Question

我有一个ActionBarActivity（MainActivity），其中包含Toolbar，NavigationDrawer和FrameLayout作为我的片段的容器。

当我启动我的应用程序时，显示的第一个片段（ArticleOverview）将是可见的（旁注：片段是可见的但是即使调用了notifyDataSet也没有加载来自我的异步任务的数据，并且ListView仅获取条目，如果我触摸屏幕一次 - 很奇怪，但我不知道这是否与这个问题有关。）

如果我使用例如导航抽屉更改为另一个片段，则容器视图将保持为空。奇怪的是，如果应用程序将被最小化为多任务并再次打开（因此相同的片段加载）它完美地工作，我可以看到片段。所以这只发生在第一次启动时，而不是它在ram中。 onCreateView上的片段被执行，我不知道为什么它不可见

MainActivity

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:orientation="vertical">

    <android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/main_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?android:actionBarSize"
        style="@style/HeaderBar"
        android:theme="@style/ActionBarThemeOverlay" />

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/activity_background_gray" />
</LinearLayout>

<fragment
    android:id="@+id/navigation_drawer"
    android:name="com.danielbretzigheimer.reedly.app.view.fragments.NavigationDrawerFragment"
    android:layout_width="@dimen/navigation_drawer_width"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    tools:layout="@layout/fragment_navigation_drawer" />

MainActivity.java中的

方法显示文章概述

public void launchArticleOverview(String title, String streamId) {
    mTitle = getString(R.string.title_section_articles);
    mTitle = mTitle + " " + title;

    if (this.getToolbar() != null)
        this.getToolbar().setTitle(mTitle);

    ArticleOverviewFragment fragment = new ArticleOverviewFragment();
    fragment.initialize(streamId, "");
    fragment.initializeToolbar(getToolbar());
    mFragment = fragment;
    getSupportFragmentManager().beginTransaction()
            .replace(R.id.container, mFragment)
            .commit();
}

启动其他片段的导航抽屉侦听器

@Override
public void onNavigationDrawerItemSelected(int position) {
    if (mNavigationDrawerFragment == null)
        return;

    // update the main content by replacing fragments
    final FragmentManager fragmentManager = getSupportFragmentManager();

    if (position == 0) {
        mFragment = new ArticleOverviewFragment();
        ((ArticleOverviewFragment) mFragment).initialize("", "");
        mTitle = getString(R.string.title_section_articles);
    } else if (position == 1) {
        mFragment = new CategoriesFragment();
        mTitle = getString(R.string.title_section_categories);
    } else if (position == 3) {
        Intent intent = new Intent(this, SettingsActivity.class);
        startActivity(intent);
    } else if (position == 4) {
        mFragment = new HelpFragment();
        mTitle = getString(R.string.help);
    }

    if (this.getToolbar() != null)
        this.getToolbar().setTitle(mTitle);

    if (mFragment != null) {
        mFragment.initializeToolbar(getToolbar());
        fragmentManager.beginTransaction()
                .replace(R.id.container, mFragment)
                .commit();
    }
}

将为空白的片段示例

public class ProfileFragment extends ToolbarFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_profile, container, false);
    final TextView firstName = (TextView) rootView.findViewById(R.id.fragment_profile_first_name);
    final TextView lastName = (TextView) rootView.findViewById(R.id.fragment_profile_last_name);
    final TextView gender = (TextView) rootView.findViewById(R.id.fragment_profile_gender);
    final TextView locale = (TextView) rootView.findViewById(R.id.fragment_profile_locale);
    final TextView mail = (TextView) rootView.findViewById(R.id.fragment_profile_mail);
    final RoundedImageView image = (RoundedImageView) rootView.findViewById(R.id.fragment_profile_image);

    DataAccess.getInstance().getProfile(new ProfileRequest() {
        @Override
        public void onProfileRequestFinished(Profile profile)
        {
            firstName.setText(profile.getGivenName());
            lastName.setText(profile.getFamilyName());
            mail.setText(profile.getEmail());
            gender.setText(profile.getGender());
            locale.setText(profile.getLocale());

            AsyncTask<String, Void, Void> setProfilePicture = new AsyncTask<String, Void, Void>() {
                @Override
                protected Void doInBackground(String... params) {
                    try {
                        URL url = new URL(params[0]);
                        Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
                        image.setImageBitmap(bmp);
                    } catch (Exception exception) {
                        Log.w("com.danielbretzigheimer.readly.app.NavigationDrawerFragment", "Error loading Profile Image");
                    }
                    return null;
                }
            };

            setProfilePicture.execute(profile.getPicture());
        }

        @Override
        public void onProfileRequestFailed() {
        }
    });

    return rootView;
}

}

我已经尝试过使用androids Fragment而不是我的ToolbarFragment实现，但这也不行。

Android Activity容器未被替换

0 个答案: