Android-CheckBox(复选框)

实现CheckBox功能的小例子：点击OK，显示选中的内容

Activity.java

package com.example.widgetdemo;

import androidx.appcompat.app.AppCompatActivity;
import android.view.View.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;


public class CheckBoxActivty extends AppCompatActivity {

    Button btn_sport;
    TextView text_sport;
    CheckBox cb1;
    CheckBox cb2;
    CheckBox cb3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_check_box_activty);
        text_sport = findViewById(R.id.text_sport);
        cb1 = findViewById(R.id.sport1);
        cb2 = findViewById(R.id.sport2);
        cb3 = findViewById(R.id.sport3);
        btn_sport = findViewById(R.id.btn_sport);
        btn_sport.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                String str = "";
                if (cb1.isChecked()) str = str + "\n" + cb1.getText();
                if (cb2.isChecked()) str = str + "\n" + cb2.getText();
                if (cb3.isChecked()) str = str + "\n" + cb3.getText();
                text_sport.setText("chance is:" + str);
            }
        });

    }


    public void onCheckBoxClicked(View view){
        //参数一表示：显示在CheckBoxActivty中
        if (((CheckBox)view).isChecked())
        {
            Toast.makeText(CheckBoxActivty.this,((CheckBox)view).getText(),Toast.LENGTH_LONG).show();
        }
    }
}

xml代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".CheckBoxActivty">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="请选择你喜欢的运动"
        android:textSize="20sp"/>

    <CheckBox
        android:id="@+id/sport1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/sport1"
        android:textSize="20sp"
        android:onClick="onCheckBoxClicked"/>
    <CheckBox
        android:id="@+id/sport2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/sport2"
        android:textSize="20sp"
        android:checked="false"
        android:onClick="onCheckBoxClicked"/>
    <CheckBox
        android:id="@+id/sport3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/sport3"
        android:textSize="20sp"
        android:checked="false"
        android:onClick="onCheckBoxClicked"/>

    <Button
        android:id="@+id/btn_sport"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="OK"
        android:textSize="20sp"/>

    <TextView
        android:id="@+id/text_sport"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="20sp"
        android:text=""/>


</LinearLayout>