本文實例為大家分享了Android實現水波紋擴散效果的具體代碼，供大家參考，具體內容如下
先上圖
囧！沒有圖片所以就拿了小安代替了。
先看一下如何使用這個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，沒有別的代碼了，就這么簡單
實現思路
自定義ViewGroup，創建一個用顯示圖片的view，在創建幾個，大小相同的ImageView。當按下時，對這幾個ImageView進行放大和漸變。
代碼
首先它肯定是一個正方形。
@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, widthMeasureSpec); if (!mInitDataSucceed){ initData(); }}顯示圖片的View的大小，該怎么給？這是個比較蛋疼的問題。給大了就看不到擴散效果了，給小，給多少的值合適呢？有沒有正好的值，有的用父 view 的 size / 子 view 放大的倍數，這樣肯定會達到理想的效果。
private static final int ANIMATION_EACH_OFFSET = 800; // 每個動畫的播放時間間隔private static final int RIPPLE_VIEW_COUNT = 3;//波紋view的個數private static final float DEFAULT_SCALE = 1.6f;//波紋放大后的大小//點擊有擴散效果的viewprivate CircleImageView mBtnImg;private int mBtnViewHeight;private int mBtnViewWidth;private float mScale = DEFAULT_SCALE;//圖片資源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++){ //創建view CircleImageView wave = createWave(); mWaves.add(wave); //創建動畫 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);// 設置循環 AlphaAnimation aniAlp = new AlphaAnimation(1, 0.1f); aniAlp.setRepeatCount(-1);// 設置循環 as.setDuration(ANIMATION_EACH_OFFSET * 3); as.addAnimation(sa); as.addAnimation(aniAlp); return as;}View 都初始化完成了，好像還差一步，onLayout，只要把子 View 都顯示到中先就可以了。
@Overrideprotected 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(); }}最后處理一下圖片的onTouch事件。
@Overridepublic 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); }};以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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