Android使用ViewPager+Fragment实现标签分页

来源：互联网发布：建筑测量学知乎编辑：程序博客网时间：2024/05/31 19:36

本次列出的实例主要实现底部导航栏点击4个标签或滑动页面实现分页展示，采用的是viewpager+fragment的方法，使用一个主容器加4个fragment。

底部导航栏标签样式分选中和没有选中两种，因此，在编写底部导航栏的.xml文件前需先要在drawable下创建图片选择器与文字颜色选择器selector

此为其中一个按钮的图片选择器selector，其他的用相同的方法创建

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_checked="true" android:drawable="@mipmap/btn_home_s"></item>    <item android:state_checked="false" android:drawable="@mipmap/btn_home_n"></item></selector>

颜色选择

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_checked="true" android:color="#096f95"></item>    <item android:state_checked="false" android:color="#545658"></item></selector>

底部导航栏的布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent">    <android.support.v4.view.ViewPager        android:id="@+id/viewPager"        android:layout_width="match_parent"        android:layout_height="match_parent"/>    <RadioGroup        android:id="@+id/radioGroup"        android:layout_width="match_parent"        android:layout_height="55dp"        android:layout_alignParentBottom="true"        android:orientation="horizontal"        android:background="#ffffff">        <RadioButton            android:id="@+id/rb_home"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:button="@null"            android:background="@null"            android:layout_weight="1"            android:gravity="center"            android:layout_gravity="center"            android:textColor="@drawable/rb_text_color"            android:textSize="12sp"            android:checked="true"            android:text="首页"            android:drawableTop="@drawable/rb_home_selector"/>        <RadioButton            android:id="@+id/rb_healthdata"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:button="@null"            android:background="@null"            android:layout_weight="1"            android:gravity="center"            android:layout_gravity="center"            android:textColor="@drawable/rb_text_color"            android:textSize="12sp"            android:text="健康数据"            android:drawableTop="@drawable/rb_healthdata_selector"/>        <RadioButton            android:id="@+id/rb_illmanagement"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:button="@null"            android:background="@null"            android:layout_weight="1"            android:gravity="center"            android:layout_gravity="center"            android:textColor="@drawable/rb_text_color"            android:textSize="12sp"            android:text="慢病管理"            android:drawableTop="@drawable/rb_ill_selector"/>        <RadioButton            android:id="@+id/rb_myself"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:button="@null"            android:background="@null"            android:layout_weight="1"            android:gravity="center"            android:layout_gravity="center"            android:textColor="@drawable/rb_text_color"            android:textSize="12sp"            android:text="我"            android:drawableTop="@drawable/rb_myself_selector"/>    </RadioGroup></RelativeLayout>

在编写MainActivity.java前还需要有4个fragment的布局文件和Fragment.java，布局文件此处省略，主要能看出页面变化就行，Fragment.java如下（只列出了其中一个）

public class HomeFragment extends Fragment {    public HomeFragment(){    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_home, container, false);    }    }

主容器还需要一个适配器，该适配器继承了FragmentPagerAdapter，通过List存储要切换的Fragment

public class MainFragmentAdapter extends FragmentPagerAdapter {    private List<Fragment> list;    public MainFragmentAdapter(FragmentManager fm, List<Fragment> list) {        super(fm);        this.list = list;    }    @Override    public Fragment getItem(int position) {        return list.get(position);    }    @Override    public int getCount() {        return list.size();    }}

接下来就是MainActivity.java

public class MainActivity extends FragmentActivity {    private ViewPager viewPager;    private RadioGroup radioGroup;    private RadioButton rbHome,rbHealthdata,rbIllmanagement,rbMyself;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //设置状态栏颜色        StatusBarUtils.compat(this, Color.rgb(27,161,212));        setContentView(R.layout.activity_main);        initView();    }    private void initView(){        radioGroup = (RadioGroup)findViewById(R.id.radioGroup);        rbHome = (RadioButton)findViewById(R.id.rb_home);        rbHealthdata = (RadioButton)findViewById(R.id.rb_healthdata);        rbIllmanagement = (RadioButton)findViewById(R.id.rb_illmanagement);        rbMyself =(RadioButton)findViewById(R.id.rb_myself);        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                switch (checkedId) {                    case R.id.rb_home:                        /**                         * setCurrentItem第二个参数控制页面切换动画                         * true:打开/false:关闭                         */                        viewPager.setCurrentItem(0, false);                        break;                    case R.id.rb_healthdata:                        viewPager.setCurrentItem(1, false);                        break;                    case R.id.rb_illmanagement:                        viewPager.setCurrentItem(2, false);                        break;                    case R.id.rb_myself:                        viewPager.setCurrentItem(3, false);                        break;                }            }        });        /**         * ViewPager部分         */        viewPager = (ViewPager) findViewById(R.id.viewPager);        HomeFragment mHomeFragment = new HomeFragment();        HealthDataFragment mHealthDataFragment = new HealthDataFragment();        IllManagementFragment mIllManagementFragment = new IllManagementFragment();        MyselfFragment mMyselfFragment = new MyselfFragment();        List<Fragment> alFragment = new ArrayList<>();        alFragment.add(mHomeFragment);        alFragment.add(mHealthDataFragment);        alFragment.add(mIllManagementFragment);        alFragment.add(mMyselfFragment);        //ViewPager设置适配器        viewPager.setAdapter(new MainFragmentAdapter(getSupportFragmentManager(),alFragment));        //ViewPager显示第一个Fragment        viewPager.setCurrentItem(0);        //ViewPager页面切换监听        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            @Override            public void onPageSelected(int position) {                switch (position) {                    case 0:                        radioGroup.check(R.id.rb_home);                        break;                    case 1:                        radioGroup.check(R.id.rb_healthdata);                        break;                    case 2:                        radioGroup.check(R.id.rb_illmanagement);                        break;                    case 3:                        radioGroup.check(R.id.rb_myself);                        break;                }            }            @Override            public void onPageScrollStateChanged(int state) {            }        });    }}

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