我们通常会使用系统自带的ActivityManager，但是在有些情况下使用起来不是太简洁。所以会自己来维护一个栈来管理这些activtiy
代码如下：
import java.util.Stack;import android.app.Activity;import android.util.Log;public class ScreenManager{ private static final String TAG = "ScreenManager"; private static Stack<Activity> activityStack; private static ScreenManager instance; /** * <单例方法> * <功能详细描述> * @return 该对象的实例 * @see [类、类#方法、类#成员] */ public static ScreenManager getScreenManager1() { if (instance == null) { instance = new ScreenManager(); } return instance; } /** * <获取当前栈顶Activity> * <功能详细描述> * @return * @see [类、类#方法、类#成员] */ public Activity currentActivity() { if (activityStack == null || activityStack.size() == 0) { return null; } Activity activity = activityStack.lastElement(); Log.e(TAG, "get current activity:" + activity.getClass().getSimpleName()); return activity; } /** * <将Activity入栈> * <功能详细描述> * @param activity * @see [类、类#方法、类#成员] */ public void pushActivity(Activity activity) { if (activityStack == null) { activityStack = new Stack<Activity>(); } Log.e(TAG, "push stack activity:" + activity.getClass().getSimpleName()); activityStack.add(activity); } /** * <退出栈顶Activity> * <功能详细描述> * @param activity * @see [类、类#方法、类#成员] */ public void popActivity(Activity activity) { if (activity != null) { activity.finish(); Log.e(TAG, "remove current activity:" + activity.getClass().getSimpleName()); activityStack.remove(activity); activity = null; } } /** * <退出栈中所有Activity,当前的activity除外> * <功能详细描述> * @param cls * @see [类、类#方法、类#成员] */ public void popAllActivityExceptMain(Class cls) { while(true) { Activity activity = currentActivity(); if (activity == null) { break; } if (activity.getClass().equals(cls)) { break; } popActivity(activity); } }}具体使用：
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ActivityManager am = (ActivityManager)getSystemService(""); am. ScreenManager.getScreenManager().pushActivity(this); } @Override protected void onDestroy() { super.onDestroy(); ScreenManager.getScreenManager().popActivity(this); } /** * <退出系统> * <绑定退出按钮> * @param v * @see [类、类#方法、类#成员] */ public void exitSystem(View v) { ScreenManager.getScreenManager().popAllActivityExceptMain(getClass()); finish(); }