ActionBar详解(五)--->利用ActionBar结合Fragment实现Tab导航

package cc.testsimpleactionbar4;

import android.os.Bundle;
import android.app.ActionBar;
import android.app.Activity;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.FragmentTransaction;
/**
* Demo描述:
* 利用ActionBar结合Fragment实现Tab导航.
* 当选中不同的Tab时利用Fragment显示不同的内容
*
* 参考资料:
* 1 Android疯狂讲义(第二版)
*   Thank you very much
*
*/
public class MainActivity extends Activity {
private ActionBar mActionBar;
private final static String SELECTED_TAB_INDEX="selected_tab";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initActionBar();
}

private void initActionBar(){
mActionBar=getActionBar();
//设置导航方式为Tab
mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

Tab tab1=mActionBar.newTab();
tab1.setText("第一页");
tab1.setTabListener(new TabListenerImpl());
mActionBar.addTab(tab1);

Tab tab2=mActionBar.newTab();
tab2.setText("第二页");
tab2.setTabListener(new TabListenerImpl());
mActionBar.addTab(tab2);

Tab tab3=mActionBar.newTab();
tab3.setText("第三页");
tab3.setTabListener(new TabListenerImpl());
mActionBar.addTab(tab3);
}

private class TabListenerImpl implements TabListener{
@Override
public void onTabReselected(Tab arg0, FragmentTransaction arg1) {

}

@Override
public void onTabSelected(Tab tab, FragmentTransaction transaction) {
System.out.println(" onTabSelected ");
TestFragment testFragment=new TestFragment();
Bundle bundle=new Bundle();
bundle.putString(TestFragment.KEY, "这是第"+(tab.getPosition()+1)+"个Tab");
testFragment.setArguments(bundle);
FragmentTransaction fragmentTransaction=getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.relativeLayoutContainer, testFragment);
fragmentTransaction.commit();
}

@Override
public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {

}

}

//以下处理横竖屏的切换

//将当前选中的Tab页的索引保存到Bundle中
@Override
protected void onSaveInstanceState(Bundle bundle) {
super.onSaveInstanceState(bundle);
bundle.putInt(SELECTED_TAB_INDEX, mActionBar.getSelectedNavigationIndex());
}

//获取已经保存的被选中Tab页的索引,且设置ActionBar.
//setSelectedNavigationItem()方法会调用onTabSelected()
@Override
protected void onRestoreInstanceState(Bundle bundle) {
super.onRestoreInstanceState(bundle);
mActionBar.setSelectedNavigationItem(bundle.getInt(SELECTED_TAB_INDEX));
}

}

package cc.testsimpleactionbar4;

import android.app.Fragment;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class TestFragment extends Fragment {
public static final String KEY="key";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
TextView textView=new TextView(getActivity());
textView.setGravity(Gravity.CENTER);
Bundle bundle=this.getArguments();
String content=bundle.getString(KEY);
textView.setText(content);
textView.setTextSize(30);
return textView;
}
}

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/relativeLayoutContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
>

</RelativeLayout>