Android CheckBox使用

例题2-11

activity_main.xml代码

<?xml version="1.0" encoding="utf-8"?>
<GridLayout android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:columnCount="4"
    android:rowCount="6"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <CheckBox android:id="@+id/c1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_columnSpan="4"
        android:text="唱">
    </CheckBox>
    <CheckBox android:id="@+id/c2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_columnSpan="4"
        android:text="跳">
    </CheckBox>
    <CheckBox android:id="@+id/c3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_columnSpan="4"
        android:text="Rap">
    </CheckBox>
    <CheckBox android:id="@+id/c4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_columnSpan="4"
        android:text="篮球">
    </CheckBox>
    <Button android:id="@+id/but1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="确认"
        android:layout_columnSpan="4"/>
    <TextView android:id="@+id/text1"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="" />
</GridLayout>

Mainactivity.java代码

package com.example.hello;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    Button but1;
    TextView textView;
    CheckBox che1,che2,che3,che4;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView)findViewById(R.id.text1);
        but1 = (Button)findViewById(R.id.but1);
        che1 = (CheckBox)findViewById(R.id.c1);
        che2 = (CheckBox)findViewById(R.id.c2);
        che3 = (CheckBox)findViewById(R.id.c3);
        che4 = (CheckBox)findViewById(R.id.c4);
        but1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String s="";
                if(che1.isChecked())
                    s=s+che1.getText()+" ";
                if(che2.isChecked())
                    s=s+che2.getText()+" ";
                if(che3.isChecked())
                    s=s+che3.getText()+" ";
                if(che4.isChecked())
                    s=s+che4.getText()+" ";
                textView.setText("练习时长两年半的个人练习生“刘秀”的才艺："+s);
            }
        });

    }

}