Android实现水波纹扩散效果
本文实例为大家分享了Android实现水波纹扩散效果的具体代码,供大家参考,具体内容如下
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先上图
囧!没有图片所以就拿了小安代替了。
先看一下如何使用这个View。
是的,没有别的代码了,就这么简单
实现思路
自定义ViewGroup,创建一个用显示图片的view,在创建几个,大小相同的ImageView。当按下时,对这几个ImageView进行放大和渐变。
代码
首先它肯定是一个正方形。
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, widthMeasureSpec); if (!mInitDataSucceed){ initData(); } }
显示图片的View的大小,该怎么给?这是个比较蛋疼的问题。给大了就看不到扩散效果了,给小,给多少的值合适呢?有没有正好的值,有的用父 view 的 size / 子 view 放大的倍数,这样肯定会达到理想的效果。
private static final int ANIMATION_EACH_OFFSET = 800; // 每个动画的播放时间间隔 private static final int RIPPLE_VIEW_COUNT = 3;//波纹view的个数 private static final float DEFAULT_SCALE = 1.6f;//波纹放大后的大小 //点击有扩散效果的view private CircleImageView mBtnImg; private int mBtnViewHeight; private int mBtnViewWidth; private float mScale = DEFAULT_SCALE; //图片资源 private int mBtnImgRes; private int mRippleRes; //是否初始化完成 private boolean mInitDataSucceed = false; private void initData(){ if (getMeasuredHeight() > 0 && getMeasuredWidth() > 0){ mInitDataSucceed = true; int height = getMeasuredHeight() - getPaddingTop() - getPaddingBottom(); int width = getMeasuredWidth() - getPaddingLeft() - getPaddingRight(); mBtnViewHeight = (int) (height / mScale); mBtnViewWidth = (int) (width / mScale); mBtnImg = new CircleImageView(getContext()); mBtnImg.setImageResource(mBtnImgRes); mBtnImg.setOnTouchListener(this); addView(mBtnImg, getWaveLayoutParams()); for (int i = 0; i < RIPPLE_VIEW_COUNT; i++){ //创建view CircleImageView wave = createWave(); mWaves.add(wave); //创建动画 mAnimas.add(getNewAnimationSet()); addView(wave, 0, getWaveLayoutParams()); } } } private CircleImageView createWave(){ CircleImageView CircleImageView = new CircleImageView(getContext()); CircleImageView.setScaleType(ImageView.ScaleType.CENTER_CROP); CircleImageView.setImageResource(mRippleRes); return CircleImageView; } private LayoutParams getWaveLayoutParams(){ LayoutParams lp = new LayoutParams(mBtnViewWidth, mBtnViewHeight); return lp; } private AnimationSet getNewAnimationSet() { AnimationSet as = new AnimationSet(true); ScaleAnimation sa = new ScaleAnimation(1f, mScale, 1f, mScale, ScaleAnimation.RELATIVE_TO_SELF, 0.5f, ScaleAnimation.RELATIVE_TO_SELF, 0.5f); sa.setDuration(ANIMATION_EACH_OFFSET * 3); sa.setRepeatCount(-1);// 设置循环 AlphaAnimation aniAlp = new AlphaAnimation(1, 0.1f); aniAlp.setRepeatCount(-1);// 设置循环 as.setDuration(ANIMATION_EACH_OFFSET * 3); as.addAnimation(sa); as.addAnimation(aniAlp); return as; }
View 都初始化完成了,好像还差一步,onLayout,只要把子 View 都显示到中先就可以了。
@Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { if (mInitDataSucceed) { int childLeft = (getMeasuredWidth() - mBtnViewWidth) / 2; int childTop = (getMeasuredHeight() - mBtnViewHeight) / 2; for (int i = 0; i < RIPPLE_VIEW_COUNT; i++) { CircleImageView wave = mWaves.get(i); wave.layout(childLeft, childTop, mBtnViewWidth + childLeft, mBtnViewHeight + childTop); } mBtnImg.layout(childLeft, childTop, mBtnViewWidth + childLeft, mBtnViewHeight + childTop); }else { initData(); } }
最后处理一下图片的onTouch事件。
@Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: showWaveAnimation(); break; case MotionEvent.ACTION_MOVE: break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: cancelWaveAnimation(); break; default: cancelWaveAnimation(); break; } return true; } private void showWaveAnimation() { for (int i = 0; i < RIPPLE_VIEW_COUNT; i++){ Message message = new Message(); message.obj = i; handler.sendMessageDelayed(message, ANIMATION_EACH_OFFSET * i); } } private void cancelWaveAnimation() { for (int i = 0; i < RIPPLE_VIEW_COUNT; i++){ CircleImageView wave = mWaves.get(i); wave.clearAnimation(); } } private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { int position = (int) msg.obj; CircleImageView wave = mWaves.get(position); wave.startAnimation(mAnimas.get(position)); super.handleMessage(msg); } };
参考地址:Android实现水波纹外扩效果
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