第android實(shí)現(xiàn)多點(diǎn)觸摸效果publicMyButton(Contextcontext,@NullableAttributeSetattrs,intdefStyleAttr,intdefStyleRes){

super(context,attrs,defStyleAttr,defStyleRes);

}

//畫(huà)畫(huà)

@Override

protectedvoidonDraw(Canvascanvas){

super.onDraw(canvas);

Paintpaint=newPaint();

paint.setStyle(Paint.Style.STROKE);

for(Circlecircle:circleList){

circle.r+=10;

circle.drawSelf(canvas,paint);

}

}

//觸摸

@Override

publicbooleanonTouchEvent(MotionEventevent){

intaction=event.getAction();

//手指的下標(biāo)Index

intpointIndex=action8;

intaction_code=action0xff;

x=event.getX(pointIndex);//X軸

y=event.getY(pointIndex);//Y軸

indexid=event.getPointerId(pointIndex);//觸摸的下標(biāo)

//Log.i("text","pointIndex="+pointIndex+"action_code="+action_code+"indexid="+indexid);

if(action_code=5){

action_code-=5;

}

switch(action_code){

caseMotionEvent.ACTION_DOWN://點(diǎn)擊

i++;

Circlecircle=newCircle(x,y,0,indexid);//進(jìn)來(lái)一次就NEW一個(gè)對(duì)象

circleList.add(circle);//加入集合

newmy().start();//啟動(dòng)線程

break;

caseMotionEvent.ACTION_UP://移開(kāi)

//circleList.remove(delete(indexid));

break;

caseMotionEvent.ACTION_MOVE://移動(dòng)

/*for(inti=0;ievent.getPointerCount();i++){

intid=event.getPointerId(i);

delete(id).x=event.getX(i);

delete(id).y=event.getY(i);

}*/

break;

}

invalidate();

returntrue;

}

//移除

publicCircledelete(intindexid){

for(Circlecircle:circleList){

if(circle.pointId==indexid){

returncircle;

}

}

returnnull;

}

//線程改變圓大小

@Override

protectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec){

super.onMeasure(widthMeasureSpec,heightMeasureSpec);

}

classmyextendsThread{

@Override

publicvoidrun(){

for(inti=0;ii++){

try{

sleep(110);

postInvalidate();//回調(diào)

}catch(InterruptedExceptione){

e.printStackTrace();

}

if(i==9){