Android仿微信主界面的实现方法

<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" >

  <include layout="@layout/top" />

  <android.support.v4.view.ViewPager
    android:id="@+id/vp_content"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1" >
  </android.support.v4.view.ViewPager>

  <include layout="@layout/bottom" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RadioGroup xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/rg_tab_container"
  android:layout_width="match_parent"
  android:layout_height="@dimen/bar_height"
  android:background="@drawable/bottom_bar"
  android:gravity="center"
  android:orientation="horizontal" >

  <RadioButton
    android:id="@+id/rb_tab_weixin"
    
    android:checked="true"
    android:drawableTop="@drawable/tab_weixin_selector"
    android:text="@string/tab_weixin" />

  <RadioButton
    android:id="@+id/rb_tab_friend"
    
    android:drawableTop="@drawable/tab_friend_selector"
    android:text="@string/tab_friend" />

  <RadioButton
    android:id="@+id/rb_tab_contact"
    
    android:drawableTop="@drawable/tab_contact_selector"
    android:text="@string/tab_contact" />

  <RadioButton
    android:id="@+id/rb_tab_setting"
    
    android:drawableTop="@drawable/tab_setting_selector"
    android:text="@string/tab_setting" />

</RadioGroup>

/**
 * 主界面 模仿微信界面
 * 
 * @author admin
 * 
 */
public class MainActivity extends FragmentActivity {

  /** tab */
  private RadioGroup mRadioGroup;

  private RadioButton weixinRadioButton;
  private RadioButton friendRadioButton;
  private RadioButton contactRadioButton;
  private RadioButton settingRadioButton;

  /** 显示内容容器 */
  private ViewPager mViewPager;

  private List<Fragment> fragments;

  private Fragment mWeiXinFragment;
  private Fragment mFriendFragment;
  private Fragment mContactFragment;
  private Fragment mSettingFragment;

  private FragmentPagerAdapter mFragmentPagerAdapter;

  private final static int TAB_WEIXIN = 0;
  private final static int TAB_FRIEND = 1;
  private final static int TAB_CONTACT = 2;
  private final static int TAB_SETTING = 3;

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

    initView();

    initEvent();
  }

  private void initEvent() {

    mRadioGroup.setOnCheckedChangeListener(myCheckedChangeListener);
    mViewPager.setOnPageChangeListener(myOnPageChangeListener);
  }

  private void initView() {
    mRadioGroup = (RadioGroup) findViewById(R.id.rg_tab_container);

    weixinRadioButton = (RadioButton) findViewById(R.id.rb_tab_weixin);
    friendRadioButton = (RadioButton) findViewById(R.id.rb_tab_friend);
    contactRadioButton = (RadioButton) findViewById(R.id.rb_tab_contact);
    settingRadioButton = (RadioButton) findViewById(R.id.rb_tab_setting);

    mViewPager = (ViewPager) findViewById(R.id.vp_content);

    fragments = new ArrayList<Fragment>();

    mWeiXinFragment = new WeiXinFragment();
    mFriendFragment = new FriendFragment();
    mContactFragment = new ContactFragment();
    mSettingFragment = new SettingFragment();

    fragments.add(mWeiXinFragment);
    fragments.add(mFriendFragment);
    fragments.add(mContactFragment);
    fragments.add(mSettingFragment);
//这里需要继承FragmentActivity
    mFragmentPagerAdapter = new FragmentAdapter(getSupportFragmentManager());
    mViewPager.setAdapter(mFragmentPagerAdapter);

  }

  /**
   * 当页面切换时，tab也跟着切换
   */
  private OnPageChangeListener myOnPageChangeListener = new OnPageChangeListener() {

    @Override
    public void onPageSelected(int arg0) {
      switch (arg0) {
      case TAB_WEIXIN:

        if (!weixinRadioButton.isChecked()) {
          weixinRadioButton.setChecked(true);
        }
        break;
      case TAB_FRIEND:
        friendRadioButton.setChecked(true);

        break;
      case TAB_CONTACT:
        contactRadioButton.setChecked(true);

        break;
      case TAB_SETTING:
        settingRadioButton.setChecked(true);

        break;

      }
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {

    }

    @Override
    public void onPageScrollStateChanged(int arg0) {

    }
  };

  /**
   * 点击tab，切换到相应的页面
   */
  private OnCheckedChangeListener myCheckedChangeListener = new OnCheckedChangeListener() {

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {

      switch (checkedId) {
      case R.id.rb_tab_weixin:

        mViewPager.setCurrentItem(TAB_WEIXIN);
        break;
      case R.id.rb_tab_friend:

        mViewPager.setCurrentItem(TAB_FRIEND);
        break;
      case R.id.rb_tab_contact:

        mViewPager.setCurrentItem(TAB_CONTACT);
        break;
      case R.id.rb_tab_setting:
        mViewPager.setCurrentItem(TAB_SETTING);

        break;

      }
    }
  };

  private class FragmentAdapter extends FragmentPagerAdapter {

    public FragmentAdapter(FragmentManager fm) {
      super(fm);
    }

    @Override
    public Fragment getItem(int arg0) {
      return fragments.get(arg0);
    }

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

  }

}