实现方式
实现的方式有很多种 这里总结最常见的几种方式,以后再添加其他的。
viewPager + RadioGroup
viewPager + FragmentTabHost
viewpager +TabLayout
viewPager+RadioGroup
感觉这是最简单的一个了,我也就不贴代码 说说我理解的思路吧
通过给pager 和RadioGroup 添加监听,监听两个控件的变化 实现联动
当viewPager的显示pager改变就会触发监听 ,在监听中选中对应的RadioButton即可
当RadioGroup发生 选中改变时也会触发监听 ,在选中改变后 设置显示对应的pager即可
FragmentTabHost +viewpager
这个方式 跟上面那个方式差不多 都是通过 监听 实现联动
如果只使用FragmentTabHost 只能实现 点击tab切换 页面的效果 不能实现左右滑动 而 结合viewPager 刚好实现这一效果
先来看看FragmentTabHost经常用的方法
- setup() 在使用addTab之前ref="https://xwenw.com/tag/%e8%b0%83%e7%94%a8" target="_blank">调用 设置必要的数据 如 FragmentManager,Fragment的容器id - addTab() 添加标签 - newTabSpec() 新建 tab - setCurrentTab() 设置当前显示的标签 - setOnChangeTabListtener 设置tab选中改变监听 - tabHost.getTabWidget().setDividerDrawable(null); //去除间隔线 - Tab的常用方法: - setIndicator() 可以设置view 和 字符串 main布局 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_tab_pager" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.skymxc.demo.fragment.TabPagerActivity"> <android.support.v4.view.ViewPager android:id="@+id/pager" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"></android.support.v4.view.ViewPager> <android.support.v4.app.FragmentTabHost android:id="@+id/tab_host" android:layout_width="match_parent" android:layout_height="wrap_content"></android.support.v4.app.FragmentTabHost> </LinearLayout>
Framgent 简单起见 就不写布局文件了 其他的Fragment 跟这个类似
public class DiscoverFragment extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { TextView textView = new TextView(getActivity()); textView.setText("发现"); textView.setGravity(Gravity.CENTER); return textView; } }
tab 的布局 图片在上 文本在下 比较简单
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:id="@+id/icon" android:layout_width="30dp" android:layout_height="30dp" android:layout_gravity="center"/> <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@color/selector_font" android:text="发现" android:layout_gravity="center"/> </LinearLayout>
selector 基本类似 这里贴一个
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_selected="true" android:drawable="@mipmap/cb_icon_discover_selected"/> <item android:drawable="@mipmap/cb_icon_discover_normal"/> </selector>
java 代码
初始化 TabHost
private void initTabHost() { tabHost.setup(this,getSupportFragmentManager(), R.id.pager); tabHost.getTabWidget().setDividerDrawable(null); tabHost.addTab(tabHost.newTabSpec("discover").setIndicator(createView(R.drawable.selector_bg,"发现")), DiscoverFragment.class,null); tabHost.addTab(tabHost.newTabSpec("attach").setIndicator(createView(R.drawable.selector_bg_attach,"关注")), AttachFragment.class,null); tabHost.addTab(tabHost.newTabSpec("message").setIndicator(createView(R.drawable.selector_bg_message,"消息")), MsgFragment.class,null); tabHost.addTab(tabHost.newTabSpec("info").setIndicator(createView(R.drawable.selector_bg_info,"我的")), ContactFragment.class,null); }
初始化 pager 并绑定适配器
/** * 初始化 pager 绑定适配器 */ private void initPager() { fragments = new ArrayList<>(); fragments.add(new DiscoverFragment()); fragments.add(new AttachFragment()); fragments.add(new MsgFragment()); fragments.add(new ContactFragment()); FragmentAdapter adapter = new FragmentAdapter(getSupportFragmentManager(),fragments); pager.setAdapter(adapter); }
分别给 TabHost 和pager 添加监听 实现联动
/** * 为TabHost和viewPager 添加监听 让其联动 */ private void bindTabAndPager() { tabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() { /** * tab改变后 * @param tabId 当前tab的tag */ @Override public void onTabChanged(String tabId) { log("vonTabChanged:"+tabId); int position = tabHost.getCurrentTab(); pager.setCurrentItem(position,true); } }); pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { /** * 页面滑动 触发 * @param position 当前显得第一个页面的索引,当滑动出现时屏幕就会显示两个pager, 向右滑 position为当前-1(左边的pager就显示出来了),向左滑position为当前(右面就显出来了), * @param positionOffset 0-1之间 position的偏移量 从原始位置的偏移量 * @param positionOffsetPixels 从position偏移的像素值 从原始位置的便宜像素 */ @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { log("onPageScrolled=============position:"+position+"====positionOffset:"+positionOffset+"====positionOffsetPixels:"+positionOffsetPixels); } /** * 页面选中后 * @param position 当前页面的index */ @Override public void onPageSelected(int position) { tabHost.setCurrentTab(position); log("onPageSelected==========:position:"+position); } /** * 页面滑动状态改变时触发 * @param state 当前滑动状态 共三个状态值 */ @Override public void onPageScrollStateChanged(int state) { String stateStr=""; switch (state){ case ViewPager.SCROLL_STATE_DRAGGING: stateStr="正在拖动"; break; case ViewPager.SCROLL_STATE_SETTLING: stateStr="正在去往最终位置 即将到达最终位置"; break; case ViewPager.SCROLL_STATE_IDLE: stateStr="滑动停止,当前页面充满屏幕"; break; } log("onPageScrollStateChanged========stateCode:"+state+"====state:"+stateStr); } }); }
完整代码
public class TabPagerActivity extends AppCompatActivity { private static final String TAG ="TabPagerActivity"; private FragmentTabHost tabHost; private ViewPager pager; private List<Fragment> fragments; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_tab_pager); tabHost = (FragmentTabHost) findViewById(R.id.tab_host); pager = (ViewPager) findViewById(R.id.pager); //初始化TabHost initTabHost(); //初始化pager initPager(); //添加监听关联TabHost和viewPager bindTabAndPager(); } /** * 为TabHost和viewPager 添加监听 让其联动 */ private void bindTabAndPager() { tabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() { /** * tab改变后 * @param tabId 当前tab的tag */ @Override public void onTabChanged(String tabId) { log("vonTabChanged:"+tabId); int position = tabHost.getCurrentTab(); pager.setCurrentItem(position,true); } }); pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { /** * 页面滑动 触发 * @param position 当前显得第一个页面的索引,当滑动出现时屏幕就会显示两个pager, 向右滑 position为当前-1(左边的pager就显示出来了),向左滑position为当前(右面就显出来了), * @param positionOffset 0-1之间 position的偏移量 从原始位置的偏移量 * @param positionOffsetPixels 从position偏移的像素值 从原始位置的便宜像素 */ @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { log("onPageScrolled=============position:"+position+"====positionOffset:"+positionOffset+"====positionOffsetPixels:"+positionOffsetPixels); } /** * 页面选中后 * @param position 当前页面的index */ @Override public void onPageSelected(int position) { tabHost.setCurrentTab(position); log("onPageSelected==========:position:"+position); } /** * 页面滑动状态改变时触发 * @param state 当前滑动状态 共三个状态值 */ @Override public void onPageScrollStateChanged(int state) { String stateStr=""; switch (state){ case ViewPager.SCROLL_STATE_DRAGGING: stateStr="正在拖动"; break; case ViewPager.SCROLL_STATE_SETTLING: stateStr="正在去往最终位置 即将到达最终位置"; break; case ViewPager.SCROLL_STATE_IDLE: stateStr="滑动停止,当前页面充满屏幕"; break; } log("onPageScrollStateChanged========stateCode:"+state+"====state:"+stateStr); } }); } /** * 初始化 pager 绑定适配器 */ private void initPager() { fragments = new ArrayList<>(); fragments.add(new DiscoverFragment()); fragments.add(new AttachFragment()); fragments.add(new MsgFragment()); fragments.add(new ContactFragment()); FragmentAdapter adapter = new FragmentAdapter(getSupportFragmentManager(),fragments); pager.setAdapter(adapter); } /** * 初始化 TabHost */ private void initTabHost() { tabHost.setup(this,getSupportFragmentManager(), R.id.pager); tabHost.getTabWidget().setDividerDrawable(null); tabHost.addTab(tabHost.newTabSpec("discover").setIndicator(createView(R.drawable.selector_bg,"发现")), DiscoverFragment.class,null); tabHost.addTab(tabHost.newTabSpec("attach").setIndicator(createView(R.drawable.selector_bg_attach,"关注")), AttachFragment.class,null); tabHost.addTab(tabHost.newTabSpec("message").setIndicator(createView(R.drawable.selector_bg_message,"消息")), MsgFragment.class,null); tabHost.addTab(tabHost.newTabSpec("info").setIndicator(createView(R.drawable.selector_bg_info,"我的")), ContactFragment.class,null); } /** * 返回view * @param icon * @param tab * @return */ private View createView(int icon,String tab){ View view = getLayoutInflater().inflate(R.layout.fragment_tab_discover,null); ImageView imageView = (ImageView) view.findViewById(R.id.icon); TextView title = (TextView) view.findViewById(R.id.title); imageView.setImageResource(icon); title.setText(tab); return view; } private void log(String log){ Log.e(TAG,"="+log+"="); } }
效果如下:
viewpager +TabLayout
TabLayout 输入 design的扩展包 使用之前必须得先导入扩展包
tabLayout 可以自动去关联 viewPager 只需为tabLayout 指定关联的viewPager就可以了
这样是方便了很多,但是也有缺点,在自动关联之后 tabLayout会自动去读取 viewPager的title,想使用自定的view当做tab就不可能了
导入 design 扩展包 并排在v7上面
布局 这里使用了两个TabLayout 分别实现 自动关联 和 手动关联
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/activity_tab_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.skymxc.demo.fragment.TabLayoutActivity"> <!-- 使用自动关联--> <android.support.design.widget.TabLayout android:id="@+id/tab_layout" android:layout_width="match_parent" android:layout_height="wrap_content" app:tabMode="fixed" app:tabSelectedTextColor="#f0f" app:tabIndicatorColor="#f0f"></android.support.design.widget.TabLayout> <android.support.v4.view.ViewPager android:id="@+id/container" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"></android.support.v4.view.ViewPager> <!--通过监听去关联--> <android.support.design.widget.TabLayout android:id="@+id/tab_layout_menu" android:layout_width="match_parent" android:layout_height="wrap_content" app:tabMode="fixed" app:tabSelectedTextColor="#ff0" app:tabIndicatorColor="#ff0"></android.support.design.widget.TabLayout> </LinearLayout>
初始化 自动关联的tab 并和viewPager绑定
private void initTabLayoutAndPager() { //关联 viewPager 使用关联后 tab就会自动去获取pager的title,使用addTab就会无效 tabLayout.setupWithViewPager(pager); fragments = new ArrayList<>(); fragments.add(new DiscoverFragment()); fragments.add(new AttachFragment()); fragments.add(new MsgFragment()); fragments.add(new ContactFragment()); adapter = new FragmentAdapter(getSupportFragmentManager(),fragments); pager.setAdapter(adapter); }
tab的布局和上面是一样的。
为TabLayout 添加view 自动关联添加也没用
tabLayoutMenu.addTab(tabLayoutMenu.newTab().setCustomView(createView(R.drawable.selector_bg,"发现"))); tabLayoutMenu.addTab(tabLayoutMenu.newTab().setCustomView(createView(R.drawable.selector_bg_attach,"关注"))); tabLayoutMenu.addTab(tabLayoutMenu.newTab().setCustomView(createView(R.drawable.selector_bg_message,"消息"))); tabLayoutMenu.addTab(tabLayoutMenu.newTab().setCustomView(createView(R.drawable.selector_bg_info,"我的"))); tabLayoutMenu.setSelectedTabIndicatorHeight(0);//去除指示器
设置 viewPager的监听和 TabLayout的监听 实现联动
tabLayoutMenu.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() { /** * 选中tab后触发 * @param tab 选中的tab */ @Override public void onTabSelected(TabLayout.Tab tab) { //与pager 关联 pager.setCurrentItem(tab.getPosition(),true); } /** * 退出选中状态时触发 * @param tab 退出选中的tab */ @Override public void onTabUnselected(TabLayout.Tab tab) { } /** * 重复选择时触发 * @param tab 被 选择的tab */ @Override public void onTabReselected(TabLayout.Tab tab) { } }); pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { //关联 TabLayout tabLayoutMenu.getTabAt(position).select(); } @Override public void onPageScrollStateChanged(int state) { } });
完整代码
package com.skymxc.demo.fragment; import android.support.design.widget.TabLayout; import android.support.v4.app.Fragment; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.ImageView; import android.widget.TextView; import com.skymxc.demo.fragment.adapter.FragmentAdapter; import com.skymxc.demo.fragment.fragment.AttachFragment; import com.skymxc.demo.fragment.fragment.ContactFragment; import com.skymxc.demo.fragment.fragment.DiscoverFragment; import com.skymxc.demo.fragment.fragment.MsgFragment; import java.util.ArrayList; import java.util.List; public class TabLayoutActivity extends AppCompatActivity { private TabLayout tabLayout; private ViewPager pager; private TabLayout tabLayoutMenu; private FragmentAdapter adapter ; private List<Fragment> fragments; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_tab_layout); tabLayout = (TabLayout) findViewById(R.id.tab_layout); pager = (ViewPager) findViewById(R.id.container); tabLayoutMenu = (TabLayout) findViewById(R.id.tab_layout_menu); initTabLayoutAndPager(); //想使用自己的布局就得 通过 监听进行关联 bindPagerAndTab(); } private void bindPagerAndTab() { tabLayoutMenu.addTab(tabLayoutMenu.newTab().setCustomView(createView(R.drawable.selector_bg,"发现"))); tabLayoutMenu.addTab(tabLayoutMenu.newTab().setCustomView(createView(R.drawable.selector_bg_attach,"关注"))); tabLayoutMenu.addTab(tabLayoutMenu.newTab().setCustomView(createView(R.drawable.selector_bg_message,"消息"))); tabLayoutMenu.addTab(tabLayoutMenu.newTab().setCustomView(createView(R.drawable.selector_bg_info,"我的"))); tabLayoutMenu.setSelectedTabIndicatorHeight(0);//去除指示器 tabLayoutMenu.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() { /** * 选中tab后触发 * @param tab 选中的tab */ @Override public void onTabSelected(TabLayout.Tab tab) { //与pager 关联 pager.setCurrentItem(tab.getPosition(),true); } /** * 退出选中状态时触发 * @param tab 退出选中的tab */ @Override public void onTabUnselected(TabLayout.Tab tab) { } /** * 重复选择时触发 * @param tab 被 选择的tab */ @Override public void onTabReselected(TabLayout.Tab tab) { } }); pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { //关联 TabLayout tabLayoutMenu.getTabAt(position).select(); } @Override public void onPageScrollStateChanged(int state) { } }); } private void initTabLayoutAndPager() { //关联 viewPager 使用关联后 tab就会自动去获取pager的title,使用addTab就会无效 tabLayout.setupWithViewPager(pager); fragments = new ArrayList<>(); fragments.add(new DiscoverFragment()); fragments.add(new AttachFragment()); fragments.add(new MsgFragment()); fragments.add(new ContactFragment()); adapter = new FragmentAdapter(getSupportFragmentManager(),fragments); pager.setAdapter(adapter); } private View createView(int icon, String tab){ View view = getLayoutInflater().inflate(R.layout.fragment_tab_discover,null); ImageView imageView = (ImageView) view.findViewById(R.id.icon); TextView title = (TextView) view.findViewById(R.id.title); imageView.setImageResource(icon); title.setText(tab); return view; } }
效果图
这里贴一下 viewPager的适配器
public class FragmentAdapter extends FragmentPagerAdapter { List<Fragment> fragments ; private String[] titles = new String[]{"发现","关注","消息","我的"}; public FragmentAdapter(FragmentManager fm,List<Fragment> fragments) { super(fm); this.fragments =fragments; } @Override public Fragment getItem(int position) { return fragments.get(position); } @Override public int getCount() { return fragments ==null ?0:fragments.size(); } @Override public CharSequence getPageTitle(int position) { return titles[position]; } }
目前就总结了这几种方式 想到别的方式 再总结
关于这个 Demo的github :https://github.com/sky-mxc/AndroidDemo/tree/master/fragment
以上所示是小编给大家介绍的Android开发之微信底部菜单栏实现的几种方法汇总,希望对大家有所帮助!
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