单选按钮事件

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activity_main.xml

<LinearLayout 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"     android:orientation="vertical">    <TextView        android:id="@+id/xz"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/sex" />    <!--单选按钮RadioButton 必须放到RadioGroup中-->    <RadioGroup        android:id="@+id/sex"        android:layout_width="wrap_content"        android:layout_height="wrap_content"         android:orientation="horizontal">        <RadioButton            android:id="@+id/male"            android:layout_width="match_parent"            android:layout_height="match_parent"             android:text="@string/male"/>         <RadioButton            android:id="@+id/female"            android:layout_width="match_parent"            android:layout_height="match_parent"             android:text="@string/female"/>    </RadioGroup></LinearLayout>

MainActivity.java

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 MainActivity extends Activity implements OnCheckedChangeListener{    private  TextView xz;    private RadioGroup sex;    private RadioButton male;    private RadioButton female;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        xz=(TextView) findViewById(R.id.xz);        sex=(RadioGroup) findViewById(R.id.sex);        male=(RadioButton) findViewById(R.id.male);        female=(RadioButton) findViewById(R.id.female);        sex.setOnCheckedChangeListener(MainActivity.this);    }    @Override    public void onCheckedChanged(RadioGroup group, int checkedId) {        String result = null;        if (male.getId()==checkedId) {            result=male.getText().toString();        }else if(female.getId()==checkedId){            result=female.getText().toString();        }        xz.setText("您选择的性别是："+result);      }}

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