自定义Tabhost里的TabWidget布局

首先要理解Tabwidget.

TabWidget 理解： 
1. TabWidget 为 horizontal 的 LinearLayout 
2. 且 其包含的标签又是一个RelativeLayout 
3. 每个标签RelativeLayout 里面包含2个View: TextView ImageView

有了这个理解，可以估计得到

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

有了这个布局，就可以自定义自己的布局了，以图片在左，文字在右为例。

 private void addToTabHost(String name, int image, int number) {
     // TODO Auto-generated method stub
     LinearLayout ll = (LinearLayout) mTabHost.getChildAt(0);
     TabWidget tw = (TabWidget) ll.getChildAt(0);
     RelativeLayout rl = (RelativeLayout) tw.getChildAt(number);
     rl.addView(composeLayout(name, image), new LinearLayout.LayoutParams(
             LinearLayout.LayoutParams.FILL_PARENT,
             LinearLayout.LayoutParams.FILL_PARENT));
 }
 private View composeLayout(String name, int image) {
     LinearLayout layout = new LinearLayout(this);
     layout.setGravity(Gravity.CENTER);
     layout.setOrientation(LinearLayout.HORIZONTAL);
     ImageView iv = new ImageView(this);
     iv.setImageResource(image);
     layout.addView(iv, new LinearLayout.LayoutParams(
             LinearLayout.LayoutParams.WRAP_CONTENT,
             LinearLayout.LayoutParams.FILL_PARENT));
     TextView tv = new TextView(this);
     tv.setGravity(Gravity.CENTER);
     tv.setSingleLine(true);
     tv.setPadding(10, 0, 0, 0);
     tv.setTextSize(18);
     tv.setText(name);
     layout.addView(tv, new LinearLayout.LayoutParams(
             LinearLayout.LayoutParams.WRAP_CONTENT,
             LinearLayout.LayoutParams.FILL_PARENT));
     return layout;
 }