本文实例为大家分享了Android实现缩放动画的具体代码，供大家参考，具体内容如下
核心方法
public void startAnimation(Animation animation)
执行动画，参数可以是各种动画的对象，Animation的多态，也可以是组合动画，后面会有。
4个参数构造方法
/**
* 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
*/
public ScaleAnimation(float fromX, float toX, float fromY, float toY) {
mResources = null;
mFromX = fromX;
mToX = toX;
mFromY = fromY;
mToY = toY;
mPivotX = 0;
mPivotY = 0;
}
用法
public void scale(View view) {
// 创建缩放的动画对象
ScaleAnimation sa = new ScaleAnimation(0f,1.0f,0f,1.0f);
// 设置动画播放的时间
sa.setDuration(1000);
// 开始播放动画
iv.startAnimation(sa);
}
效果
以图片左上角为原点，从没有，放大到图片原大小
6个参数构造方法
/**
* 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();
}
前4个参数和上面的用法一样，后两个参数是设置图片缩放的原点，四个参数的构造默认将这两个参数都设置了0，所以是在图片左上角开始缩放
用法
ScaleAnimation sa = new ScaleAnimation(0f, 1.0f, 0f, 1.0f, iv.getWidth() / 2, iv.getHeight() / 2); // 设置动画播放的时间 sa.setDuration(1000); // 开始播放动画 iv.startAnimation(sa);
效果
以图片的中心为原点，从没有放大到图片原大小
8个参数构造方法
/**
* 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 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 scaled, specified as an absolute number where 0 is the left edge. (This point remains fixed while the object changes size.) 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 scaled, specified as an absolute number where 0 is the top edge. (This point remains fixed while the object changes size.) This value can either be an absolute number if pivotYType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
*/
public ScaleAnimation(float fromX, float toX, float fromY, float toY, int pivotXType, float pivotXValue, int pivotYType, float pivotYValue) {
mResources = null;
mFromX = fromX;
mToX = toX;
mFromY = fromY;
mToY = toY;
mPivotXValue = pivotXValue;
mPivotXType = pivotXType;
mPivotYValue = pivotYValue;
mPivotYType = pivotYType;
initializePivotPoint();
}
用法
// 创建缩放的动画对象 ScaleAnimation sa = new ScaleAnimation(0f, 1.0f, 0f, 1.0f, ScaleAnimation.RELATIVE_TO_SELF, 0.5f, ScaleAnimation.RELATIVE_TO_SELF, 0.5f); // 设置动画播放的时间 sa.setDuration(1000); // 开始播放动画 iv.startAnimation(sa);
和上面6个参数的相比只是多了第5和第7个参数，分别设置他们的类型，注释里面已经说明了，可以设置Animation.ABSOLUTE、Animation.RELATIVE_TO_SELF、Animation.RELATIVE_TO_PARENT类型
效果
效果和上面一样，以图片的中心为原点，从没有放大到图片原大小。
设置动画重复播放的次数的方法
/**
* Sets how many times the animation should be repeated. If the repeat
* count is 0, the animation is never repeated. If the repeat count is
* greater than 0 or {@link #INFINITE}, the repeat mode will be taken
* into account. The repeat count is 0 by default.
*
* @param repeatCount the number of times the animation should be repeated
* @attr ref android.R.styleable#Animation_repeatCount
*/
public void setRepeatCount(int repeatCount) {
if (repeatCount < 0) {
repeatCount = INFINITE;
}
mRepeatCount = repeatCount;
}
使用
sa.setRepeatCount(2);
设置动画重复播放的模式的方法
/**
* Defines what this animation should do when it reaches the end. This
* setting is applied only when the repeat count is either greater than
* 0 or {@link #INFINITE}. Defaults to {@link #RESTART}.
*
* @param repeatMode {@link #RESTART} or {@link #REVERSE}
* @attr ref android.R.styleable#Animation_repeatMode
*/
public void setRepeatMode(int repeatMode) {
mRepeatMode = repeatMode;
}
使用
sa.setRepeatMode(ScaleAnimation.REVERSE);
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
