android ViewPager + TabLayout 使用，并且解决 子fragmeng页面数据刷新问题

xml:

<android.support.design.widget.TabLayout
    android:id="@+id/tabLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabIndicatorColor="#666666"
    app:tabSelectedTextColor="@color/es_r"
    app:tabTextColor="@color/font_dark" />

<android.support.v4.view.ViewPager
    android:id="@+id/viewpager"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

java中使用

private void initView() {
    mTabLayout.addTab(mTabLayout.newTab() );
    mTabLayout.addTab(mTabLayout.newTab());
    mTabLayout.addTab(mTabLayout.newTab() );
    ArrayList<Fragment> list = new ArrayList<>();



    list.add(new MyNoticeFragment());
    list.add(myReportFragment);
    list.add(new MyRecordFragment());
    mAdapter = new MainPagerAdapter(getSupportFragmentManager(),list);

    mViewPager.setAdapter(mAdapter);
    //官方推荐的绑定ViewPager方式
    mTabLayout.setupWithViewPager(mViewPager);
    //手动  添加标题  必须在 setupwidthViewPager  之后  否则不行
    mTabLayout.getTabAt(0).setText("通知");
    mTabLayout.getTabAt(1).setText("我的上报");
    mTabLayout.getTabAt(2).setText("我的");


    //
}

 

解决数据刷新的 baseadapter

public abstract class BaseFragmentPagerAdapter extends FragmentPagerAdapter {

    private FragmentManager mFragmentManager;
    private List<String> tagList = new ArrayList<String>();

    public BaseFragmentPagerAdapter(FragmentManager fm) {
        super(fm);
        this.mFragmentManager = fm;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        tagList.add(makeFragmentName(container.getId(), getItemId(position)));
        return super.instantiateItem(container, position);
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object){
        super.destroyItem(container, position, object);
        tagList.remove(makeFragmentName(container.getId(), getItemId(position)));
    }

    private static String makeFragmentName(int viewId, long id) {
        return "android:switcher:" + viewId + ":" + id;
    }

    public void update(int position){
        Fragment fragment = (Fragment)mFragmentManager.findFragmentByTag(tagList.get(position));
        if(fragment == null){
            return;
        }
        if(fragment instanceof UpdateAble){//这里唯一的要求是Fragment要实现UpdateAble接口
            ((UpdateAble)fragment).update();
        }
    }

    public interface UpdateAble {
        public void update();
    }
}

 

使用 adapter

//ViewPager适配器  10个Fragment
private class MainPagerAdapter extends BaseFragmentPagerAdapter {
    ArrayList<Fragment> mList;
    public MainPagerAdapter(FragmentManager fm,  ArrayList<Fragment> list) {
        super(fm);
        mList =  list;
    }

    @Override
    public Fragment getItem(int position) {
        return mList.get(position);
    }

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

子页面fragmeng 继承刷新接口

public class MyReportFragment extends Fragment implements BaseFragmentPagerAdapter.UpdateAble{

initOffLineData();

}