Android的 - 变化留有余量使用动画 [英] Android - Change left margin using animation

问题描述

我改变以下方式的图像视图的左边距：

ViewGroup.MarginLayoutParams的LayoutParams =（MarginLayoutParams）image.getLayoutParams（）; layoutParams.leftMargin =价值; image.setLayoutParams（的LayoutParams）;

我想在利润率的变化运用动画。任何线索？

我的尝试：

  ObjectAnimator objectAnimator = ObjectAnimator.ofFloat（形象，X，VALUE）;
objectAnimator.start（）;
 

这完美的作品，作为图像移动到指定的X值的动画中，然而的值 layoutParams.leftMargin 保持不变！所以我不能使用这种方法，因为如果我尝试使用 objectAnimator 之后的 layoutParams.leftMargin 的值更改为100值100，应用的价值是不正确的（200加，而不是100，效果如果在 objectAnimator 仍然eventhough我设置左边距按以下方式：

  layoutParams.leftMargin = 100;
 

解决方案

使用动画类，而不是ObjectAnimator。

 最终诠释newLeftMargin =＆LT;一些价值取代;
动画=新的动画（）{

    @覆盖
    保护无效applyTransformation（浮动interpolatedTime，变换T）{
        的LayoutParams PARAMS = yourView.getLayoutParams（）;
        params.leftMargin =（INT）（newLeftMargin * interpolatedTime）;
        yourView.setLayoutParams（PARAMS）;
    }
};
a.setDuration（500）; //在毫秒
yourView.startAnimation（一）;
 

请注意，您应该使用IE正确LayoutAnimation类，如果你的观点是那么的LinearLayout PARAMS的孩子应该LinearLayout.LayoutParams

I am changing the left margin of an image view in the following manner :

ViewGroup.MarginLayoutParams layoutParams = (MarginLayoutParams) image.getLayoutParams ();
layoutParams.leftMargin = VALUE;
image.setLayoutParams ( layoutParams );

I would like the change in margin to apply with animation. Any clues ?

What I tried :

ObjectAnimator objectAnimator = ObjectAnimator.ofFloat ( image , "x" , VALUE);
objectAnimator.start();

This works perfectly, as the image is moved to the specified X value with animation, HOWEVER the value of layoutParams.leftMargin remains unchanged !! So I cannot use this method, because if I try to change the value of layoutParams.leftMargin to 100 after using the objectAnimator with the value 100, the value applied is not correct ( 200 is applied instead of 100, the effect if the objectAnimator remains eventhough I am setting the left margin in the following manner :

layoutParams.leftMargin = 100;

解决方案

Use Animation class, not ObjectAnimator.

final int newLeftMargin = <some value>;
Animation a = new Animation() {

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        LayoutParams params = yourView.getLayoutParams();
        params.leftMargin = (int)(newLeftMargin * interpolatedTime);
        yourView.setLayoutParams(params);
    }
};
a.setDuration(500); // in ms
yourView.startAnimation(a);

Please note that you should use correct LayoutAnimation class i.e. if your view is the child of LinearLayout then params should be LinearLayout.LayoutParams

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