publicclassConstants{publicstaticString[]province=newString[]{"北京市","天津市","河北省","山西省","内蒙古自治区","辽宁省","吉林省","黑龙江省","上海市","江苏省","浙江省","安徽省","福建省","江西省","山东省","河南省","湖北省","湖南省","广东省","广西壮族自治区","海南省","重庆市","四川省","贵州省","云南省","西藏自治区","陕西省","甘肃省","青海省","宁夏回族自治区","新疆维吾尔自治区","香港","澳门","台湾"};publicstaticString[][]pandc=newString[][]{{"东城区","西城区","崇文区","宣武区","朝阳区","丰台区","石景山区","海淀区","石头沟区","房山区","通州区","顺义区","昌平区","大兴区","怀柔区","平谷区","密云区","延庆区"},{"和平区","河东区","河西区","南开区","河北区","红桥区","塘沽区","汉沽区","大港区","东丽区","西青区","津南区","北辰区","武清区","宝坻区","宁河县","静海县","蓟县"},{"石家庄市","唐山市","秦皇岛市","邯郸市","邢台市","保定市","张家口市","承德市","沧州市","廊坊市","衡水市"},{"太原市","大同市","阳泉市","长治市","晋城市","朔州市","晋中市","运城市","忻州市","临汾市","吕梁市"},{"呼和浩特市","包头市","乌海市","赤峰市","通辽市","鄂尔多斯市","呼伦贝尔市","巴彦淖尔市","乌兰察布市","兴安盟","锡林郭勒市","阿拉善盟"},{"沈阳市","大连市","鞍山市","抚顺市","本溪市","丹东市","锦州市","营口市","阜新市","辽阳市","盘锦市","铁岭市","朝阳市","葫芦岛市"},{"长春市","吉林市","四平市","辽源市","白山市","松原市","白城市","延边州"},{"哈尔滨市","齐齐哈尔市","鸡西市","鹤岗市","双鸭山市","大庆市","伊春市","佳木斯市","七台河市","牡丹江市","黑河市","绥化市","大兴安岭地区"},{"黄浦区","卢湾区","徐汇区","长宁区","静安区","普陀区","闸北区","虹口区","杨浦区","闵行区","宝山区","嘉定区","浦东新区","金山区","松江区","青浦区","南汇区","奉贤区","崇明县"},{"南京市","无锡市","徐州市","常州市","苏州市","南通市","连云港市","淮安市","盐城市","扬州市","镇江市","泰州市","宿迁市"},{"杭州市","宁波市","温州市","嘉兴市","湖州市","绍兴市","金华市","衢州市","舟山市","台州市","丽水市"},{"合肥市","芜湖市","蚌埠市","淮南市","铜陵市","安庆市","黄山市","滁州市","阜阳市","宿州市","巢湖市","六安市","亳州市","池州市","宣城市"},{"福州市","厦门市","莆田市","三明市","泉州市","漳州市","南平市","龙岩市","宁德市"},{"南昌市","景德镇市","萍乡市","九江市","新余市","鹰潭市","赣州市","吉安市","宜春市","抚州市","上饶市"},{"济南市","青岛市","淄博市","枣庄市","东营市","烟台市","廊坊市","济宁市","泰安市","威海市","照市","莱芜市","临沂市","德州市","聊城市","滨州市","菏泽市"},{"郑州市","开封市","洛阳市","平顶山市","安阳市","鹤壁市","新乡市","焦作市","濮阳市","许昌市","漯河市","三峡门市","南阳市","南丘市","信阳市","周口市","驻马店市"},{"武汉市","黄石市","十堰市","宜昌市","襄樊市","鄂州市","荆门市","孝感市","荆州市","黄冈市","咸宁市","随州市","恩施市","仙桃市","潜江市","天门市","神农架林区"},{"长沙市","株洲市","湘潭市","衡阳市","邵阳市","岳阳市","常德市","张家界市","益阳市","郴州市","永州市","怀化市","娄底市","湘西市"},{"广州市","韶关市","深圳市","珠海市","汕头市","佛山市","江门市","湛江市","茂名市","肇庆市","惠州市","梅州市","汕尾市","河源市","阳江市","清远市","东莞市","中山市","潮州市","揭阳市","云浮市"},{"南宁市","柳州市","桂林市","梧州市","北海市","防城港市","钦州市","贵港市","玉林市","百色市","贺州市","河池市","来宾市","崇左市"},{"海口市","三亚市","五指山市","琼海市","儋州市","文昌市","万宁市","东方市","安定县","屯昌县","澄迈县","临高县","白沙县","昌江县","乐东县","陵水县","保亭县","琼中县","西沙群岛","南沙群岛","中沙群岛"},{"万州区","涪陵区","渝中区","大渡口区","江北区","沙坪坝区","九龙坡区","南岸区","北碚区","万盛区","双桥区","渝北区","巴南区","黔江区","长寿区","江津区","合川区","永川区","南川区","綦江县","潼南县","铜梁县","大足县","荣昌县","璧山县","梁平县","城口县","丰都县","垫江县","武隆县","忠县","开县","云阳县","奉节县","巫山县","巫溪县","石柱县","秀山县"},{"成都市","自贡市","攀枝花市","泸州市","德阳市","绵阳市","广元市","遂宁市","内江市","乐山市","南充市","眉山市","宜宾市","广安市","达州市","雅安市","巴中市","资阳市","阿坝州","甘孜州","凉山州"},{"贵阳市","六盘水市","遵义市","安顺市","铜仁地区","黔西南州","毕节地区","黔东南州","黔南州"},{"昆明市","曲靖市","玉溪市","保山市","昭通市","丽江市","普洱市","临沧市","文山州","红河州","西双版纳州","楚雄州","大理州","德宏州","怒江州","迪庆州"},{"拉萨市","昌都地区","山南地区","喀则地区","那曲地区","阿里地区","林芝地区"},{"西安市","铜川市","宝鸡市","咸阳市","渭南市","延安市","汉中市","榆林市","安康市","南洛市"},{"兰州市","嘉峪关市","金昌市","白银市","天水市","武威市","张掖市","平凉市","酒泉市","庆阳市","定西市","陇南市","临夏州","甘南州"},{"西宁市","海东地区","海北州","黄南州","海南州","果洛州","玉树州","海西州"},{"银川市","石嘴山市","吴忠市","固原市","中卫市"},{"乌鲁木齐市","克拉玛依市","吐鲁番地区","哈密地区","昌吉州","博尔塔拉州","巴音郭楞州","阿克苏地区","克孜勒苏州","喀什地区","和田地区","伊犁州","塔城地区","阿勒泰地区","石河子市","阿拉尔市","图木舒克","五家渠市"},{"香港"},{"澳门"},{"台湾"}};}

publicclassMainActivityextendsActivity{PickerViewminute_pv;PickerViewsecond_pv;List<String>province=newArrayList<String>();List<String>province0=newArrayList<String>();ArrayList<ArrayList<String>>cityList=newArrayList<ArrayList<String>>();StringprovinceString="湖南省";StringcityString="张家界市";@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);minute_pv=(PickerView)findViewById(R.id.minute_pv);second_pv=(PickerView)findViewById(R.id.second_pv);Collections.addAll(province,Constants.province);Collections.addAll(province0,Constants.province);for(inti=0;i<Constants.pandc.length;i++){ArrayList<String>list2=newArrayList<String>();for(intj=0;j<Constants.pandc[i].length;j++){list2.add(Constants.pandc[i][j]);}cityList.add(list2);}minute_pv.setData(province0);minute_pv.setOnSelectListener(newonSelectListener(){@OverridepublicvoidonSelect(Stringtext){provinceString=text;for(inti=0;i<province.size();i++){if(text.equals(province.get(i))){second_pv.setData(cityList.get(i));}}}});for(inti=0;i<province.size();i++){if("湖南省".equals(province.get(i))){second_pv.setData(cityList.get(i));}}second_pv.setOnSelectListener(newonSelectListener(){@OverridepublicvoidonSelect(Stringtext){cityString=text;Toast.makeText(MainActivity.this,"选择了"+provinceString+cityString,Toast.LENGTH_SHORT).show();}});}

publicclassPickerViewextendsView{publicstaticfinalStringTAG="PickerView";/***text之间间距和minTextSize之比*/publicstaticfinalfloatMARGIN_ALPHA=2.5f;/***自动回滚到中间的速度*/publicstaticfinalfloatSPEED=2;privateList<String>mDataList;/***选中的位置，这个位置是mDataList的中心位置，一直不变*/privateintmCurrentSelected;privatePaintmPaint;privatefloatmMaxTextSize=50;privatefloatmMinTextSize=40;privatefloatmMaxTextAlpha=255;privatefloatmMinTextAlpha=120;privateintmColorText=0x333333;privateintmViewHeight;privateintmViewWidth;privatefloatmLastDownY;/***滑动的距离*/privatefloatmMoveLen=0;privatebooleanisInit=false;privateonSelectListenermSelectListener;privateTimertimer;privateMyTimerTaskmTask;HandlerupdateHandler=newHandler(){@OverridepublicvoidhandleMessage(Messagemsg){if(Math.abs(mMoveLen)<SPEED){mMoveLen=0;if(mTask!=null){mTask.cancel();mTask=null;performSelect();}}else//这里mMoveLen/Math.abs(mMoveLen)是为了保有mMoveLen的正负号，以实现上滚或下滚mMoveLen=mMoveLen-mMoveLen/Math.abs(mMoveLen)*SPEED;invalidate();}};publicPickerView(Contextcontext){super(context);init();}publicPickerView(Contextcontext,AttributeSetattrs){super(context,attrs);init();}publicvoidsetOnSelectListener(onSelectListenerlistener){mSelectListener=listener;}privatevoidperformSelect(){if(mSelectListener!=null)mSelectListener.onSelect(mDataList.get(mCurrentSelected));}publicvoidsetData(List<String>datas){mDataList=datas;mCurrentSelected=datas.size()/2;invalidate();}publicvoidsetSelected(intselected){mCurrentSelected=selected;}privatevoidmoveHeadToTail(){Stringhead=mDataList.get(0);mDataList.remove(0);mDataList.add(head);}privatevoidmoveTailToHead(){Stringtail=mDataList.get(mDataList.size()-1);mDataList.remove(mDataList.size()-1);mDataList.add(0,tail);}@OverrideprotectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec){super.onMeasure(widthMeasureSpec,heightMeasureSpec);mViewHeight=getMeasuredHeight();mViewWidth=getMeasuredWidth();isInit=true;invalidate();}privatevoidinit(){timer=newTimer();mDataList=newArrayList<String>();mPaint=newPaint(Paint.ANTI_ALIAS_FLAG);mPaint.setStyle(Style.FILL);mPaint.setTextAlign(Align.CENTER);mPaint.setColor(mColorText);}@OverrideprotectedvoidonDraw(Canvascanvas){super.onDraw(canvas);//根据index绘制viewif(isInit)drawData(canvas);}privatevoiddrawData(Canvascanvas){mPaint.setColor(Color.GRAY);//设置画笔颜色mPaint.setStrokeWidth((float)0.7);//设置线宽canvas.drawLine(0,mViewHeight/2-50,mViewWidth,mViewHeight/2-50,mPaint);canvas.drawLine(0,mViewHeight/2+50,mViewWidth,mViewHeight/2+50,mPaint);//先绘制选中的text再往上往下绘制其余的textfloatscale=parabola(mViewHeight/4.0f,mMoveLen);floatsize=(mMaxTextSize-mMinTextSize)*scale+mMinTextSize;mPaint.setTextSize(size);mPaint.setColor(Color.parseColor("#FF7F28"));mPaint.setAlpha((int)((mMaxTextAlpha-mMinTextAlpha)*scale+mMinTextAlpha));//text居中绘制，注意baseline的计算才能达到居中，y值是text中心坐标floatx=(float)(mViewWidth/2.0);floaty=(float)(mViewHeight/2.0+mMoveLen);FontMetricsIntfmi=mPaint.getFontMetricsInt();floatbaseline=(float)(y-(fmi.bottom/2.0+fmi.top/2.0));canvas.drawText(mDataList.get(mCurrentSelected),x,baseline,mPaint);//绘制上方datafor(inti=1;(mCurrentSelected-i)>=0;i++){drawOtherText(canvas,i,-1);}//绘制下方datafor(inti=1;(mCurrentSelected+i)<mDataList.size();i++){drawOtherText(canvas,i,1);}}/***@paramcanvas*@paramposition*距离mCurrentSelected的差值*@paramtype*1表示向下绘制，-1表示向上绘制*/privatevoiddrawOtherText(Canvascanvas,intposition,inttype){floatd=(float)(MARGIN_ALPHA*mMinTextSize*position+type*mMoveLen);floatscale=parabola(mViewHeight/4.0f,d);floatsize=(mMaxTextSize-mMinTextSize)*scale+mMinTextSize;mPaint.setTextSize(size);mPaint.setColor(Color.parseColor("#000000"));mPaint.setAlpha((int)((mMaxTextAlpha-mMinTextAlpha)*scale+mMinTextAlpha));floaty=(float)(mViewHeight/2.0+type*d);FontMetricsIntfmi=mPaint.getFontMetricsInt();floatbaseline=(float)(y-(fmi.bottom/2.0+fmi.top/2.0));canvas.drawText(mDataList.get(mCurrentSelected+type*position),(float)(mViewWidth/2.0),baseline,mPaint);}/***抛物线**@paramzero*零点坐标*@paramx*偏移量*@returnscale*/privatefloatparabola(floatzero,floatx){floatf=(float)(1-Math.pow(x/zero,2));returnf<0?0:f;}@OverridepublicbooleanonTouchEvent(MotionEventevent){switch(event.getActionMasked()){caseMotionEvent.ACTION_DOWN:doDown(event);break;caseMotionEvent.ACTION_MOVE:doMove(event);break;caseMotionEvent.ACTION_UP:doUp(event);break;}returntrue;}privatevoiddoDown(MotionEventevent){if(mTask!=null){mTask.cancel();mTask=null;}mLastDownY=event.getY();}privatevoiddoMove(MotionEventevent){mMoveLen+=(event.getY()-mLastDownY);if(mMoveLen>MARGIN_ALPHA*mMinTextSize/2){//往下滑超过离开距离moveTailToHead();mMoveLen=mMoveLen-MARGIN_ALPHA*mMinTextSize;}elseif(mMoveLen<-MARGIN_ALPHA*mMinTextSize/2){//往上滑超过离开距离moveHeadToTail();mMoveLen=mMoveLen+MARGIN_ALPHA*mMinTextSize;}mLastDownY=event.getY();invalidate();}privatevoiddoUp(MotionEventevent){//抬起手后mCurrentSelected的位置由当前位置move到中间选中位置if(Math.abs(mMoveLen)<0.0001){mMoveLen=0;return;}if(mTask!=null){mTask.cancel();mTask=null;}mTask=newMyTimerTask(updateHandler);timer.schedule(mTask,0,10);}classMyTimerTaskextendsTimerTask{Handlerhandler;publicMyTimerTask(Handlerhandler){this.handler=handler;}@Overridepublicvoidrun(){handler.sendMessage(handler.obtainMessage());}}publicinterfaceonSelectListener{voidonSelect(Stringtext);}}