Android-----CheckBox复选使用（实现简单选餐）

  1 <?xml version="1.0" encoding="utf-8"?>
  2 <LinearLayout
  3     xmlns:android="http://schemas.android.com/apk/res/android"
  4     xmlns:tools="http://schemas.android.com/tools"
  5     android:layout_width="match_parent"
  6     android:layout_height="match_parent"
  7     android:orientation="vertical"
  8     tools:context="com.hs.example.exampleapplication.CheckBoxMain">
  9 
 10     <LinearLayout
 11         android:layout_width="match_parent"
 12         android:layout_height="wrap_content"
 13         android:gravity="center"
 14         android:orientation="horizontal">
 15 
 16         <CheckBox
 17             android:id="@+id/chk1"
 18             android:layout_width="0dp"
 19             android:layout_weight="1"
 20             android:layout_height="wrap_content"
 21             android:text="汉堡"/>
 22 
 23         <CheckBox
 24             android:id="@+id/chk2"
 25             android:layout_width="0dp"
 26             android:layout_weight="1"
 27             android:layout_height="wrap_content"
 28             android:text="薯条"/>
 29 
 30         <CheckBox
 31             android:id="@+id/chk3"
 32             android:layout_width="0dp"
 33             android:layout_weight="1"
 34             android:layout_height="wrap_content"
 35             android:text="鸡翅"/>
 36 
 37     </LinearLayout>
 38 
 39     <LinearLayout
 40         android:layout_width="match_parent"
 41         android:layout_height="wrap_content"
 42         android:gravity="center"
 43         android:orientation="horizontal">
 44 
 45         <CheckBox
 46             android:id="@+id/chk4"
 47             android:layout_width="0dp"
 48             android:layout_weight="1"
 49             android:layout_height="wrap_content"
 50             android:text="炸鸡"/>
 51 
 52         <CheckBox
 53             android:id="@+id/chk5"
 54             android:layout_width="0dp"
 55             android:layout_weight="1"
 56             android:layout_height="wrap_content"
 57             android:text="蛋挞"/>
 58 
 59         <CheckBox
 60             android:id="@+id/chk6"
 61             android:layout_width="0dp"
 62             android:layout_weight="1"
 63             android:layout_height="wrap_content"
 64             android:text="鸡块"/>
 65 
 66     </LinearLayout>
 67 
 68     <LinearLayout
 69         android:layout_width="match_parent"
 70         android:layout_height="wrap_content"
 71         android:gravity="center"
 72         android:orientation="horizontal">
 73 
 74         <CheckBox
 75             android:id="@+id/chk7"
 76             android:layout_width="0dp"
 77             android:layout_weight="1"
 78             android:layout_height="wrap_content"
 79             android:text="可乐"/>
 80 
 81         <CheckBox
 82             android:id="@+id/chk8"
 83             android:layout_width="0dp"
 84             android:layout_weight="1"
 85             android:layout_height="wrap_content"
 86             android:text="奶茶"/>
 87 
 88         <CheckBox
 89             android:id="@+id/chk9"
 90             android:layout_width="0dp"
 91             android:layout_weight="1"
 92             android:layout_height="wrap_content"
 93             android:text="咖啡"/>
 94 
 95     </LinearLayout>
 96 
 97     <Button
 98         android:id="@+id/btn_buy"
 99         android:layout_width="match_parent"
100         android:layout_height="wrap_content"
101         android:textSize="30sp"
102         android:text="你的选餐如下："/>
103 
104     <ScrollView
105         android:layout_width="match_parent"
106         android:layout_height="wrap_content">
107 
108         <TextView
109             android:id="@+id/food"
110             android:layout_width="match_parent"
111             android:layout_height="wrap_content" />
112 
113     </ScrollView>
114 
115 </LinearLayout>

 1 public class CheckBoxMain extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener{
 2 
 3     ArrayList<CompoundButton> selected = new ArrayList<>();//用来存储已选取项的集合对象
 4 
 5     @Override
 6     protected void onCreate(Bundle savedInstanceState) {
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.activity_checkbox_main);
 9 
10         /**【所有复选框id数组】**/
11         int chk_id [] = {R.id.chk1 ,R.id.chk2 ,R.id.chk3, R.id.chk4,
12                 R.id.chk5 , R.id.chk6 , R.id.chk7 , R.id.chk8 , R.id.chk9};
13 
14         /**【循环为所有复选框注册监听事件】**/
15         for(int id : chk_id){
16             CheckBox chk = findViewById(id);
17             chk.setOnCheckedChangeListener(this);
18         }
19     }
20 
21     @Override
22     public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
23         if(isChecked){                      //选项被选取
24             selected.add(compoundButton);   //添加到集合中
25         }else {                             //选项被取消
26             selected.remove(compoundButton);//从集合中取消
27         }
28 
29         String msg = "";
30         for(CompoundButton chk : selected){
31             msg += chk.getText()+"\t\t\t"+"    x  1 "+"\n";
32         }
33 
34         if(msg.length()== 0){
35             msg = "请点餐！";
36         }
37 
38         TextView food = this.findViewById(R.id.food);
39         food.setTextSize(25);
40         food.setText(msg);
41 
42     }
43 
44 }