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tween animation:通过预先定义一组指令，指令指定了图形变幻的类型、触发时间、持续时间，对场景里的对象不断平移、缩放、旋转等变幻来产生动画效果。
animation是以xml格式定义的，定义好的xml文件放在"res/anim"目录中。
在xml文件中，tween动画主要包括以下四种动画效果：(箭头后是与之对应的java代码方法)
alpha:渐变透明-------------->alphaanimation
scale:伸缩 --------------->scaleanimation
translate:移动--------------->translateanimation
rotate:旋转 ---------------->rotateanimation
实现步骤：
1.定义animation对象
2.设置动画的属性
3.通过startanimation()方法开始动画
例子：
1.java代码：
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public class mainactivity extends appcompatactivity implements view.onclicklistener{
/**定义alpha动画*/
private animation animalpha=null;
/**定义scale动画*/
private animation animscale=null;
/**定义translate动画*/
private animation animtranslate=null;
/**定义rotate动画*/
private animation animrotate=null;
private imageview img;
private textview alpha,scale,translate,rotate;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
img=findviewbyid(r.id.iv_animation);
alpha=findviewbyid(r.id.alpha);
scale=findviewbyid(r.id.scale);
translate=findviewbyid(r.id.translate);
rotate=findviewbyid(r.id.rotate);
alpha.setonclicklistener(this);
scale.setonclicklistener(this);
translate.setonclicklistener(this);
rotate.setonclicklistener(this);
}
@override
public void onclick(view v) {
switch (v.getid()){
case r.id.alpha:
/**创建alpha动画*/
animalpha=new alphaanimation(0.1f,1.0f);
/**设置动画时间*/
animalpha.setduration(3000);
/**开始播放动画*/
img.startanimation(animalpha);
break;
case r.id.scale:
/**创建scale动画*/
animscale=new scaleanimation(0.0f,1.0f,0.0f,1.0f,
animation.relative_to_self,animation.relative_to_self);
/**设置动画时间*/
animscale.setduration(5000);
/**开始播放动画*/
img.startanimation(animscale);
break;
case r.id.translate:
/**创建translate动画*/
animtranslate=new translateanimation(10,100,10,100);
/**设置动画时间*/
animtranslate.setduration(1000);
/**开始播放动画*/
img.startanimation(animtranslate);
break;
case r.id.rotate:
/**创建translate动画*/
animrotate=new rotateanimation(0.0f,+360.0f,
animation.relative_to_self,0.5f,
animation.relative_to_self,0.5f);
/**设置动画时间*/
animrotate.setduration(1000);
/**开始播放动画*/
img.startanimation(animrotate);
break;
}
}
}
效果：
alpha: scale:
translate:rotate:
=======================================================================================
/**
* constructor to use when building an alphaanimation from code
*
* @param fromalpha starting alpha value for the animation, where 1.0 means
* fully opaque and 0.0 means fully transparent.
* @param toalpha ending alpha value for the animation.
*/
public alphaanimation(float fromalpha, float toalpha) {
mfromalpha = fromalpha;
mtoalpha = toalpha;
}
/**
* constructor to use when building a scaleanimation from code
*
* @param fromx horizontal scaling factor to apply at the start of the
* animation
* @param tox horizontal scaling factor to apply at the end of the animation
* @param fromy vertical scaling factor to apply at the start of the
* animation
* @param toy vertical scaling factor to apply at the end of the animation
* @param pivotx the x coordinate of the point about which the object is
* being scaled, specified as an absolute number where 0 is the left
* edge. (this point remains fixed while the object changes size.)
* @param pivoty the y coordinate of the point about which the object is
* being scaled, specified as an absolute number where 0 is the top
* edge. (this point remains fixed while the object changes size.)
*/
public scaleanimation(float fromx, float tox, float fromy, float toy,
float pivotx, float pivoty) {
mresources = null;
mfromx = fromx;
mtox = tox;
mfromy = fromy;
mtoy = toy;
mpivotxtype = absolute;
mpivotytype = absolute;
mpivotxvalue = pivotx;
mpivotyvalue = pivoty;
initializepivotpoint();
}
=====================================================================================
/**
* constructor to use when building a translateanimation from code
*
* @param fromxdelta change in x coordinate to apply at the start of the
* animation
* @param toxdelta change in x coordinate to apply at the end of the
* animation
* @param fromydelta change in y coordinate to apply at the start of the
* animation
* @param toydelta change in y coordinate to apply at the end of the
* animation
*/
public translateanimation(float fromxdelta, float toxdelta, float fromydelta, float toydelta) {
mfromxvalue = fromxdelta;
mtoxvalue = toxdelta;
mfromyvalue = fromydelta;
mtoyvalue = toydelta;
mfromxtype = absolute;
mtoxtype = absolute;
mfromytype = absolute;
mtoytype = absolute;
}
/**
* constructor to use when building a rotateanimation from code
*
* @param fromdegrees rotation offset to apply at the start of the
* animation.
*
* @param todegrees rotation offset to apply at the end of the animation.
*
* @param pivotxtype specifies how pivotxvalue should be interpreted. one of
* animation.absolute, animation.relative_to_self, or
* animation.relative_to_parent.
* @param pivotxvalue the x coordinate of the point about which the object
* is being rotated, specified as an absolute number where 0 is the
* left edge. this value can either be an absolute number if
* pivotxtype is absolute, or a percentage (where 1.0 is 100%)
* otherwise.
* @param pivotytype specifies how pivotyvalue should be interpreted. one of
* animation.absolute, animation.relative_to_self, or
* animation.relative_to_parent.
* @param pivotyvalue the y coordinate of the point about which the object
* is being rotated, specified as an absolute number where 0 is the
* top edge. this value can either be an absolute number if
* pivotytype is absolute, or a percentage (where 1.0 is 100%)
* otherwise.
*/
public rotateanimation(float fromdegrees, float todegrees, int pivotxtype, float pivotxvalue,
int pivotytype, float pivotyvalue) {
mfromdegrees = fromdegrees;
mtodegrees = todegrees;
mpivotxvalue = pivotxvalue;
mpivotxtype = pivotxtype;
mpivotyvalue = pivotyvalue;
mpivotytype = pivotytype;
initializepivotpoint();
}
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