Android之checkbox

package com.cdp.checkbox;
 
import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;
import android.widget.CompoundButton.OnCheckedChangeListener;
 
    //使用状态改变检查监听器
public class MainActivity extends Activity implements OnCheckedChangeListener {
    //创建3个CheckBox对象
    private CheckBox cb1, cb2, cb3;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //实例化3个CheckBox
        cb1 = (CheckBox) findViewById(R.id.cb1);
        cb2 = (CheckBox) findViewById(R.id.cb2);
        cb3 = (CheckBox) findViewById(R.id.cb3);
        cb1.setOnCheckedChangeListener(this);
        cb2.setOnCheckedChangeListener(this);
        cb3.setOnCheckedChangeListener(this);
    }
 
    //重写监听器的抽象函数
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        //buttonView 选中状态发生改变的那个按钮
        //isChecked 表示按钮新的状态（true/false）
        if (cb1 == buttonView || cb2 == buttonView || cb3 == buttonView) {
            if (isChecked) {
                //显示一个提示信息
                toastDisplay(buttonView.getText() + "选中");
 
            } else {
                toastDisplay(buttonView.getText() + "取消选中");
            }
        }
    }
 
    public void toastDisplay(String str) {
        Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
    }
}