新浪微博布局学习——妙用TabHost

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<?xml version="1.0" encoding="UTF-8"?>
<TabHost android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent"
  xmlns:android="http://schemas.android.com/apk/res/android">
    <LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">
        <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="0.0dip" android:layout_weight="1.0" />
        <TabWidget android:id="@android:id/tabs" android:visibility="gone" android:layout_width="fill_parent" android:layout_height="wrap_content"android:layout_weight="0.0" />
        <RadioGroup android:gravity="center_vertical" android:layout_gravity="bottom" android:orientation="horizontal" android:id="@id/main_radio"android:background="@drawable/maintab_toolbar_bg" android:layout_width="fill_parent" android:layout_height="wrap_content">
            <RadioButton   android:text="@string/main_home" android:checked="true" android:id="@+id/radio_button0" android:layout_marginTop="2.0dip"android:drawableTop="@drawable/icon_1_n" style="@style/main_tab_bottom" />
            <RadioButton android:id="@+id/radio_button1" android:layout_marginTop="2.0dip" android:text="@string/main_news"android:drawableTop="@drawable/icon_2_n" style="@style/main_tab_bottom" />
            <RadioButton android:id="@+id/radio_button2" android:layout_marginTop="2.0dip" android:text="@string/main_my_info"android:drawableTop="@drawable/icon_3_n" style="@style/main_tab_bottom" />
            <RadioButton android:id="@+id/radio_button3" android:layout_marginTop="2.0dip" android:text="@string/menu_search"android:drawableTop="@drawable/icon_4_n" style="@style/main_tab_bottom" />
            <RadioButton android:id="@+id/radio_button4" android:layout_marginTop="2.0dip" android:text="@string/more"android:drawableTop="@drawable/icon_5_n" style="@style/main_tab_bottom" />
        </RadioGroup>
    </LinearLayout>
</TabHost>

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<style name="main_tab_bottom">
       <item name="android:textSize">@dimen/bottom_tab_font_size</item>
       <item name="android:textColor">#ffffffff</item>
       <item name="android:ellipsize">marquee</item>
       <item name="android:gravity">center_horizontal</item>
       <item name="android:background">@drawable/home_btn_bg</item>
       <item name="android:paddingTop">@dimen/bottom_tab_padding_up</item>
       <item name="android:layout_width">fill_parent</item>
       <item name="android:layout_height">wrap_content</item>
       <item name="android:button">@null</item>
       <item name="android:singleLine">true</item>
       <item name="android:drawablePadding">@dimen/bottom_tab_padding_drawable</item>
       <item name="android:layout_weight">1.0</item>
</style>
```xml

home_btn_bg.xml

```xml    
<selector
  xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:state_enabled="true" android:state_pressed="false" android:drawable="@drawable/home_btn_bg_s" />
    <item android:state_enabled="true" android:state_pressed="true" android:drawable="@drawable/home_btn_bg_s" />
    <item android:state_enabled="true" android:state_checked="true" android:drawable="@drawable/home_btn_bg_d" />
    <item android:drawable="@drawable/transparent" />
</selector>

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public class MainTabActivity extends TabActivity implements
        OnCheckedChangeListener {

    private TabHost mHost;
    private Intent mMBlogIntent;
    private Intent mMoreIntent;
    private Intent mInfoIntent;
    private Intent mSearchIntent;
    private Intent mUserInfoIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.maintabs);

        // ~~~~~~~~~~~~ 初始化
        this.mMBlogIntent = new Intent(this, HomeListActivity.class);
        this.mSearchIntent = new Intent(this, SearchSquareActivity.class);
        this.mInfoIntent = new Intent(this, MessageGroup.class);
        this.mUserInfoIntent = new Intent(this, MyInfoActivity.class);
        this.mMoreIntent = new Intent(this, MoreItemsActivity.class);

        initRadios();

        setupIntent();
    }

    /**
     * 初始化底部按钮
     */
    private void initRadios() {
         ((RadioButton) findViewById(R.id.radio_button0)).setOnCheckedChangeListener(this);
         ((RadioButton) findViewById(R.id.radio_button1)).setOnCheckedChangeListener(this);
         ((RadioButton) findViewById(R.id.radio_button2)).setOnCheckedChangeListener(this);
         ((RadioButton) findViewById(R.id.radio_button3)).setOnCheckedChangeListener(this);
         ((RadioButton) findViewById(R.id.radio_button4)).setOnCheckedChangeListener(this);
    }

    /**
     * 切换模块
     */
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (isChecked) {
            switch (buttonView.getId()) {
            case R.id.radio_button0:
                this.mHost.setCurrentTabByTag("mblog_tab");
                break;
            case R.id.radio_button1:
                this.mHost.setCurrentTabByTag("message_tab");
                break;
            case R.id.radio_button2:
                this.mHost.setCurrentTabByTag("userinfo_tab");
                break;
            case R.id.radio_button3:
                this.mHost.setCurrentTabByTag("search_tab");
                break;
            case R.id.radio_button4:
                this.mHost.setCurrentTabByTag("more_tab");
                break;
            }
        }
    }

    private void setupIntent() {
        this.mHost = getTabHost();
        TabHost localTabHost = this.mHost;

        localTabHost.addTab(buildTabSpec("mblog_tab", R.string.main_home,
                R.drawable.icon_1_n, this.mMBlogIntent));

        localTabHost.addTab(buildTabSpec("message_tab", R.string.main_news,
                R.drawable.icon_2_n, this.mInfoIntent));

        localTabHost.addTab(buildTabSpec("userinfo_tab", R.string.main_my_info,
                R.drawable.icon_3_n, this.mUserInfoIntent));

        localTabHost.addTab(buildTabSpec("search_tab", R.string.menu_search,
                R.drawable.icon_4_n, this.mSearchIntent));

        localTabHost.addTab(buildTabSpec("more_tab", R.string.more,
                R.drawable.icon_5_n, this.mMoreIntent));

    }

    private TabHost.TabSpec buildTabSpec(String tag, int resLabel, int resIcon,
            final Intent content) {
        return this.mHost
                .newTabSpec(tag)
                .setIndicator(getString(resLabel),
                        getResources().getDrawable(resIcon))
                .setContent(content);
    }
}