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.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 0.0f);
showAnim.setDuration(500);
view.startAnimation(showAnim);
view.setVisibility(View.VISIBLE);
2、GONE动画
TranslateAnimation hideAnim = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 1.0f,
Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 0.0f);
hideAnim.setDuration(500);
view.startAnimation(hideAnim);
view.setVisibility(View.GONE);
这里,最重要的是TranslateAnimation,进入这个构造函数:
/**
* Constructor to use when building a TranslateAnimation from code
*
* @param fromXType Specifies how fromXValue should be interpreted. One of
* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
* Animation.RELATIVE_TO_PARENT.
* @param fromXValue Change in X coordinate to apply at the start of the
* animation. This value can either be an absolute number if fromXType
* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
* @param toXType Specifies how toXValue should be interpreted. One of
* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
* Animation.RELATIVE_TO_PARENT.
* @param toXValue Change in X coordinate to apply at the end of the
* animation. This value can either be an absolute number if toXType
* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
* @param fromYType Specifies how fromYValue should be interpreted. One of
* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
* Animation.RELATIVE_TO_PARENT.
* @param fromYValue Change in Y coordinate to apply at the start of the
* animation. This value can either be an absolute number if fromYType
* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
* @param toYType Specifies how toYValue should be interpreted. One of
* Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or
* Animation.RELATIVE_TO_PARENT.
* @param toYValue Change in Y coordinate to apply at the end of the
* animation. This value can either be an absolute number if toYType
* is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
*/
public TranslateAnimation(int fromXType, float fromXValue, int toXType, float toXValue,
int fromYType, float fromYValue, int toYType, float toYValue) {
mFromXValue = fromXValue;
mToXValue = toXValue;
mFromYValue = fromYValue;
mToYValue = toYValue;
mFromXType = fromXType;
mToXType = toXType;
mFromYType = fromYType;
mToYType = toYType;
}
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%;
TranslateAnimation showAnim = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 1.0f,
Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 0.0f,
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。
new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 1.0f,
Animation.RELATIVE_TO_SELF, 0.0f,
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。