RadioGroup单选按钮用法,还是先看效果图

先中后，点RadioGroup测试按钮，可在标题栏显示选择结果，点清除可以清除选择。

下面上代码，main.xml:

程序代码:

package com.pocketdigi; import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.RadioButton;import android.widget.RadioGroup; public class main extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setTitle("RadioGroup测试");        setContentView(R.layout.main);        RGDemo();    }    RadioGroup rg;    RadioButton b1;    RadioButton b2;    RadioButton b3;    public void RGDemo(){        rg=(RadioGroup)findViewById(R.id.RG);        b1=(RadioButton)findViewById(R.id.b1);        b2=(RadioButton)findViewById(R.id.b2);        b3=(RadioButton)findViewById(R.id.b3);        Button clr=(Button)findViewById(R.id.clear);        clr.setOnClickListener(clear);        Button echo=(Button)findViewById(R.id.show);        echo.setOnClickListener(show);    }    private Button.OnClickListener clear=new OnClickListener(){         @Override        public void onClick(View v) {            // TODO Auto-generated method stub            rg.clearCheck();            setTitle("RadioGroup测试");        }     };    private OnClickListener show=new OnClickListener(){         @Override        public void onClick(View v) {            // TODO Auto-generated method stub            if(b1.isChecked()){                setTitle("1");            }            if(b2.isChecked()){                setTitle("2");            }            if(b3.isChecked()){                setTitle("3");            }        }     };}

RadioGroup有一个onCheckChangeListener监听器,可以通过监听器的onCheckedChanged方法捕捉到点击事件，onCheckedChanged方法会传入一个int型的checkedId,可以通过对比传入的checkedId和RadioButton的ID，来确定被点中的选项.

rg.setOnCheckedChangeListener(new OnCheckedChangeListener(){             @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                // TODO Auto-generated method stub                if(checkedId==b1.getId()){                    Toast.makeText(main.this,"b1选中", Toast.LENGTH_LONG).show();                }                if(checkedId==b2.getId()){                    Toast.makeText(main.this,"b2选中", Toast.LENGTH_LONG).show();                }                if(checkedId==b3.getId()){                    Toast.makeText(main.this,"b3选中", Toast.LENGTH_LONG).show();                }              }         });

出处：