Android控制項：RadioButton(單選button)

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首先，在布局檔案 activity_main.xml中注冊一個RadioGroup,並為RadioGroup設定監聽，圖中兩個RadioButton為一個RadioGroup。

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"    tools:context=".MainActivity">    <TextView android:text="@string/hello_world"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <RadioGroup        android:id="@+id/radioGroupID"        android:layout_width="wrap_content"        android:layout_height="wrap_content" >        <RadioButton            android:id="@+id/femaleGroupID"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="female"            />        <RadioButton            android:id="@+id/maleGroupID"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="male"/>    </RadioGroup></LinearLayout>

MainActivity.java

import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.RadioButton;import android.widget.RadioGroup;public class MainActivity extends ActionBarActivity {    private RadioGroup radioGroup;    private RadioButton femaleRadioButton;    private RadioButton maleRadioButton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //載入布局檔案        setContentView(R.layout.activity_main);        //擷取執行個體        radioGroup=(RadioGroup)findViewById(R.id.radioGroupID);        femaleRadioButton=(RadioButton)findViewById(R.id.femaleGroupID);        maleRadioButton=(RadioButton)findViewById(R.id.maleGroupID);        //設定監聽        radioGroup.setOnCheckedChangeListener(new RadioGroupListener());    }    //定義一個RadioGroup的OnCheckedChangeListener    //RadioGroup  綁定的是RadioGroup.OnCheckedChangeListener    //CheckBox    綁定的是CompoundButton.OnCheckedChangeListener 或者 view.OnClickListener     class RadioGroupListener implements RadioGroup.OnCheckedChangeListener{        @Override        public void onCheckedChanged(RadioGroup group, int checkedId) {            if (checkedId==femaleRadioButton.getId()){                System.out.println("選中了female!");            }else if (checkedId==maleRadioButton.getId()){                System.out.println("選中了male!");            }        }    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.menu_main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        //noinspection SimplifiableIfStatement        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}

日誌顯示範範例如以下：

   

Android控制項：RadioButton(單選button)