本文只要讲解：

（1）ActivityGroup中的activity切换动画

ActivityGroup中有一堆activity，我们可以很轻松的设置前进动画，和返回动画。

（2）ActivityGroup向任意一个子activity传送消息

比如，我们在一个子activity使用了startActivityForResult，那么返回时，调用的是activityGroup对象的onActivityResult方法，而不是这个子activity的onActivityResult方法，

所以我们就必须让activityGroup在onActivityResult中将消息传给那个子activity。

（1）切换动画

采用viewAnimator

1、设置进入和出来动画：

viewAnimator.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.in_from_right));
viewAnimator.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.out_to_left));

2、显示前一个页面和后一个页面：

	viewAnimator.showNext();viewAnimator.showPrevious();

3、页面前进方法:

class1 ： 前进要打开的activity类

bundle ： 参数传递

activityString ： 要打开的activity的字符标记，方便activityGroup定位

public void gotoActivity(Bundle bundle, Class<?> class1, String activityString) {Intent intent = new Intent(this, class1).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);intent.putExtras(bundle);Window w = getLocalActivityManager().startActivity(activityString, intent);currentActivityString.add(activityString);viewAnimator.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.in_from_right));viewAnimator.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.out_to_left));View view = w.getDecorView();history.add(view);viewAnimator.addView(view);viewAnimator.showNext();group.setContentView(viewAnimator);}

4、页面返回方法：

动画设置类似

public void onBackPressedAction() {if (history.size() > 1) {viewAnimator.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.in_from_left));viewAnimator.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.out_to_right));viewAnimator.showPrevious();viewAnimator.removeView(history.get(history.size() - 1));currentActivityString.remove(currentActivityString.size() - 1);history.remove(history.size() - 1);history.get(history.size() - 1).clearFocus();group.setContentView(viewAnimator);} else {showDialog(DIALOG_APP_EXIT);}}

group ： activitygroup对象

history ： 作为一个页面浏览历史记录，以一个堆栈的形式维护。堆顶便是当前activity的view。
（2）传送消息

如果我们用

group.getLocalActivityManager().getCurrentActivity()

获取到的不是我们当前显示的页面，是group中最后打开的那个activity。

如果 ：

我们从A -> B -> C -> D 

在返回 -> C的时候

得到的是D，而不是C。怎么才能获取当前显示的activity呢，

我设置了一个堆栈变量

    /** the getCurrentActivity method returns the last Activity* * this field is used for get currently displayed activity*/public List<String> currentActivityString = new ArrayList<String>();

在页面前进和后退中修改他的值，获取当前activity的方法：

@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == 0) {switch (resultCode) {case RESULT_OK:String string = currentActivityString.get(currentActivityString.size() - 1);if (string == "Jingxuan")((Jingxuan) getLocalActivityManager().getActivity("Jingxuan")).onActivityResult(requestCode,resultCode, data);break;}}}

这样就在activityGroup对象的onActivityResult方法中将消息传给那个子activity。

MyActivityGroup.java 整个代码如下：

import java.util.ArrayList;
import java.util.List;import android.app.ActivityGroup;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.animation.AnimationUtils;
import android.widget.ViewAnimator;public class MyActivityGroup extends ActivityGroup {public MyActivityGroup group = null;/** the getCurrentActivity method returns the last Activity* * this field is used for get currently displayed activity*/public List<String> currentActivityString = new ArrayList<String>();public ArrayList<View> history = null;/*** 页面切换的动画*/public ViewAnimator viewAnimator = null;public final int DIALOG_APP_EXIT = 0;public void onCreate(Bundle savedInstanceState) {history = new ArrayList<View>();viewAnimator = new ViewAnimator(this);group = this;super.onCreate(savedInstanceState);}public void gotoActivity(Bundle bundle, Class<?> class1, String activityString) {Intent intent = new Intent(this, class1).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);intent.putExtras(bundle);Window w = getLocalActivityManager().startActivity(activityString, intent);currentActivityString.add(activityString);viewAnimator.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.in_from_right));viewAnimator.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.out_to_left));View view = w.getDecorView();history.add(view);viewAnimator.addView(view);viewAnimator.showNext();group.setContentView(viewAnimator);}/*** 将事件传给子activity*/@Overridepublic void onBackPressed() {getLocalActivityManager().getActivity(currentActivityString.get(currentActivityString.size() - 1)).onBackPressed();}public void onBackPressedAction() {if (history.size() > 1) {viewAnimator.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.in_from_left));viewAnimator.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.out_to_right));viewAnimator.showPrevious();viewAnimator.removeView(history.get(history.size() - 1));currentActivityString.remove(currentActivityString.size() - 1);history.remove(history.size() - 1);history.get(history.size() - 1).clearFocus();group.setContentView(viewAnimator);} else {showDialog(DIALOG_APP_EXIT);}}@Overrideprotected Dialog onCreateDialog(int id) {Dialog dialog = null;switch (id) {case DIALOG_APP_EXIT:dialog = new AlertDialog.Builder(this).setMessage("确定退出?").setTitle("提示").setPositiveButton("确定", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which) {dialog.dismiss();android.os.Process.killProcess(android.os.Process.myPid());finish();}}).setNegativeButton("取消", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which) {dialog.dismiss();}}).create();}return dialog;}
}