ViewPager微信切换页面

布局文件:

<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
     ns:tools=\"http://schemas.android.com/tools\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\"
    android:orientation=\"vertical\" >

    <android.support.v4.view.ViewPager 
        android:id=\"@+id/pager\"
        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:gravity=\"center\"
        android:orientation=\"horizontal\" >

        <!-- android:button=\"@null\"取消单选那个原点 -->

        <RadioButton
            android:id=\"@+id/radio0\"
            android:layout_width=\"0dp\"
            android:layout_height=\"wrap_content\"
            android:layout_weight=\"1\"
            android:button=\"@null\"
            android:drawableTop=\"@drawable/sel_button\"
            android:gravity=\"center\"
            android:padding=\"5dp\"
            android:text=\"消息\" />

        <RadioButton
            android:id=\"@+id/radio1\"
            android:layout_width=\"0dp\"
            android:layout_height=\"wrap_content\"
            android:layout_weight=\"1\"
            android:button=\"@null\"
            android:drawableTop=\"@drawable/sel_button\"
            android:gravity=\"center\"
            android:padding=\"5dp\"
            android:text=\"消息\" />

        <RadioButton
            android:id=\"@+id/radio2\"
            android:layout_width=\"0dp\"
            android:layout_height=\"wrap_content\"
            android:layout_weight=\"1\"
            android:button=\"@null\"
            android:drawableTop=\"@drawable/sel_button\"
            android:gravity=\"center\"
            android:padding=\"5dp\"
            android:text=\"消息\" />

        <RadioButton
            android:id=\"@+id/radio3\"
            android:layout_width=\"0dp\"
            android:layout_height=\"wrap_content\"
            android:layout_weight=\"1\"
            android:button=\"@null\"
            android:drawableTop=\"@drawable/sel_button\"
            android:gravity=\"center\"
            android:padding=\"5dp\"
            android:text=\"消息\" />
    </RadioGroup>

</LinearLayout>

MainActivity代码:

public class MainActivity extends FragmentActivity {

	private ArrayList<Fragment> list;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		// 1 写viewpager
		final ViewPager pager = (ViewPager) findViewById(R.id.pager);
		// 2继承FragmentActivity
		// 3集合和Fragment对象(注意Fragment要导入v4包)
		list = new ArrayList<Fragment>();
		list.add(new Frag01());
		list.add(new Frag02());
		list.add(new Frag03());
		list.add(new Frag04());
		// 4设置适配器
		// 注意要写参数 参数为getSupportFragmentManager()
		pager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {

			@Override
			public int getCount() {
				return list.size();
			}

			@Override
			public Fragment getItem(int arg0) {
				return list.get(arg0);
			}
		});
		// 5点击按钮切换页面
		final RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioGroup1);
		// 6第一个默认选中
		radioGroup.check(radioGroup.getChildAt(0).getId());
		// 7点击按钮切换界面
		radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

			@Override
			public void onCheckedChanged(RadioGroup group, int checkedId) {
				switch (checkedId) {
				case R.id.radio0:
					pager.setCurrentItem(0);
					break;
				case R.id.radio1:
					pager.setCurrentItem(1);
					break;
				case R.id.radio2:
					pager.setCurrentItem(2);
					break;
				case R.id.radio3:
					pager.setCurrentItem(3);
					break;

				}

			}
		});
		// 8滑动切换
		pager.setOnPageChangeListener(new OnPageChangeListener() {

			@Override
			public void onPageSelected(int arg0) {
				radioGroup.check(radioGroup.getChildAt(arg0).getId());

			}

			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2) {
				// TODO Auto-generated method stub

			}

			@Override
			public void onPageScrollStateChanged(int arg0) {
				// TODO Auto-generated method stub

			}
		});

	}
}