当我将选项卡添加到操作栏时，滚动视图停止工作答案

【问题标题】：Scrollview stopped working when I added tabs to the actionbar当我将选项卡添加到操作栏时，滚动视图停止工作
【发布时间】：2013-12-10 22:57:49
【问题描述】：

背景：我为 Android 4 (SDK 15) 开发并使用本机操作栏。在我的一项活动中，我有一个以滚动视图作为根元素的片段。片段填充内容。我没有为活动设置布局，我只添加片段。一切正常。

问题：当我将标签添加到操作栏时，滚动视图不再起作用。当我点击屏幕时会显示滚动条，但没有滚动。

我有第二个标签的第二个片段。它是一个 WebView，可以完美滚动。

有没有人经历过或者有任何想法？

标签是用这个代码添加的：

    final ActionBar actionBar = getActionBar();

    actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP
            | ActionBar.DISPLAY_SHOW_HOME | ActionBar.DISPLAY_SHOW_CUSTOM);
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    // Set the name of the current entity as the title of the action bar.
    final TextView textView = (TextView) getLayoutInflater().inflate(
            R.layout.action_bar_text_view, null);
    textView.setText(getGuideContext().getSelectedEntity().getName(
            getGuidePreferences().getNameLang()));
    actionBar.setCustomView(textView);

    // Show the actionbar now that the text view is set up.
    actionBar.show();

    // Set the tabs.
    final Entity entity = getGuideContext().getSelectedEntity();

    final DetailsTabListener factsListener = new DetailsTabListener(
            DetailsMode.FACTS, entity, details);
    actionBar.addTab(actionBar.newTab()
            .setText(getString(R.string.details_tab_facts))
            .setTabListener(factsListener));

    final DetailsTabListener webListener = new DetailsTabListener(
            DetailsMode.WEB, entity, details);
    actionBar.addTab(actionBar.newTab()
            .setText(getString(R.string.details_tab_web))
            .setTabListener(webListener));

这是 DetailsTabListener：

public class DetailsTabListener implements TabListener {

/** The current details mode. */
private final DetailsMode detailsMode;

/** A reference to the details of the current entity. */
private final WeakReference<Details> detailsRef;

/** A reference to the current entity. */
private final WeakReference<Entity> entityRef;

/** Holds a reference to the fragment this listener last created. */
private WeakReference<Fragment> fragmentRef;

/**
 * The constructor.
 * 
 * @param detailsMode
 *            the current details mode, i.e. the type of fragment this
 *            listener is listening to, must not be null
 * @param entity
 *            the currently selected entity, must not be null
 * @param details
 *            details for the current entity, must not be null
 */
public DetailsTabListener(final DetailsMode detailsMode,
        final Entity entity, final Details details) {

    if ((detailsMode == null) || (entity == null) || (details == null)) {
        throw new IllegalArgumentException(
                "None of the parameters detailsMode, entity or details can be null.");
    }

    this.detailsMode = detailsMode;
    this.entityRef = new WeakReference<Entity>(entity);
    this.detailsRef = new WeakReference<Details>(details);
}

/** {@inheritDoc} */
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {

    if (fragmentRef == null) {
        return;
    }

    // Scroll to top.
    final Fragment fragment = fragmentRef.get();
    if (fragment instanceof ScrollToTopInterface) {
        ((ScrollToTopInterface) fragment).scrollToTop();
    }
}

/** {@inheritDoc} */
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {

    // Sets a fragment that was created earlier if there is one.
    Fragment fragment = null;
    if (fragmentRef != null) {
        fragment = fragmentRef.get();
    }

    // Creates and adds a new fragment if there is none, or attach the old
    // one if it exists.
    if (fragment == null) {
        fragment = DetailsFragmentFactory.createFragment(detailsMode,
                entityRef.get(), detailsRef.get());
        fragmentRef = new WeakReference<Fragment>(fragment);
        ft.add(android.R.id.content, fragment, "");
    } else {
        ft.attach(fragment);
    }
}

/** {@inheritDoc} */
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {

    // Detach the fragment if there is one.
    if (fragmentRef != null) {
        ft.detach(fragmentRef.get());
    }
}

}

这是片段的布局：

<ScrollView 
android:id="@+id/details_facts_scroll_view"
android:layout_height="match_parent" 
android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"    
>

<LinearLayout
    android:layout_height="wrap_content"
    android:layout_marginBottom="@dimen/details_facts_margin_top_bottom"
    android:layout_marginTop="@dimen/details_facts_margin_top_bottom"       
    android:layout_width="match_parent"
    android:orientation="vertical"
    >

    <LinearLayout
        android:baselineAligned="false"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/details_facts_header_margin_top"
        android:layout_width="match_parent"
        android:orientation="horizontal"
        >

        <TextView
            android:layout_weight="0.5"
            android:text="@string/details_length"
            style="@style/details_fact_header"
        />

        <TextView
            android:layout_weight="0.5"                 
            android:text="@string/details_weight"
            style="@style/details_fact_header"
        />

    </LinearLayout>

    <LinearLayout
        android:baselineAligned="false"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:orientation="horizontal"
        >

        <TextView
            android:id="@+id/details_length"
            android:layout_weight="0.5"
            style="@style/details_fact"
        />

        <TextView
            android:id="@+id/details_weight"
            android:layout_weight="0.5"                 
            style="@style/details_fact"
        />

    </LinearLayout>

    <LinearLayout
        android:baselineAligned="false"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/details_facts_header_margin_top"
        android:layout_width="match_parent"
        android:orientation="horizontal"
        >

        <TextView
            android:layout_weight="0.5"                 
            android:text="@string/details_wingspan"
            style="@style/details_fact_header"
        />

        <TextView
            android:layout_weight="0.5"        
            android:text="@string/details_age"
            style="@style/details_fact_header"
        />

    </LinearLayout>

   <LinearLayout
        android:baselineAligned="false"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:orientation="horizontal"
        >         

        <TextView
            android:id="@+id/details_wingspan"
            android:layout_weight="0.5"                 
            style="@style/details_fact"
        />

        <TextView
            android:id="@+id/details_age"
            android:layout_weight="0.5"        
            style="@style/details_fact"
        />

    </LinearLayout>

    <TextView
        android:id="@+id/details_photograph_section_header"
        android:text="@string/details_photograph_section_header"
        style="@style/details_fact_section_header"
    />

    <View
        android:id="@+id/details_photograph_section_divider"
        style="@style/divider"
    />

    <ImageView
        android:contentDescription="@string/details_image_content_description"
        android:id="@+id/details_image"
        android:layout_height="wrap_content"
        android:layout_marginRight="@dimen/details_facts_margin_left_right"
        android:layout_width="wrap_content"
    />

    <TextView
        android:id="@+id/details_image_text"
        style="@style/details_image_text"
    />


    <TextView
        android:text="@string/details_taxonomy_section_header"
        style="@style/details_fact_section_header"
    />

    <View
        style="@style/divider"
    />

    <TextView
        android:layout_marginTop="@dimen/details_facts_header_margin_top"
        android:text="@string/details_english"
        style="@style/details_fact_header"
    />

    <TextView
        android:id="@+id/details_taxonomy_english"
        style="@style/details_fact"
    />

    <TextView
        android:layout_marginTop="@dimen/details_facts_header_margin_top"       
        android:text="@string/details_latin"
        style="@style/details_fact_header"
    />

    <TextView
        android:id="@+id/details_taxonomy_latin"
        style="@style/details_fact"
    />

    <TextView
        android:layout_marginTop="@dimen/details_facts_header_margin_top"       
        android:text="@string/details_swedish"
        style="@style/details_fact_header"
    />

    <TextView
        android:id="@+id/details_taxonomy_swedish"
        style="@style/details_fact"
    />

</LinearLayout>

【问题讨论】：

如果您需要任何帮助，您需要发布一些代码。
感谢您的提示！我添加了一些代码。很难知道什么是有趣的。你有什么想念的吗？
您是否要在 tabhost 中设置滚动视图？
不，我正在使用操作栏中的选项卡，并且在添加到活动内容的片段中有一个滚动视图。我已经添加了将片段添加到内容的代码示例。
当我添加第二个包含 Web 视图的片段时，它会完美滚动。我已经用更多信息更新了这个问题。

标签： android tabs android-actionbar android-scrollview

【解决方案1】：

我现在已经解决了这个问题。

滚动视图似乎不知道选项卡，因此认为布局适合并且不需要滚动。如果我在布局底部添加更多视图，我可以再次滚动。或者，如果我删除了滚动工作的标签（如问题中所述）。

我的解决方法是在布局底部添加一个大空间视图。但是，如果有人知道为什么滚动视图会以这种方式运行，我仍然很感兴趣。我感觉这个问题有更优雅的解决方案。

【讨论】：