ActionBar与Fragment

             最近一个正在学Android的朋友问到了一个ActionBar与Fragment的问题，于是写了一个Demo来简单的说明Fragment与ActionBar的结合。

             要实现诸如WEB开发当中的Tab页切换的效果，可以使用ActionBar来结合Fragment使用。实现思路是在Android页面的头领加上一个ActionBar,其中包含多个TAB元素，每一个Tab元素对应一个Fragemnt,为Tab元素加上TabListener监听事件。这样就可以实现WEB当中的TAB切换的效果了。下面是我写的一个Demo:

             首先新建Fragment并对应的新建连个xml布局文件

             first.xml

<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:id="@+id/first"        android:text="@string/first"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textColor="#ff0000"        android:textSize="25sp"        />  </LinearLayout>

second.xml

<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:id="@+id/second"android:text="@string/second"android:layout_width="match_parent"android:layout_height="wrap_content"android:textColor="#ff0000"android:textSize="25sp"/></LinearLayout>

对应的两个Fragment

FirstFragment

public class FirstFragment extends Fragment {@Overridepublic void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubLog.e(Constant.MESS_LOG, "FirstFragment OnCreate");super.onCreate(savedInstanceState);}@Overridepublic void onStop() {// TODO Auto-generated method stubLog.e(Constant.MESS_LOG, "FirstFragment onStop!");super.onStop();}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stubLog.e(Constant.MESS_LOG, "FirstFratment OnCreateView");return inflater.inflate(R.layout.first, container,false);//super.onCreateView(inflater, container, savedInstanceState);}}

SecondFragment

public class SecondFragment extends Fragment{private Button secondButton;@Overridepublic void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);Log.e(Constant.MESS_LOG, "sECONDfRAGMENT Oncreate");}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stubLog.e(Constant.MESS_LOG, "SecondFragment OnCreateView");return inflater.inflate(R.layout.second, container, false);//super.onCreateView(inflater, container, savedInstanceState);}@Overridepublic void onStop() {// TODO Auto-generated method stubLog.e(Constant.MESS_LOG, "Secondfragment Onstop!");super.onStop();}}

        最后在主页面启动时为其添加一个ActionBar，并将Tab的监听事件加上

public class MainActivity extends Activity implements TabListener{private Fragment fragment;public MainActivity(){}public MainActivity(Fragment fragment){this.fragment = fragment;}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);ActionBar actionBar = getActionBar();actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);actionBar.setDisplayShowTitleEnabled(false);Tab firstTab = actionBar.newTab().setText("First");Tab secondTab = actionBar.newTab().setText("second");firstTab.setTabListener(new MainActivity((new FirstFragment())));secondTab.setTabListener(new MainActivity(new SecondFragment()));actionBar.addTab(secondTab);actionBar.addTab(firstTab);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic void onTabReselected(Tab tab, FragmentTransaction ft) {// TODO Auto-generated method stub}@Overridepublic void onTabSelected(Tab tab, FragmentTransaction ft) {// TODO Auto-generated method stubft.add(R.id.layout, fragment,null);}@Overridepublic void onTabUnselected(Tab tab, FragmentTransaction ft) {// TODO Auto-generated method stubft.remove(fragment);}}

最后注意：

MainActivity  实现了TabListener监听事件所以添加了带参数的构造方法，但是不要往了重载一个无参数的构造方法，否则会报错。

有点困了，今天先写到这里，更详细的内容以后再补上。