我在设计支持库23.0.1上,我正在使用带有视差图像的折叠工具栏布局.我不明白为什么当工具栏完全折叠(固定)时,如果单击一个操作按钮(特别是我刷新其图像),标题就会消失.之后,如果我将标题下拉到总扩展并重新点击操作按钮,标题将返回.

活动布局

@H_502_4@<!-- App bar --> <android.support.design.widget.AppBarLayout android:id="@+id/app_bar" android:layout_width="match_parent" android:layout_height="150dp" android:fitsSystemWindows="true" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> <!-- Collapsing toolbar layout --> <android.support.design.widget.CollapsingToolbarLayout android:id="@+id/collapsing_toolbar" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" app:contentScrim="?attr/colorPrimary" app:expandedTitleMarginBottom="32dp" app:expandedTitleMarginEnd="64dp" app:expandedTitleMarginStart="48dp" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <!-- Image Parallax --> <ImageView android:id="@+id/header" android:layout_width="match_parent" android:layout_height="match_parent" android:adjustViewBounds="true" android:contentDescription="" android:fitsSystemWindows="true" android:scaleType="centerCrop" edo:layout_collapseMode="parallax" /> <!-- Toolbar --> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin" edo:popupTheme="@style/ThemeOverlay.AppCompat.Light"> </android.support.v7.widget.Toolbar> </android.support.design.widget.CollapsingToolbarLayout> </android.support.design.widget.AppBarLayout> <!-- Nested scroll view --> <android.support.v4.widget.NestedScrollView android:id="@+id/nested_scroll_view" android:layout_width="match_parent" android:layout_height="match_parent" edo:layout_behavior="@string/appbar_scrolling_view_behavior"> </android.support.v4.widget.NestedScrollView>

动作菜单布局

@H_502_4@<item android:id="@+id/action_bookmark" android:icon="@mipmap/bookmark_empty_white" android:title="@string/add_news_to_bookmarks" app:showAsAction="ifRoom" />

选择的选项

@H_502_4@@Override public boolean onOptionsItemSelected(MenuItem item) { if (news != null) { switch (item.getItemId()) { case R.id.action_bookmark: if (Utils.isNetworkAvailable(activity)) { if (news.getBookmarked()) { bookmarked = false; item.setIcon(R.mipmap.bookmark_empty_white); deleteBookmark(); } else { bookmarked = true; item.setIcon(R.mipmap.bookmark_white); postBookmark(); } } else { handleError(Config.API_ERR_CONNECTION); } return true; } } return super.onOptionsItemSelected(item); }