把按钮在屏幕使用的LinearLayout底部? [英] Put buttons at bottom of screen with LinearLayout?
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问题描述
我有以下的code,我怎么让这个的3个按键在底部?
I have the following code, how do I make it so that the 3 buttons are at the bottom?
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="60dp"
android:gravity="center"
android:text="@string/observer"
android:textAppearance="?android:attr/textAppearanceLarge"
tools:context=".asdf"
android:weight="1" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="145dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center"
android:text="1" />
<Button
android:id="@+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="145dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center"
android:text="2" />
<Button
android:id="@+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="145dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center"
android:text="3" />
</LinearLayout>
推荐答案
您需要确保三件事情:
- 您之外的LinearLayout已layout_height =match_parent
- 您内的LinearLayout已layout_weight =1和layout_height =0dp
- 您的TextView已经layout_weight = 0
- 您一套正确的重力在你内心的LinearLayout:安卓重力=中心|底
注意FILL_PARENT并不意味着占用全部可用空间。但是,如果使用layout_height =0dp与layout_weight =1,那么视图会占用全部可用空间(的不能与&QUOT适当布局; FILL_PARENT&QUOT;。)
Notice that fill_parent does not mean "take up all available space". However, if you use layout_height="0dp" with layout_weight="1", then a view will take up all available space (Can't get proper layout with "fill_parent").
下面是一些code我很快就写了使用两个LinearLayouts以类似的方式到你的code。
Here is some code I quickly wrote up that uses two LinearLayouts in a similar fashion to your code.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/db1_root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/cow"
android:layout_weight="0"
android:textAppearance="?android:attr/textAppearanceLarge" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:gravity="center|bottom"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="145dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center"
android:text="1" />
<Button
android:id="@+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="145dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center"
android:text="2" />
<Button
android:id="@+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="145dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center"
android:text="3" />
</LinearLayout>
</LinearLayout>
结果看起来与此类似:
The result looks like similar to this:
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