Tab在动作栏中的使用

在activity_main.xml中增加一个FrameLayout，用来显示Fragment内容：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
	android:orientation="vertical"
	android:baselineAligned="false" >

    <FrameLayout android:id="@+id/frameLayout"
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_weight="1">
    </FrameLayout>
    
    <LinearLayout android:layout_width="match_parent"
        android:layout_weight="1"
        android:layout_height="0dip"
        >
        <Button android:id="@+id/add_tab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="增加选项卡"
            android:textSize="20dp"/>
        <Button android:id="@+id/remove_tab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="删除选项卡"
            android:textSize="20dp"/>
    </LinearLayout>

</LinearLayout>

创建tab_content.xml，

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/content"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:textSize="20dp">
    

</TextView>

ActionBarTabsActivity.java中，内容类MyTabListener用于处理选项卡相关事件，内容TabContentFragment用于实现自定义的Fragment:

package com.example.demotab;

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;


public class ActionBarTabsActivity extends Activity {
	
	static int G = 0;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		final ActionBar bar = getActionBar();
		bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);;
		Button addTab = (Button)findViewById(R.id.add_tab);
		addTab.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View view) {

				String title="选项卡:"+bar.getTabCount();
				Tab tab = bar.newTab();
				tab.setText(title);
				tab.setTabListener(new MyTabListener(new TabContentFragment()));
				bar.addTab(tab);
			}
		});
		
		Button removeTab = (Button)findViewById(R.id.remove_tab);
		removeTab.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View view) {

				if(bar.getTabCount()>0){
					bar.removeTabAt(bar.getTabCount()-1);
				}else{
					Toast.makeText(ActionBarTabsActivity.this, "已无Tab可删",Toast.LENGTH_LONG).show();
				}
				
			}
		});
	}



	private class MyTabListener implements TabListener{
		private TabContentFragment fragment;
		public MyTabListener(TabContentFragment fragment){
			this.fragment = fragment;
		}
		
		public void onTabReselected(Tab tab,FragmentTransaction ft){
			
		}
		
		//处理选择选项卡的事件，增加Fragment
		public void onTabSelected(Tab tab,FragmentTransaction ft){
			ft.add(R.id.frameLayout, fragment);
		}
		
		//处理不选择选项卡的事件，移除Fragment
		public void onTabUnselected(Tab tab,FragmentTransaction ft){
			ft.remove(fragment);
		}
	}
	
	
	public static class TabContentFragment extends Fragment{
		
		public TabContentFragment(){
			super();
		}
		
		
		@Override
		public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
			View fragView = inflater.inflate(R.layout.tab_content, container,false);
			TextView text = (TextView)fragView.findViewById(R.id.content);
			
			text.setText("TextTab"+ActionBarTabsActivity.G++);
			return fragView;
		}
	}

}