日积月累：在RadioGroup中实现RadioButton的线性布局

在工作过程中，由于需求的要求，需要将多个单选按钮进行行列布局。效果如下图所示： 

由于使用RadioGroup，无奈只能实现单排，单列的单选按钮效果。经过查阅文档发现RadioGroup继承LinearLayout，就想着使用嵌套布局来实现，于是就有了如下想法： 

 <RadioGroup > 
      <LinearLayout> 
          <RadioButto /> 
          <RadioButto /> 
      </LinearLayout> 
      <LinearLayou> 
          <RadioButto /> 
          <RadioButto /> 
      </LinearLayout> 
      <LinearLayout > 
            <RadioButto /> 
      </LinearLayout> 
</RadioGroup> 

但是运行后才发现，RadioButton间，并没有单选按钮相互斥选择的效果了。后来查询各种资料和思考，发现一种替代的解决办法，可能稍有麻烦，但却是能实现需求，现在展示如下： 

布局文件main.xml，通过多组的RadioGroup来实现RadioButton的线性布局: 

<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" > 
    <RadioGroup 
        android:id="@+id/orderBy1" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:orientation="horizontal" > 
        <RadioButton 
            android:id="@+id/orderBy1.1" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="名称" /> 
        <RadioButton 
            android:id="@+id/orderBy1.2" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="日期" /> 
    </RadioGroup> 
    <RadioGroup 
        android:id="@+id/orderBy2" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:orientation="horizontal" > 
        <RadioButton 
            android:id="@+id/orderBy2.1" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="类型" /> 
        <RadioButton 
            android:id="@+id/orderBy2.2" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="大小" /> 
    </RadioGroup> 
    <RadioGroup 
        android:id="@+id/orderBy3" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:orientation="horizontal" > 
        <RadioButton 
            android:id="@+id/orderBy3.3" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="系统默认" /> 
    </RadioGroup> 
</LinearLayout> 

主文件MainActivity.java，通过使用RadioGruop.OnCheckedChangeListener来处理不同组RadioGroup的互斥逻辑: 

public class MainActivity extends Activity { 
 
    private RadioGroup radioGroup1; 
    private RadioGroup radioGroup2; 
    private RadioGroup radioGroup3; 
    private Boolean changeedGroup = false; 
 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
 
        radioGroup1 = (RadioGroup) findViewById(R.id.orderBy1); 
        radioGroup1.setOnCheckedChangeListener(new MyRadioGroupOnCheckedChangedListener()); 
        radioGroup2 = (RadioGroup) findViewById(R.id.orderBy2); 
        radioGroup2.setOnCheckedChangeListener(new MyRadioGroupOnCheckedChangedListener()); 
        radioGroup3 = (RadioGroup) findViewById(R.id.orderBy3); 
        radioGroup3.setOnCheckedChangeListener(new MyRadioGroupOnCheckedChangedListener()); 
    } 
 
    class MyRadioGroupOnCheckedChangedListener implements OnCheckedChangeListener { 
        @Override 
        public void onCheckedChanged(RadioGroup group, int checkedId) { 
            if (!changeedGroup) { 
                changeedGroup = true; 
                if (group == radioGroup1) { 
                    radioGroup2.clearCheck(); 
                    radioGroup3.clearCheck(); 
                } else if (group == radioGroup2) { 
                    radioGroup1.clearCheck(); 
                    radioGroup3.clearCheck(); 
                } else if (group == radioGroup3) { 
                    radioGroup1.clearCheck(); 
                    radioGroup2.clearCheck(); 
                } 
                changeedGroup = false; 
            } 
       } 
    } 
} 

运行后，3行2列的RadioButton完成了线程布局，并且具有互斥选择的逻辑。