Android缩放动画 _Android

莫问天涯路几重，轻衫侧帽且从容。这篇文章主要讲述Android缩放动画相关的知识，希望能为你提供帮助。
android缩放动画核心方法

public void startAnimation(Animation animation)

运行动画，參数能够是各种动画的对象，Animation的多态。也能够是组合动画，后面会有。

4个參数构造方法

/** * 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; }

使用方法

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); // 開始播放动画 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个參数构造方法

/** * 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 = https://www.songbingjia.com/android/pivotX; mPivotYValue = pivotY; initializePivotPoint(); }

前4个參数和上面的使用方法一样，后两个參数是设置图片缩放的原点，四个參数的构造默认将这两个參数都设置了0，所以是在图片左上角開始缩放

使用方法

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); // 開始播放动画 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个參数构造方法

/** * 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 = https://www.songbingjia.com/android/pivotXValue; mPivotXType = pivotXType; mPivotYValue = pivotYValue; mPivotYType = pivotYType; initializePivotPoint(); }

使用方法

// 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); // 開始播放动画 iv.startAnimation(sa);

和上面6个參数的相比仅仅是多了第5和第7个參数，分别设置他们的类型，凝视里面已经说明了。能够设置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。
设置动画反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);

设置动画反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; }

【Android缩放动画】使用