通过ActivityManager 管理activity

package com.nodepp.smartplug.activity;

import android.app.Activity;
import android.content.Context;
import android.os.*;
import android.os.Process;
import android.util.Log;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.Stack;

/**
 * Created by yuyue on 2016/8/5.
 * 管理activity
 */
public class ActivityManager {
        private static Stack activityStack;
        private static ActivityManager instance;

        private ActivityManager() {
        }

        public static ActivityManager getAppManager() {
            if(instance == null) {
                instance = new ActivityManager();
            }

            return instance;
        }

        public void addActivity(Activity activity) {
            if(activityStack == null) {
                activityStack = new Stack();
            }

            Log.i("appmanager", "******************" + activityStack.size());
            if(activityStack.size() > 0) {
                Activity act = (Activity)activityStack.lastElement();
                Log.i("appmanager", "******************" + act.getClass());
                if(act != null && act.getClass().equals(activity.getClass())) {
                    this.finishLastActivity();
                }
            }

            activityStack.add(activity);
        }

        public Activity currentActivity() {
            Activity activity = (Activity)activityStack.lastElement();
            return activity;
        }

        public void finishActivity() {
            Activity activity = (Activity)activityStack.lastElement();
            this.finishActivity(activity);
        }

        public void finishActivity(Activity activity) {
            if(activity != null) {
                this.removeActivityStack(activity);
                activity.finish();
                activity = null;
            }

        }

        public void removeActivityStack(Activity activity) {
            activityStack.remove(activity);
        }

        public void finishLastActivity() {
            Activity activity = (Activity)activityStack.lastElement();
            if(activity != null) {
                activityStack.remove(activity);
                activity.finish();
                activity = null;
            }

        }

        public void finishActivity(Class cls) {
            Iterator i$ = activityStack.iterator();

            while(i$.hasNext()) {
                Activity activity = (Activity)i$.next();
                if(activity.getClass().equals(cls)) {
                    this.finishActivity(activity);
                }
            }

        }

        public void finishAllActivity() {
            int i = 0;

            for(int size = activityStack.size(); i < size; ++i) {
                if(null != activityStack.get(i)) {
                    ((Activity)activityStack.get(i)).finish();
                }
            }

            activityStack.clear();
        }

        public void AppExit(Context context) {
            try {
                this.finishAllActivity();
                System.exit(0);
                android.os.Process.killProcess(Process.myPid());
            } catch (Exception var3) {
                ;
            }

        }

        public void getActivity(Activity activity) {
            if(activity != null) {
                activityStack.remove(activity);
                activity.finish();
                activity = null;
            }

        }

        public Activity getActivity(Class cls) {
            Iterator i$ = activityStack.iterator();

            Activity activity;
            do {
                if(!i$.hasNext()) {
                    return null;
                }

                activity = (Activity)i$.next();
            } while(!activity.getClass().equals(cls));

            return activity;
        }

        public void goToActivity(Activity activity) {
            int flag = -1;
            ArrayList activities = new ArrayList();
            Iterator i = activityStack.iterator();

            Activity act;
            while(i.hasNext()) {
                act = (Activity)i.next();
                if(flag == 0) {
                    ++flag;
                }

                if(flag > 0) {
                    activities.add(act);
                }

                if(flag == -1 && act.getClass().equals(activity.getClass())) {
                    flag = 0;
                }
            }

            for(int var6 = activities.size() - 1; var6 > -1; --var6) {
                act = (Activity)activities.get(var6);
                activityStack.remove(act);
                act.finish();
                act = null;
            }

        }

        public void goToActivity(Class cls) {
            int flag = -1;
            ArrayList activities = new ArrayList();
            Iterator i = activityStack.iterator();

            Activity act;
            while(i.hasNext()) {
                act = (Activity)i.next();
                Log.i("goToActivity","goToActivity=="+act.getClass());
                if(flag >= 0) {
                    ++flag;
                }

                if(flag > 0) {
                    activities.add(act);
                }

                if(flag == -1) {
                    Log.i("activity.getClass()", act.getClass().toString());
                    if(act.getClass().equals(cls)) {
                        flag = 0;
                    }
                }
            }

            for(int var6 = activities.size() - 1; var6 > -1; --var6) {
                act = (Activity)activities.get(var6);
                Log.i("activity.getClass() => ", act.getClass().toString());
                activityStack.remove(act);
                act.finish();
                act = null;
            }

        }

        public int getActivityCount() {
            return activityStack.size();
        }
    }