Question

如何设置全部的activity使用一个actionbar

Answer 1

<item
android:id="@+id/action_clock"
android:orderInCategory="100"
android:showAsAction="always"
android:title="@string/action_settings"
android:actionLayout="@layout/clock"/>

</menu>
2、在写一个时钟的布局文件，clock.xml：
[html] view plain copy
<?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" >

<AnalogClock
android:id="@+id/analogClock1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</LinearLayout>
3、在定义一个布局文件用来存放Fragment的布局，列出其中一个，fragment_1.xml：
[html] view plain copy
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<ImageView
android:id="@+id/imageview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitCenter"
android:src="@drawable/xianjian01" >
</ImageView>

</LinearLayout>
4、定义一个类实现ActionBar.TabListener的接口，在这个实现中，每个Tab选项标签都使用了它自己的监听器，MyTabListener.Java：
[java] view plain copy
package com.yangyu.myactionbar02;

import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;

public class MyTabListener<T extends Fragment> implements TabListener {
private Fragment fragment;

private final Activity mActivity;

private final Class<T> mClass;

public MyTabListener(Activity activity, Class<T> clz){
mActivity = activity;

mClass = clz;
}

@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
if(fragment == null){
fragment = Fragment.instantiate(mActivity, mClass.getName());
ft.add(android.R.id.content, fragment, null);
}
ft.attach(fragment);
}

@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (fragment != null) {
ft.detach(fragment);
}
}

@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {

}
}