我想要这样:一个由2个箭头覆盖的ViewPager
我得到了我想要的代码。但是,我收到了lint的警告:
我想知道是否有更好的方法来获得我想要的UI。
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.view.ViewPager
android:id="@+id/dialog_instruction_pager"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</android.support.v4.view.ViewPager>
<!-- this LinearLayout overlays the ViewPager -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >
<!-- This is just the container for the left and right arrows , it is allocated with only 20% of screen height-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight=".2"
android:orientation="horizontal" >
<!-- I want to align this to the left and set width only 5% of the parent -->
<ImageButton
android:id="@+id/instruction_dialog_left_arrow"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".05"
android:background="?android:attr/selectableItemBackground"
android:scaleType="fitCenter"
android:src="@drawable/arrow_left_grey" />
<!-- This is the dummy layout, standing in the middle of 2 arrows so they can be align to the left and right of the parent -->
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".8" >
</LinearLayout>
<!-- I want to align this to the right and set width only 5% of the parent-->
<ImageButton
android:id="@+id/instruction_dialog_right_arrow"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".05"
android:background="?android:attr/selectableItemBackground"
android:scaleType="fitCenter"
android:src="@drawable/arrow_right_grey" />
</LinearLayout>
</LinearLayout>
P.S:是否有任何布局允许对齐左边,右边,底部(如RelativeLayout),还允许设置宽度,高度为百分比(如LinearLayout中的“weight”属性)?
谢谢!
答案 0 :(得分:2)
试试这个
要避免这种布局没用(对于虚拟布局)你应该android:background="@android:color/transparent"
并在该线性布局中添加虚拟视图,因为布局不应为空。
避免嵌套权重对性能不利添加一个子线性布局。 并在代码中阅读我的评论
并为imageview
添加了父级布局,使图像垂直居中
试试这段代码
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="@+id/dialog_instruction_pager"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></android.support.v4.view.ViewPager>
<!-- this LinearLayout overlays the ViewPager -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<!-- This is just the container for the left and right arrows , it is allocated with only 20% of screen height-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight=".2"
android:orientation="horizontal">
<!--child layout to avoid nested weight with `waighSum` property-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="100">
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="5"
android:gravity="center_vertical"
android:orientation="horizontal">
<!-- I want to align this to the left and set width only 5% of the parent -->
<ImageButton
android:id="@+id/instruction_dialog_left_arrow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/selectableItemBackground"
android:scaleType="fitCenter"
android:src="@drawable/icon_clock" />
</LinearLayout>
<!-- This is the dummy layout, standing in the middle of 2 arrows so they can be align to the left and right of the parent -->
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="90"
android:background="@android:color/transparent">// this line also makes layout usefull
<!-- dummy view becouse layout should not be empty -->
<View
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="5"
android:gravity="center_vertical"
android:orientation="horizontal">
<!-- I want to align this to the right and set width only 5% of the parent-->
<ImageButton
android:id="@+id/instruction_dialog_right_arrow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/selectableItemBackground"
android:scaleType="fitCenter"
android:src="@drawable/icon_clock" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</FrameLayout>
希望它适用于你
答案 1 :(得分:2)
Google推出了名为 android.support.percent
的新API<强> 1)PercentRelativeLayout 强>
<强> 2)PercentFrameLayout 强>
添加编译依赖项,如
compile 'com.android.support:percent:23.1.1'
您可以指定维度百分比,以获得RelativeLayout
和百分比
<android.support.percent.PercentRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<TextView
app:layout_widthPercent="40%"
app:layout_heightPercent="40%"
app:layout_marginTopPercent="15%"
app:layout_marginLeftPercent="15%"/>
</android.support.percent.PercentRelativeLayout/>
答案 2 :(得分:1)
Try the below code and see whether it works,
This code will get the layout what you have attached
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v4.view.ViewPager
android:id="@+id/dialog_instruction_pager"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/theme_blue" >
</android.support.v4.view.ViewPager>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:background="@drawable/ic_launcher" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerInParent="true"
android:background="@drawable/ic_launcher" />
</RelativeLayout>
答案 3 :(得分:0)
尝试使用RelativeLayout,然后将左图像设置为alignParentLeft,将右图像设置为alignParentRight