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

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。

android:layout_width="200dp"

android:layout_height="200dp"

app:btn_img_res="@drawable/rd"

app:ripple_img_res="@drawable/rd">

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);

}

};

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持找一找教程网。