小编Nic*_*nko的帖子

来自appcompat的CollapsingToolbarLayout在折叠状态下显示阴影,但在展开(或在展开过程中)阴影消失时

我的示例代码https://github.com/NaikSoftware/CollapsingToolbarWithImageAndTabs/tree/master/app

布局

<?xml version="1.0" encoding="utf-8"?>

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="ua.naiksoftware.hidetabs.MainActivity">

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.design.widget.CollapsingToolbarLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/toolbar_plus_tabs"
        app:contentScrim="@android:color/transparent"
        app:layout_scrollFlags="scroll|exitUntilCollapsed|snap|enterAlways"
        app:titleEnabled="false"
        app:toolbarId="@+id/toolbar_wrapper">

        <ImageView
            android:id="@+id/appbar_background"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            android:src="@drawable/header_back"
            app:layout_collapseMode="parallax"/>

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="top"
            android:background="@android:color/transparent"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar_wrapper"
            android:layout_width="match_parent"
            android:layout_gravity="bottom"
            android:background="@android:color/transparent"
            android:layout_height="wrap_content"
            android:minHeight="@dimen/tab_layout_height">

            <android.support.design.widget.TabLayout
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@android:color/transparent"
                app:tabGravity="fill"
                app:tabIndicatorColor="@android:color/white"
                app:tabMode="scrollable"
                app:tabSelectedTextColor="@android:color/white" />
        </android.support.v7.widget.Toolbar>

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

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

<android.support.v4.view.ViewPager
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<android.support.design.widget.FloatingActionButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_add_black_24dp"
    android:layout_margin="@dimen/fab_margin"
    android:tint="@android:color/white"
    android:layout_gravity="bottom|end"
    app:elevation="@dimen/fab_elevation"
    app:layout_behavior="ua.naiksoftware.hidetabs.FabSlidingBehavior"/>

倒塌

扩展

我正在使用带有RabbitMQ的Spring STOMP over Websocket.一切正常,但simpMessagingTemplate.convertAndSend工作很慢,调用可能需要2-10秒(同步,阻塞线程).可能是什么原因？

RabbitTemplate.convertAndSend取<1s,但我需要踩过websocket ..

UPDATE

我尝试使用ActiveMQ并获得相同的结果.convertAndSend需要2-10秒

ActiveMQ具有默认配置.

Web套接字配置:

@Configuration
@EnableWebSocket
@EnableWebSocketMessageBroker
class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

    @Override
    void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableStompBrokerRelay("/topic", "/queue", "/exchange");
        config.setApplicationDestinationPrefixes("/topic", "/queue"); // prefix in client queries
        config.setUserDestinationPrefix("/user");
    }

    @Override
    void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/board").withSockJS()
    }

    @Override
    void configureWebSocketTransport(WebSocketTransportRegistration registration) {
        registration.setMessageSizeLimit(8 * 1024);
    }
}

fun handle() : String {
    null?.let { return "Ololo"}
}

val result = handle()
result.trim() // kotlin.TypeCastException: null cannot be cast to non-null type kotlin.CharSequence

任何想法为什么null安全的Kotlin函数返回null？

我使用这种方法从Uri获取文件路径https://github.com/iPaulPro/aFileChooser/blob/master/aFileChooser/src/com/ipaulpro/afilechooser/utils/FileUtils.java#L257

但是当我传递Uri时会抛出异常("_data"列未找到),如下所示:

public static Uri uriFromFile(Context context, String path) {
    if (path == null) return null;
    return FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID + ".provider", new File(path));
}

我只需要在我的活动之间传递文件路径..