Android实现购物车及其他功能的角标

**
 * 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);
 }
}

<?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>

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);
 }

 <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>