Use code to control vertical or horizontal layout for RadioGroup

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout// www.  j  ava 2s.  co  m
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <RadioGroup android:id="@+id/orientation"
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5px">
        <RadioButton
            android:id="@+id/horizontal"
            android:text="horizontal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <RadioButton
            android:id="@+id/vertical"
            android:text="vertical"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </RadioGroup>
    <RadioGroup android:id="@+id/gravity"
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="5px">
        <RadioButton
            android:id="@+id/left"
            android:text="left"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <RadioButton
            android:id="@+id/center"
            android:text="center"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <RadioButton
            android:id="@+id/right"
            android:text="right"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </RadioGroup>
</LinearLayout>

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.text.TextWatcher;
import android.widget.LinearLayout;
import android.widget.RadioGroup;
import android.widget.EditText;
/*www .jav a  2 s .  c om*/
public class MainActivity extends Activity
  implements RadioGroup.OnCheckedChangeListener {
  RadioGroup orientation;
  RadioGroup gravity;
  
  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    
    orientation=(RadioGroup)findViewById(R.id.orientation);
    orientation.setOnCheckedChangeListener(this);
    gravity=(RadioGroup)findViewById(R.id.gravity);
    gravity.setOnCheckedChangeListener(this);
  }
  
  public void onCheckedChanged(RadioGroup group, int checkedId) {
    if (group==orientation) {
      if (checkedId==R.id.horizontal) {
        orientation.setOrientation(LinearLayout.HORIZONTAL);
      }
      else {
        orientation.setOrientation(LinearLayout.VERTICAL);
      }
    }
    else if (group==gravity) {
      if (checkedId==R.id.left) {
        gravity.setGravity(Gravity.LEFT);
      }
      else if (checkedId==R.id.center) {
        gravity.setGravity(Gravity.CENTER_HORIZONTAL);
      }
      else if (checkedId==R.id.right) {
        gravity.setGravity(Gravity.RIGHT);
      }
    }
  }
}