Android CheckBox使用

例题2-11

activity_main.xml代码

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <GridLayout android:layout_width="fill_parent"
 3     android:layout_height="fill_parent"
 4     android:columnCount="4"
 5     android:rowCount="6"
 6     xmlns:android="http://schemas.android.com/apk/res/android">
 7     <CheckBox android:id="@+id/c1"
 8         android:layout_width="wrap_content"
 9         android:layout_height="wrap_content"
10         android:layout_columnSpan="4"
11         android:text="唱">
12     </CheckBox>
13     <CheckBox android:id="@+id/c2"
14         android:layout_width="wrap_content"
15         android:layout_height="wrap_content"
16         android:layout_columnSpan="4"
17         android:text="跳">
18     </CheckBox>
19     <CheckBox android:id="@+id/c3"
20         android:layout_width="wrap_content"
21         android:layout_height="wrap_content"
22         android:layout_columnSpan="4"
23         android:text="Rap">
24     </CheckBox>
25     <CheckBox android:id="@+id/c4"
26         android:layout_width="wrap_content"
27         android:layout_height="wrap_content"
28         android:layout_columnSpan="4"
29         android:text="篮球">
30     </CheckBox>
31     <Button android:id="@+id/but1"
32         android:layout_width="wrap_content"
33         android:layout_height="wrap_content"
34         android:text="确认"
35         android:layout_columnSpan="4"/>
36     <TextView android:id="@+id/text1"
37         android:layout_height="wrap_content"
38         android:layout_width="wrap_content"
39         android:text="" />
40 </GridLayout>

Mainactivity.java代码

 1 package com.example.hello;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.Button;
 8 import android.widget.CheckBox;
 9 import android.widget.ProgressBar;
10 import android.widget.TextView;
11 
12 public class MainActivity extends AppCompatActivity {
13     Button but1;
14     TextView textView;
15     CheckBox che1,che2,che3,che4;
16     @Override
17     protected void onCreate(Bundle savedInstanceState) {
18         super.onCreate(savedInstanceState);
19         setContentView(R.layout.activity_main);
20         textView = (TextView)findViewById(R.id.text1);
21         but1 = (Button)findViewById(R.id.but1);
22         che1 = (CheckBox)findViewById(R.id.c1);
23         che2 = (CheckBox)findViewById(R.id.c2);
24         che3 = (CheckBox)findViewById(R.id.c3);
25         che4 = (CheckBox)findViewById(R.id.c4);
26         but1.setOnClickListener(new View.OnClickListener() {
27             @Override
28             public void onClick(View v) {
29                 String s="";
30                 if(che1.isChecked())
31                     s=s+che1.getText()+" ";
32                 if(che2.isChecked())
33                     s=s+che2.getText()+" ";
34                 if(che3.isChecked())
35                     s=s+che3.getText()+" ";
36                 if(che4.isChecked())
37                     s=s+che4.getText()+" ";
38                 textView.setText("练习时长两年半的个人练习生“刘秀”的才艺："+s);
39             }
40         });
41 
42     }
43 
44 }