Android实现水波纹扩散效果_android教程

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Android实现水波纹扩散效果

发布时间：2019-08-08 发布网站：脚本宝典

脚本宝典收集整理的这篇文章主要介绍了Android实现水波纹扩散效果，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。

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

先上图

Android实现水波纹扩散效果

澹∶挥型计跃湍昧诵“泊媪恕

先看一下如何使用这个View。

 <jianpan.COM.mybutton.view.RippleDiffuse  android:layout_width="200dp"  android:layout_height="200dp"  app:BTn_img_res="@drawable/rd"  app:ripple_img_res="@drawable/rd"> </jianpan.com.mybutton.view.RippleDiffuse>

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_@R_360_2428@_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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