如何使用工具栏

Question

我有以下列表视图，我想添加一个浮动操作按钮。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="@drawable/background_serious" >
    <include layout="@layout/toolbar"/>

    <ListView android:id="@id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:cacheColorHint="#00000000">
    </ListView>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/ic_done" />

</LinearLayout>

在当前表单中，根本不显示按钮。 我尝试将LinearLayout更改为CoordinatorLayout，因为很多示例都是如此。但后来我收到了一个错误：

java.lang.RuntimeException: Unable to start activity ComponentInfo{de.sudoq/de.sudoq.controller.menus.SudokuLoadingActivity}: android.view.InflateException: Binary XML file line #6: Error inflating class CoordinatorLayout
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
            ...
     Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class CoordinatorLayout
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:757)
            ...
     Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.CoordinatorLayout" on path: DexPathList[[zip file "/data/app/de.sudoq-2/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
            ...

我也trid FrameLayout但是然后列表越过工具栏（您可以在列表项的透明部分下看到工具栏，但它们覆盖工具栏，而不是相反）

Answer 1

尝试将ListView和FloatingActionButton放在FrameLayout

中

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical"
   android:background="@drawable/background_serious" >

      <include layout="@layout/toolbar"/>
  <FrameLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent">

          <ListView android:id="@id/android:list"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:cacheColorHint="#00000000">
          </ListView>

     <android.support.design.widget.FloatingActionButton
         android:id="@+id/fab"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="end|bottom"
         android:layout_margin="@dimen/fab_margin"
         android:src="@drawable/ic_done" />

  </FrameLayout>
</LinearLayout>

Answer 2

您需要使用from threading import Thread from Queue import Queue num_worker_threads = 2 def worker(): while True: item = q.get() do_work(item) q.task_done() q = Queue() for i in range(num_worker_threads): t = Thread(target=worker) t.daemon = True t.start() for item in source(): q.put(item) q.join() # block until all tasks are done 作为根布局而不是android.support.design.widget.CoordinatorLayout，然后才能使用LinearLayout

android.support.design.widget.FloatingActionButton

Answer 3

这对我有用：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".HomeFeedActivity">
<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@drawable/ic_action_add" />

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    xmlns:tools="http://schemas.android.com/tools"
    android:fitsSystemWindows="true"
    tools:context=".HomeFeedActivity">

    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:divider="@null" />

</LinearLayout>