Android Activity 管理 （AppManager）（非原创）

AppManager 类：

/**
* 应用程序Activity管理类：用于Activity管理和应用程序退出
* 
*/
public class AppManager {
    private static Stack<BaseActivity> activityStack;
    private static AppManager instance;
 
    private AppManager() {
    }
 
    /**
     * 单实例 , UI无需考虑多线程同步问题
     */
    public static AppManager getAppManager() {
        if (instance == null) {
            instance = new AppManager();
        }
        return instance;
    }
 
    /**
     * 添加Activity到栈
     */
    public void addActivity(BaseActivity activity) {
        if (activityStack == null) {
            activityStack = new Stack<BaseActivity>();
        }
        activityStack.add(activity);
    }
 
    /**
     * 获取当前Activity（栈顶Activity）
     */
    public BaseActivity currentActivity() {
        if (activityStack == null || activityStack.isEmpty()) {
            return null;
        }
        BaseActivity activity = activityStack.lastElement();
        return activity;
    }
 
    /**
     * 获取当前Activity（栈顶Activity） 没有找到则返回null
     */
    public BaseActivity findActivity(Class<?> cls) {
        BaseActivity activity = null;
        for (BaseActivity aty : activityStack) {
            if (aty.getClass().equals(cls)) {
                activity = aty;
                break;
            }
        }
        return activity;
    }
 
    /**
     * 结束当前Activity（栈顶Activity）
     */
    public void finishActivity() {
        BaseActivity activity = activityStack.lastElement();
        finishActivity(activity);
    }
 
    /**
     * 结束指定的Activity(重载)
     */
    public void finishActivity(Activity activity) {

       if (activity != null) {
           // 为与系统Activity栈保持一致，且考虑到手机设置项里的"不保留活动"选项引起的Activity生命周期调用onDestroy()方法所带来的问题,此处需要作出如下修正
           if(activity.isFinishing()){
               activityStack.remove(activity);
              //activity.finish();
              activity = null;
             }
        }

     }
 
    /**
     * 结束指定的Activity(重载)
     */
    public void finishActivity(Class<?> cls) {
        for (BaseActivity activity : activityStack) {
            if (activity.getClass().equals(cls)) {
                finishActivity(activity);
            }
        }
    }
 
    /**
     * 关闭除了指定activity以外的全部activity 如果cls不存在于栈中，则栈全部清空
     *
     * @param cls
     */
    public void finishOthersActivity(Class<?> cls) {
        for (BaseActivity 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();
    }
 
    /**
     * 应用程序退出
     */
    public void AppExit(Context context) {
        try {
            finishAllActivity();
            ActivityManager activityMgr = (ActivityManager) context
                    .getSystemService(Context.ACTIVITY_SERVICE);
            activityMgr.killBackgroundProcesses(context.getPackageName());
            System.exit(0);
        } catch (Exception e) {
            System.exit(0);
        }
    }
}

使用方法：

  /**
     * 对context进行初始化，并将当前的Activity加入到堆栈中，便于管理
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 添加Activity到堆栈
        AppManager.getAppManager().addActivity(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 结束Activity&从堆栈中移除
        AppManager.getAppManager().finishActivity(this);
    }