Android 购物车加减功能的实现代码

android 实现购物车加减功能，效果图如下所示：

public class adderview extends linearlayout implements view.onclicklistener, textwatcher {
 private int amount = 0; //购买数量
 private int goods_storage = integer.max_value; //商品库存
 private onamountchangelistener mlistener;
 private edittext etamount;
 private button btndecrease;
 private button btnincrease;
 public adderview(context context) {
  this(context, null);
 }
 public adderview(context context, attributeset attrs) {
  super(context, attrs);
  layoutinflater.from(context).inflate(r.layout.number_adder, this);
  etamount = (edittext) findviewbyid(r.id.etamount);
  btndecrease = (button) findviewbyid(r.id.btndecrease);
  btnincrease = (button) findviewbyid(r.id.btnincrease);
  btndecrease.setonclicklistener(this);
  btnincrease.setonclicklistener(this);
  etamount.addtextchangedlistener(this);
  typedarray obtainstyledattributes = getcontext().obtainstyledattributes(attrs, r.styleable.amountview);
  int btnwidth = obtainstyledattributes.getdimensionpixelsize(r.styleable.amountview_btnwidth, 100);
  int tvwidth = obtainstyledattributes.getdimensionpixelsize(r.styleable.amountview_tvwidth, 200);
  int tvtextsize = obtainstyledattributes.getdimensionpixelsize(r.styleable.amountview_tvtextsize, 0);
  int btntextsize = obtainstyledattributes.getdimensionpixelsize(r.styleable.amountview_btntextsize, 0);
  obtainstyledattributes.recycle();
  layoutparams btnparams = new layoutparams(btnwidth, layoutparams.match_parent);
  btndecrease.setlayoutparams(btnparams);
  btnincrease.setlayoutparams(btnparams);
  if (btntextsize != 0) {
   btndecrease.settextsize(typedvalue.complex_unit_px, btntextsize);
   btnincrease.settextsize(typedvalue.complex_unit_px, btntextsize);
  }
  layoutparams textparams = new layoutparams(tvwidth, layoutparams.match_parent);
  etamount.setlayoutparams(textparams);
  if (tvtextsize != 0) {
   etamount.settextsize(tvtextsize);
  }
 }
 public void setonamountchangelistener(onamountchangelistener onamountchangelistener) {
  this.mlistener = onamountchangelistener;
 }
 public void setgoods_storage(int goods_storage) {
  this.goods_storage = goods_storage;
 }
 public void settextcount(int count){
  this.amount = count;
  this.etamount.settext(amount+"");
 }
 @override
 public void onclick(view v) {
  int i = v.getid();
  if (i == r.id.btndecrease) {
   if (amount > 0) {
    amount--;
    etamount.settext(amount + "");
   }
  } else if (i == r.id.btnincrease) {
   if (amount < goods_storage) {
    amount++;
    etamount.settext(amount + "");
   }
  }
  etamount.clearfocus();
  if (mlistener != null) {
   mlistener.onamountchange(this, amount);
  }
 }
 @override
 public void beforetextchanged(charsequence s, int start, int count, int after) {
 }
 @override
 public void ontextchanged(charsequence s, int start, int before, int count) {
 }
 @override
 public void aftertextchanged(editable s) {
  if (s.tostring().isempty())
   return;
  amount = integer.valueof(s.tostring());
  if (amount > goods_storage) {
   etamount.settext(goods_storage + "");
   return;
  }
  if (amount == 0){
//   btndecrease.setbackgroundresource(r.drawable.jian);
  }
  if (amount > 0){
//   btndecrease.setbackgroundresource(r.drawable.lvjian);
  }
  if (mlistener != null) {
   mlistener.onamountchange(this, amount);
  }
 }
 public interface onamountchangelistener {
  void onamountchange(view view, int amount);
 }

<?xml version="1.0" encoding="utf-8"?>
<com.zhy.autolayout.autolinearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="90px"
 android:focusable="true"
 android:divider="@drawable/divder"
 android:background="@drawable/bg_amout_layout"
 android:showdividers="middle"
 android:orientation="horizontal">
 <button
  android:id="@+id/btndecrease"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  android:gravity="center"
  android:background="@drawable/jian"/>
 <edittext
  android:id="@+id/etamount"
  android:layout_width="200px"
  android:layout_height="match_parent"
  android:minwidth="150px"
  android:layout_weight="2"
  android:background="@null"
  android:inputtype="number"
  android:textsize="13sp"
  android:text="0"
  android:gravity="center"/>
 <button
  android:id="@+id/btnincrease"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  android:gravity="center"
  android:background="@drawable/jia"/>
</com.zhy.autolayout.autolinearlayout>

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