 时，我正在为视图设置动画以向上滑动到其最终位置。我的问题是视图在开始时暂时出现在最终位置，然后跳转到初始位置然后动画开始。我该如何防止这种情况？

代码

protected void onResume() {
    mImageView.setVisibility(View.INVISIBLE);
    super.onResume();
    Animator animator = new ObjectAnimator();
    animator = AnimatorInflater.loadAnimator(this,R.animator.slide_up_lock_icon);
    //animator.setStartDelay(500);
    animator.setTarget(mImageView);
    animator.setInterpolator(new AccelerateDecelerateInterpolator());
    mImageView.setVisibility(View.VISIBLE);
    animator.start();

动画师XML:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectAnimator
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="1000"
    android:propertyName="translationY"
    android:valueFrom="500"
    android:valueTo="0"
    android:valueType="floatType"
    android:startOffset="500"
    />

设置和重置可见性有所帮助，但动画始终无法正常工作

Answer 1

您必须移动 mImageView 到动画开始的位置。

一种方法是在动画开始前mImageView.setTranslationY(500)..

像这样：

 mImageView.setVisibility(View.INVISIBLE);
 mImageView.setTranslationY(500);

 Animator animator = new ObjectAnimator();
 animator = AnimatorInflater.loadAnimator(this,R.animator.slide_up_lock_icon);
 //animator.setStartDelay(500);
 animator.setTarget(mImageView);
 animator.setInterpolator(new AccelerateDecelerateInterpolator());
 mImageView.setVisibility(View.VISIBLE);
 animator.start();

希望对您有所帮助..！

Answer 2

也许这可以解决您的问题。

Activity

protected void onResume() {
    super.onResume();
    //Here tv is your view
    tv.setVisibility(View.GONE);
    //Create an animation
    Animation animation = AnimationUtils.loadAnimation(this, R.anim.slide_up_lock_icon);
    //Set your view's visibility to Visible
    tv.setVisibility(View.VISIBLE);
    //Start animation on tv
    tv.startAnimation(animation);
}

资源动画

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
  <translate
      android:duration="1000"
      android:fromYDelta="yourValueHere%"
      android:toYDelta="otherValueHere" />
</set>

android 视图暂时显示在动画之前的最终位置

android view momentarily shows at final position before animation

android

android-animation