按钮切换不同的Fragment

public class MainActivity extends FragmentActivity {

private FragmentManager manager;

@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);

	RadioGroup group = (RadioGroup) findViewById(R.id.radioGroup1);

	manager = getSupportFragmentManager();

	FragmentTransaction transaction = manager.beginTransaction();

	final Fragment1 one = new Fragment1();
	final Fragment2 two = new Fragment2();
	final Fragment3 three = new Fragment3();
	final Fragment4 four = new Fragment4();

	transaction.add(R.id.frag, one);
	transaction.add(R.id.frag, two);
	transaction.add(R.id.frag, three);
	transaction.add(R.id.frag, four);

	// 隐藏和显示
	transaction.hide(one);
	transaction.hide(two);
	transaction.hide(three);
	transaction.show(four);

	// 提交(s事物提交后 就不能再用了 如果想再用 就得重新开启)
	transaction.commit();

	// 点击事件 分类这些按钮的时候会触发这个事件
	group.setOnCheckedChangeListener(new OnCheckedChangeListener() {

		@Override
		public void onCheckedChanged(RadioGroup group, int checkedId) {
			// TODO Auto-generated method stub
			FragmentTransaction transaction2 = manager.beginTransaction();
			switch (checkedId) {
			case R.id.radio0:

				//隐藏
				transaction2.hide(two);
				transaction2.hide(three);
				transaction2.hide(four);
				//展示
				transaction2.show(one);
				
				break;
			case R.id.radio1:
				//隐藏
				transaction2.hide(one);
				transaction2.hide(three);
				transaction2.hide(four);
				//展示
				transaction2.show(two);
				break;
			case R.id.radio2:
				//隐藏
				transaction2.hide(two);
				transaction2.hide(one);
				transaction2.hide(four);
				//展示
				transaction2.show(three);
				break;
			case R.id.radio3:
				//隐藏
				transaction2.hide(two);
				transaction2.hide(three);
				transaction2.hide(one);
				//展示
				transaction2.show(four);
				break;
			default:
				break;
			}
			transaction2.commit();
		}
	});

}

}

activity_main.xml 布局文件中

<FrameLayout
    android:id="@+id/frag"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1" />

<RadioGroup
    android:id="@+id/radioGroup1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <RadioButton
        android:id="@+id/radio0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:button="@null"
        android:checked="true"
        android:drawableTop="@drawable/sel_message"
        android:gravity="center"
        android:padding="5dp"
        android:text="首页" />

    <RadioButton
        android:id="@+id/radio1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:button="@null"
        android:gravity="center"
        android:drawableTop="@drawable/sel_see"
        android:padding="5dp"
        android:text="分类" />

    <RadioButton
        android:id="@+id/radio2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:button="@null"
        android:drawableTop="@drawable/sel_start"
        android:gravity="center"
        android:padding="5dp"
        android:text="购物车" />

    <RadioButton
        android:id="@+id/radio3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:button="@null"
        android:drawableTop="@drawable/sel_people"
        android:gravity="center"
        android:padding="5dp"
        android:text="我的" />
</RadioGroup>

frag.xml 代码

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="aaaa" />