TabHost说明

  TabHost是一个标签窗口的容器。

  一个TabHost对象包含两个子元素对象:

  一个对象是tab标签集合(TabWidget),用户点击它们来选择一个特定的标签;

  另一个是FrameLayout对象,展示当前页的内容

  子元素通常是通过容器对象来控制,而不是直接设置子元素的值。

  下面结合ApiDemos中的例子来说明TabHost的用法。

1、使用的TabActivity

package com.meng.hellotab;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.widget.TabHost;
import android.app.TabActivity;

@SuppressWarnings("deprecation")
public class HelloTabActivity extends TabActivity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        // 得到TabActivity中的TabHost对象
        TabHost tabHost = getTabHost();

        // 内容:采用布局文件中的布局
        LayoutInflater.from(this).inflate(R.layout.activity_hello_tab,
                tabHost.getTabContentView(), true);

        // 加上标签
        // 参数设置:新增的TabSpec的标签,标签中显示的字样
        // setContent设置内容对应的View资源标号
        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1 indicator").setContent(R.id.view1));
        tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab2")
                .setContent(R.id.view2));
        tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab3")
                .setContent(R.id.view3));
    }

}
布局文件1

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/view1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/blue"
        android:text="@string/tab1" />

    <TextView
        android:id="@+id/view2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/red"

        android:text="@string/tab2" />

    <TextView
        android:id="@+id/view3"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/green"
        android:text="@string/tab3" />

</FrameLayout>
colors.xml

颜色文件:
<?xml version="1.0" encoding="utf-8"?>
<resources>

    <drawable name="red">#7f00</drawable>
    <drawable name="blue">#770000ff</drawable>
    <drawable name="green">#7700ff00</drawable>
    <drawable name="yellow">#77ffff00</drawable>
    <drawable name="screen_background_black">#ff000000</drawable>
    <drawable name="translucent_background">#e0000000</drawable>
    <drawable name="transparent_background">#00000000</drawable>

    <color name="solid_red">#f00</color>
    <color name="solid_blue">#0000ff</color>
    <color name="solid_green">#f0f0</color>
    <color name="solid_yellow">#ffffff00</color>

</resources>

第二个程序:使用TabHost.TabContentFactory

package com.meng.hellotab;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TabHost;
import android.widget.TextView;
import android.app.TabActivity;

@SuppressWarnings("deprecation")
public class HelloTabActivity extends TabActivity implements
        TabHost.TabContentFactory
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        TabHost tabHost = getTabHost();

        // 不再需要载入布局文件,如果此句不注释掉会导致content的重叠
        // LayoutInflater.from(this).inflate(R.layout.activity_hello_tab,
        // tabHost.getTabContentView(), true);

        // setContent中传递this
        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1 indicator").setContent(this));
        tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab2")
                .setContent(this));
        tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab3")
                .setContent(this));
    }

    // setContent的参数设为this时,从这个方法得到每一个Tab的内容(此次不用布局文件,用的话会重叠)
    @Override
    public View createTabContent(String tag)
    {
        // 参数: 这个方法会接受到被选择的tag的标签

        final TextView tv = new TextView(this);
        tv.setText("Content for tab with tag " + tag);
        return tv;
    }

}

第三个程序:不继承TabActivity

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <!-- TabHost必须包含一个 TabWidget和一个FrameLayout -->

    <TabHost
        android:id="@+id/myTabHost"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical" >

            <!-- TabWidget的id属性必须为 @android:id/tabs -->

            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="0"
                android:orientation="horizontal" />

            <!-- FrameLayout的id属性必须为 @android:id/tabcontent -->

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="0" >

                <TextView
                    android:id="@+id/view1"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:text="Tab1 Content" />

                <TextView
                    android:id="@+id/view2"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:text="Tab2 Content" />

                <TextView
                    android:id="@+id/view3"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:text="Tab3 Content" />
            </FrameLayout>
        </LinearLayout>
    </TabHost>

</LinearLayout>
package com.meng.hellotabhost;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TabHost;

public class HelloTabHostActivity extends Activity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hello_tab_host);

        TabHost tabHost = (TabHost) findViewById(R.id.myTabHost);

        // 如果不是继承TabActivity,则必须在得到tabHost之后,添加标签之前调用tabHost.setup()
        tabHost.setup();

        // 这里content的设置采用了布局文件中的view
        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1 indicator").setContent(R.id.view1));
        tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab2")
                .setContent(R.id.view2));
        tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab3")
                .setContent(R.id.view3));
    }

}

第四个程序:scrolling Tab

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TabHost
        android:id="@+id/myTabHost"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:padding="5dp" >

            <HorizontalScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:scrollbars="none" >

                <TabWidget

                    android:id="@android:id/tabs"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />
            </HorizontalScrollView>

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:padding="5dp" />
        </LinearLayout>
    </TabHost>

</LinearLayout>
package com.meng.hellotabscroll;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.TabHost;
import android.widget.TextView;

public class HelloTabScrollActivity extends Activity implements
        TabHost.TabContentFactory
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hello_tab_scroll);

        // 从布局中获取TabHost并建立
        TabHost tabHost = (TabHost) findViewById(R.id.myTabHost);
        tabHost.setup();

        // 加上30个标签
        for (int i = 1; i <= 30; i++)
        {
            String name = "Tab " + i;
            tabHost.addTab(tabHost.newTabSpec(name).setIndicator(name)
                    .setContent(this));
        }

    }

    @Override
    public View createTabContent(String tag)
    {
        final TextView tv = new TextView(this);
        tv.setText("Content for tab with tag " + tag);
        return tv;
    }

}

 

posted @ 2014-03-20 08:38  blackBox  阅读(338)  评论(0编辑  收藏  举报