android

监听RadioGroup、CheckBox状态变化

单选按钮RadioGroup、复选框CheckBox都有OnCheckedChangeListener事件，我们一起了解一下。

一、布局

1、打开“res/layout/activity_main.xml”文件。

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<RelativeLayout   
    xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    tools:context=".MainActivity" >  
  
    <RadioGroup  
        android:id="@+id/gender"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentLeft="true"  
        android:layout_alignParentTop="true" >  
        <RadioButton  
            android:id="@+id/male"  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:checked="true"  
            android:text="男" />  
        <RadioButton  
            android:id="@+id/female"  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:text="女" />  
    </RadioGroup>  
  
    <CheckBox  
        android:id="@+id/football"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentLeft="true"  
        android:layout_below="@+id/gender"  
        android:text="足球" />  
    <CheckBox  
        android:id="@+id/basketball"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentLeft="true"  
        android:layout_below="@+id/football"  
        android:text="蓝球" />  
  
</RelativeLayout>

2、界面如下：

二、OnCheckedChangeListener事件

　　打开“src/com.genwoxue.oncheckedchanged/MainActivity.java”文件。

　　然后输入以下代码：　　

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package com.genwoxue.oncheckedchanged;  
  
import android.os.Bundle;  
import android.app.Activity;  
import android.widget.RadioGroup;  
import android.widget.RadioButton;  
import android.widget.RadioGroup.OnCheckedChangeListener;  //引入OnCheckedChangeListener事件相关包  
import android.widget.CheckBox;  
import android.widget.CompoundButton;  
import android.widget.Toast;  
  
  
public class MainActivity extends Activity {  
    private RadioGroup GenderGroup=null;  
    private RadioButton rbMale=null;  
    private RadioButton rbFemale=null;  
    private CheckBox cbFootBall=null;  
    private CheckBox cbBasketBall=null;  
      
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
        GenderGroup=(RadioGroup)super.findViewById(R.id.gender);  
        rbMale=(RadioButton)super.findViewById(R.id.male);  
        rbFemale=(RadioButton)super.findViewById(R.id.female);  
        cbFootBall=(CheckBox)super.findViewById(R.id.football);  
        cbBasketBall=(CheckBox)super.findViewById(R.id.basketball);  
        //在GenderGroup注册OnCheckedChangeListener事件  
        GenderGroup.setOnCheckedChangeListener(new GenderOnCheckedChangeListener());  
        //在cbFootBall注册OnCheckedChangeListener事件  
        cbFootBall.setOnCheckedChangeListener(new BootBallOnCheckedChangeListener());  
        //在cbBasketBall注册OnCheckedChangeListener事件  
        cbBasketBall.setOnCheckedChangeListener(new BasketBallOnCheckedChangeListener());  
    }  
      
    private class GenderOnCheckedChangeListener implements OnCheckedChangeListener{  
        @Override  
        public void onCheckedChanged(RadioGroup group,int checkedId){  
            String sGender="";  
            if(rbFemale.getId()==checkedId){  
                sGender=rbFemale.getText().toString();  
            }  
            if(rbMale.getId()==checkedId){  
                sGender=rbMale.getText().toString();  
            }  
            Toast.makeText(getApplicationContext(), "您选择的性别是："+sGender, Toast.LENGTH_LONG).show();  
        }  
          
    }  
      
    private class BootBallOnCheckedChangeListener implements CompoundButton.OnCheckedChangeListener{  
        @Override  
        public void onCheckedChanged(CompoundButton button, boolean isChecked){  
            String sFav="";  
            if(isChecked){  
                sFav=cbFootBall.getText().toString();  
                sFav=sFav+"选中！";  
            }else {
                sFav=sFav+"未选中";
            }  
            Toast.makeText(getApplicationContext(), "您选择的爱好是："+sFav, Toast.LENGTH_LONG).show();  
        }  
    }  
      
    private class BasketBallOnCheckedChangeListener implements CompoundButton.OnCheckedChangeListener{  
        @Override  
        public void onCheckedChanged(CompoundButton button,boolean isChecked){  
            String sFav="";  
            if(cbBasketBall.isChecked()){  
                sFav=cbBasketBall.getText().toString();  
                sFav=sFav+"选中！";  
            }else{
                sFav=sFav+"未选中";
            } 
            Toast.makeText(getApplicationContext(), "您选择的爱好是："+sFav, Toast.LENGTH_LONG).show();  
        }  
    }  
      
}

尽管单选按钮和复选框都有OnCheckedChange事件，但注意二者区别。

效果如下：