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。
|
1
2
3
4
5
6
|
<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。
|
1
2
3
4
5
6
7
|
@Overrideprotected 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。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
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viewprivate 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。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
@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(); }} |
最后处理一下图片的onTouch事件。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
@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); }}; |
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服务器之家。
原文链接：https://blog.csdn.net/wu_liao_de_ren_sheng/article/details/51475886
