Android解决ViewPager嵌套ViewPager中多层Fragment子ViewPager中加载不出来Fragment
16lz
2021-01-24
Android中ViewPager嵌套ViewPager
- 先看代码：
- 这一步处理最重要的是MyPagerAdapter构造方法中不能传入getActivity().getSupportFragmentManager()
- 原因如下：
最近UI重新设计了一个店铺首页的效果，要用到ViewPager嵌套ViewPager才能实现效果，可是在子ViewPager中出现了加载不出来Fragment,由于里面用了多层的Fragment。
老规矩，先看效果图，没图说个j8。
先看代码：
首页代码：
第一层布局代码：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginTop="-4dp" android:background="@drawable/ic_shop_bg2" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="28dp" android:layout_marginLeft="@dimen/text_layout_15_dp" android:layout_marginRight="@dimen/text_layout_15_dp" android:layout_marginTop="25dp" android:gravity="center_vertical" android:orientation="horizontal"> <TextView android:id="@+id/tv_shop_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="ShopName" android:textColor="@color/white" android:textSize="@dimen/text_size_16sp" android:textStyle="bold" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_gravity="right" android:gravity="center_vertical" android:orientation="horizontal"> <Button android:id="@+id/bt_shop_is_coll" android:layout_width="61dp" android:layout_height="28dp" android:layout_marginRight="@dimen/text_layout_12_dp" android:background="@drawable/ic_shop_text_bg" android:text="已关注" android:textColor="@color/white" android:textSize="@dimen/text_size_13_sp" /> <LinearLayout android:layout_width="75dp" android:layout_height="28dp" android:background="@drawable/ic_shop_text_bg" android:gravity="center" android:orientation="horizontal"> <TextView android:id="@+id/tv_shop_other" android:layout_width="wrap_content" android:layout_height="match_parent" android:gravity="center_vertical" android:paddingLeft="@dimen/text_layout_5_dp" android:paddingRight="@dimen/text_layout_10_dp" android:text="···" android:textColor="@color/white" android:textSize="@dimen/text_size_20_sp" /> <View android:layout_width="1dp" android:layout_height="match_parent" android:layout_marginBottom="@dimen/text_layout_5_dp" android:layout_marginTop="@dimen/text_layout_5_dp" android:background="@color/white" android:gravity="center_vertical" /> <ImageView android:id="@+id/iv_shop_exit" android:layout_width="wrap_content" android:layout_height="match_parent" android:gravity="center_vertical" android:paddingLeft="@dimen/text_layout_10_dp" android:paddingRight="@dimen/text_layout_5_dp" android:src="@drawable/ic_shop_exit" android:textSize="@dimen/text_size_15_sp" /> </LinearLayout> </LinearLayout> </LinearLayout> <com.jkgl.view.NoSlideViewPager android:id="@+id/viewPager" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:layout_marginTop="@dimen/text_layout_5_dp" /> <LinearLayout android:layout_width="match_parent" android:layout_height="@dimen/text_layout_50_dp" android:orientation="horizontal" android:gravity="center_vertical" android:background="@color/white" android:paddingLeft="@dimen/text_layout_15_dp" android:paddingRight="@dimen/text_layout_15_dp" > <RelativeLayout android:id="@+id/rl_shop_home" android:layout_width="0dp" android:layout_weight="1" android:layout_height="match_parent" android:gravity="center" > <ImageView android:id="@+id/iv_shop_logo" android:layout_width="41dp" android:layout_height="41dp" android:src="@drawable/logo1" android:visibility="visible" /> <TextView android:id="@+id/tv_shop_home" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="首页" android:textColor="@color/tv333" android:textSize="@dimen/text_size_10_sp" android:drawableTop="@drawable/ic_shop_home" android:drawablePadding="@dimen/text_layout_5_dp" android:layout_centerInParent="true" android:gravity="center" android:visibility="gone" /> </RelativeLayout> <LinearLayout android:layout_width="0dp" android:layout_weight="1" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > <TextView android:id="@+id/tv_all_goods" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="全部宝贝" android:textColor="@color/tv333" android:textSize="@dimen/text_size_10_sp" android:drawableTop="@drawable/ic_shop_all" android:drawablePadding="@dimen/text_layout_5_dp" /> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_weight="1" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > <TextView android:id="@+id/tv_shop_goods_classify" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="宝贝分类" android:textColor="@color/tv333" android:textSize="@dimen/text_size_10_sp" android:drawableTop="@drawable/ic_shop_classify" android:drawablePadding="@dimen/text_layout_5_dp" /> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_weight="1" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > <TextView android:id="@+id/tv_shop_service" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="联系客服" android:textColor="@color/tv333" android:textSize="@dimen/text_size_10_sp" android:drawableTop="@drawable/ic_shop_service" android:drawablePadding="@dimen/text_layout_5_dp" /> </LinearLayout> </LinearLayout></LinearLayout>第一层逻辑代码
/** * 店铺首页 */public class ShopActivity extends FastBaseActivity { @InjectView(R.id.tv_shop_name) TextView tv_shop_name; @InjectView(R.id.tv_shop_other) TextView tv_shop_other;//三个点 @InjectView(R.id.bt_shop_is_coll) Button bt_shop_is_coll;//是否关注 @InjectView(R.id.iv_shop_exit) ImageView iv_shop_exit;//退出 @InjectView(R.id.viewPager) NoSlideViewPager viewPager; @InjectView(R.id.rl_shop_home) RelativeLayout rl_shop_home; @InjectView(R.id.iv_shop_logo) ImageView iv_shop_logo; @InjectView(R.id.tv_shop_home) TextView tv_shop_home; @InjectView(R.id.tv_all_goods) TextView tv_all_goods; @InjectView(R.id.tv_shop_goods_classify) TextView tv_shop_goods_classify; @InjectView(R.id.tv_shop_service) TextView tv_shop_service; private List<Fragment> fragmentList; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_shop); ButterKnife.inject(this); initView(); } private void initView() { fragmentList = new ArrayList<>(); fragmentList.add(ShopHomeFragment.getInstance()); fragmentList.add(AllGoodsFragment.getInstance()); fragmentList.add(GoodsClassifyFragment.getInstance()); MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager()); viewPager.setAdapter(adapter); viewPager.setOffscreenPageLimit(3); } @OnClick({R.id.iv_shop_exit,R.id.rl_shop_home,R.id.tv_all_goods,R.id.tv_shop_goods_classify,R.id.tv_shop_service}) public void onClick(View view) { Drawable drawableTopAllNormal = getResources().getDrawable(R.drawable.ic_shop_all); Drawable drawableTopAllSelect = getResources().getDrawable(R.drawable.ic_shop_all_select); Drawable drawableTopClassifyNormal = getResources().getDrawable(R.drawable.ic_shop_classify); Drawable drawableTopClassifySelect = getResources().getDrawable(R.drawable.ic_shop_classify_select); switch (view.getId()) { case R.id.iv_shop_exit: finish(); break; case R.id.rl_shop_home: iv_shop_logo.setVisibility(View.VISIBLE); tv_shop_home.setVisibility(View.GONE); tv_all_goods.setTextColor(getResources().getColor(R.color.tv333)); tv_shop_goods_classify.setTextColor(getResources().getColor(R.color.tv333)); tv_all_goods.setCompoundDrawablesWithIntrinsicBounds(null,drawableTopAllNormal,null,null); tv_shop_goods_classify.setCompoundDrawablesWithIntrinsicBounds(null,drawableTopClassifyNormal,null,null); viewPager.setCurrentItem(0,false); break; case R.id.tv_all_goods: tv_all_goods.setCompoundDrawablesWithIntrinsicBounds(null,drawableTopAllSelect,null,null); tv_shop_goods_classify.setCompoundDrawablesWithIntrinsicBounds(null,drawableTopClassifyNormal,null,null); tv_all_goods.setTextColor(getResources().getColor(R.color.zhutihuang)); tv_shop_goods_classify.setTextColor(getResources().getColor(R.color.tv333)); iv_shop_logo.setVisibility(View.GONE); tv_shop_home.setVisibility(View.VISIBLE); viewPager.setCurrentItem(1,false); break; case R.id.tv_shop_goods_classify: tv_all_goods.setCompoundDrawablesWithIntrinsicBounds(null,drawableTopAllNormal,null,null); tv_shop_goods_classify.setCompoundDrawablesWithIntrinsicBounds(null,drawableTopClassifySelect,null,null); tv_all_goods.setTextColor(getResources().getColor(R.color.tv333)); tv_shop_goods_classify.setTextColor(getResources().getColor(R.color.zhutihuang)); iv_shop_logo.setVisibility(View.GONE); tv_shop_home.setVisibility(View.VISIBLE); viewPager.setCurrentItem(2,false); break; case R.id.tv_shop_service: String kefu2 = "KEFU154277063782440"; /** * 启动客户服聊天界面。 * * @param context 应用上下文。 * @param customerServiceId 要与之聊天的客服 Id。 * @param title 聊天的标题，如果传入空值，则默认显示与之聊天的客服名称。 * @param customServiceInfo 当前使用客服者的用户信息。{@link CSCustomServiceInfo} */ RongIM.getInstance().startCustomerServiceChat(this, kefu2, "在线客服",null); break; } } private class MyPagerAdapter extends FragmentPagerAdapter{ public MyPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { return fragmentList.get(position); } @Override public int getCount() { return fragmentList.size(); } }}我第一层的viewpager为了防止子View中的滑动冲突，做了一个处理，禁止滑动ViewPager
/** * 禁止左右滑动viewpager * Created by Administrator on 2018/12/10. */public class NoSlideViewPager extends ViewPager { //是否可以进行滑动 private boolean isSlide = false; public void setSlide(boolean slide) { isSlide = slide; } public NoSlideViewPager(Context context) { super(context); } public NoSlideViewPager(Context context, AttributeSet attrs) { super(context, attrs); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { return isSlide; } @Override public boolean onTouchEvent(MotionEvent ev) { return false; }}第二层布局文件
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="vertical" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:gravity="center_vertical" android:layout_gravity="bottom" android:layout_marginLeft="@dimen/text_layout_15_dp" android:layout_marginRight="@dimen/text_layout_15_dp" android:layout_marginTop="@dimen/text_layout_20_dp" > <LinearLayout android:id="@+id/ll_shop_search" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/ic_shop_search_bg" android:orientation="horizontal" android:gravity="center" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_shop_search" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="搜索" android:textSize="@dimen/text_size_14_sp" android:textColor="@color/white" /> </LinearLayout> <android.support.design.widget.TabLayout android:id="@+id/tab_shop" android:layout_width="wrap_content" android:layout_height="wrap_content" app:tabIndicatorColor="@color/white" app:tabSelectedTextColor="@color/white" app:tabMode="fixed" app:tabTextColor="@color/white" style="@style/tabSize" android:layout_marginLeft="24dp" android:paddingBottom="@dimen/text_layout_5_dp" /> </LinearLayout> <android.support.v4.view.ViewPager android:id="@+id/viewPager" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginTop="@dimen/text_layout_5_dp" > </android.support.v4.view.ViewPager></LinearLayout>代码
/** * 店铺首页 * Created by Administrator on 2018/12/13. */public class ShopHomeFragment extends Fragment { LinearLayout ll_shop_search;//搜索 TabLayout tab_shop; ViewPager viewPager; private String[] title = {"首页","宝贝","新品"}; private List<Fragment> fragmentList; static ShopHomeFragment fragment; public static ShopHomeFragment getInstance(){ if(fragment == null){ fragment = new ShopHomeFragment(); } return fragment; } @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_shop_home,null); initView(view); initListener(); return view; } private void initListener() { ll_shop_search.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { ToastUtil.showToast("搜索"); } }); } private void initView(View view) { ll_shop_search = view.findViewById(R.id.ll_shop_search); tab_shop = view.findViewById(R.id.tab_shop); viewPager = view.findViewById(R.id.viewPager); fragmentList = new ArrayList<>(); fragmentList.add(new ShopHomeAllFragment()); fragmentList.add(new ShopHomeGoodsFragment()); fragmentList.add(new ShopHomeNewGoodsFragment()); MyPagerAdapter adapter = new MyPagerAdapter(getChildFragmentManager()); viewPager.setAdapter(adapter); tab_shop.setupWithViewPager(viewPager); viewPager.setOffscreenPageLimit(3); } private class MyPagerAdapter extends FragmentPagerAdapter { public MyPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { return fragmentList.get(position); } @Override public int getCount() { return fragmentList.size(); } @Nullable @Override public CharSequence getPageTitle(int position) { return title[position]; } }}这一步处理最重要的是MyPagerAdapter构造方法中不能传入getActivity().getSupportFragmentManager()
MyPagerAdapter adapter = new MyPagerAdapter(getChildFragmentManager());原因如下：
Activity的Fragment要使用FragmentManager（），
而在Fragment中动态的添加Fragment要使用getChildFragmetManager（）来管理。
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