安卓笔记：为View设置VISIBLE、GONE的时候添加过度动画
【摘要】
直接上代码：
1、VISIBLE动画
TranslateAnimation showAnim = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 1.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIV...
直接上代码：
1、VISIBLE动画
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TranslateAnimation showAnim = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 1.0f,
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Animation.RELATIVE_TO_SELF, 0.0f,
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Animation.RELATIVE_TO_SELF, 0.0f,
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Animation.RELATIVE_TO_SELF, 0.0f);
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showAnim.setDuration(500);
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view.startAnimation(showAnim);
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view.setVisibility(View.VISIBLE);
2、GONE动画
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TranslateAnimation hideAnim = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
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Animation.RELATIVE_TO_SELF, 1.0f,
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Animation.RELATIVE_TO_SELF, 0.0f,
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Animation.RELATIVE_TO_SELF, 0.0f);
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hideAnim.setDuration(500);
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view.startAnimation(hideAnim);
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view.setVisibility(View.GONE);
这里，最重要的是TranslateAnimation，进入这个构造函数：
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/**
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* Constructor to use when building a TranslateAnimation from code
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*
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* @param fromXType Specifies how fromXValue should be interpreted. One of
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* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
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* Animation.RELATIVE_TO_PARENT.
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* @param fromXValue Change in X coordinate to apply at the start of the
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* animation. This value can either be an absolute number if fromXType
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* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
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* @param toXType Specifies how toXValue should be interpreted. One of
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* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
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* Animation.RELATIVE_TO_PARENT.
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* @param toXValue Change in X coordinate to apply at the end of the
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* animation. This value can either be an absolute number if toXType
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* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
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* @param fromYType Specifies how fromYValue should be interpreted. One of
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* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
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* Animation.RELATIVE_TO_PARENT.
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* @param fromYValue Change in Y coordinate to apply at the start of the
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* animation. This value can either be an absolute number if fromYType
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* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
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* @param toYType Specifies how toYValue should be interpreted. One of
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* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
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* Animation.RELATIVE_TO_PARENT.
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* @param toYValue Change in Y coordinate to apply at the end of the
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* animation. This value can either be an absolute number if toYType
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* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
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*/
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public TranslateAnimation(int fromXType, float fromXValue, int toXType, float toXValue,
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int fromYType, float fromYValue, int toYType, float toYValue) {
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mFromXValue = fromXValue;
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mToXValue = toXValue;
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mFromYValue = fromYValue;
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mToYValue = toYValue;
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mFromXType = fromXType;
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mToXType = toXType;
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mFromYType = fromYType;
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mToYType = toYType;
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}
可以看到，这个构造函数主要是传入设置起始点坐标(x,y)、终点坐标(x,y)，每个坐标值对应一个类型type。
Animation.RELATIVE_TO_SELF代表着坐标以当前view为基准。
0.0f即0%，代表view初始位置坐标；
1.0f即100%，代表以view初始位置为原点，相应x坐标/y坐标增加父宽度/父高度的100%；
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TranslateAnimation showAnim = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 1.0f,
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Animation.RELATIVE_TO_SELF, 0.0f,
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Animation.RELATIVE_TO_SELF, 0.0f,
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Animation.RELATIVE_TO_SELF, 0.0f);
表示从（1.0f,0.0f）移动到（0.0f,0.0f），即view从屏幕右侧不可见区域移动到初始位置，符合VISIBLE效果。
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new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
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Animation.RELATIVE_TO_SELF, 1.0f,
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Animation.RELATIVE_TO_SELF, 0.0f,
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Animation.RELATIVE_TO_SELF, 0.0f);
表示从（0.0f,0.0f）移动到（1.0f,0.0f），即view从初始位置移动到屏幕右侧不可见区域，符合GONE效果。
文章来源: chengsy.blog.csdn.net，作者：程思扬，版权归原作者所有，如需转载，请联系作者。
原文链接：chengsy.blog.csdn.net/article/details/82661550
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