有些事情做多了就有了通用方法，对于android中activity的管理总结，基本逻辑：用Stack（堆栈）管理activity实例，在堆栈里添加，结束，，获取Activity，到程序退出时结束所有activity非常方便。
实现与优化，一个应用程序Activity管理类：AppManager。一个应用程序Activity的基类Baseactivity继承activity，生命周期函数里面调用APPManager的方法。以后所有的activity都可以继承Baseactivity。
代码：AppManager
package net.oschina.app;import java.util.Stack;import android.app.Activity;import android.app.ActivityManager;import android.content.Context;/** * 应用程序Activity管理类：用于Activity管理和应用程序退出 * @version 1.0 */public class AppManager {private static Stack<Activity> activityStack;private static AppManager instance;private AppManager(){}/** * 单一实例 */public static AppManager getAppManager(){if(instance==null){instance=new AppManager();}return instance;}/** * 添加Activity到堆栈 */public void addActivity(Activity activity){if(activityStack==null){activityStack=new Stack<Activity>();}activityStack.add(activity);}/** * 获取当前Activity（堆栈中最后一个压入的） */public Activity currentActivity(){Activity activity=activityStack.lastElement();return activity;}/** * 结束当前Activity（堆栈中最后一个压入的） */public void finishActivity(){Activity activity=activityStack.lastElement();finishActivity(activity);}/** * 结束指定的Activity */public void finishActivity(Activity activity){if(activity!=null){activityStack.remove(activity);activity.finish();activity=null;}}/** * 结束指定类名的Activity */public void finishActivity(Class<?> cls){for (Activity activity : activityStack) {if(activity.getClass().equals(cls) ){finishActivity(activity);}}}/** * 结束所有Activity */public void finishAllActivity(){for (int i = 0, size = activityStack.size(); i < size; i++){if (null != activityStack.get(i)){activityStack.get(i).finish();}}activityStack.clear();}/** * 退出应用程序 */public void AppExit(Context context) {try {finishAllActivity();ActivityManager activityMgr= (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);activityMgr.restartPackage(context.getPackageName());System.exit(0);} catch (Exception e) {}}}BaseActivity：
package net.oschina.app.ui;import net.oschina.app.AppManager;import android.app.Activity;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;/** * 应用程序Activity的基类 * * @version 1.0 * @created 2012-9-18 */public class BaseActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);allowFullScreen = true;// 添加Activity到堆栈AppManager.getAppManager().addActivity(this);}@Overrideprotected void onDestroy() {super.onDestroy();// 结束Activity&从堆栈中移除AppManager.getAppManager().finishActivity(this);}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK && view != null) {view.onKeyDown(keyCode, event);if (!allowDestroy) {return false;}}return super.onKeyDown(keyCode, event);}}
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