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本文实例为大家分享了android自定义控件实现水波纹的具体代码，供大家参考，具体内容如下
示例代码：
mainactivity.java
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package com.example.mhy.shuibowen;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
public class mainactivity extends appcompatactivity {
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.mhy.shuibowen.mainactivity">
<com.example.mhy.shuibowen.myringwave
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</relativelayout>
myringwave.java
package com.example.mhy.shuibowen;
import android.content.context;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.os.handler;
import android.util.attributeset;
import android.view.motionevent;
import android.view.view;
import java.util.arraylist;
/**
* 水波纹效果
* created by mhy on 2016/6/16.
*/
public class myringwave extends view {
/**
* 二个相临波浪中心点的最小距离
*/
private static final int dis_solp = 13;
protected boolean isrunning = false;
private arraylist<wave> wlist;
public myringwave(context context,attributeset attrs) {
super(context, attrs);
wlist = new arraylist<myringwave.wave>();
}
@override
protected void ondraw(canvas canvas) {
for(int i=0; i<wlist.size(); i++) {
wave wave = wlist.get(i);
canvas.drawcircle(wave.cx, wave.cy, wave.r, wave.p);
}
}
@override
public boolean ontouchevent(motionevent event) {
super.ontouchevent(event);
switch(event.getaction()) {
case motionevent.action_down:
case motionevent.action_move:
int x = (int) event.getx();
int y = (int) event.gety();
addpoint(x, y);
break;
default:
break;
}
return true;
}
private handler handler = new handler(){
public void handlemessage(android.os.message msg) {
//刷新数据
flushdata();
//刷新页面
invalidate();
//循环动画
if (isrunning) {
handler.sendemptymessagedelayed(0, 50);
}
}
};
/**
* 刷新数据
*/
private void flushdata() {
for (int i = 0; i < wlist.size(); i++) {
wave w = wlist.get(i);
//如果透明度为 0 从集合中删除
int alpha = w.p.getalpha();
if(alpha == 0){
wlist.remove(i); //删除i 以后，i的值应该再减1 否则会漏掉一个对象，不过，在此处影响不大，效果上看不出来。
continue;
}
alpha-=5;
if(alpha<5){
alpha =0;
}
//降低透明度
w.p.setalpha(alpha);
//扩大半径
w.r = w.r+3;
//设置半径厚度
w.p.setstrokewidth(w.r/3);
}
/*
* 如果集合被清空，就停止刷新动画
*/
if(wlist.size() == 0){
isrunning = false;
}
}
/**
* 添加新的波浪中心点
* @param x
* @param y
*/
private void addpoint(int x, int y) {
if(wlist.size() == 0) {
addpoint2list(x, y);
isrunning = true;
handler.sendemptymessage(0);
}else{
wave w = wlist.get(wlist.size()-1);
if(math.abs(w.cx - x)>dis_solp || math.abs(w.cy-y)>dis_solp){
addpoint2list(x,y);
}
};
}
/**
* 添加新的波浪
* @param x
* @param y
*/
private void addpoint2list(int x, int y) {
wave w = new wave();
w.cx = x;
w.cy=y;
paint pa=new paint();
pa.setcolor(colors[(int)(math.random()*4)]);
pa.setantialias(true);
pa.setstyle(paint.style.stroke);
w.p = pa;
wlist.add(w);
}
private int [] colors = new int[]{color.blue,color.red,color.yellow,color.green};
private class wave {
//圆心
int cx;
int cy;
//画笔
paint p;
//半径
int r;
}
}
myring.java
package com.example.mhy.shuibowen;
import android.content.context;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.os.handler;
import android.os.message;
import android.util.attributeset;
import android.view.motionevent;
import android.view.view;
/**
* created by mhy on 2016/6/16.
*/
public class myring extends view {
/**
* 圆心的x坐标
*/
private float cx;
/**
* 圆心的y坐标
*/
private float cy;
/**
* 圆环半径
*/
private float radius = 0;
/**
* 默认画笔
*/
private paint paint;
private boolean isruning = false;
public myring(context context, attributeset attrs) {
super(context, attrs);
initview();
}
private void initview() {
radius = 0;
paint = new paint();
paint.setantialias(true);
paint.setstyle(paint.style.stroke); // 空心圆
paint.setstrokewidth(radius / 4); // 画笔宽度 半径4分之一
paint.setcolor(color.green); // 画笔颜色
paint.setalpha(255); //不透明
}
@override
protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
super.onmeasure(widthmeasurespec, heightmeasurespec);
}
@override
protected void onlayout(boolean changed, int l, int t, int r, int b) {
if(changed) {
cx = getwidth() / 2;
cy = getheight() / 2;
}
}
@override
protected void ondraw(canvas canvas) {
canvas.drawcircle(cx, cy, radius, paint);
}
@override
protected void onattachedtowindow() {
super.onattachedtowindow();
}
@override
protected void ondetachedfromwindow() {
super.ondetachedfromwindow();
isruning = false;
}
@override
public boolean ontouchevent(motionevent event) {
super.ontouchevent(event);
if(event.getaction() == motionevent.action_down) {
cx = event.getx();
cy = event.gety();
initview();
startanim();
}
return true;
}
private handler handler = new handler(){
@override
public void handlemessage(message msg) {
// 设置透明度
int alpha = paint.getalpha();
if(alpha == 0) {
isruning = false;
}
// 透明度 慢慢变透明
alpha = math.max(0, alpha-10);
paint.setalpha(alpha);
system.out.println(alpha);
// 设置半径
radius += 5;
paint.setstrokewidth(radius / 3);
invalidate();
if(isruning) {
handler.sendemptymessagedelayed(0, 50);
}
}
};
private void startanim() {
isruning = true;
handler.sendemptymessagedelayed(0, 50);
}
}
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