Android ActionBar Tabs学习笔记

本例主要实现用Tab切换不同的Fragment，点击View显示or隐藏ActionBar，把ActionBar 设为透明，使界面更加友好，详细代码见资源里的ActionBarTabs。

ActionBar Tab主要用于Fragment之间的切换，其必须要设置ActionBar.TabListener，详细代码如下ActionBarActivity.java：

import android.app.ActionBar;import android.app.Activity;import android.app.FragmentTransaction;import android.app.ActionBar.Tab;import android.os.Bundle;import android.os.CountDownTimer;import android.view.MotionEvent;import android.view.Window;public class ActionBarActivity extends Activity {/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//使ActionBar变得透明requestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);setContentView(R.layout.main);final ActionBar actionBar = getActionBar();actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);// remove the activity title to make space for tabsactionBar.setDisplayShowTitleEnabled(false);AFragment aFragment = new AFragment(); actionBar.addTab(actionBar.newTab().setText("Tab-A")            .setTabListener(new ListenerA(aFragment))); BFragment bFragment = new BFragment(); actionBar.addTab(actionBar.newTab().setText("Tab-B")            .setTabListener(new ListenerB(bFragment)));}//点击显示or隐藏ActionBarpublic boolean onTouchEvent(MotionEvent event){ActionBar bar = getActionBar();switch(event.getAction()){case MotionEvent.ACTION_UP:if(bar.isShowing()) bar.hide();else bar.show();break;default:break;}return true;}private class ListenerA implements ActionBar.TabListener {private AFragment mFragment;// Called to create an instance of the listener when adding a new tabpublic ListenerA(AFragment fragment) {mFragment = fragment;}public void onTabSelected(Tab tab, FragmentTransaction ft) {ft.add(R.id.fragment, mFragment, null);}public void onTabUnselected(Tab tab, FragmentTransaction ft) {ft.remove(mFragment);}public void onTabReselected(Tab tab, FragmentTransaction ft) {// do nothing }}}private class ListenerB implements ActionBar.TabListener {private BFragment mFragment;// Called to create an instance of the listener when adding a new tabpublic ListenerB(BFragment fragment) {mFragment = fragment;}public void onTabSelected(Tab tab, FragmentTransaction ft) {ft.add(R.id.fragment, mFragment, null);}public void onTabUnselected(Tab tab, FragmentTransaction ft) {ft.remove(mFragment);}public void onTabReselected(Tab tab, FragmentTransaction ft) {// do nothing }}}}

其中涉及到两个Fragment，在前面Fragment的笔记中讲过，这里就不再赘述。类AFragment实现如下，BFragment实现与这类似：

public class AFragment extends Fragment {public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        return inflater.inflate(R.layout.alayout, container, false);   }}