移动开发之简单购物车实例开发

//自定义控件中的加减号

public class CustomView extends LinearLayout {

private EditText editText;

private Button revserse;

private Button add;

private int mCount = 1 ;

public CustomView(Context context) {

super(context);

}

public CustomView(Context context, @Nullable AttributeSet attrs) {

super(context, attrs);

View view = LayoutInflater.from(context).inflate(R.layout.customview,null,false);

revserse = (Button) view.findViewById(R.id.revserse);

add = (Button) view.findViewById(R.id.add);

editText = (EditText) view.findViewById(R.id.content);

revserse.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View view) {

//减号

try {

String content = editText.getText().toString().trim() ;

int count = Integer.valueOf(content)-1;

mCount = count;

if(count > 1){

editText.setText(count+"");

}

if(listener != null){

listener.click(count);

}

} catch (NumberFormatException e) {

e.printStackTrace();

}

}

});

add.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View view) {

//加号

try {

String content = editText.getText().toString().trim() ;

int count = Integer.valueOf(content)+1;

mCount = count;

editText.setText(count+"");

if(listener != null){

listener.click(count);

}

} catch (NumberFormatException e) {

e.printStackTrace();

}

}

});

addView(view);

}

public int getCurrentCount(){

return mCount ;

}

public CustomView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

}

public ClickListener listener;

public void setListener(ClickListener listener){

this.listener = listener;

}

/**

* 加减号 点击事件

*/

public interface ClickListener {

public void click(int count);

}

}

//activity

public class ShopActivity extends Activity {

@BindView(R.id.third_recyclerview)

RecyclerView thirdRecyclerview;

@BindView(R.id.third_allselect)

TextView thirdAllselect;

@BindView(R.id.third_totalprice)

TextView thirdTotalprice;

@BindView(R.id.third_totalnum)

TextView thirdTotalnum;

@BindView(R.id.third_submit)

TextView thirdSubmit;

@BindView(R.id.third_pay_linear)

LinearLayout thirdPayLinear;

private List mAllOrderList = new ArrayList<>();

private ShopAdapter adapter;

private LinearLayoutManager manager;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_shop);

ButterKnife.bind(this);

getData();

// 1 为选中 2 选中

thirdAllselect.setTag(1);

manager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);

adapter = new ShopAdapter(this);

thirdRecyclerview.setLayoutManager(manager);

thirdRecyclerview.setAdapter(adapter);

adapter.add(mAllOrderList);

adapter.setCheckBoxListener(new ShopAdapter.CheckBoxListener() {

@Override

public void check(int position, int count, boolean check,List list) {

sum(list);

}

});

adapter.setCustomViewListener(new ShopAdapter.CustomViewListener() {

@Override

public void click(int count,List list) {

sum(list);

}

});

adapter.setDelListener(new ShopAdapter.DelListener() {

@Override

public void del(int position,List list) {

sum(list);

}

});

}

float price = 0;

int count;

/**

* 计算总价

* @param mAllOrderList

*/

private void sum(List mAllOrderList) {

price = 0;

count = 0;

boolean allCheck = true ;

for (ShopBean.OrderDataBean.CartlistBean bean : mAllOrderList) {

if (bean.isCheck()) {

//得到总价

price += bean.getPrice() * bean.getCount();

//得到商品个数

count += bean.getCount();

}else {

// 只要有一个商品未选中，全选按钮 应该设置成 为选中

allCheck = false;

}

}

thirdTotalprice.setText("总价: " + price);

thirdTotalnum.setText("共" + count + "件商品");

if(allCheck){

thirdAllselect.setTag(2);

thirdAllselect.setBackgroundResource(R.drawable.shopcart_selected);

}else {

thirdAllselect.setTag(1);

thirdAllselect.setBackgroundResource(R.drawable.shopcart_unselected);

}

}

public void getData() {

try {

//模拟网络请求

InputStream inputStream = getAssets().open("shop.json");

String data = convertStreamToString(inputStream);

Gson gson = new Gson();

ShopBean shopBean = gson.fromJson(data, ShopBean.class);

for (int i = 0; i < shopBean.getOrderData().size(); i++) {

int length = shopBean.getOrderData().get(i).getCartlist().size();

for (int j = 0; j < length; j++) {

mAllOrderList.add(shopBean.getOrderData().get(i).getCartlist().get(j));

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

public static String convertStreamToString(InputStream is) {

/*

* To convert the InputStream to String we use the BufferedReader.readLine()

* method. We iterate until the BufferedReader return null which means

* there's no more data to read. Each line will appended to a StringBuilder

* and returned as String.

*/

BufferedReader reader = new BufferedReader(new InputStreamReader(is));

StringBuilder sb = new StringBuilder();

String line = null;

try {

while ((line = reader.readLine()) != null) {

sb.append(line);

}

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

is.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return sb.toString();

}

boolean select = false ;

@OnClick(R.id.third_allselect)

public void onClick() {

//全选按钮 点击事件

int tag = (Integer) thirdAllselect.getTag() ;

if(tag ==1){

thirdAllselect.setTag(2);

select = true;

} else {

thirdAllselect.setTag(1);

select = false;

}

for (ShopBean.OrderDataBean.CartlistBean bean : mAllOrderList) {

bean.setCheck(select);

}

adapter.notifyDataSetChanged();

sum(adapter.getList());

}

}

//adapter

public class ShopAdapter extends RecyclerView.Adapter {

private Context context;

private List list ;

public ShopAdapter(Context context) {

this.context = context;

}

/**

* 更新数据

* @param list

*/

public void add(List list){

if(this.list == null){

this.list = new ArrayList<>();

}

this.list.addAll(list);

notifyDataSetChanged();

}

@Override

public ShopAdapter.IViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

View view = View.inflate(context, R.layout.shop_adapter, null);

return new IViewHolder(view);

}

@Override

public void onBindViewHolder(final ShopAdapter.IViewHolder holder, final int position) {

//防止checkbox 滑动 错乱

holder.checkbox.setChecked(list.get(position).isCheck());

holder.danjia.setText(list.get(position).getPrice()+"");

ImageLoader.getInstance().displayImage(list.get(position).getDefaultPic(),holder.shopface);

/**

* checkbox 点击事件

*/

holder.checkbox.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

list.get(position).setCheck(holder.checkbox.isChecked());

notifyDataSetChanged();

if(checkBoxListener != null){

checkBoxListener.check(position,holder.customviewid.getCurrentCount(),holder.checkbox.isChecked(),list);

}

}

});

/**

* 加减监听

*/

holder.customviewid.setListener(new CustomView.ClickListener() {

@Override

public void click(int count) {

//更新数据源

list.get(position).setCount(count);

notifyDataSetChanged();

if(listener != null){

listener.click(count,list);

}

}

});

/**

* 删除点击事件

*/

holder.del.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

list.remove(position);

notifyDataSetChanged();

if(delListener != null){

delListener.del(position,list);

}

}

});

}

@Override

public int getItemCount() {

return list == null ? 0 : list.size();

}

static class IViewHolder extends RecyclerView.ViewHolder {

@BindView(R.id.checkbox)

CheckBox checkbox;

@BindView(R.id.shopface)

ImageView shopface;

@BindView(R.id.danjia)

TextView danjia;

@BindView(R.id.customviewid)

CustomView customviewid;

@BindView(R.id.shop_btn_del)

Button del ;

IViewHolder(View view) {

super(view);

ButterKnife.bind(this, view);

}

}

public List getList(){

return list;

}

CheckBoxListener checkBoxListener;

/**

* checkbox 点击事件

* @param listener

*/

public void setCheckBoxListener(CheckBoxListener listener){

this.checkBoxListener = listener;

}

interface CheckBoxListener {

public void check(int position,int count, boolean check,List list);

}

CustomViewListener listener;

/**

* 加减号 点击事件

* @param listener

*/

public void setCustomViewListener(CustomViewListener listener){

this.listener = listener;

}

interface CustomViewListener {

public void click(int count,List list);

}

DelListener delListener ;

/**

* 加减号 删除按钮事件

* @param listener

*/

public void setDelListener(DelListener listener) {

this.delListener = listener ;

}

interface DelListener {

public void del(int position,List list);

}

}