Android 购物车加减功能的实现代码
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2022-06-09 08:28:43
android 实现购物车加减功能,效果图如下所示:public class adderview extends linearlayout implements view.onclicklistene...
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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