Listvie简单实现购物车功能
本文实例为大家分享了Listvie简单实现购物车的具体代码，供大家参考，具体内容如下
1.自定义view实现加减
publicclassMyViewextendsLinearLayoutimplementsView.OnClickListener{
privateOnAmountChangeListenermListener;
privateintcount;
privateTextViewnumText;
publicMyView(Contextcontext){
this(context,null);
}
publicMyView(Contextcontext,@NullableAttributeSetattrs){
this(context,attrs,0);
}
publicMyView(Contextcontext,@NullableAttributeSetattrs,intdefStyleAttr){
super(context,attrs,defStyleAttr);
Viewview=View.inflate(context,R.layout.add,this);
initView(view);
}
publicvoidsetText(intnum){
numText.setText(""+num);
}
publicintgetText(){
getTextString();
returncount;
}
privatevoidinitView(Viewview){
ButtonaddBtn=view.findViewById(R.id.btn_add);
ButtonjianBtn=view.findViewById(R.id.btn_jian);
numText=view.findViewById(R.id.txt_num);
getTextString();
addBtn.setOnClickListener(this);
jianBtn.setOnClickListener(this);
}
publicvoidsetOnclickNum(OnAmountChangeListenermListener){
this.mListener=mListener;
}
@Override
publicvoidonClick(Viewview){
getTextString();
switch(view.getId()){
caseR.id.btn_add:
count++;
break;
caseR.id.btn_jian:
if(count>0){
count--;
}
break;
}
numText.setText(""+count);
if(mListener!=null){
mListener.onAmountChange(view,count);
}
}
publicvoidgetTextString(){
StringnumStr=numText.getText().toString().trim();
count=Integer.parseInt(numStr);
}
publicinterfaceOnAmountChangeListener{
voidonAmountChange(Viewview,intamount);
}
}
2.适配器接口回调
publicclassMyAdapterextendsBaseAdapter{
privateListmList;
privateContextcontext;
privateGaroupClickgaroupClick;
privateintindex;
privateCountClickcountClick;
publicMyAdapter(Contextcontext){
this.context=context;
}
@Override
publicintgetCount(){
returnmList.size();
}
publicvoidsetData(ListmList){
this.mList=mList;
notifyDataSetChanged();
}
@Override
publicObjectgetItem(inti){
returnmList.get(i);
}
@Override
publiclonggetItemId(inti){
returni;
}
publicvoidsetOnCountClick(CountClickclick){
this.countClick=click;
}
publicvoidsetOnGroupclick(GaroupClickgroupclick){
this.garoupClick=groupclick;
}
@Override
publicViewgetView(finalinti,Viewview,ViewGroupviewGroup){
finalViewHolderholder;
if(view==null){
holder=newViewHolder();
view=View.inflate(context,R.layout.item,null);
holder.childCheck=view.findViewById(R.id.cb_chid_checked);
holder.txtPrice=view.findViewById(R.id.txt_price);
holder.myView=view.findViewById(R.id.myview);
view.setTag(holder);
}else{
holder=(ViewHolder)view.getTag();
}
finalTexttext=mList.get(i);
holder.childCheck.setChecked(text.isChoose());
holder.txtPrice.setText(""+text.getPrice());
holder.myView.setText(text.getCount());
holder.myView.setOnclickNum(newMyView.OnAmountChangeListener(){
@Override
publicvoidonAmountChange(Viewview,intamount){
text.setCount(amount);
}
});
booleanchecked=holder.childCheck.isChecked();
if(checked){
holder.myView.setOnclickNum(newMyView.OnAmountChangeListener(){
@Override
publicvoidonAmountChange(Viewview,intamount){
if(countClick!=null){
countClick.onNumClick(i,amount);
}
}
});
}
holder.childCheck.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewview){
text.setChoose(((CheckBox)view).isChecked());
if(garoupClick!=null){
garoupClick.onItemClick(i,((CheckBox)view).isChecked());
}
}
});
returnview;
}
classViewHolder{
CheckBoxchildCheck;
TextViewtxtPrice;
MyViewmyView;
}
publicinterfaceGaroupClick{
voidonItemClick(intposition,booleanisChoose);
}
publicinterfaceCountClick{
voidonNumClick(intposition,intcount);
}
}
3.调用
publicclassMainActivityextendsAppCompatActivityimplementsMyAdapter.GaroupClick,MyAdapter.CountClick{
privateButtonjiesuanBtn;
privateListViewmListView;
privateCheckBoxallCheck;
privateTextViewpriceText;
privateListmList=newArrayList<>();
privateintnumPrice=0;
privateintcount=0;
privateMyAdapteradapter;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
privatevoidinitData(){
for(inti=0;i<30;i++){
Texttxt=newText();
txt.setPrice(20);
txt.setCount(1);
mList.add(txt);
}
adapter=newMyAdapter(this);
adapter.setData(mList);
mListView.setAdapter(adapter);
adapter.setOnGroupclick(this);
adapter.setOnCountClick(this);
}
publicbooleanisAllChecked(){
for(Texttext:mList){
if(!text.isChoose()){//遍历集合，有一个不选returnfalse
returnfalse;
}
}
returntrue;
}
privatevoidinitView(){
jiesuanBtn=(Button)findViewById(R.id.btn_num);
mListView=(ListView)findViewById(R.id.listview);
allCheck=(CheckBox)findViewById(R.id.cb_all_checked);
priceText=(TextView)findViewById(R.id.txt_price_sum);
allCheck.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewview){
if(mList.size()!=0){
if(allCheck.isChecked()){
for(inti=0;i
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。