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

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。

<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_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

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。