Android RadioGroup和RadioButton控件简单用法示例

2019-12-12 06:05:49

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本文实例讲述了Android RadioGroup和RadioButton控件简单用法。分享给大家供大家参考，具体如下：

RadioGroup和RadioButton代表的是Android中单选按钮的一种控件，写个简单的代码熟悉一下：

import android.app.Activity;import android.os.Bundle;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.RadioGroup.OnCheckedChangeListener;import android.widget.TextView;public class Radio extends Activity {  private TextView myTextView;  private RadioButton chinaBtn;  private RadioButton ukBtn;  private RadioButton usaBtn;  private RadioGroup rg;  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    //通过ID找到TextView    myTextView = (TextView) findViewById(R.id.myTextView);    //通过ID找到RadioButton    chinaBtn = (RadioButton) findViewById(R.id.china_Button);    ukBtn = (RadioButton) findViewById(R.id.uk_Button);    usaBtn = (RadioButton) findViewById(R.id.usa_Button);    //通过ID找到RadioGroup    rg = (RadioGroup) findViewById(R.id.rBtnGroup);    //只要对RadioGroup进行监听    rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {      @Override      public void onCheckedChanged(RadioGroup group, int checkedId) {        // TODO Auto-generated method stub        if(R.id.china_Button == checkedId){          myTextView.setText("您选择的国家是：" + chinaBtn.getText().toString());        }        else if(R.id.uk_Button == checkedId){          myTextView.setText("您选择的国家是：" + ukBtn.getText().toString());        }        else if(R.id.usa_Button == checkedId){          myTextView.setText("您选择的国家是：" + usaBtn.getText().toString());        }      }    });  }}

main.xml文件如下：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  >  <TextView    android:id="@+id/myTextView"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="@string/hello"  />  <RadioGroup android:id="@+id/rBtnGroup"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        >    <RadioButton      android:id="@+id/china_Button"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="中国"    />    <RadioButton      android:id="@+id/uk_Button"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="英国"    />    <RadioButton      android:id="@+id/usa_Button"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="美国"    />  </RadioGroup></LinearLayout>

效果如下：