TabHost两种实现方式

第一种：继承TabActivity，从TabActivity中用getTabHost()方法获取TabHost。只要定义具体Tab内容布局就行了. 

xml布局： 

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent">
    <LinearLayout android:id="@+id/widget_layout_Blue"
        android:layout_width="fill_parent" android:layout_height="fill_parent"
        android:orientation="vertical" >
        <EditText android:id="@+id/widget34" android:layout_width="fill_parent"
            android:layout_height="wrap_content" android:text="EditText"
            android:textSize="18sp">
        </EditText>
        <Button android:id="@+id/widget30" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Button">
        </Button>
    </LinearLayout>
    <LinearLayout android:id="@+id/widget_layout_red"
        android:layout_width="fill_parent" android:layout_height="fill_parent"
        android:orientation="vertical"  >
        <AnalogClock android:id="@+id/widget36"
            android:layout_width="wrap_content" android:layout_height="wrap_content">
        </AnalogClock>
    </LinearLayout>
    <LinearLayout android:id="@+id/widget_layout_green"
        android:layout_width="fill_parent" android:layout_height="fill_parent"
        android:orientation="vertical">
        <RadioGroup android:id="@+id/widget43"
            android:layout_width="166px" android:layout_height="98px"
            android:orientation="vertical">
            <RadioButton android:id="@+id/widget44"
                android:layout_width="wrap_content" android:layout_height="wrap_content"
                android:text="RadioButton">
            </RadioButton>
            <RadioButton android:id="@+id/widget45"
                android:layout_width="wrap_content" android:layout_height="wrap_content"
                android:text="RadioButton">
            </RadioButton>
        </RadioGroup>
    </LinearLayout>
</FrameLayout>

java代码：
super.onCreate(savedInstanceState);
        myTabhost=this.getTabHost();
        //get Tabhost
        LayoutInflater.from(this).inflate(R.layout.main, myTabhost.getTabContentView(), true);
        myTabhost.setBackgroundColor(Color.argb(150, 22, 70, 150));

        myTabhost
                .addTab(myTabhost.newTabSpec("One")// make a new Tab
                        .setIndicator("A")
                        // set the Title and Icon
                        .setContent(R.id.widget_layout_Blue));
        // set the layout

        myTabhost
                .addTab(myTabhost.newTabSpec("Two")// make a new Tab
                        .setIndicator("B",
                                getResources().getDrawable(R.drawable.mumule))
                        // set the Title and Icon
                        .setContent(R.id.widget_layout_green));
        // set the layout

        myTabhost
                .addTab(myTabhost.newTabSpec("Three")// make a new Tab
                        .setIndicator("C",
                                getResources().getDrawable(R.drawable.notepad))
                        // set the Title and Icon
                        .setContent(R.id.widget_layout_red));

第二种：不用继承TabActivity，在布局文件中定义TabHost即可，但是TabWidget的id必须是 
@android:id/tabs，FrameLayout的id必须是@android:id/tabcontent。TabHost的id可以自定义. 

xml布局： 

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

            <TabWidget android:id="@android:id/tabs"
              android:orientation="horizontal"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content">
            </TabWidget>

             <FrameLayout android:id="@android:id/tabcontent"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content">
                    <TextView android:id="@+id/view1"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent"/>
                    <TextView android:id="@+id/view2"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent"/>
                    <TextView android:id="@+id/view3"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent"/>
             </FrameLayout>

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

java代码：
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.hometabs);

        TabHost tabHost = (TabHost) findViewById(R.id.tabhost);
        tabHost.setup();
        TabWidget tabWidget = tabHost.getTabWidget();

        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1", getResources().getDrawable(R.drawable.mumule))
                .setContent(R.id.view1));

        tabHost.addTab(tabHost.newTabSpec("tab3")
                .setIndicator("tab3")
                .setContent(R.id.view3));

        tabHost.addTab(tabHost.newTabSpec("tab2")
                .setIndicator("tab2")
                .setContent(R.id.view2));

        final int tabs = tabWidget.getChildCount();
        Log.i(TAG, "***tabWidget.getChildCount() : " + tabs);

        final int tabWidth = 90;
        final int tabHeight = 45;

        for (int i = 0; i < tabs; i++) {
        /*  final View view = tabWidget.getChildAt(i);
            view.getLayoutParams().width = tabWidth;
            view.getLayoutParams().height = tabHeight;
            final TextView tv = (TextView) view.findViewById(android.R.id.title);
            tv.setTextColor(this.getResources().getColorStateList(android.R.color.black));
            MarginLayoutParams tvMLP = (MarginLayoutParams)tv.getLayoutParams();
            tvMLP.bottomMargin = 8;*/
        }
    }