底部tabhost研究三 (TabWidget ，FrameLayout 在TabHost内。TabWidget 和FrameLayout 平行的关系)

public class MainActivity extends TabActivity {
/** Called when the activity is first created. */
TabHost m_TabHost;
Button upButton;
Button nextButton;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initView();
initTabHost();

TabWidget tabWidget = m_TabHost.getTabWidget();
int count = tabWidget.getChildCount();

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);

// 窗口的宽度
int screenWidth = dm.widthPixels;
Log.i("test", "screenWidth=" + screenWidth);
if (count > 4) {
for (int i = 0; i < count; i++) {
tabWidget.getChildTabViewAt(i).setMinimumWidth(
(screenWidth - 40) / 4);

}
}
}

// 初始化组件
private void initView() {
m_TabHost = getTabHost();
upButton = (Button) findViewById(R.id.up_button);
nextButton = (Button) findViewById(R.id.next_button);
}

// 初始化tabhost，添加tab组件
private void initTabHost() {
m_TabHost.addTab(m_TabHost.newTabSpec(0 + "").setIndicator("TAB_01")
.setContent(new Intent(this,s.class)));
m_TabHost.addTab(m_TabHost.newTabSpec(1 + "").setIndicator("TAB_02")
.setContent(new Intent(this,s.class)));
m_TabHost.addTab(m_TabHost.newTabSpec(2 + "").setIndicator("TAB_03")
.setContent(new Intent(this,s.class)));
m_TabHost.addTab(m_TabHost.newTabSpec(3 + "").setIndicator("TAB_04")
.setContent(new Intent(this,CopyOfs.class)));
m_TabHost.addTab(m_TabHost.newTabSpec(4 + "").setIndicator("TAB_05")
.setContent(new Intent(this,s.class)));
m_TabHost.addTab(m_TabHost.newTabSpec(5 + "").setIndicator("TAB_05")
.setContent(new Intent(this,s.class)));
m_TabHost.addTab(m_TabHost.newTabSpec(6 + "").setIndicator("TAB_05")
.setContent(new Intent(this,s.class)));
m_TabHost.addTab(m_TabHost.newTabSpec(7 + "").setIndicator("TAB_05")
.setContent(new Intent(this,s.class)));
}
}

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<RelativeLayout android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button android:id="@+id/up_button" android:layout_width="20sp"
android:layout_height="wrap_content" android:text="@string/up"
android:layout_alignParentLeft="true" />
<Button android:id="@+id/next_button" android:layout_width="20sp"
android:layout_height="wrap_content" android:text="@string/next"
android:layout_alignParentRight="true" />
<HorizontalScrollView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:fillViewport="true"
android:scrollbars="none" android:layout_toLeftOf="@+id/next_button"
android:layout_toRightOf="@+id/up_button">
<TabWidget android:id="@android:id/tabs"
android:layout_width="fill_parent" android:layout_height="wrap_content" />

</HorizontalScrollView>
</RelativeLayout>
<FrameLayout android:id="@android:id/tabcontent"
android:layout_width="fill_parent" android:layout_height="fill_parent">

</FrameLayout>
</LinearLayout>
</TabHost>