使用设计支持库时如何以编程方式启用/禁用工具栏滚动 [英] How to enable/disable toolbar scrolling programmatically when using design support library

问题描述

在片段中滚动recyclerView时，我使用支持设计库来显示/隐藏工具栏，如此处所述 https://github.com/codepath/android_guides/wiki/Handling-Scrolls-with-CoordinatorLayout

I use support design library to show/hide toolbar when scrolling a recyclerView inside a fragment, as mention here https://github.com/codepath/android_guides/wiki/Handling-Scrolls-with-CoordinatorLayout

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/coordinatorLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

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

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:popupTheme="@style/AppTheme.PopupOverlay"
                app:layout_scrollFlags="scroll|enterAlways"/>

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


        <FrameLayout
            android:id="@+id/flContent"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

        <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="@android:drawable/ic_dialog_email" />

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


    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />

</android.support.v4.widget.DrawerLayout>

它可以正常工作，现在我想以编程方式启用/禁用工具栏滚动，因为我使用了片段并且需要为某些片段停止该功能。

It works grate, Now I want to enable/disable toolbar scrolling programmatically because I use fragments and I need to stop this feature for some fragments.

推荐答案

工具栏 AppBarLayout 的子项，从 AppBarLayout LayoutParams >。这些布局参数具有在XML中设置的滚动标志。

The Toolbar, being a child of the AppBarLayout, gets its LayoutParams from the AppBarLayout. These layout params have the scroll flags that are set in the XML.

因此，您将获得 AppBarLayout.LayoutParams 从工具栏，然后调用
setScrollFlags（）将标志更改为所需的值。

So, you get the AppBarLayout.LayoutParams from the Toolbar, and call setScrollFlags() to change the flags to the value you want.

    Toolbar toolbar = findViewById(R.id.toolbar);  // or however you need to do it for your code
    AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) toolbar.getLayoutParams();
    params.setScrollFlags(0);  // clear all scroll flags

这篇关于使用设计支持库时如何以编程方式启用/禁用工具栏滚动的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！