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。
@Override
protected 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view
private 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。
@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();
}
}
最后處理一下圖片的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);
}
};
參考地址：Android實現水波紋外擴效果
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億速云。
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