TextView setText 和 setVisibility 在片段中不起作用

Question

我有 ControllerFragment，其中有 3 个子片段。通过 ViewPager 在 tabLayout 中提供子片段更改。未发送的 Apple 和 Banana 徽章计数是可计算的变量值。 unSendAppleCountTxtView 和 unSendBananaCountTxtView 根据这些变量值进行更改。

我的功能是运行主线程。

尝试过的方法：

我已经控制了 null 检查并且 textView 不为 null
setUnSendAppleCount函数在这些线程中被采用（runOnUIThread, new Handler(), new Handler(Looper.getMainLooper())）
我已经尝试 AsyncTask 但在 postExecute 中也无法使用 setView 和 setText。
最后我扫描了所有相关问题并尝试了。

所有方法均无效。 TextView 为空值。

public class ControllerFragment extends Fragment {

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup viewGroup, Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.controller_fragment, viewGroup, false);

        tabs = ViewUtil.findById(rootView, R.id.tabs);
        viewPager = ViewUtil.findById(rootView, R.id.controllerViewPager);

        setFragments();
        setupViewPager(viewPager);
        tabs.setupWithViewPager(viewPager);

        setupTabIcons(viewGroup);

        return rootView;
      }

       private void setupTabIcons(ViewGroup viewGroup) {

        LinearLayout appleListTab = (LinearLayout) LayoutInflater.from(MyApplication.getContext()).inflate(R.layout.tab_title_text_and_badge, viewGroup, false);
        RelativeLayout pearListTab = (RelativeLayout) LayoutInflater.from(MyApplication.getContext()).inflate(R.layout.tab_title_text, viewGroup, false);
        LinearLayout bananaListTab = (LinearLayout) LayoutInflater.from(MyApplication.getContext()).inflate(R.layout.tab_title_text_and_badge, viewGroup, false);

        unSendAppleCountTxtView = appleListTab.findViewById(R.id.badgeView);
        unSendBananaCountTxtView = bananaListTab.findViewById(R.id.badgeView);

        TextView appleTextView = appleListTab.findViewById(R.id.textView);
        TextView pearTextView = pearListTab.findViewById(R.id.textView);
        TextView bananaTextView = bananaListTab.findViewById(R.id.textView);

        setUnSendAppleCount(2);  //....this function is not working
        setUnSendBananaCount(2); //.....this function is not working

        bananaTextView.setText(getString(R.string.bananas));
        tabs.getTabAt(0).setCustomView(bananaListTab);

        appleTextView.setText(getString(R.string.apples));
        tabs.getTabAt(1).setCustomView(appleListTab);

        pearTextView.setText(getString(R.string.pears));
        tabs.getTabAt(2).setCustomView(pearListTab);
    }

    private void setupViewPager(ViewPager viewPager) {

        TabsViewPagerAdapter adapter = new TabsViewPagerAdapter(getFragmentManager());
        adapter.addFrag(bananaFragment, getString(R.string.bananas));
        adapter.addFrag(appleFragment, getString(R.string.apples));
        adapter.addFrag(pearFragment, getString(R.string.pears));
        viewPager.setAdapter(adapter);

        viewPager.setCurrentItem(1);
    }

    private void setUnSendAppleCount(int unSendCount) {

        if (unSendAppleCountTxtView != null) {

         if (unSendCount > 0) {

         unSendAppleCountTxtView.setVisibility(View.VISIBLE);
         unSendAppleCountTxtView.setText(String.format(getMyLocale(), "%d", unSendCount));

         } else {
         unSendAppleCountTxtView.setVisibility(View.GONE);
         }
      }
   }
}

controller_fragment xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/tab_unpressed_color">

            <android.support.design.widget.TabLayout
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:tabGravity="fill"
                app:tabMode="fixed"
                app:tabSelectedTextColor="@color/white"
                app:tabTextColor="@color/tabColor" />

        </FrameLayout>

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/controllerViewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/app_bar_layout" />

</RelativeLayout>

tab_title_text_and_badge.xml

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:gravity="center"
    android:weightSum="2"
    android:orientation="horizontal"
    tools:background="@color/Black">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ellipsize="end"
        android:gravity="center"
        android:layout_gravity="center"
        android:maxLines="1"
        android:layout_weight="1.99"
        android:textColor="@color/white"
        android:textSize="@dimen/infoTitle"/>

    <TextView
        android:id="@+id/badgeView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="start|center"
        android:layout_marginEnd="1dp"
        android:layout_marginRight="1dp"
        android:layout_weight="0.01"
        android:background="@drawable/tab_controller_badge"
        android:gravity="center"
        android:textColor="@color/white"
        android:textSize="@dimen/miniTextSize"
        android:visibility="gone"
        tools:text="11"
        tools:visibility="visible" />

</LinearLayout>

请帮帮我

Answer 1

尝试设置可见性 android:visibility="visible" 或 android:visibility="invisible" 删除 gone 属性以删除 TextView。

<TextView
    android:id="@+id/badgeView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="start|center"
    android:layout_marginEnd="1dp"
    android:layout_marginRight="1dp"
    android:layout_weight="0.01"
    android:background="@drawable/tab_controller_badge"
    android:gravity="center"
    android:textColor="@color/white"
    android:textSize="@dimen/miniTextSize"
    android:visibility="visible" //change here
    tools:text="11"
    tools:visibility="visible" />

Answer 2

请使用android:text代替tools:text

tools:text="text" 仅用于 Android Studio 布局预览（在运行应用程序时不可见）
android:text="text" 用于将文本设置为布局元素，在应用程序时可以看到运行

Answer 3

尝试使用下面的 xml,

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:gravity="center"
    android:weightSum="2"
    android:orientation="horizontal"
    android:background="@color/Black">

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ellipsize="end"
    android:gravity="center"
    android:layout_gravity="center"
    android:maxLines="1"
    android:layout_weight="1.99"
    android:textColor="@color/white"
    android:textSize="@dimen/infoTitle"/>

<TextView
    android:id="@+id/badgeView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="start|center"
    android:layout_marginEnd="1dp"
    android:layout_marginRight="1dp"
    android:layout_weight="0.01"
    android:background="@drawable/tab_controller_badge"
    android:gravity="center"
    android:textColor="@color/white"
    android:textSize="@dimen/miniTextSize"
    android:text="11"/>
</LinearLayout>

希望对您有所帮助！

Answer 4

我猜是不同线程的问题。我已经尝试使用 eventBus activity 将数据传递给片段并解决了。

  ControllerFragment(){

        @Override
        public void onStart() {
            super.onStart();

            if (!EventBus.getDefault().isRegistered(this)) EventBus.getDefault().register(this);

        }

    @Override
    public void onStop() {
        super.onStop();
        EventBus.getDefault().unregister(this);
    }

   @Subscribe(sticky = true, threadMode = ThreadMode.MAIN)
   public void onEventMain(ControllerEvent event) {

      if (event.getSelectedEventType() == ControllerEvent.tabControllerEventTypes.refreshCount.ordinal()) {

          setUnSendAppleCount(event.getAppleCount());

          }
      }
}

TextView setText 和 setVisibility 在片段中不起作用

TextView setText and setVisibility not working in fragment

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android-asynctask