Eclipse Android XML佈局頁眉和頁腳

Question

嗨！即時通訊嘗試在我的活動頂部獲取一排按鈕，底部的一排按鈕以及兩者之間的webview。頂部和底部的行將被anochored，webview將根據其數據滾動。

我的下面的代碼不太工作。誰能幫我嗎？。此刻，webview坐在兩個按鈕欄下方，爲什麼是這樣？

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

    <LinearLayout 
     android:id="@+id/header" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:orientation="horizontal" > 

     <com.appname.app.SegmentedRadioGroup 
      android:id="@+id/segment_text" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_margin="5dip" 
      android:layout_span="2" 
      android:checkedButton="@+id/button_one" 
      android:orientation="horizontal" > 

      <RadioButton 
       android:id="@id/button_one" 
       android:button="@null" 
       android:gravity="center" 
       android:minHeight="33dip" 
       android:minWidth="40dip" 
       android:text=" Description " 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="@color/radio_colors" /> 

      <RadioButton 
       android:id="@+id/button_two" 
       android:button="@null" 
       android:gravity="center" 
       android:minHeight="33dip" 
       android:minWidth="40dip" 
       android:text=" Images " 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="@color/radio_colors" /> 

      <RadioButton 
       android:id="@+id/button_three" 
       android:button="@null" 
       android:gravity="center" 
       android:minHeight="33dip" 
       android:minWidth="40dip" 
       android:text=" Audio " 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="@color/radio_colors" /> 

      <RadioButton 
       android:id="@+id/button_four" 
       android:button="@null" 
       android:gravity="center" 
       android:minHeight="33dip" 
       android:minWidth="40dip" 
       android:text=" Weblinks " 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="@color/radio_colors" /> 
     </com.appname.app.SegmentedRadioGroup> 
    </LinearLayout> 

    <LinearLayout 
     android:id="@+id/footer" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentBottom="true" 
     android:orientation="horizontal" > 

     <Button 
      android:id="@+id/main_menu_button" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Main Menu" /> 

     <Button 
      android:id="@+id/scan_exhibit" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Scan New Exhibit" /> 
    </LinearLayout> 

    <RelativeLayout 
     android:layout_width="wrap_content" 
     android:layout_height="fill_parent" 
     android:layout_below="@id/header" 
     android:layout_above="@id/footer" > 
     <WebView 
      android:id="@+id/webview1" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:background="#000000" /> 
    </RelativeLayout> 

</LinearLayout> 

Answer 1

即使您的WebView位於RelativeLayout，也不能調用其上的layout_above and layout_below，因爲其他佈局不在同一個RelativeLayout之內。這些選項僅適用於RelativeLayout中的對象。

只需將您的WebView置於其他佈局之間，您甚至不需要爲其分配佈局。

試試這個：

重新editted：如果不使用LinearLayout我把你的整個佈局在RelativeLayout。那麼你的選擇確實有效。試試這個，它似乎適用於我，但我錯過了你的自定義類。

<?xml version="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" > 

    <LinearLayout 
     android:id="@+id/header" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:orientation="horizontal" > 

     <com.appname.app.SegmentedRadioGroup 
      android:id="@+id/segment_text" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_margin="5dip" 
      android:layout_span="2" 
      android:checkedButton="@+id/button_one" 
      android:orientation="horizontal" > 

      <RadioButton 
       android:id="@id/button_one" 
       android:button="@null" 
       android:gravity="center" 
       android:minHeight="33dip" 
       android:minWidth="40dip" 
       android:text=" Description " 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="@color/radio_colors" /> 

      <RadioButton 
       android:id="@+id/button_two" 
       android:button="@null" 
       android:gravity="center" 
       android:minHeight="33dip" 
       android:minWidth="40dip" 
       android:text=" Images " 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="@color/radio_colors" /> 

      <RadioButton 
       android:id="@+id/button_three" 
       android:button="@null" 
       android:gravity="center" 
       android:minHeight="33dip" 
       android:minWidth="40dip" 
       android:text=" Audio " 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="@color/radio_colors" /> 

      <RadioButton 
       android:id="@+id/button_four" 
       android:button="@null" 
       android:gravity="center" 
       android:minHeight="33dip" 
       android:minWidth="40dip" 
       android:text=" Weblinks " 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="@color/radio_colors" /> 
     </com.appname.app.SegmentedRadioGroup> 
    </LinearLayout> 

    <WebView 
     android:id="@+id/webview1" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:layout_above="@+id/footer" 
     android:layout_below="@+id/header" 
     android:background="#000000" /> 

    <LinearLayout 
     android:id="@+id/footer" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentBottom="true" 
     android:orientation="horizontal" > 

     <Button 
      android:id="@+id/main_menu_button" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Main Menu" /> 

     <Button 
      android:id="@+id/scan_exhibit" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Scan New Exhibit" /> 
    </LinearLayout> 

</RelativeLayout> 

Answer 2

這是因爲你的LinearLayout是垂直有三個孩子在另一個，和。嘗試將WebView置於線性佈局代碼 之間。