一级购物车（自定义view和自定义拦截器interceptor）

快来打我* 2023-10-17 21:59 26阅读 0赞

自定义拦截器interceptor

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1.  **public****class** MyInterceptor **implements** Interceptor \{ 
2.  @Override
3.  **public** Response intercept(Chain chain) **throws** IOException \{ 
4.   Request ysRequest = chain.request(); 
5.   FormBody body = (FormBody) ysRequest.body(); 
6.   FormBody.Builder builder = **new** FormBody.Builder(); 
7.  
8.  **for** (**int** i = 0; i <body.size(); i++) \{ 
9.   String name = body.name(i); 
10.  String value = body.value(i); 
11.  builder.add(name,value); 
12.  \} 
13.  builder.add("uri","evaluation"); 
14.  FormBody formBody = builder.build(); 
15.  Request request = **new** Request.Builder().url(ysRequest.url()).post(formBody).build(); 
16. **return** chain.proceed(request); 
17.  \} 
18. \}

单列模式的网络请求（OkHttp）

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1.  **package** bwie.com.yijicart.net; 
2.  
3.  **import** java.util.Map; 
4.  
5.  **import** okhttp3.Callback; 
6.  **import** okhttp3.FormBody; 
7.  **import** okhttp3.OkHttpClient; 
8.  **import** okhttp3.Request; 
9.  
10. 
11. **public****class** HttpUtils \{ 
12. **private****static** HttpUtils httpUtils; 
13. **private****final** OkHttpClient client; 
14. 
15. **private** HttpUtils() \{ 
16. /\*\*
17.  \* okhttp请求+自定义拦截器
18.  \*/
19.  client = **new** OkHttpClient.Builder().addInterceptor(**new** MyInterceptor()).build(); 
20.  \} 
21. 
22. **public****static** HttpUtils getHttpUtils()\{ 
23. **if**(httpUtils==**null**)\{ 
24. **synchronized** (HttpUtils.**class**)\{ 
25.  httpUtils=**new** HttpUtils(); 
26.  \} 
27.  \} 
28. **return** httpUtils; 
29.  \} 
30. **public****void** doPost(String url, Map<String,String>map, Callback callback)\{ 
31.  FormBody.Builder builder = **new** FormBody.Builder(); 
32. **for** (Map.Entry<String,String> e:map.entrySet()) \{ 
33.  builder.add(e.getKey(),e.getValue()); 
34.  \} 
35.  FormBody formBody = builder.build(); 
36. 
37.  Request request = **new** Request.Builder().url(url).post(formBody).build(); 
38.  client.newCall(request).enqueue(callback); 
39. 
40. 
41.  \} 
42. \}

自定义View的布局（购物车的加减）

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1.  <?xml version="1.0" encoding="utf-8"?> 
2.  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3.   android:orientation="horizontal" android:layout\_width="wrap\_content"
4.   android:layout\_height="wrap\_content"> 
5.   <ImageView 
6.   android:id="@+id/jian"
7.   android:layout\_width="20dp"
8.   android:layout\_height="20dp"
9.   android:src="@drawable/shopcart\_minus\_grey" /> 
10. 
11.  <TextView 
12.  android:id="@+id/tv\_num"
13.  android:layout\_width="wrap\_content"
14.  android:layout\_height="wrap\_content"
15.  android:layout\_marginLeft="5dp"
16.  android:background="@drawable/shopcart\_add\_btn"
17.  android:paddingBottom="2dp"
18.  android:paddingLeft="20dp"
19.  android:paddingRight="20dp"
20.  android:paddingTop="2dp"
21.  android:text="1" /> 
22. 
23.  <ImageView 
24.  android:id="@+id/jia"
25.  android:layout\_width="20dp"
26.  android:layout\_height="20dp"
27.  android:layout\_marginLeft="5dp"
28.  android:src="@drawable/shopcart\_add\_red" /> 
29.  <Button 
30.  android:id="@+id/del"
31.  android:text="删除"
32.  android:layout\_marginLeft="10dp"
33.  android:layout\_width="wrap\_content"
34.  android:layout\_height="wrap\_content" /> 
35. </LinearLayout>

自定义View

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1.  **package** bwie.com.yijicart.view; 
2.  
3.  **import** android.content.Context; 
4.  **import** android.util.AttributeSet; 
5.  **import** android.view.LayoutInflater; 
6.  **import** android.view.View; 
7.  **import** android.widget.Button; 
8.  **import** android.widget.ImageView; 
9.  **import** android.widget.LinearLayout; 
10. **import** android.widget.TextView; 
11. 
12. **import** bwie.com.yijicart.R; 
13. 
14. 
15. **public****class** MyView **extends** LinearLayout \{ 
16. 
17. **private** ImageView jia; 
18. **private** ImageView jian; 
19. **private** TextView tv\_num; 
20. **private** Button del; 
21. 
22. **public** MyView(Context context) \{ 
23. **this**(context,**null**); 
24.  \} 
25. 
26. **public** MyView(Context context, AttributeSet attrs) \{ 
27. **super**(context, attrs); 
28.  View view = LayoutInflater.from(context).inflate(R.layout.zyitem, **this**); 
29.  jia = view.findViewById(R.id.jia); 
30.  jian = view.findViewById(R.id.jian); 
31.  tv\_num = view.findViewById(R.id.tv\_num); 
32.  del = view.findViewById(R.id.del); 
33.  \} 
34. **public****void** addClickListener(OnClickListener onClickListener)\{ 
35.  jia.setOnClickListener(onClickListener); 
36.  \} 
37. **public****void** jianClickListener(OnClickListener onClickListener)\{ 
38.  jian.setOnClickListener(onClickListener); 
39.  \} 
40. **public****void** delClickListener(OnClickListener onClickListener)\{ 
41.  del.setOnClickListener(onClickListener); 
42.  \} 
43. **public****void** setNum(String num) \{ 
44.  tv\_num.setText(num); 
45.  \} 
46. 
47. **public****int** getNum() \{ 
48.  String num = tv\_num.getText().toString(); 
49. **return** Integer.parseInt(num); 
50.  \} 
51. \}

activity—main的布局

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1.  <?xml version="1.0" encoding="utf-8"?> 
2.  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3.   xmlns:tools="http://schemas.android.com/tools"
4.   android:id="@+id/activity\_main"
5.   android:layout\_width="match\_parent"
6.   android:layout\_height="match\_parent"
7.   android:orientation="vertical"
8.   android:paddingBottom="@dimen/activity\_vertical\_margin"
9.   android:paddingLeft="@dimen/activity\_horizontal\_margin"
10.  android:paddingRight="@dimen/activity\_horizontal\_margin"
11.  android:paddingTop="@dimen/activity\_vertical\_margin"
12.  tools:context="bwie.com.yijicart.view.MainActivity"> 
13.  <android.support.v7.widget.RecyclerView 
14.  android:id="@+id/rlv"
15.  android:layout\_weight="1"
16.  android:layout\_width="match\_parent"
17.  android:layout\_height="match\_parent"> 
18. 
19.  </android.support.v7.widget.RecyclerView> 
20.  <LinearLayout 
21.  android:layout\_weight="9"
22.  android:orientation="horizontal"
23.  android:layout\_width="match\_parent"
24.  android:layout\_height="match\_parent"> 
25. 
26.  <CheckBox 
27.  android:id="@+id/quanxuan"
28.  android:layout\_width="wrap\_content"
29.  android:layout\_height="wrap\_content"
30.  /> 
31. 
32.  <TextView 
33.  android:layout\_marginLeft="5dp"
34.  android:text="全选"
35.  android:layout\_width="wrap\_content"
36.  android:layout\_height="wrap\_content" /> 
37.  <TextView 
38.  android:id="@+id/zongji"
39.  android:layout\_marginLeft="80dp"
40.  android:text="合计：0"
41.  android:layout\_width="wrap\_content"
42.  android:layout\_height="wrap\_content" /> 
43.  <TextView 
44.  android:layout\_marginLeft="100dp"
45.  android:id="@+id/heji"
46.  android:text="结算（0）"
47.  android:gravity="center"
48.  android:background="@color/colorAccent"
49.  android:layout\_width="wrap\_content"
50.  android:layout\_height="match\_parent" /> 
51.  </LinearLayout> 
52. </LinearLayout>

MainActivity

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1.  <span style="font-size:14px;">**package** bwie.com.yijicart.view; 
2.  
3.  **import** android.os.Bundle; 
4.  **import** android.support.v7.app.AppCompatActivity; 
5.  **import** android.support.v7.widget.LinearLayoutManager; 
6.  **import** android.support.v7.widget.RecyclerView; 
7.  **import** android.view.View; 
8.  **import** android.widget.CheckBox; 
9.  **import** android.widget.LinearLayout; 
10. **import** android.widget.TextView; 
11. 
12. **import** org.greenrobot.eventbus.EventBus; 
13. **import** org.greenrobot.eventbus.Subscribe; 
14. 
15. **import** java.util.List; 
16. 
17. **import** bwie.com.yijicart.R; 
18. **import** bwie.com.yijicart.adapter.Myadapter; 
19. **import** bwie.com.yijicart.bean.CountPrice; 
20. **import** bwie.com.yijicart.bean.GoodsBean; 
21. **import** bwie.com.yijicart.bean.MessageEvent; 
22. **import** bwie.com.yijicart.persenter.GoodsPersenter; 
23. **import** bwie.com.yijicart.view.IMain.IMain; 
24. 
25. **public****class** MainActivity **extends** AppCompatActivity **implements** IMain, View.OnClickListener \{ 
26. 
27. **private** RecyclerView mRlv; 
28. **private** CheckBox mQuanxuan; 
29. /\*\*
30.  \* 合计：0
31.  \*/
32. **private** TextView mZongji; 
33. /\*\*
34.  \* 结算（0）
35.  \*/
36. **private** TextView mHeji; 
37. **private** LinearLayout mActivityMain; 
38. **private** Myadapter myadapter; 
39. 
40. @Override
41. **protected****void** onCreate(Bundle savedInstanceState) \{ 
42. **super**.onCreate(savedInstanceState); 
43.  setContentView(R.layout.activity\_main); 
44.  EventBus.getDefault().register(**this**); 
45.  initView(); 
46. **new** GoodsPersenter(**this**).getGoods(); 
47. 
48.  \} 
49. 
50. @Override
51. **public****void** showList(List<GoodsBean.DataBean.DatasBean> list) \{ 
52.  mRlv.setLayoutManager(**new** LinearLayoutManager(**this**)); 
53.  myadapter = **new** Myadapter(**this**, list); 
54.  mRlv.setAdapter(myadapter); 
55.  \} 
56. 
57. **private****void** initView() \{ 
58.  mRlv = (RecyclerView) findViewById(R.id.rlv); 
59.  mQuanxuan = (CheckBox) findViewById(R.id.quanxuan); 
60.  mQuanxuan.setOnClickListener(**this**); 
61.  mZongji = (TextView) findViewById(R.id.zongji); 
62.  mHeji = (TextView) findViewById(R.id.heji); 
63.  mActivityMain = (LinearLayout) findViewById(R.id.activity\_main); 
64.  \} 
65. 
66. @Override
67. **public****void** onClick(View v) \{ 
68. **switch** (v.getId()) \{ 
69. **default**: 
70. **break**; 
71. **case** R.id.quanxuan: 
72.  myadapter.UpdateAllCheck(mQuanxuan.isChecked()); 
73. **break**; 
74.  \} 
75.  \} 
76. @Subscribe
77. **public****void** onMessageEvent(MessageEvent event)\{ 
78.  mQuanxuan.setChecked(event.isCheck()); 
79.  \} 
80. @Subscribe
81. **public****void** onMessageEvent(CountPrice cp)\{ 
82.  mZongji.setText("总价："\+cp.getPrice()+"元"); 
83.  mHeji.setText("结算（"\+cp.getCount()+"）"); 
84.  \} 
85. @Override
86. **protected****void** onDestroy() \{ 
87. **super**.onDestroy(); 
88.  EventBus.getDefault().unregister(**this**); 
89.  \} 
90. \}</span>

适配器的布局

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1.  <?xml version="1.0" encoding="utf-8"?> 
2.  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3.   android:orientation="horizontal" android:layout\_width="match\_parent"
4.   android:layout\_marginLeft="20dp"
5.   android:background="\#FFEEE718"
6.   android:layout\_marginTop="15dp"
7.   android:layout\_height="wrap\_content"> 
8.   <CheckBox 
9.   android:id="@+id/gx"
10.  android:layout\_marginLeft="25dp"
11.  android:layout\_width="wrap\_content"
12.  android:layout\_height="wrap\_content" /> 
13.  <LinearLayout 
14.  android:orientation="vertical"
15.  android:layout\_width="wrap\_content"
16.  android:layout\_height="wrap\_content"> 
17.  <TextView 
18.  android:id="@+id/name2"
19.  android:layout\_marginLeft="20dp"
20.  android:layout\_width="wrap\_content"
21.  android:layout\_height="wrap\_content" /> 
22. 
23.  <TextView 
24.  android:id="@+id/time"
25.  android:layout\_marginLeft="20dp"
26.  android:layout\_width="wrap\_content"
27.  android:layout\_height="wrap\_content" /> 
28.  <TextView 
29.  android:id="@+id/price"
30.  android:layout\_marginLeft="20dp"
31.  android:layout\_width="wrap\_content"
32.  android:layout\_height="wrap\_content" /> 
33.  </LinearLayout> 
34. 
35. 
36.  <bwie.com.yijicart.view.MyView 
37.  android:id="@+id/myView"
38.  android:layout\_gravity="center\_vertical"
39.  android:layout\_marginLeft="20dp"
40.  android:layout\_width="wrap\_content"
41.  android:layout\_height="wrap\_content"> 
42. 
43.  </bwie.com.yijicart.view.MyView> 
44. 
45. 
46. 
47. 
48. </LinearLayout>

适配器

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1.  **package** bwie.com.yijicart.adapter; 
2.  
3.  **import** android.content.Context; 
4.  **import** android.support.v7.widget.RecyclerView; 
5.  **import** android.view.LayoutInflater; 
6.  **import** android.view.View; 
7.  **import** android.view.ViewGroup; 
8.  **import** android.widget.CheckBox; 
9.  **import** android.widget.TextView; 
10. 
11. **import** org.greenrobot.eventbus.EventBus; 
12. 
13. **import** java.util.List; 
14. 
15. **import** bwie.com.yijicart.R; 
16. **import** bwie.com.yijicart.bean.CountPrice; 
17. **import** bwie.com.yijicart.bean.GoodsBean; 
18. **import** bwie.com.yijicart.bean.MessageEvent; 
19. **import** bwie.com.yijicart.view.MyView; 
20. 
21. **import****static** bwie.com.yijicart.R.id.price; 
22. 
23. 
24. **public****class** Myadapter **extends** RecyclerView.Adapter<RecyclerView.ViewHolder>\{ 
25. **private** Context context; 
26. **private** List<GoodsBean.DataBean.DatasBean> list; 
27. 
28. **public** Myadapter(Context context, List<GoodsBean.DataBean.DatasBean> list) \{ 
29. **this**.context = context; 
30. **this**.list = list; 
31.  \} 
32. 
33. @Override
34. **public** RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, **int** viewType) \{ 
35.  View view = LayoutInflater.from(context).inflate(R.layout.childitem, parent, **false**); 
36. **return****new** MyViewHodler(view); 
37.  \} 
38. 
39. @Override
40. **public****void** onBindViewHolder(RecyclerView.ViewHolder holder, **final****int** position) \{ 
41. **final** GoodsBean.DataBean.DatasBean datasBean = list.get(position); 
42. **final** MyViewHodler myViewHodler= (MyViewHodler) holder; 
43. 
44.  myViewHodler.gx.setChecked(datasBean.isCheck()); 
45.  myViewHodler.tv\_name.setText(datasBean.getType\_name()); 
46.  myViewHodler.tv\_prc.setText(datasBean.getPrice()+""); 
47.  myViewHodler.tv\_time.setText(datasBean.getAdd\_time()); 
48. 
49.  myViewHodler.myView.setNum(datasBean.getNum()+""); 
50. 
51. //对勾选进行点击事件
52.  myViewHodler.gx.setOnClickListener(**new** View.OnClickListener() \{ 
53. @Override
54. **public****void** onClick(View v) \{ 
55.  datasBean.setCheck(myViewHodler.gx.isChecked()); 
56. //计算勾选状态下的数量和价格
57.  EventBus.getDefault().post(getCountandPrice()); 
58. //通过判断子条目的checkbox是否全部选中，来改变全选的状态
59.  UpdateAllQX(isCheckAll()); 
60.  notifyDataSetChanged(); 
61.  \} 
62.  \}); 
63. /\*\*
64.  \* 加的点击事件
65.  \*/
66.  myViewHodler.myView.addClickListener(**new** View.OnClickListener() \{ 
67. @Override
68. **public****void** onClick(View v) \{ 
69. **int** num = myViewHodler.myView.getNum(); 
70.  \++num; 
71.  datasBean.setNum(num); 
72.  myViewHodler.myView.setNum(num+""); 
73. **if**(myViewHodler.gx.isChecked())\{ 
74.  EventBus.getDefault().post(getCountandPrice()); 
75.  \} 
76. 
77.  notifyDataSetChanged(); 
78.  \} 
79.  \}); 
80. /\*\*\*
81.  \* 减的点击事件
82.  \*/
83.  myViewHodler.myView.jianClickListener(**new** View.OnClickListener() \{ 
84. @Override
85. **public****void** onClick(View v) \{ 
86. **int** num = myViewHodler.myView.getNum(); 
87. **if**(num==0)\{ 
88. **return**; 
89.  \} 
90.  num--; 
91.  datasBean.setNum(num); 
92.  myViewHodler.myView.setNum(num+""); 
93. **if**(myViewHodler.gx.isChecked())\{ 
94.  EventBus.getDefault().post(getCountandPrice()); 
95.  \} 
96. 
97.  notifyDataSetChanged(); 
98.  \} 
99.  \}); 
100. /\*\*
101.  \* 点击删除事假
102.  \*/
103.  myViewHodler.myView.delClickListener(**new** View.OnClickListener() \{ 
104. @Override
105. **public****void** onClick(View v) \{ 
106.  list.remove(position); 
107. **if**(myViewHodler.gx.isChecked())\{ 
108. 
109.  EventBus.getDefault().post(getCountandPrice()); 
110.  \} 
111.  notifyDataSetChanged(); 
112.  \} 
113.  \}); 
114.  \} 
115. 
116. @Override
117. **public****int** getItemCount() \{ 
118. **return** list.size(); 
119.  \} 
120. **class** MyViewHodler **extends** RecyclerView.ViewHolder\{ 
121. 
122. **private****final** CheckBox gx; 
123. **private****final** TextView tv\_time; 
124. **private****final** TextView tv\_prc; 
125. **private****final** TextView tv\_name; 
126. **private****final** MyView myView; 
127. 
128. **public** MyViewHodler(View itemView) \{ 
129. **super**(itemView); 
130.  gx = itemView.findViewById(R.id.gx); 
131.  tv\_time = itemView.findViewById(R.id.time); 
132.  tv\_prc = itemView.findViewById(price); 
133.  tv\_name = itemView.findViewById(R.id.name2); 
134.  myView = itemView.findViewById(R.id.myView); 
135. 
136.  \} 
137.  \} 
138. 
139. /\*\*
140.  \* 判断子条目的checkbox是否全部选中
141.  \* @return
142.  \*/
143. **private****boolean** isCheckAll()\{ 
144. **for** (**int** i = 0; i <list.size(); i++) \{ 
145.  GoodsBean.DataBean.DatasBean datasBean = list.get(i); 
146. **if**(!datasBean.isCheck())\{ 
147. **return****false**; 
148.  \} 
149. 
150.  \} 
151. **return****true**; 
152.  \} 
153. /\*\*
154.  \* 改变全选的状态
155.  \*/
156. **private****void** UpdateAllQX(**boolean** flag)\{ 
157.  MessageEvent messageEvent = **new** MessageEvent(); 
158.  messageEvent.setCheck(flag); 
159.  EventBus.getDefault().post(messageEvent); 
160.  \} 
161. /\*\*
162.  \* 计算勾选状态下的数量和价格
163.  \*/
164. **private** CountPrice getCountandPrice()\{ 
165. **int** count=0; 
166. **int** price=0; 
167. **for** (**int** i = 0; i <list.size(); i++) \{ 
168.  GoodsBean.DataBean.DatasBean datasBean = list.get(i); 
169. **if**(datasBean.isCheck())\{ 
170.  count+=datasBean.getNum(); 
171.  price+=datasBean.getPrice()\*datasBean.getNum(); 
172.  \} 
173. 
174.  \} 
175.  CountPrice countPrice = **new** CountPrice(); 
176.  countPrice.setCount(count); 
177.  countPrice.setPrice(price); 
178. 
179. **return** countPrice; 
180.  \} 
181. /\*\*
182.  \* 全选时改变所有的CheckBox都为选中的状态
183.  \*/
184. **public****void** UpdateAllCheck(**boolean** flag)\{ 
185. **for** (**int** i = 0; i <list.size(); i++) \{ 
186.  GoodsBean.DataBean.DatasBean datasBean = list.get(i); 
187.  datasBean.setCheck(flag); 
188.  \} 
189.  EventBus.getDefault().post(getCountandPrice()); 
190.  notifyDataSetChanged(); 
191.  \} 
192. \}

[view plain]: https://blog.csdn.net/SXS120730/article/details/78596356#