最近看到360、UC、网易新闻客户端都应用了水波纹效果，就在私下里也研究了一下，参照GIT上大神的分享，自己也跟着做了一个Android 实现RippleEffect水波纹示例，下面先看效果：
1.RippleEffect核心实现类
package com.example.RippleEffect;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.os.Handler;
import android.support.annotation.ColorRes;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.widget.AdapterView;
import android.widget.RelativeLayout;
/**
* RippleView custom layout
*
* Custom Layout that allows to use Ripple UI pattern above API 21
*/
public class RippleView extends RelativeLayout {
private int WIDTH;
private int HEIGHT;
private int frameRate = 10;
private int rippleDuration = 400;
private int rippleAlpha = 90;
private Handler canvasHandler;
private float radiusMax = 0;
private boolean animationRunning = false;
private int timer = 0;
private int timerEmpty = 0;
private int durationEmpty = -1;
private float x = -1;
private float y = -1;
private int zoomDuration;
private float zoomScale;
private ScaleAnimation scaleAnimation;
private Boolean hasToZoom;
private Boolean isCentered;
private Integer rippleType;
private Paint paint;
private Bitmap originBitmap;
private int rippleColor;
private int ripplePadding;
private GestureDetector gestureDetector;
private final Runnable runnable = new Runnable() {
@Override
public void run() {
invalidate();
}
};
private OnRippleCompleteListener onCompletionListener;
public RippleView(Context context) {
super(context);
}
public RippleView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
public RippleView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context, attrs);
}
/**
* Method that initializes all fields and sets listeners
*
* @param context Context used to create this view
* @param attrs Attribute used to initialize fields
*/
private void init(final Context context, final AttributeSet attrs) {
if (isInEditMode())
return;
final TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RippleView);
rippleColor = typedArray.getColor(R.styleable.RippleView_rv_color, getResources().getColor(R.color.rippelColor));
rippleType = typedArray.getInt(R.styleable.RippleView_rv_type, 0);
hasToZoom = typedArray.getBoolean(R.styleable.RippleView_rv_zoom, false);
isCentered = typedArray.getBoolean(R.styleable.RippleView_rv_centered, false);
rippleDuration = typedArray.getInteger(R.styleable.RippleView_rv_rippleDuration, rippleDuration);
frameRate = typedArray.getInteger(R.styleable.RippleView_rv_framerate, frameRate);
rippleAlpha = typedArray.getInteger(R.styleable.RippleView_rv_alpha, rippleAlpha);
ripplePadding = typedArray.getDimensionPixelSize(R.styleable.RippleView_rv_ripplePadding, 0);
canvasHandler = new Handler();
zoomScale = typedArray.getFloat(R.styleable.RippleView_rv_zoomScale, 1.03f);
zoomDuration = typedArray.getInt(R.styleable.RippleView_rv_zoomDuration, 200);
typedArray.recycle();
paint = new Paint();
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.FILL);
paint.setColor(rippleColor);
paint.setAlpha(rippleAlpha);
this.setWillNotDraw(false);
gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public void onLongPress(MotionEvent event) {
super.onLongPress(event);
animateRipple(event);
sendClickEvent(true);
}
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
return true;
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
this.setDrawingCacheEnabled(true);
this.setClickable(true);
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
if (animationRunning) {
if (rippleDuration <= timer * frameRate) {
animationRunning = false;
timer = 0;
durationEmpty = -1;
timerEmpty = 0;
canvas.restore();
invalidate();
if (onCompletionListener != null) onCompletionListener.onComplete(this);
return;
} else
canvasHandler.postDelayed(runnable, frameRate);
if (timer == 0)
canvas.save();
canvas.drawCircle(x, y, (radiusMax * (((float) timer * frameRate) / rippleDuration)), paint);
paint.setColor(Color.parseColor("#ffff4444"));
if (rippleType == 1 && originBitmap != null && (((float) timer * frameRate) / rippleDuration) > 0.4f) {
if (durationEmpty == -1)
durationEmpty = rippleDuration - timer * frameRate;
timerEmpty++;
final Bitmap tmpBitmap = getCircleBitmap((int) ((radiusMax) * (((float) timerEmpty * frameRate) / (durationEmpty))));
canvas.drawBitmap(tmpBitmap, 0, 0, paint);
tmpBitmap.recycle();
}
paint.setColor(rippleColor);
if (rippleType == 1) {
if ((((float) timer * frameRate) / rippleDuration) > 0.6f)
paint.setAlpha((int) (rippleAlpha - ((rippleAlpha) * (((float) timerEmpty * frameRate) / (durationEmpty)))));
else
paint.setAlpha(rippleAlpha);
}
else
paint.setAlpha((int) (rippleAlpha - ((rippleAlpha) * (((float) timer * frameRate) / rippleDuration))));
timer++;
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
WIDTH = w;
HEIGHT = h;
scaleAnimation = new ScaleAnimation(1.0f, zoomScale, 1.0f, zoomScale, w / 2, h / 2);
scaleAnimation.setDuration(zoomDuration);
scaleAnimation.setRepeatMode(Animation.REVERSE);
scaleAnimation.setRepeatCount(1);
}
/**
* Launch Ripple animation for the current view with a MotionEvent
*
* @param event MotionEvent registered by the Ripple gesture listener
*/
public void animateRipple(MotionEvent event) {
createAnimation(event.getX(), event.getY());
}
/**
* Launch Ripple animation for the current view centered at x and y position
*
* @param x Horizontal position of the ripple center
* @param y Vertical position of the ripple center
*/
public void animateRipple(final float x, final float y) {
createAnimation(x, y);
}
/**
* Create Ripple animation centered at x, y
*
* @param x Horizontal position of the ripple center
* @param y Vertical position of the ripple center
*/
private void createAnimation(final float x, final float y) {
if (this.isEnabled() && !animationRunning) {
if (hasToZoom)
this.startAnimation(scaleAnimation);
radiusMax = Math.max(WIDTH, HEIGHT);
if (rippleType != 2)
radiusMax /= 2;
radiusMax -= ripplePadding;
if (isCentered || rippleType == 1) {
this.x = getMeasuredWidth() / 2;
this.y = getMeasuredHeight() / 2;
} else {
this.x = x;
this.y = y;
}
animationRunning = true;
if (rippleType == 1 && originBitmap == null)
originBitmap = getDrawingCache(true);
invalidate();
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) {
animateRipple(event);
sendClickEvent(false);
}
return super.onTouchEvent(event);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
this.onTouchEvent(event);
return super.onInterceptTouchEvent(event);
}
/**
* Send a click event if parent view is a Listview instance
*
* @param isLongClick Is the event a long click ?
*/
private void sendClickEvent(final Boolean isLongClick) {
if (getParent() instanceof AdapterView) {
final AdapterView adapterView = (AdapterView) getParent();
final int position = adapterView.getPositionForView(this);
final long id = adapterView.getItemIdAtPosition(position);
if (isLongClick) {
if (adapterView.getOnItemLongClickListener() != null)
adapterView.getOnItemLongClickListener().onItemLongClick(adapterView, this, position, id);
} else {
if (adapterView.getOnItemClickListener() != null)
adapterView.getOnItemClickListener().onItemClick(adapterView, this, position, id);
}
}
}
private Bitmap getCircleBitmap(final int radius) {
final Bitmap output = Bitmap.createBitmap(originBitmap.getWidth(), originBitmap.getHeight(), Bitmap.Config.ARGB_8888);
final Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect((int)(x - radius), (int)(y - radius), (int)(x + radius), (int)(y + radius));
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawCircle(x, y, radius, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(originBitmap, rect, rect, paint);
return output;
}
/**
* Set Ripple color, default is #FFFFFF
*
* @param rippleColor New color resource
*/
@ColorRes
public void setRippleColor(int rippleColor) {
this.rippleColor = getResources().getColor(rippleColor);
}
public int getRippleColor() {
return rippleColor;
}
public RippleType getRippleType()
{
return RippleType.values()[rippleType];
}
/**
* Set Ripple type, default is RippleType.SIMPLE
*
* @param rippleType New Ripple type for next animation
*/
public void setRippleType(final RippleType rippleType)
{
this.rippleType = rippleType.ordinal();
}
public Boolean isCentered()
{
return isCentered;
}
/**
* Set if ripple animation has to be centered in its parent view or not, default is False
*
* @param isCentered
*/
public void setCentered(final Boolean isCentered)
{
this.isCentered = isCentered;
}
public int getRipplePadding()
{
return ripplePadding;
}
/**
* Set Ripple padding if you want to avoid some graphic glitch
*
* @param ripplePadding New Ripple padding in pixel, default is 0px
*/
public void setRipplePadding(int ripplePadding)
{
this.ripplePadding = ripplePadding;
}
public Boolean isZooming()
{
return hasToZoom;
}
/**
* At the end of Ripple effect, the child views has to zoom
*
* @param hasToZoom Do the child views have to zoom ? default is False
*/
public void setZooming(Boolean hasToZoom)
{
this.hasToZoom = hasToZoom;
}
public float getZoomScale()
{
return zoomScale;
}
/**
* Scale of the end animation
*
* @param zoomScale Value of scale animation, default is 1.03f
*/
public void setZoomScale(float zoomScale)
{
this.zoomScale = zoomScale;
}
public int getZoomDuration()
{
return zoomDuration;
}
/**
* Duration of the ending animation in ms
*
* @param zoomDuration Duration, default is 200ms
*/
public void setZoomDuration(int zoomDuration)
{
this.zoomDuration = zoomDuration;
}
public int getRippleDuration()
{
return rippleDuration;
}
/**
* Duration of the Ripple animation in ms
*
* @param rippleDuration Duration, default is 400ms
*/
public void setRippleDuration(int rippleDuration)
{
this.rippleDuration = rippleDuration;
}
public int getFrameRate()
{
return frameRate;
}
/**
* Set framerate for Ripple animation
*
* @param frameRate New framerate value, default is 10
*/
public void setFrameRate(int frameRate)
{
this.frameRate = frameRate;
}
public int getRippleAlpha()
{
return rippleAlpha;
}
/**
* Set alpha for ripple effect color
*
* @param rippleAlpha Alpha value between 0 and 255, default is 90
*/
public void setRippleAlpha(int rippleAlpha)
{
this.rippleAlpha = rippleAlpha;
}
public void setOnRippleCompleteListener(OnRippleCompleteListener listener) {
this.onCompletionListener = listener;
}
/**
* Defines a callback called at the end of the Ripple effect
*/
public interface OnRippleCompleteListener {
void onComplete(RippleView rippleView);
}
public enum RippleType {
SIMPLE(0),
DOUBLE(1),
RECTANGLE(2);
int type;
RippleType(int type)
{
this.type = type;
}
}
}
2.自定义属性