布局问题

Question

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="3dip"
    tools:context=".MainActivity" >    <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="今日概况:" />
        />
    
     <TableLayout 
       android:layout_width="fill_parent"     
       android:layout_height="wrap_content"
       android:stretchColumns="*"
        android:padding="3dip"
        >
    
    <TableRow>
         
   <ImageButton
 android:id="@+id/button1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:src ="@drawable/st0"
/>

   <ImageButton
 android:id="@+id/button2"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:src ="@drawable/st1"

 />  
   </TableRow>
   
      <TableRow>
         
   <ImageButton
 android:id="@+id/button3"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:src ="@drawable/st0"
/>

   <ImageButton
 android:id="@+id/button4"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:src ="@drawable/st1"

 />  
   </TableRow>
    </TableLayout></LinearLayout>上面是我的布局代码
 <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="今日概况:" />
        />
如果这样写，后面4个ImageButton不会显示<TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="今日概况:" />
        />
如果是这样，后面4个ImageButton  可以显示，但跟TextView 是在同一行，怎样可以把4个ImageButton  放到下一行  并且能整体居中   谢谢！

Answer 1

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:padding="3dip"
    tools:context=".MainActivity" >    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="今日概况:" />
    </LinearLayout>    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" 
        android:layout_weight="1">
        <ImageButton
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@drawable/st0" />
        <ImageButton
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@drawable/st1" />
        <ImageButton
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@drawable/st0" />
        <ImageButton
            android:id="@+id/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@drawable/st1" />
    </LinearLayout></LinearLayout>