使用android:layout_weight解决布局时把按纽压到屏幕外的问题

<? xmlversion="1.0"encoding="utf-8" ?>
< RelativeLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
android:orientation ="vertical" >

< Gallery
android:id ="@+id/gallery"
android:layout_width ="fill_parent"
android:layout_height ="70px"
/>

< GridView
android:id ="@+id/gridview"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
android:columnWidth ="90px"
android:numColumns ="auto_fit"
android:verticalSpacing ="2dp"
android:horizontalSpacing ="2dp"
android:stretchMode ="columnWidth"
android:gravity ="center"

android:layout_below ="@id/gallery"
/>

< LinearLayout
android:id ="@+id/linesexshow"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
android:layout_below ="@id/gallery"
android:orientation ="vertical"
android:visibility ="gone"
>

< ImageView
android:id ="@+id/ivsexshow"
android:layout_width ="fill_parent"
android:layout_height ="0dp"
android:layout_centerHorizontal ="true"
android:visibility ="gone"
android:scaleType ="fitCenter"
android:layout_weight ="100"
/>
< Button
android:id ="@+id/btnback"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
android:text ="@string/btnback"
android:visibility ="gone"
android:layout_centerHorizontal ="true"
android:layout_weight ="1"
/>

</ LinearLayout >
</ RelativeLayout >

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