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如图效果,可以点击底部按钮选择页面,也可以滑动页面进行选择。
那么我们下面就来实现一下吧。
首先创建工程WXTest,主界面布局使用ViewPager+RadioGroup来实现,界面代码如下。
在MainActivity中进行初始化数据
mViewPager = (ViewPager) findViewById(R.id.view_pager); mRGContain = (RadioGroup) findViewById(R.id.rg_contain); mRBWX = (RadioButton) findViewById(R.id.rb_wx); mRBBook = (RadioButton) findViewById(R.id.rb_book); mRBDiscover = (RadioButton) findViewById(R.id.rb_discover); mRBMe = (RadioButton) findViewById(R.id.rb_me); //给图标设置大小 Drawable drawableRbWX = mRBWX.getCompoundDrawables()[1]; drawableRbWX.setBounds(0,0, dp2px(24),dp2px(24)); mRBWX.setCompoundDrawables(null,drawableRbWX,null,null); Drawable drawableRbBook = mRBBook.getCompoundDrawables()[1]; drawableRbBook.setBounds(0,0, dp2px(24), dp2px(24)); mRBBook.setCompoundDrawables(null,drawableRbBook,null,null); Drawable drawableRbDiscover = mRBDiscover.getCompoundDrawables()[1]; drawableRbDiscover.setBounds(0,0, dp2px(24), dp2px(24)); mRBDiscover.setCompoundDrawables(null,drawableRbDiscover,null,null); Drawable drawableRbMe = mRBMe.getCompoundDrawables()[1]; drawableRbMe.setBounds(0,0, dp2px(24), dp2px(24)); mRBMe.setCompoundDrawables(null,drawableRbMe,null,null); /** * dp 转 px * @param dp * @return */ public int dp2px(int dp) { // 1、获取屏幕密度 float density = getApplicationContext().getResources().getDisplayMetrics().density; // 2、进行乘法操作 return (int) (dp * density + 0.5); }
给ViewPager设置数据我们使用FragmentPagerAdapter ,所以MainActivity需要继承FragmentActivity。Fragment选择V4包,可以兼容低版本。
新建BaseFragment继承Fragment,让子类实现initView()方法。
public abstract class BaseFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return initView(inflater,container,savedInstanceState); } public abstract View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState); }
微信界面
public class WXFragment extends BaseFragment { @Override public View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.wx_fragment, container,false); return view; } }
wx_fragment.xml代码
其余三个界面类似
/** * 通讯录界面 */ public class BookFragment extends BaseFragment { @Override public View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.book_fragment, container,false); return view; } } /** * 发现界面 */ public class DiscoverFragment extends BaseFragment { @Override public View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.discover_fragment, container,false); return view; } } /** * 我界面 */ public class MeFragment extends BaseFragment { @Override public View initView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.me_fragment, container,false); return view; } }
然后使用MainFragmentFactory来存储页面Fragment
package com.example.wxtest.fragment; import java.util.HashMap; public class MainFragmentFactory { private static HashMapmSavedFragment = new HashMap (); //根据position得到对应的fragment public static BaseFragment getFragment(int position) { BaseFragment fragment = mSavedFragment.get(position); if(fragment == null) { switch (position) { case 0: fragment = new WXFragment(); break; case 1: fragment = new BookFragment(); break; case 2: fragment = new DiscoverFragment(); break; case 3: fragment = new MeFragment(); break; } //创建之后保存 mSavedFragment.put(position, fragment); } return fragment; } public static void deleteFragment(){ for (int i = 0 ; i < 4 ; i++){ mSavedFragment.remove(i); } } }
适配器
/** * 适配器 */ class MainFragmentAdapter extends FragmentPagerAdapter { public MainFragmentAdapter(FragmentManager fm) { super(fm); } //根据position的值 返回对应的fragment对象 @Override public Fragment getItem(int position) { Fragment fragment = MainFragmentFactory.getFragment(position); return fragment; } //返回ViewPager要显示的item数量 @Override public int getCount() { return 4; } }
ViewPager设置数据
//给ViewPager设置数据 mViewPager.setAdapter(new MainFragmentAdapter(getSupportFragmentManager()));
ViewPager页面选中监听
//界面改变监听 mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } //当前选中页面 @Override public void onPageSelected(int position) { switch (position){ case 0: mRGContain.check(R.id.rb_wx); break; case 1: mRGContain.check(R.id.rb_book); break; case 2: mRGContain.check(R.id.rb_discover); break; case 3: mRGContain.check(R.id.rb_me); break; default: break; } } @Override public void onPageScrollStateChanged(int state) { } });
RadioGroup选中监听
//RadioGroup选中监听 mRGContain.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { switch (checkedId){ case R.id.rb_wx: //微信 mViewPager.setCurrentItem(0,false); break; case R.id.rb_book: //通讯录 mViewPager.setCurrentItem(1,false); break; case R.id.rb_discover: //发现 mViewPager.setCurrentItem(2,false); break; case R.id.rb_me: //我 mViewPager.setCurrentItem(3,false); break; default: break; } } }); //选中微信界面 mRGContain.check(R.id.rb_wx);
然后运行程序,就可以实现图中的效果了!
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