Android自定义控件实现水波纹效果

2023-08-29 12:02:05 76

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

packagecom.example.mhy.shuibowen;

importandroid.support.v7.app.AppCompatActivity;
importandroid.os.Bundle;

publicclassMainActivityextendsAppCompatActivity{

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}

activity_main.xml

MyRingWave.java

packagecom.example.mhy.shuibowen;

importandroid.content.Context;
importandroid.graphics.Canvas;
importandroid.graphics.Color;
importandroid.graphics.Paint;
importandroid.os.Handler;
importandroid.util.AttributeSet;
importandroid.view.MotionEvent;
importandroid.view.View;

importjava.util.ArrayList;

/**
*水波纹效果
*Createdbymhyon2016/6/16.
*/
publicclassMyRingWaveextendsView{
/**
*二个相临波浪中心点的最小距离
*/
privatestaticfinalintDIS_SOLP=13;
protectedbooleanisRunning=false;

privateArrayListwList;

publicMyRingWave(Contextcontext,AttributeSetattrs){
super(context,attrs);
wList=newArrayList();
}

@Override
protectedvoidonDraw(Canvascanvas){
for(inti=0;iDIS_SOLP||Math.abs(w.cy-y)>DIS_SOLP){
addPoint2List(x,y);
}

};
}

/**
*添加新的波浪
*@paramx
*@paramy
*/
privatevoidaddPoint2List(intx,inty){
Wavew=newWave();
w.cx=x;
w.cy=y;
Paintpa=newPaint();
pa.setColor(colors[(int)(Math.random()*4)]);
pa.setAntiAlias(true);
pa.setStyle(Paint.Style.STROKE);

w.p=pa;

wList.add(w);
}

privateint[]colors=newint[]{Color.BLUE,Color.RED,Color.YELLOW,Color.GREEN};
privateclassWave{
//圆心
intcx;
intcy;

//画笔
Paintp;
//半径
intr;
}
}

MyRing.java

packagecom.example.mhy.shuibowen;

importandroid.content.Context;
importandroid.graphics.Canvas;
importandroid.graphics.Color;
importandroid.graphics.Paint;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.util.AttributeSet;
importandroid.view.MotionEvent;
importandroid.view.View;

/**
*Createdbymhyon2016/6/16.
*/
publicclassMyRingextendsView{

/**
*圆心的X坐标
*/
privatefloatcx;

/**
*圆心的Y坐标
*/
privatefloatcy;
/**
*圆环半径
*/
privatefloatradius=0;
/**
*默认画笔
*/
privatePaintpaint;
privatebooleanisRuning=false;

publicMyRing(Contextcontext,AttributeSetattrs){
super(context,attrs);
initView();
}

privatevoidinitView(){
radius=0;
paint=newPaint();
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
protectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec){
super.onMeasure(widthMeasureSpec,heightMeasureSpec);
}

@Override
protectedvoidonLayout(booleanchanged,intl,intt,intr,intb){
if(changed){
cx=getWidth()/2;
cy=getHeight()/2;
}
}

@Override
protectedvoidonDraw(Canvascanvas){
canvas.drawCircle(cx,cy,radius,paint);
}

@Override
protectedvoidonAttachedToWindow(){
super.onAttachedToWindow();
}

@Override
protectedvoidonDetachedFromWindow(){
super.onDetachedFromWindow();
isRuning=false;
}

@Override
publicbooleanonTouchEvent(MotionEventevent){
super.onTouchEvent(event);

if(event.getAction()==MotionEvent.ACTION_DOWN){
cx=event.getX();
cy=event.getY();
initView();
startAnim();
}
returntrue;
}

privateHandlerhandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){

//设置透明度
intalpha=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);
}
}
};
privatevoidstartAnim(){
isRuning=true;
handler.sendEmptyMessageDelayed(0,50);
}

}

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毛票票。

Android自定义控件实现水波纹效果

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