Android仿微信主界面的实现方法 Android仿微信主界面的实现方法
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先看一下效果图
实现的原理:
ViewPager+FragmentPagerAdapter
主界面可分为三部分:
- top标题栏就是一个TextView
- 中间的ViewPager作为显示的容器,填充Fragment
- bottom是一个RadioGroup
这里为了布局的优化,将top和bottom抽取出来 ,然后用include将其导入主布局,如下
<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>
bottom_tab的布局,为了方便管理将它们的共性抽取出来一个style
tab有两种状态,选中和非选中,因此将其背景做成一个选择器selector
<?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" style="@style/TabStyle" android:checked="true" android:drawableTop="@drawable/tab_weixin_selector" android:text="@string/tab_weixin" /> <RadioButton android:id="@+id/rb_tab_friend" style="@style/TabStyle" android:drawableTop="@drawable/tab_friend_selector" android:text="@string/tab_friend" /> <RadioButton android:id="@+id/rb_tab_contact" style="@style/TabStyle" android:drawableTop="@drawable/tab_contact_selector" android:text="@string/tab_contact" /> <RadioButton android:id="@+id/rb_tab_setting" style="@style/TabStyle" android:drawableTop="@drawable/tab_setting_selector" android:text="@string/tab_setting" /> </RadioGroup>
最后看一下作为Controller的Activity
- 先将需要的控件引入
- ViewPager内容的填充,主要是FragmentPagerAdapter适配器
- 将Fragment的初始化,将主界面显示的内容分别用Fragment管理,方便代码的管理。
- bottom_tab和ViewPager的关联,通过监听ViewPager页面的改变来改变tab的选中状态,然后再通过RadioGroup的事件来改变ViewPager的页面。
/** * 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(); } } }
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