Question

我的TranslateAnimation有效，但在动画结束时，它会跳回到原始位置。

        LinearLayout rl = (LinearLayout) findViewById(R.id.navPanel);

          animation = new TranslateAnimation(
              Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f,
              Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 3.0f
          );
          animation.setDuration(500);

          rl.startAnimation(animation);

如何在终点位置保持？

Answer 1

旧的（3.0之前版本）动画API表现得有些奇怪 - 当它动画时，它只是转换绘制视图的位置，但实际上并不会相对于父视图移动视图。

为了在动画完成后让视图保持不变，您可以在Animation.AnimationListener上设置TranslateAnimation。在侦听器的onAnimationEnd()方法中，您可以通过操纵视图上的LayoutParams将视图移动到最终的静止位置。

Answer 2

使用animation.setFillAfter(true)让动画在翻译结束时停止播放。

http://developer.android.com/reference/android/view/animation/Animation.html#setFillAfter(boolean）

Answer 3

同样的问题https://stackoverflow.com/a/6519233/1253065

使用 animation.setFillAfter（true），animation.setFillEnabled（true）

Answer 4

为避免重复代码，您可以继承AnimatorListenerAdapter并创建自己的AnimatorListener类，在动画后重新附加视图，然后在需要的地方使用它而不是默认的AnimatorListener。

班级：

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.RelativeLayout;

public class PersistViewAnimatorListener extends AnimatorListenerAdapter {

    private View view; // keep a reference to the view
    public PersistViewAnimatorListener(View view) {
        this.view = view;
    }

    @Override public void onAnimationEnd(Animator animation) {
        super.onAnimationEnd(animation);

        // re-attach the view to its parent at its new location
        if (view == null) { return; } // defensive, the view may have been removed while it was animated, do nothing in this case

        ViewGroup parent = (ViewGroup) view.getParent(); // get the parent
        if (parent == null) { return; } // defensive
        int index = parent.indexOfChild(view); // get the index of the view
        parent.removeView(view); // remove the view

        if (parent.getClass().equals(RelativeLayout.class)) { // RELATIVE LAYOUT
            RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(view.getLayoutParams()); // add the view back at its index with new layout parameters
            layoutParams.setMargins(Math.round(view.getX()), Math.round(view.getY()), 0, 0); // left, top, right, bottom; round the float to int
            parent.addView(view, index, layoutParams);
        } else if (parent.getClass().equals(FrameLayout.class)) { // FRAME LAYOUT
            FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(view.getLayoutParams()); // the same for FrameLayout
            layoutParams.setMargins(Math.round(view.getX()), Math.round(view.getY()), 0, 0);
            parent.addView(view, index, layoutParams);
        } else { // currently no further layouts supported, implement these here
            throw new UnsupportedOperationException("PersistViewAnimatorListener is currently only supported where the parent is either RelativeLayout or FrameLayout.");
        }

        view.setTranslationX(0); view.setTranslationY(0); // reset translated values from the animation

    }
}

以及如何使用它：

view.animate().yBy(height).setListener(new PersistViewAnimatorListener(view)); // call your custom listener in .setListener() and pass in the view

此解决方案假设您正在为父级使用RelativeLayout或FrameLayout。此外，它只关心位置，而不是大小或其他可以动画的属性。

完成后，TranslateAnimation跳回到开始点

4 个答案: