做介面開發的兄弟姐妹都知道嚮導框架一般GUI庫都有提供，而android的介面庫中，卻沒有嚮導框架這個東東。
不要驚訝，你要是不相信的話可以到谷歌查詢，我在stackoverflow看到一些提問：如何實現嚮導式的互動，在android中：how to implement a wizard like interaction in android，回答是有兩種方法：
1）使用多個activity，每個page一個activity，上一步或下一步的響應就是切換activity。
2）使用fragment，每個page一個fragment，上一步或下一步的響應就是切換fragment。
如果每個page之間非常獨立，則用第一種方式；否則建議用第二種。

這裡我們介紹使用第二種方式的實現。

1. 實現思路
嚮導是一個fragment activity，使用fragment layout，layout由兩部分組成：頂部的fragment和底部的上一步，下一步按鈕。
上一步，下一步按鈕，切換對應的fragment。
佈局檔案如下：
<?xml version=“1.0” encoding=“utf-8”?>
<RelativeLayout xmlns:android=“http://schemas.android.com/apk/res/android”
android:layout_width=“match_parent”

<FrameLayout
android:id=“@+id/wizard_content”
android:layout_width=“fill_parent”
android:layout_height=“fill_parent” >
</FrameLayout>

<RelativeLayout

                <Button
                 android:id=“@+id/wizard_finish_btn”
                 android:layout_width=“wrap_content”
                 android:layout_height=“wrap_content”
                 android:layout_alignParentBottom=“true”
                 android:layout_alignParentRight=“true”
                 android:text=“Finish” />

                <Button
                 android:id=“@+id/wizard_next_btn”
                 android:layout_width=“wrap_content”
                 android:layout_height=“wrap_content”
                 android:layout_alignParentBottom=“true”
                 android:layout_toLeftOf=“@+id/wizard_finish_btn”
                 android:text=“Next” />

                <Button
                 android:id=“@+id/wizard_previous_btn”
                 android:layout_width=“wrap_content”
                 android:layout_height=“wrap_content”
                 android:layout_alignParentBottom=“true”
                 android:layout_toLeftOf=“@+id/wizard_next_btn”
                 android:text=“Previous” />
        
</RelativeLayout>

</RelativeLayout>

2. 關鍵的類說明

1）WizardActivity
嚮導框架的activity類，是一個抽象類，子類實現其抽象方法：protected abstract List<TabInfo> getPageList();，要求子類返回所有的嚮導頁（page）。
**
* This is the wizard framework.
* We implements wizard like this:
* 1. Wizard is an activity, the activity main UI contains one replacable Fragment and 2 buttons(previous, next).
* 2. When user press previous or next button, current fragment will be replaced.
* The sub class should implements:
* 1. Implements hasNext() method to tell the framework whether there are next page or not, if no next page, the next button will change to finish button.
* 2. Provide wizard data, the wizard data is a Map, the Map key is the page identifier(e.g name) and the value is the fragment resource id.
* 3. Implements the doPrevious(), doNext(), doFinish(), init() methods.
* @since 2012–11–15
*
*/
public abstract class WizardActivity extends FragmentActivity implements WizardOperation{

2）TabFragment
實現Fragment的子類，在其onCreateView函式中，會初始化所有的介面動作
public class TabFragment extends Fragment{
…
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
…
                View v = inflater.inflate(layoutResource, container, false);
                Bundle args = this.getArguments();
                String action_factory_class = args.getString(“actionFactoryClassName”);
                String tag = args.getString(“tag”);
                if (action_factory_class == null || “”.equals(action_factory_class)){
                        return v;
                }
                
                //set the UI elements actions
                try {
                        AbstractActionFactory factory = (AbstractActionFactory)Class.forName(action_factory_class).newInstance();
                        factory.setupActions(tag, v, this.getActivity());

3）AbstractActionFactory
初始化介面action的工廠類，每個page裡面的介面元素，使用對應的factory去初始化。
public abstract class AbstractActionFactory {
        //The resource id and view mapping, used for this factory to manange the relationship.
        private static Map<String, AbstractActionFactory> factories = new HashMap<String, AbstractActionFactory>();
        
        public abstract void setupActions(String tag, View view, Activity activity);
        
        public static AbstractActionFactory getActionFactory(Class<?> factoryClass){

…
/**
* The UI actions of task. All class in this package is acted as the Control role.
* @since 2012–11–6
*
*/
public class CreateTaskActionFactory extends AbstractActionFactory{

        @Override
        public void setupActions(String tag, View view, Activity activity) {
                //setup the new task action
                Button new_btn = (Button)view.findViewById(R.id.task_panel_new_btn);
                new_btn.setOnClickListener(new OperateActivity.NewTaskAction(activity));
        }

4）TaskCreationActivity
嚮導實現類，實現上一步，下一步的響應，以及提供page list
public class TaskCreationActivity extends WizardActivity{

3. 效果圖