首先，我将 Android 兼容性库 V4 rev.3 用于我的 1.6( donut )

当您第一次创建 ListFragment 时，它会显示一个不确定的进度指示器，直到您使用 setListAdabpter()。根据 ListFragment.onCreateView 的文档，如果我想使用自定义布局:

If you are overriding this method with your own custom content, consider including the standard layout {@link android.R.layout#list_content} in your layout file, so that you continue to retain all of the standard behavior of ListFragment. In particular, this is currently the only way to have the built-in indeterminant progress state be shown.

问题是当我进入我的布局文件并尝试: <include layout="@android:layout/list_content" ...>它( eclipse )告诉我

Resource is not public. (at 'layout' with value '@android:layout/list_content').

我认为这意味着 list_content.xml在我的 V4 源代码中不存在。这是正确的，因为根据 API v11 中出现的文档。

我只是假设它会存在于兼容性库源中，不知道它是否存在......

我能看到的唯一其他解决方案是挖掘 android 的 API V11 源代码并复制和粘贴 list_content.xml .但是现在我想避免这种黑客行为。这是唯一的解决方案吗？

最佳答案

兼容性库中包含的 ListFragment 似乎不像真正的那样使用该布局 (list_content)。这可能是因为它是作为 jar 提供的，并且无法打包资源。下面是它的onCreateView的内容:

来自兼容性库的ListFragment:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    final Context context = getActivity();

    FrameLayout root = new FrameLayout(context);

    // ------------------------------------------------------------------

    LinearLayout pframe = new LinearLayout(context);
    pframe.setId(INTERNAL_PROGRESS_CONTAINER_ID);
    pframe.setOrientation(LinearLayout.VERTICAL);
    pframe.setVisibility(View.GONE);
    pframe.setGravity(Gravity.CENTER);

    ProgressBar progress = new ProgressBar(context, null,
            android.R.attr.progressBarStyleLarge);
    pframe.addView(progress, new FrameLayout.LayoutParams(
            ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));

    root.addView(pframe, new FrameLayout.LayoutParams(
            ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));

    // ------------------------------------------------------------------

    FrameLayout lframe = new FrameLayout(context);
    lframe.setId(INTERNAL_LIST_CONTAINER_ID);

    TextView tv = new TextView(getActivity());
    tv.setId(INTERNAL_EMPTY_ID);
    tv.setGravity(Gravity.CENTER);
    lframe.addView(tv, new FrameLayout.LayoutParams(
            ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));

    ListView lv = new ListView(getActivity());
    lv.setId(android.R.id.list);
    lv.setDrawSelectorOnTop(false);
    lframe.addView(lv, new FrameLayout.LayoutParams(
            ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));

    root.addView(lframe, new FrameLayout.LayoutParams(
            ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));

    // ------------------------------------------------------------------

    root.setLayoutParams(new FrameLayout.LayoutParams(
            ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));

    return root;
}

Android 4.0 的 ListFragment:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return inflater.inflate(com.android.internal.R.layout.list_content, container, false);
}

考虑到从 APIv11 源代码复制布局文件和包含此 View 初始化代码之间的选择，我认为很清楚哪个会被视为“黑客”；)

关于android - 将 list_content 包含到列表布局中以保留 ListFragment 功能，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7863074/