Android开发：带动画的分享效果

这几天做了个带动画的分享页面。如今把它分享出来，假设你认为实用，请直接使用，避免反复造轮子

先看下效果图

认为仅仅是看效果图不明显。那么用手机扫描以下的二维码下载安装包：

这个效果本身没有什么特别的难度，都是用Animator实现的，仅仅是动画效果的代码量有点多。由于分享模块一般都会做，把这个分享出来，想要用的话，就不要反复写这么多行代码了

对于熟悉Animator的人。以下的代码能够略过了

我来看下基本的实现代码，完整的代码看底部的项目Github地址

1. 我用了一个方法。实现进入的效果，加上判定，是否须要隐藏二维码页面

private void moveInAnim(boolean isHideCode) {
        ObjectAnimator friendAnimatorX = ObjectAnimator.ofFloat(tvFriend, "TranslationX", 0);
        ObjectAnimator friendAnimatorY = ObjectAnimator.ofFloat(tvFriend, "TranslationY", 0);
        ObjectAnimator timelineAnimatorX = ObjectAnimator.ofFloat(tvTimeline, "TranslationX", 0);
        ObjectAnimator timelineAnimatorY = ObjectAnimator.ofFloat(tvTimeline, "TranslationY", 0);
        ObjectAnimator qrcodeAnimatorX = ObjectAnimator.ofFloat(tvQrcode, "TranslationX", 0);
        ObjectAnimator qrcodeAnimatorY = ObjectAnimator.ofFloat(tvQrcode, "TranslationY", 0);
        ObjectAnimator copyAnimatorX = ObjectAnimator.ofFloat(tvCopylink, "TranslationX", 0);
        ObjectAnimator copyAnimatorY = ObjectAnimator.ofFloat(tvCopylink, "TranslationY", 0);

        AnimatorSet set = new AnimatorSet();
        set.setDuration(ANIM_TIME);

        if (isHideCode) {
            ObjectAnimator animatorX = ObjectAnimator.ofFloat(tvCode, "ScaleX", 0.1f);
            ObjectAnimator animatorY = ObjectAnimator.ofFloat(tvCode, "ScaleY", 0.1f);
            set.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    tvCode.setVisibility(View.INVISIBLE);
                }
            });
            set.playTogether(friendAnimatorX, friendAnimatorY, timelineAnimatorX, timelineAnimatorY
                    , qrcodeAnimatorX, qrcodeAnimatorY, copyAnimatorX, copyAnimatorY, animatorX, animatorY);
        } else {
            set.setInterpolator(new FastOutSlowInInterpolator());
            set.playTogether(friendAnimatorX, friendAnimatorY, timelineAnimatorX, timelineAnimatorY
                    , qrcodeAnimatorX, qrcodeAnimatorY, copyAnimatorX, copyAnimatorY);
        }

        set.start();
    }

在Animator中实现x轴跟Y轴，还有缩放的效果。有心人可能会发现，为什么我移动的參数都是0f呢，那么起始的值跑到哪里去了，请接着看第二点。

2. 初始化位置

tvFriend.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                tvFriend.getViewTreeObserver().removeOnPreDrawListener(this);
                tvFriend.setTranslationX(-screenWidth / 2);
                tvFriend.setTranslationY(-tvFriend.getHeight() * 2);
                return false;
            }
        });
        tvTimeline.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                tvTimeline.getViewTreeObserver().removeOnPreDrawListener(this);
                tvTimeline.setTranslationX(screenWidth / 2);
                tvTimeline.setTranslationY(-tvFriend.getHeight() * 2);
                return false;
            }
        });
        tvQrcode.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                tvQrcode.getViewTreeObserver().removeOnPreDrawListener(this);
                tvQrcode.setTranslationX(-screenWidth / 2);
                tvQrcode.setTranslationY(tvFriend.getHeight() * 2);
                return false;
            }
        });
        tvCopylink.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                tvCopylink.getViewTreeObserver().removeOnPreDrawListener(this);
                tvCopylink.setTranslationX(screenWidth / 2);
                tvCopylink.setTranslationY(tvFriend.getHeight() * 2);
                return false;
            }
        });

初始化位置的方法，要放在addOnPreDrawListener中，这就是为什么在上一点中，仅仅要把值设成0f就能够的原因

3. 移动出去的动画

private void moveOutAnim(boolean isFinishActivity, boolean isShowCode) {
        ObjectAnimator friendAnimatorX = ObjectAnimator.ofFloat(tvFriend, "TranslationX", -screenWidth / 2);
        ObjectAnimator friendAnimatorY = ObjectAnimator.ofFloat(tvFriend, "TranslationY", -tvFriend.getHeight() * 2);
        ObjectAnimator timelineAnimatorX = ObjectAnimator.ofFloat(tvTimeline, "TranslationX", screenWidth / 2);
        ObjectAnimator timelineAnimatorY = ObjectAnimator.ofFloat(tvTimeline, "TranslationY", -tvFriend.getHeight() * 2);
        ObjectAnimator qrcodeAnimatorX = ObjectAnimator.ofFloat(tvQrcode, "TranslationX", -screenWidth / 2);
        ObjectAnimator qrcodeAnimatorY = ObjectAnimator.ofFloat(tvQrcode, "TranslationY", tvFriend.getHeight() * 2);
        ObjectAnimator copyAnimatorX = ObjectAnimator.ofFloat(tvCopylink, "TranslationX", screenWidth / 2);
        ObjectAnimator copyAnimatorY = ObjectAnimator.ofFloat(tvCopylink, "TranslationY", tvFriend.getHeight() * 2);

        AnimatorSet set = new AnimatorSet();
        set.setDuration(ANIM_TIME);

        if (isShowCode) {
            addQrcode();
            ObjectAnimator animatorScaleX = ObjectAnimator.ofFloat(tvCode, "ScaleX", 1f);
            ObjectAnimator animatorScaleY = ObjectAnimator.ofFloat(tvCode, "ScaleY", 1f);
            animatorScaleX.setInterpolator(overshootInterpolator);
            animatorScaleY.setInterpolator(overshootInterpolator);
            set.playTogether(friendAnimatorX, friendAnimatorY, timelineAnimatorX, timelineAnimatorY
                    , qrcodeAnimatorX, qrcodeAnimatorY, copyAnimatorX, copyAnimatorY, animatorScaleX, animatorScaleY);
        } else {
            set.playTogether(friendAnimatorX, friendAnimatorY, timelineAnimatorX, timelineAnimatorY
                    , qrcodeAnimatorX, qrcodeAnimatorY, copyAnimatorX, copyAnimatorY);
        }

        if (isFinishActivity) {
            set.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    finish();
                    overridePendingTransition(0, 0);
                }
            });
        }

        set.start();
    }

跟移动进来的动画大同小异，我就不复述了

4. 刚開始打开页面的时候，启动动画的方法：

tvFriend.post(new Runnable() {
            @Override
            public void run() {
                moveInAnim(false);
            }
        });

用post的方法，能够非常好的实现一開始的动画，假设直接在onResume中调用，或者其它的地方调用。就会出现卡顿，至于为什么这种方法能够。或者说有没有更好的的方法，希望有熟悉handle之类的人来解释下，感谢了

5. 注意的地方
有些手机会有默认的页面切换动画，比方我的M2手机就是向左滑动。退出就是向右滑动，为了避免有些手机的默认动画，能够在启动页面和退出页面的代码后面，加上例如以下的代码，避免出现默认的切换效果

overridePendingTransition(0, 0);

项目的源码我放到了Github。欢迎查看！

有不论什么疑问或者探讨了，欢迎留言或者联系我