为什么我的Android导航抽屉的开口太大? [英] Why is my Android navigation drawer opening too wide?
问题描述
我有一个相当基本的导航抽屉，可以很好地工作-一个简单的ListView.但是我需要在可选项目上方添加一个标题，因此(请参见下文)将抽屉的XML修改为一个RelativeLayout，其中包含用于标题的TextView，然后是用于项目的ListView.
I had a rather basic navigation drawer working pretty well -- a simple ListView. But I need a title above the selectable items, so (see below) modified the XML for the drawer to be a RelativeLayout containing a TextView for a title and then the ListView for the items.
结果是很奇怪的.即使我已将所有3个(RelativeLayout，TextView和ListView)的宽度都指定为240dp，也就是表示整个抽屉XML的ListView的宽度，它看起来像这样(忽略音量控件-没看到弹出).请注意，ListView的宽度为240 dp，但是我分配的红色背景一直一直向右移动.
What resulted is quite strange. Even though I have specified the width for all 3 (RelativeLayout, TextView and ListView) to be 240dp, which was the width of the ListView when it represented the entire drawer's XML, it looks like this (ignore the volume control - didn't see that pop up). Notice the ListView is 240 dp wide, but the red background I've assigned is going all the way to the right.
这是我的第一个屏幕的XML.相关抽屉XML位于底部.
Here's my XML for my first screen. The relevant drawer XML is at bottom.
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- The main content view -->
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@drawable/ail_background_gradient"
tools:context="com.allinlearning.assist_android.HomeScreenActivityFragment">
<ImageView
android:id="@+id/imgViewLogo"
android:src="@drawable/ail_logo"
android:layout_margin="10dp"
android:layout_width="90dp"
android:layout_height="90dp"
android:scaleType="fitXY"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="ALL In Learning"
android:id="@+id/textViewLogo"
android:layout_margin="10dp"
android:layout_below="@+id/imgViewLogo"
android:layout_centerHorizontal="true"
android:textSize="@dimen/font_size26"
android:textStyle="bold" />
<ImageButton
android:id="@+id/imgBtnGradeAssessment"
android:src="@drawable/grade_assessment"
android:layout_width="100dp"
android:layout_height="95dp"
android:scaleType="fitXY"
android:layout_centerVertical="true"
android:layout_toLeftOf="@+id/textViewGradeAssessment"
android:layout_toStartOf="@+id/textViewGradeAssessment" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Grade"
android:id="@+id/textViewGradeAssessment"
android:textColor="@color/white"
android:textSize="@dimen/font_size28"
android:layout_centerVertical="true"
android:layout_alignRight="@+id/imgViewLogo"
android:layout_alignEnd="@+id/imgViewLogo" />
<ImageButton
android:id="@+id/imgBtnPrivateData"
android:src="@drawable/two_clickers"
android:layout_width="100dp"
android:layout_height="95dp"
android:scaleType="fitXY"
android:layout_below="@+id/imgBtnGradeAssessment"
android:layout_alignLeft="@+id/imgBtnGradeAssessment"
android:layout_alignStart="@+id/imgBtnGradeAssessment" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Private Data"
android:id="@+id/textViewPrivateData"
android:textColor="@color/white"
android:textSize="@dimen/font_size28"
android:layout_alignBottom="@+id/imgBtnPrivateData"
android:layout_toRightOf="@+id/imgBtnPrivateData"
android:layout_toEndOf="@+id/imgBtnPrivateData"
android:layout_marginBottom="40dp" />
</RelativeLayout>
<!-- The navigation drawer -->
<LinearLayout android:id="@+id/left_drawer"
android:orientation="vertical"
android:background="@color/red"
android:layout_width="240dp"
android:layout_height="wrap_content">
<TextView
android:layout_width="240dp"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="I AM THE TITLE"
android:id="@+id/tvDrawerTitle"
android:layout_margin="10dp"
android:layout_centerHorizontal="true"
android:textSize="@dimen/font_size26"
android:textStyle="bold"
android:textAlignment="center"
android:textColor="@color/black" />
<ListView
android:id="@+id/lvDrawerItems"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="left"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="@color/white" />
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
推荐答案
layout_gravity属性确定哪个子View充当DrawerLayout中的抽屉.当前，您的DrawerLayout的直接子对象都没有设置该属性，因此两者都只是将其填充，并且顶部的LinearLayout覆盖了内容RelativeLayout.
The layout_gravity attribute determines which child View acts as the drawer in a DrawerLayout. Currently, neither of the direct children of your DrawerLayout has that attribute set, so both are just filling it, with the LinearLayout on top, covering the content RelativeLayout.
将android:layout_gravity="left"从ListView移动到LinearLayout.
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