Android实现购物车及其他功能的角标

1.先来张效果图

2.自定义一个角标工具类bottombarview 。

**
 * created by administrator on 2016/12/27.
 * 角标工具类
 */
public class bottombarview extends relativelayout {
 private context context;
 private textview bar_num;
 private int count = 0;
 public bottombarview(context context) {
 this(context, null);
 }
 public bottombarview(context context, attributeset attrs) {
 this(context, attrs, 0);
 }
 public bottombarview(context context, attributeset attrs, int defstyleattr) {
 super(context, attrs, defstyleattr);
 this.context = context;
 relativelayout rl = (relativelayout) layoutinflater.from(context).inflate(r.layout.bottom_bar_view, this, true);
 bar_num = (textview) rl.findviewbyid(r.id.bar_num);
 bar_num.setvisibility(gone);
 }
 public void add() {
 bar_num.setvisibility(visible);
 count++;
 if (count < 100) {
 bar_num.settext(count + "");
 } else {
 bar_num.settext("99+");
 }
 }
 public void add(int n) throws exception {
 if(n<0){
 throw new exception(bottombarview.class.getsimplename()+" add(int n).the param must be a positive num");
 }
 bar_num.setvisibility(visible);
 count += n;
 if (count < 100) {
 bar_num.settext(count + "");
 } else {
 bar_num.settext("99+");
 }
 }
 public void delete() {
 if (count == 0) {
 bar_num.setvisibility(gone);
 } else {
 count--;
 if (count == 0) {
 bar_num.setvisibility(gone);
 } else if (count > 0 && count < 100) {
 bar_num.setvisibility(visible);
 bar_num.settext(count + "");
 } else {
 bar_num.setvisibility(visible);
 bar_num.settext("99+");
 }
 }
 }
 public void deleteall() {
 count = 0;
 bar_num.setvisibility(gone);
 }
}

3.工具类的一个xml布局。

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 >
 <imageview
 android:id="@+id/imggwc"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centervertical="true"
 android:layout_toleftof="@+id/imggenduo"
android:src="@drawable/chaoshi_shopping_nav_icon" />
 <textview
 android:id="@+id/bar_num"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginleft="-12dp"
 android:layout_torightof="@+id/imggwc"
 android:background="@drawable/red_dot_bg"
 android:text="1"
 android:gravity="center"
 android:textcolor="#ffffff"
 android:textsize="10dp" />
</relativelayout>

4.activity的实现

public static bottombarview fragment_bottom_bar;
fragment_bottom_bar = (bottombarview) findviewbyid(r.id.fragment_bottom_bar);
//购物车数量角标数据
 public static final void gwcsl() {
 map<string, string> map = new hashmap<string, string>();
 map.put(constantutil.token, sputil.get(constantutil.token, ""));
 normalpostrequest npr = new normalpostrequest(myurlutils.getfullurl(baseserverconfig.csgwcsl),
 new response.listener<jsonobject>() {
 @override
 public void onresponse(jsonobject response) {
 try {
 string code = response.getstring("code");
 if (baseserverconfig.code_success.equals(code)) {
 //角标数
 int jiaobiao = integer.parseint(response.getstring("resultcode"));
 try {
  fragment_bottom_bar.deleteall();
  if (jiaobiao > 0) {
  fragment_bottom_bar.add(jiaobiao);
  } else {
  fragment_bottom_bar.deleteall();
  }
 } catch (exception e) {
  e.printstacktrace();
 }
 } else {
 }
 } catch (jsonexception e) {
 }
 }
 }, new response.errorlistener() {
 @override
 public void onerrorresponse(volleyerror error) {
 }
 }, map);
 bzapplication.getrequestqueue().add(npr);
 }

5.activity的xml布局

 <relativelayout
 android:id="@+id/csgwcdj"
 android:layout_width="45dp"
 android:layout_height="match_parent"
 android:layout_toleftof="@+id/relative">
 <com.zjtd.bzcommunity.view.bottombarview
 android:id="@+id/fragment_bottom_bar"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_centervertical="true" />
 </relativelayout>

其实这个小功能很简单，只是你们想得太复杂。。。。。。。

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持！