使用 xamarin 表单删除 Android 上的顶部栏答案

【问题标题】：remove top bar on Android with xamarin forms使用 xamarin 表单删除 Android 上的顶部栏
【发布时间】：2017-06-11 17:08:43
【问题描述】：

我尝试了几种解决方案，包括：

<item name="android:actionBarSize">0dp</item>

或

var activity = (Activity)Forms.Context;
this.Window.AddFlags(WindowManagerFlags.Fullscreen);

或

RequestWindowFeature(WindowFeatures.NoTitle);

或在活动字符串中

Theme = "@style/MainTheme.FullScreen"

但我找不到任何可行的解决方案，或者更确切地说，删除了歌词、电池时间等，但我仍然保持顶部栏不变，我怎样才能完全删除它？

在我添加的 iO 上：

UIApplication.SharedApplication.SetStatusBarHidden(true, true);

并且可以工作...但是 android 他让我该死 :) 解决方案？

我使用 xamarin 表单 pcl

我的样式.xaml

    <?xml version="1.0" encoding="utf-8" ?>
<resources>
  <style name="MainTheme" parent="MainTheme.Base">
  </style>
  <!-- Base theme applied no matter what API -->
  <style name="MainTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
    <!--If you are using revision 22.1 please use just windowNoTitle. Without android:-->
    <item name="windowNoTitle">true</item>
    <!--We will be using the toolbar so no need to show ActionBar-->
    <item name="windowActionBar">false</item>
    <!-- Set theme colors from http://www.google.com/design/spec/style/color.html#color-color-palette -->
    <!-- colorPrimary is used for the default action bar background -->
    <item name="colorPrimary">#2196F3</item>
    <!-- colorPrimaryDark is used for the status bar -->
    <!--<item name="colorPrimaryDark">#0084CA</item>-->
    <!-- colorAccent is used as the default value for colorControlActivated
         which is used to tint widgets -->
    <item name="colorAccent">#2196F3</item>
    <!-- You can also set colorControlNormal, colorControlActivated
         colorControlHighlight and colorSwitchThumbNormal. -->
    <item name="windowActionModeOverlay">true</item>
    <!-- default -->
    <item name="android:buttonStyle">@style/NoShadowButton</item>

    <item name="android:datePickerDialogTheme">@style/AppCompatDialogStyle</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowFullscreen">true</item>
  </style>

  <style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
    <item name="colorAccent">#2196F3</item>
  </style>
  <style name="NoShadowButton" parent="android:style/Widget.Button">
    <item name="android:stateListAnimator">@null</item>
  </style>
</resources>

【问题讨论】：

您是否尝试将其添加到您的活动中？ [Activity (Label = "@string/app_name", MainLauncher = true, Theme = "@android:style/Theme.Black.NoTitleBar.Fullscreen")]
是但不起作用，顶栏没有隐藏

标签： c# xamarin xamarin.android xamarin.forms portable-class-library

【解决方案1】：

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    protected override void OnCreate(Bundle bundle)
    {

    this.Window.AddFlags(WindowManagerFlags.Fullscreen | WindowManagerFlags.TurnScreenOn);
        if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
        {
            var stBarHeight = typeof(FormsAppCompatActivity).GetField("statusBarHeight", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
            if (stBarHeight == null)
            {
                stBarHeight = typeof(FormsAppCompatActivity).GetField("_statusBarHeight", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
            }
            stBarHeight?.SetValue(this, 0);
        }
        base.OnCreate(bundle);


        global::Xamarin.Forms.Forms.Init(this, bundle);

        LoadApplication(new App());
    }
}

【讨论】：

你绝对应该包含一些关于你的代码是做什么的描述。

【解决方案2】：

 if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
 {
     Window.AddFlags(WindowManagerFlags.TranslucentStatus);

     return; 
 }

仅此一项并没有将视图置于状态栏下方，而是消除了状态栏下方的黑色空间（高度为 20px 左右）。

【讨论】：

【解决方案3】：

我在 Xamarin 论坛中回答了这个类似的问题：

将这两项添加到您给定活动的主题中：

<item name="android:windowNoTitle">true</item>
<item name="android:windowFullscreen">true</item>

https://forums.xamarin.com/discussion/comment/248555

编辑：为了让您更轻松，请将您的样式更改为 -

<resources>
  <style name="MainTheme.FullScreen" parent="MainTheme.Base">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowFullscreen">true</item>
  </style>
  <style name="MainTheme" parent="MainTheme.Base">
  </style>
  <!-- Base theme applied no matter what API -->
  <style name="MainTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
    <!--If you are using revision 22.1 please use just windowNoTitle. Without android:-->
    <!--We will be using the toolbar so no need to show ActionBar-->
    <item name="windowActionBar">false</item>
    <!-- Set theme colors from http://www.google.com/design/spec/style/color.html#color-color-palette -->
    <!-- colorPrimary is used for the default action bar background -->
    <item name="colorPrimary">#2196F3</item>
    <!-- colorPrimaryDark is used for the status bar -->
    <!--<item name="colorPrimaryDark">#0084CA</item>-->
    <!-- colorAccent is used as the default value for colorControlActivated
     which is used to tint widgets -->
    <item name="colorAccent">#2196F3</item>
    <!-- You can also set colorControlNormal, colorControlActivated
     colorControlHighlight and colorSwitchThumbNormal. -->
    <item name="windowActionModeOverlay">true</item>
    <!-- default -->
    <item name="android:buttonStyle">@style/NoShadowButton</item>

    <item name="android:datePickerDialogTheme">@style/AppCompatDialogStyle</item>
  </style>

  <style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
    <item name="colorAccent">#2196F3</item>
  </style>
  <style name="NoShadowButton" parent="android:style/Widget.Button">
    <item name="android:stateListAnimator">@null</item>
  </style>
</resources>

【讨论】：

这是官方的做法。我们的主题肯定有别的东西搞砸了。你能在你的styles.xml中添加你的完整主题吗？
也许我没有添加官方主题？我如何检查是否添加主题？
你能粘贴你的styles.xml中的内容吗？
什么？我只想看看你的styles.xml。打开你的styles.xml，Ctrl+a，Ctrl+c，回到这里，添加注释，Ctrl+v，回车
找不到与给定名称匹配的资源：attr 'windowFullscreen'。如何添加？抱歉，我是 xamarin 的初学者 :(

【解决方案4】：

在我的情况下，它适用于：

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

  <style name="MainTheme" parent="MainTheme.Base">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowFullscreen">true</item>
  </style>
  <!-- Base theme applied no matter what API -->
  <style name="MainTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
    <!--If you are using revision 22.1 please use just windowNoTitle. Without android:-->
    <item name="windowNoTitle">true</item>
    <!--We will be using the toolbar so no need to show ActionBar-->
    <item name="windowActionBar">false</item>
    <!-- Set theme colors from http://www.google.com/design/spec/style/color.html#color-color-palette -->
    <!-- colorPrimary is used for the default action bar background -->
    <item name="colorPrimary">#2196F3</item>
    <!-- colorPrimaryDark is used for the status bar -->
    <item name="colorPrimaryDark">#1976D2</item>
    <!-- colorAccent is used as the default value for colorControlActivated
         which is used to tint widgets -->
    <item name="colorAccent">#FF4081</item>
    <!-- You can also set colorControlNormal, colorControlActivated
         colorControlHighlight and colorSwitchThumbNormal. -->
    <item name="windowActionModeOverlay">true</item>

    <item name="android:datePickerDialogTheme">@style/AppCompatDialogStyle</item>
  </style>

  <style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
    <item name="colorAccent">#FF4081</item>
  </style>
</resources>

【讨论】：