对于之前最火的无外乎集五福了，而五福除了加十个好友获得外，最直接的途径就是支付宝的咻一咻了。那么咻一咻具体有哪些实现方式呢？下面我们将一一介绍这几种思路的实现过程。
1.自定义view实现咻一咻
那么这种实现方法需要掌握canvas以及paint几乎所有的方法。其对程序员的专业知识要求极高。
用该种方式实现的优点有：
- ㈠这种是最复杂的实现方法，但其兼容性最高，其支持android的所有设备。
- ㈡其对内存要求不大，几乎不占用任何内存。
下面我们来看看是怎样实现其效果的：
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public class xiuyixiuview extends view {
/***
* 中心图片画笔
*/
private paint paint;
/***
* 水波圆圈画笔
*/
private paint circlepaint;
/***
* 用bitmap创建画布
*/
private bitmap bitmap;
/***
* 中心图片
*/
private bitmap imagebit;
/***
* 画布
*/
private canvas canvas;
/***
* 屏幕的宽
*/
private int screenwidth;
/***
* 屏幕的高
*/
private int screenheight;
/***
* 图片右上角坐标
*/
private point pointlefttop;
/***
* 图片右下角坐标
*/
private point pointrightbottom;
/***
* 记录圆圈
*/
private list<lyjcircle> lyjcirclelist;
/***
* 标记是否按下按钮，并且源泉是否扩散消失
*/
private boolean isspread=false;
/***
* 默认没有按动时候的圆圈
*/
private lyjcircle defaultcircle;
public xiuyixiuview(context context, attributeset attrs) {
super(context, attrs);
this.lyjcirclelist=new arraylist<>();
screenwidth=lyjutils.getscreenwidth((activity) context);
screenheight=lyjutils.getscreenheight((activity) context);
bitmap = bitmap.createbitmap(screenwidth, screenheight, bitmap.config.argb_8888); // 设置位图的宽高
canvas = new canvas();
canvas.setbitmap(bitmap);
paint=new paint(paint.dither_flag);
paint.setantialias(true);
circlepaint=new paint(paint.dither_flag);
circlepaint.setantialias(true);
imagebit= bitmapfactory.decoderesource(getresources(), r.drawable.bwa_homepage_yuyin);
pointlefttop=new point((screenwidth/2)-(imagebit.getwidth()/2),(screenheight/2)-(imagebit.getheight()/2));
pointrightbottom=new point(pointlefttop.x+imagebit.getwidth(),pointlefttop.y+imagebit.getheight());
canvas.drawbitmap(imagebit,pointlefttop.x,pointlefttop.y,paint);
//取图片上的颜色
palette.generateasync(imagebit, new palette.paletteasynclistener() {
@override
public void ongenerated(palette palette) {
palette.swatch swatch1 = palette.getvibrantswatch(); //充满活力的色板
circlepaint.setcolor(swatch1.getrgb());
circlepaint.setstyle(paint.style.stroke);
circlepaint.setstrokewidth(10);
circlepaint.setalpha(100);
paint.setshadowlayer(15, 0, 0, swatch1.getrgb());//设置阴影效果
int[] mcolors = new int[] {//渲染颜色
color.transparent,swatch1.getrgb()
};
//范围，这里可以微调，实现你想要的渐变
float[] mpositions = new float[] {
0f, 0.1f
};
shader shader=new radialgradient(screenwidth / 2,screenheight / 2,imagebit.getwidth() / 2 + 10,mcolors, mpositions,
shader.tilemode.mirror);
circlepaint.setshader(shader);
defaultcircle=new lyjcircle(screenwidth / 2, screenheight / 2, imagebit.getwidth() / 2 + 10);
clearscreenanddrawlist();
message message = handler.obtainmessage(1);
handler.sendmessagedelayed(message, 1000); //发送message
}
});
}
@override
public boolean ontouchevent(motionevent event) {
switch (event.getaction()){
case motionevent.action_down:
break;
case motionevent.action_move:
break;
case motionevent.action_up:
isspread=true;//是否按下图片
lyjcirclelist.add(new lyjcircle(screenwidth / 2, screenheight / 2, imagebit.getwidth() / 2 + 10));
clearscreenanddrawlist();
invalidate();
break;
default:
break;
}
return true;
}
private handler handler = new handler(){
public void handlemessage(message msg){
switch (msg.what) {
case 1:
//定时更新界面
clearscreenanddrawlist();
invalidate();
message message = handler.obtainmessage(1);
handler.sendmessagedelayed(message, 200);
}
super.handlemessage(msg);
}
};
/**
* 清掉屏幕上所有的圆圈，然后画出集合里面的圆圈
*/
private void clearscreenanddrawlist() {
canvas.drawcolor(color.transparent, porterduff.mode.clear);
//判断是否按下图片，并且外圈执行完成没有。
if(!isspread){
circlepaint.setmaskfilter(null);
canvas.drawcircle(defaultcircle.getroundx(), defaultcircle.getroundy(),defaultcircle.getradiuloop(), circlepaint);// 画线
}else{
for (lyjcircle lyjcircle : lyjcirclelist) {
if(lyjcircle.getspreadradiu()==0){
}else if(lyjcircle.getspreadradiu()>(lyjcircle.getradiu()+99)){
//如果圆圈扩散半径大于图片半径+99，那么设置边缘模糊，也就是淡出的效果
circlepaint.setmaskfilter(new blurmaskfilter(5, blurmaskfilter.blur.outer));
canvas.drawcircle(lyjcircle.getroundx(), lyjcircle.getroundy(),lyjcircle.getspreadradiu(), circlepaint);// 画线
}else{
//不是则按正常的环形渲染来
circlepaint.setmaskfilter(null);
canvas.drawcircle(lyjcircle.getroundx(), lyjcircle.getroundy(),lyjcircle.getspreadradiu(), circlepaint);// 画线
}
}
}
canvas.drawbitmap(imagebit,pointlefttop.x,pointlefttop.y,paint);
//释放小时了的圆圈
for(int i=0;i<lyjcirclelist.size();i++){
if(lyjcirclelist.get(i).getspreadradiu()==0){
lyjcirclelist.remove(i);
}
}
//如果没有点击图片发射出去的圆圈，那么就恢复默认缩放。
if(lyjcirclelist.size()<=0){
isspread=false;
}
}
@override
protected void ondraw(canvas canvas) {
canvas.drawbitmap(bitmap, 0, 0, null);
}
}
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圆类：
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package com.example.liyuanjing.model;
/**
* created by liyuanjing on 2016/2/3.
*/
public class lyjcircle {
private int roundx;//圆中心点x坐标
private int roundy;//圆中心点y坐标
private int radiu;//圆半径
private int currentradiu;//当前radiu
private int lastradiu;//历史radiu
private int spreadradiu;//加速半径
private int[] speed=new int[]{6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6};//半径扩大速度。这里为匀速
private int speedlast=0;//记录历史值
public lyjcircle(int roundx,int roundy,int radiu){
this.roundx=roundx;
this.roundy=roundy;
this.radiu=radiu;
this.spreadradiu=radiu;
this.currentradiu=this.radiu;
this.lastradiu=this.currentradiu;
}
//获取半径
public int getradiu() {
return radiu;
}
public void setradiu(int radiu) {
this.radiu = radiu;
}
//获取加速半径
public int getspreadradiu(){
if(speedlast>=speed.length){
return 0;
}
spreadradiu+=speed[speedlast];
++speedlast;
return spreadradiu;
}
//获取循环缩放半径
public int getradiuloop() {
if(currentradiu==lastradiu){
++currentradiu;
}else if(currentradiu>lastradiu){
if(currentradiu>(radiu+20)){
currentradiu=19+radiu;
lastradiu=20+radiu;
}else{
lastradiu=currentradiu;
currentradiu+=5;
}
}else{
if(currentradiu<(radiu+9)){
currentradiu=10+radiu;
lastradiu=9+radiu;
}else{
lastradiu=currentradiu;
currentradiu-=5;
}
}
return currentradiu;
}
public int getroundx() {
return roundx;
}
public int getroundy() {
return roundy;
}
}
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你可以修改如下两个地方，会产生视觉上真真的波纹效果：
①支付宝的背景图片是淡红色，衬托了红色的波纹。当然了你也可以将画布设置为透明淡红色。
②其为填充圆圈渲染，不是我的边框渲染效果，你可以将circlepaint.setstyle(paint.style.stroke);换成paint.style.fill.然后，微调shader的mpositions实现环形填充渐变。你也许会觉得，你看支付宝咻一咻圆圈弹开的时候内圈有波纹也像外弹开，其实那就是环形渐变，当你圆圈变大后，其渐变的范围也就变大了，自然你看到有颜色周围扩散的迹象。
2.属性动画实现咻一咻
其要掌握的只是基本只需要属性动画，在加一点线程方面有关的知识而已。
下面我们看看其实现步骤：
㈠自定义view实现一个圆即可,代码如下：
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public class lyjcircleview extends view {
private bitmap bitmap;
private paint paint;
private canvas canvas;
private int screenwidth;
private int screenheight;
private boolean isspreadflag=false;//标记是否发射完成
public boolean isspreadflag() {
return isspreadflag;
}
public void setisspreadflag(boolean isspreadflag) {
this.isspreadflag = isspreadflag;
}
public lyjcircleview(context context,int width,int height,int statusheight) {
super(context);
screenwidth= lyjutils.getscreenwidth((activity) context);
screenheight=lyjutils.getscreenheight((activity) context);
bitmap = bitmap.createbitmap(screenwidth, screenheight, bitmap.config.argb_8888); // 设置位图的宽高
canvas = new canvas();
canvas.setbitmap(bitmap);
paint=new paint(paint.dither_flag);
paint.setantialias(true);
paint.setcolor(color.red);
paint.setstyle(paint.style.stroke);
paint.setstrokewidth(5);
paint.setalpha(100);
paint.setshadowlayer(10, 0, 0, color.red);
int[] mcolors = new int[] {
color.transparent,color.red
};
float[] mpositions = new float[] {
0f, 0.1f
};
shader shader=new radialgradient(screenwidth / 2,screenheight / 2,width / 2 + 10,mcolors, mpositions,
shader.tilemode.mirror);
paint.setshader(shader);
canvas.drawcircle(screenwidth / 2, (screenheight - statusheight) / 2, width / 2 + 10, paint);
invalidate();
}
@override
protected void ondraw(canvas canvas) {
canvas.drawbitmap(bitmap,0,0,null);
}
}
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代码与上面差不多，就不注释了。
㈡实现activity即可
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public class xiuyixiuactivity extends appcompatactivity {
private imagebutton mimagebutton;
private lyjcircleview lyjcircleview;
private relativelayout relativelayout;
private list<lyjcircleview> lyjcircleviewlist;
private int statusbarheight;
private animator anim;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.xiuyixiu_activity_main);
this.mimagebutton=(imagebutton)findviewbyid(r.id.xiuyixiu_imagebutton);
this.relativelayout=(relativelayout)findviewbyid(r.id.xiuyixiu_relativelayout);
this.lyjcircleviewlist=new arraylist<>();
this.mimagebutton.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
lyjcircleview.setvisibility(view.gone);//发射圆圈，即将循环动画view隐藏
final lyjcircleview item=new lyjcircleview(xiuyixiuactivity.this, mimagebutton.getwidth(), mimagebutton.getheight(), statusbarheight);
animator spreadanim = animatorinflater.loadanimator(xiuyixiuactivity.this, r.animator.circle_spread_animator);
spreadanim.addlistener(new animator.animatorlistener() {
@override
public void onanimationstart(animator animation) {
}
@override
public void onanimationend(animator animation) {
item.setisspreadflag(true);//动画执行完成，标记一下
}
@override
public void onanimationcancel(animator animation) {
}
@override
public void onanimationrepeat(animator animation) {
}
});
spreadanim.settarget(item);
spreadanim.start();
lyjcircleviewlist.add(item);
relativelayout.addview(item);
relativelayout.invalidate();
message message = handler.obtainmessage(1);
handler.sendmessagedelayed(message, 10); //发送message,定时释放lyjcircleview
}
});
}
private handler handler = new handler(){
public void handlemessage(message msg){
switch (msg.what) {
case 1:
for(int i=0;i<lyjcircleviewlist.size();i++){
if(lyjcircleviewlist.get(i).isspreadflag()){
relativelayout.removeview(lyjcircleviewlist.get(i));
lyjcircleviewlist.remove(i);
relativelayout.invalidate();
}
}
if(lyjcircleviewlist.size()<=0){
lyjcircleview.setvisibility(view.visible);
}
message message = handler.obtainmessage(1);
handler.sendmessagedelayed(message, 10);
}
super.handlemessage(msg);
}
};
@override
public void onwindowfocuschanged(boolean hasfocus) {
super.onwindowfocuschanged(hasfocus);
//获取状态栏高度
rect frame = new rect();
getwindow().getdecorview().getwindowvisibledisplayframe(frame);
statusbarheight = frame.top;
this.mimagebutton.post(new runnable() {
@override
public void run() {
lyjcircleview = new lyjcircleview(xiuyixiuactivity.this, mimagebutton.getwidth(), mimagebutton.getheight(), statusbarheight);
relativelayout.addview(lyjcircleview);
relativelayout.postinvalidate();
// 加载动画
anim = animatorinflater.loadanimator(xiuyixiuactivity.this, r.animator.circle_scale_animator);
anim.addlistener(new animator.animatorlistener() {
@override
public void onanimationstart(animator animation) {
}
@override
public void onanimationend(animator animation) {
anim.start();//循环执行动画
}
@override
public void onanimationcancel(animator animation) {
}
@override
public void onanimationrepeat(animator animation) {
}
});
anim.settarget(lyjcircleview);
anim.start();
}
});
}
}
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㈢布局文件代码如下：
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<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/xiuyixiu_relativelayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<imagebutton
android:id="@+id/xiuyixiu_imagebutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerinparent="true"
android:background="@drawable/bwa_homepage_yuyin"/>
</relativelayout>
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当然上面两个实现方法，我都只设置圆边框，没有填充，你可以设置为填充后，在微调渐变值。
其属性动画文件circle_scale_animator.xml：
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<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:ordering="together">
<objectanimator
android:duration="1000"
android:propertyname="scalex"
android:valuefrom="1.0"
android:valueto="1.2"
android:valuetype="floattype">
</objectanimator>
<objectanimator
android:duration="1000"
android:propertyname="scaley"
android:valuefrom="1.0"
android:valueto="1.2"
android:valuetype="floattype">
</objectanimator>
<objectanimator
android:startoffset="1000"
android:duration="1000"
android:propertyname="scalex"
android:valuefrom="1.2"
android:valueto="1.0"
android:valuetype="floattype">
</objectanimator>
<objectanimator
android:startoffset="1000"
android:duration="1000"
android:propertyname="scaley"
android:valuefrom="1.2"
android:valueto="1.0"
android:valuetype="floattype">
</objectanimator>
</set>
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另一个circle_spread_animator.xml为：
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<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectanimator
android:duration="1000"
android:propertyname="scaley"
android:valuefrom="1.0"
android:valueto="2.0"
android:valuetype="floattype">
</objectanimator>
<objectanimator
android:duration="1000"
android:propertyname="scalex"
android:valuefrom="1.0"
android:valueto="2.0"
android:valuetype="floattype">
</objectanimator>
</set>
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以上就是本文的详细内容，希望对大家的学习有所帮助。