android项目中碰到需要替换tabHost默认样式的情况,需要达到下图的效果:
为了做成这样的效果,花了些时间,这里做个笔记,给有需要的朋友。
步骤一:新建一个xml布局文件,命名main.xml
<?
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"
android:background
="@color/white"
>
<
LinearLayout
android:orientation
="vertical"
android:layout_width
="fill_parent"
android:layout_height
="fill_parent"
>
<
TabWidget
android:id
="@android:id/tabs"
android:layout_width
="fill_parent"
android:layout_height
="wrap_content"
android:gravity
="center_horizontal|center_vertical"
/>
<
FrameLayout
android:id
="@android:id/tabcontent"
android:layout_width
="fill_parent"
android:layout_height
="fill_parent"
>
</
FrameLayout
>
</
LinearLayout
>
</
TabHost
>
步骤二:在Activity中添加我们的tab
代码如下
@Override
public
void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTabHost = getTabHost();
Intent intent1 = new Intent(this,OfficialActivity.class);
createTab("公共聊天室",intent1);
Intent intent2 = new Intent(this, NearByActivity.class);
createTab("周边",intent2);
Intent intent3= new Intent(this, HistoryActivity.class);
createTab("历史",intent3);
mTabHost.setCurrentTab(1);
}
private void createTab(String text ,Intent intent){ mTabHost.addTab(mTabHost.newTabSpec(text).setIndicator(createTabView(text)).setContent(intent));
}
private View createTabView(String text) {
View view = LayoutInflater.from(this).inflate(R.layout.tab_indicator, null);
TextView tv = (TextView) view.findViewById(R.id.tv_tab);
tv.setText(text);
return view;
}
步骤三:在createTabView方法中,我们载入了布局文件tab_indicator.xml,改布局很简单,就是放置一个带背景的布局,在布局中放一个textView用于显示tab标题,以下为该布局文件内容
<?
xml
version
="1.0"
encoding
="utf-8"
?>
<
LinearLayout
xmlns:android
="http://schemas.android.com/apk/res/android"
android:layout_height
="fill_parent"
android:layout_width
="fill_parent"
android:orientation
="vertical"
android:gravity
="center"
android:theme
="@android:style/Theme.NoTitleBar"
android:background
="@drawable/chat_tab_selector"
>
<
TextView
android:id
="@+id/tv_tab"
android:layout_width
="wrap_content"
android:layout_height
="wrap_content"
android:text
="tab1"
android:textColor
="@color/white"
/>
</
LinearLayout
>
步骤四:在上面的布局文件中我们把该布局的背景定义为chat_tab_selector,这里同样需要在drawable文件夹下新建chat_tab_selector.xml,内容很简单,就是做一个按下时的背景切换,内容如下:
<?
xml
version
="1.0"
encoding
="utf-8"
?>
<
selector xmlns:android = "http://schemas.android.com/apk/res/android"
>
<
item
android:state_focused = "true"
android:drawable = "@drawable/topbar_bg_down"
/>
<
item
android:state_selected = "true"
android:drawable = "@drawable/topbar_bg_down"
/>
<
item
android:state_pressed = "true"
android:drawable = "@drawable/topbar_bg_down"
/>
<
item android:drawable = "@drawable/topbar_background"
/>
</
selector
>
里面做了两张图进行状态切换,这两张图同样放drawable下就可以了
至此,自定义tab的步骤就完成了。如果要做成更复杂的样式,大家可以在此基础上进行扩展。