Android布局动画---给你的View闪亮登场

来源：互联网发布：淘宝关键词重复编辑：程序博客网时间：2024/05/13 18:39

1、概述

首先。什么是布局动画。就是ViewGroup在布局时产生的动画。（不仅仅局限于添加View，也包括删除View或者导致位置变化等一系列原因，我们都可以认为是布局动画）

2、LayoutTransition动画

通过LayoutTransition，我们可以实现ViewGroup在添加子View时的动画过度效果。过度动画可以分为以下几种类型

LayoutTransition.APPEARING 当一个View在ViewGroup中出现时，对此View设置的动画

LayoutTransition.CHANGE_APPEARING当一个View在ViewGroup中出现时，对此View对其他View位置造成影响，对其他View设置的动画

LayoutTransition.DISAPPEARING当一个View在ViewGroup中消失时，对此View设置的动画

LayoutTransition.CHANGE_DISAPPEARING当一个View在ViewGroup中消失时，对此View对其他View位置造成影响，对其他View设置的动画

LayoutTransition.CHANGE 不是由于View出现或消失造成对其他View位置造成影响，然后对其他View设置的动画。

public class AnimateLayoutTransition extends Activity {     private LinearLayout ll;    private LayoutTransition mTransition = new LayoutTransition();     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.animate_layout_transition);         ll = (LinearLayout) findViewById(R.id.ll);        setupCustomAnimations();        ll.setLayoutTransition(mTransition);    }     public void add(View view) {        final Button button = new Button(this);        ll.addView(button);        button.setOnClickListener(new OnClickListener() {             @Override            public void onClick(View arg0) {                ll.removeView(button);            }        });    }     // 生成自定义动画    private void setupCustomAnimations() {        // 动画：CHANGE_APPEARING        // Changing while Adding        PropertyValuesHolder pvhLeft = PropertyValuesHolder.ofInt("left", 0, 1);        PropertyValuesHolder pvhTop = PropertyValuesHolder.ofInt("top", 0, 1);        PropertyValuesHolder pvhRight = PropertyValuesHolder.ofInt("right", 0,                1);        PropertyValuesHolder pvhBottom = PropertyValuesHolder.ofInt("bottom",                0, 1);        PropertyValuesHolder pvhScaleX = PropertyValuesHolder.ofFloat("scaleX",                1f, 0f, 1f);        PropertyValuesHolder pvhScaleY = PropertyValuesHolder.ofFloat("scaleY",                1f, 0f, 1f);         final ObjectAnimator changeIn = ObjectAnimator.ofPropertyValuesHolder(                this, pvhLeft, pvhTop, pvhRight, pvhBottom, pvhScaleX,                pvhScaleY).setDuration(                mTransition.getDuration(LayoutTransition.CHANGE_APPEARING));        mTransition.setAnimator(LayoutTransition.CHANGE_APPEARING, changeIn);        changeIn.addListener(new AnimatorListenerAdapter() {            public void onAnimationEnd(Animator anim) {                View view = (View) ((ObjectAnimator) anim).getTarget();                // View也支持此种动画执行方式了                view.setScaleX(1f);                view.setScaleY(1f);            }        });         // 动画：CHANGE_DISAPPEARING        // Changing while Removing        Keyframe kf0 = Keyframe.ofFloat(0f, 0f);        Keyframe kf1 = Keyframe.ofFloat(.9999f, 360f);        Keyframe kf2 = Keyframe.ofFloat(1f, 0f);        PropertyValuesHolder pvhRotation = PropertyValuesHolder.ofKeyframe(                "rotation", kf0, kf1, kf2);        final ObjectAnimator changeOut = ObjectAnimator                .ofPropertyValuesHolder(this, pvhLeft, pvhTop, pvhRight,                        pvhBottom, pvhRotation)                .setDuration(                        mTransition                                .getDuration(LayoutTransition.CHANGE_DISAPPEARING));        mTransition                .setAnimator(LayoutTransition.CHANGE_DISAPPEARING, changeOut);        changeOut.addListener(new AnimatorListenerAdapter() {            public void onAnimationEnd(Animator anim) {                View view = (View) ((ObjectAnimator) anim).getTarget();                view.setRotation(0f);            }        });         // 动画：APPEARING        // Adding        ObjectAnimator animIn = ObjectAnimator.ofFloat(null, "rotationY", 90f,                0f).setDuration(                mTransition.getDuration(LayoutTransition.APPEARING));        mTransition.setAnimator(LayoutTransition.APPEARING, animIn);        animIn.addListener(new AnimatorListenerAdapter() {            public void onAnimationEnd(Animator anim) {                View view = (View) ((ObjectAnimator) anim).getTarget();                view.setRotationY(0f);            }        });         // 动画：DISAPPEARING        // Removing        ObjectAnimator animOut = ObjectAnimator.ofFloat(null, "rotationX", 0f,                90f).setDuration(                mTransition.getDuration(LayoutTransition.DISAPPEARING));        mTransition.setAnimator(LayoutTransition.DISAPPEARING, animOut);        animOut.addListener(new AnimatorListenerAdapter() {            public void onAnimationEnd(Animator anim) {                View view = (View) ((ObjectAnimator) anim).getTarget();                view.setRotationX(0f);            }        });     }}

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