Android UI设计 RadioGroup单选按钮用法

原文地址:http://www.pocketdigi.com/20100809/18.html

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:

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<RadioGroup android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:checkedButton="@+id/b1" android:id="@+id/RG"> <!--默认选中b1--> <RadioButton android:text="1" android:id="@+id/b1" /> <RadioButton android:text="2" android:id="@+id/b2" /> <RadioButton android:text="3" android:id="@+id/b3" /> </RadioGroup> <Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/show" android:text="RadioGroup测试" /> <Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/clear" android:text="清除" />

程序代码:

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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。

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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(); } } });