Android Activity管理类优化内存利器非常方便

来源：互联网发布：家庭智能音乐系统知乎编辑：程序博客网时间：2024/05/16 09:03

项目开启的Activity越多，占的内存越多，我们是不是有时候想当我打开很多界面的时候，我们到底打开多少个Activity，OK现在你的难题解决了，只有把这个Activity管理类复制到你的项目当中，随时随地管理的你的Activity，让你成为内存的主导者！不要问我叫什么，请叫我雷锋！首先看看效果图：

代码献上：

/** * 2014-6-7 上午10:40:16 */package com.jiub.client.mobile.manager;import java.util.Stack;import android.app.Activity;import com.jiub.client.mobile.utils.QLog;/** * @author zqy * *  */public class ScreenManager {private final static String TAG=ScreenManager.class.getSimpleName();   private static Stack<Activity> activityStack;   private static ScreenManager instance;       public static ScreenManager getScreenManager(){        if (instance == null) {            instance = new ScreenManager();        }        QLog.i(TAG, "ScreenManager create");        return instance;            }        /**     * 从栈中移除最后一个元�?     */    public void popActivity(){        Activity activity = currentActivity();        if (activity != null) {            if (!activity.isFinishing()) {                activity.finish();            }            activityStack.removeElement(activity);            activity = null;        }        QLog.i(TAG, "ScreenManager popActivity ");            }        /**     * 从栈中移除指定的元素     * @param activity     */    public void popActivity(Activity activity){        if (activity != null) {        QLog.i(TAG, "要删除"+activity.getClass().getSimpleName());            if (!activity.isFinishing()) {                activity.finish();                QLog.i(TAG, activity.getClass().getSimpleName()+"正在关闭");            }else{            QLog.i(TAG, activity.getClass().getSimpleName()+"已经关闭");            }                        activityStack.removeElement(activity);            QLog.i(TAG, activity.getClass().getSimpleName()+"从栈中移除");            activity = null;        }                int size=activityStack.size();        QLog.i(TAG, "删除后个数"+size);    }    /**     * 将新元素添加到栈中     * @param activity     */    public void pushActivity(Activity activity){        if (activityStack == null) {            activityStack = new Stack<Activity>();        }        activityStack.addElement(activity);                QLog.i(TAG, "加入"+activity.getClass().getSimpleName());        int size=activityStack.size();        QLog.i(TAG, "添加后个数"+size);    }        /**     * 获取栈顶元素     * @return     */    public Activity currentActivity(){        Activity activity = null;        try {            activity = activityStack.lastElement();        } catch (Exception e) {        }        return activity;    }        /**     * 移除全部元素，除了指定类型的以外     * @param cls     */    public void popAllActivityExceptOne(Class<?> cls){        int size = activityStack.size();        for (int i = 0; i < size; i++) {            Activity activity = activityStack.get(i);            if (activity != null && activity.getClass().equals(cls)) {            }else{                popActivity(activity);                size--;                i--;            }        }    }            /**     * 按照给定的Class，结束一个Activity     * @param cls     */    public void finishActivityByClass(Class<?> cls){        int size = activityStack.size();        for (int i = 0; i < size; i++) {            Activity activity = activityStack.get(i);            if (activity != null && activity.getClass().equals(cls)) {                popActivity(activity);                size--;                i--;            }        }    }    }

最后在Activity onCreate方法中写上三行的代码：

protected ScreenManager mScreenManager;//初始化

mScreenManager = ScreenManager.getScreenManager();mScreenManager.pushActivity(this);

在Activity的onDestroy方法里面写上这行代码

mScreenManager.popActivity(this);

但是那如果你有BaseActivity就不需要在每个Activity里面写了，把上面的四行代码写在BaseActivity里面就行了

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